Roofing materials for renovating existing roofs and construction structures using them

Abstract

To average the flow rate of rainwater in a renovation roofing material that is constructed by covering an existing thin plate-shaped roofing material that is stacked in the direction of eaves in a staircase pattern.SOLUTION: In a renovation roofing material 100, a ridge side insertion portion 130, a decorative surface portion 110, and an eaves side folded portion 120 are integrally formed, and the decorative surface portion 110 is formed with water flow control means. As an example of the water flow control means, a recess is formed in the decorative surface portion 110 along a substantially vertical direction in the eaves building direction. Further, this recess is formed in a bellows-folded shape (repeated shape of mountain folds and valley folds) including at least two slopes, an eaves-side slope and a ridge-side slope. An inclination angle β (deg) of the eaves-side slope is less than a roof gradient α (deg) of the existing roof.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a roofing material for renovating an existing roof and a construction structure using the same, and more particularly to a roofing material for renovation that is constructed to cover a thin plate-shaped existing roofing material that is stacked in a stepped manner in the eaves-ridge direction and a construction structure using the same.

Background Art

[0002] The roofs of buildings such as houses are often constructed by stacking rectangular thin plate roofing materials in a stepped manner in the eaves-ridge direction. In this case, the stepped stacking means that the lower ends of the roofing materials arranged on the upper side (ridge side) in the roof slope direction are sequentially stacked and installed on the upper ends of the roofing materials arranged on the lower side (eaves side) in the roof slope direction. In order to replace the roof covered with such roofing materials, all the existing roofing materials are removed and replaced with new roofing materials. However, this is time-consuming to remove the roofing materials and it is difficult to replace them while the building is in use. For this reason, a renovation roofing material (hereinafter not distinguished in the same meaning as the repair material) is attached to the surface of the existing roofing material to cover the existing roofing material, thereby replacing the roof (such a replacement construction method is also called a cover construction method).

[0003] Japanese Patent Application Laid-Open No. 2001-073506 (Patent Document 1) discloses a renovation roofing material that facilitates such roof replacement work. The renovation roofing material disclosed in this Patent Document 1 is a renovation roofing material provided on the surfaces of a plurality of roofing materials that are continuously arranged along the roof slope direction and in which the lower ends of the roofing materials arranged on the upper side in the slope direction are sequentially stacked and installed on the upper ends of the roofing materials arranged on the lower side in the slope direction, and includes a main body that covers the surface of the roofing material, a clamping portion that sandwiches the end portion on the lower side in the slope direction of the roofing material from the front and back, and a clamped portion that is sandwiched between the roofing material and the roofing material arranged on the upper side in the slope direction of this roofing material.

[0004] According to the roofing material for remodeling disclosed in Patent Document 1, the main body is slid along the surface of the roofing material from the lower side in the direction of the slope to the upper side in the direction of the slope, the clamping portion is sandwiched between the roofing material and the roofing material positioned above it in the direction of the slope, and the clamping portion is fitted into the end face of the roofing material, thereby enabling the remodeling roofing material to be attached to the roofing material. As a result, there is no need to engage the remodeling roofing material with other remodeling roofing materials, making the installation work of the remodeling roofing material easier than in the conventional method. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-073506 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, the roofing material for renovation (remodeling roofing material) disclosed in Patent Document 1, as mentioned above, is composed of a main body that covers the existing slate roofing material, a clamping part that clamps the lower part of the slate roofing material, and a clamped part that is sandwiched between the upper and lower slate roofing materials. These main body, clamping part, and clamped part are formed by bending a single metal plate, and since the main body is formed on a flat surface, when rainwater flows from the ridge to the eaves during rainy weather, the flow rate of rainwater in the direction perpendicular to the ridge-eave direction (left-right direction: girder direction) is not controlled in any way and is left to chance. For this reason, in a roof structure using the roofing material for renovation (remodeling roofing material) disclosed in Patent Document 1, there was a possibility of problems occurring due to a significant bias in the flow rate of rainwater in the left-right direction of the roof, or due to unnatural flow.

[0007] The present invention was developed in view of the above-mentioned problems of the prior art, and its purpose is to provide a roof repair material that is installed to cover existing thin-plate roofing materials that are installed in a stepped manner in the direction of the eaves and ridge, and that can average the flow rate of rainwater in the direction perpendicular to the direction of the eaves and ridge (left-right direction: girder direction), or generate a smooth flow, and to provide a construction structure using the same roof repair material. [Means for solving the problem]

[0008] To achieve the above objective, the roof repair material relating to a certain aspect of the present invention employs the following technical means. In other words, a roof repair material according to a certain aspect of the present invention is a roof repair material for an existing roof in which thin-plate shaped existing roof materials are stacked in a stepped manner in the direction of the eaves and ridge, characterized in that a ridge-side insertion portion, a decorative surface portion, and an eaves-side folded portion are integrally formed, and a water flow control means is formed in the decorative surface portion.

[0009] Furthermore, a roof repair material relating to another aspect of the present invention is a roof repair material for an existing roof in which thin-plate-shaped existing roof materials are installed by overlapping them in a stepped manner in the direction of the eaves and ridge, characterized in that a ridge-side insertion portion, a decorative surface portion, and an eaves-side folded portion are integrally formed, and a recess is formed in the decorative surface portion in a direction substantially perpendicular to the direction of the eaves and ridge. Preferably, the water flow control means or the recess is formed by a bellows fold including at least two slopes, an eave-side slope and a ridge-side slope, and the inclination angle of the eave-side slope can be configured to be less than the roof slope of the existing roof.

[0010] More preferably, a water drainage portion can be formed on the surface side between the decorative surface portion and the eaves-side folded portion. More preferably, the edge of the folded-over portion on the eaves side can be configured to be hemmed toward the back side or the front side. More preferably, the ends of the vertical edges in the eaves-ridge direction can be hemmed toward the back side.

[0011] More preferably, the edge of the ridge-side insertion portion can be configured to be hemmed toward the back or front side. Furthermore, a construction structure for a roof repair material according to yet another aspect of the present invention is a construction structure for a roof repair material for an existing roof in which thin-plate-shaped existing roof materials are stacked in a stepped manner in the direction of the eaves and ridge, wherein the roof repair material is integrally formed with a ridge-side insertion portion, a decorative surface portion, and an eaves-side folded portion, a water flow control means is formed in the decorative surface portion, the edge of the eaves-side folded portion is hemmed, and during construction, the edge of the ridge-side insertion portion is positioned closer to the ridge than the edge of the eaves-side folded portion. [Effects of the Invention]

[0012] According to the present invention, a roof repair material is provided that is installed to cover existing thin-plate roofing materials that are installed in a stepped manner in the direction of the eaves and ridge, and that can average the flow rate of rainwater in the direction perpendicular to the direction of the eaves and ridge (left and right direction), or generate a smooth flow, and a construction structure using the same roof repair material is provided. [Brief explanation of the drawing]

[0013] [Figure 1] This is a partial perspective view of a roof under renovation using the renovation roofing material 100 according to the first embodiment of the present invention. [Figure 2] Figure 1 shows (A) a three-view drawing of the roofing material 100 for renovation and (B) a three-view drawing of the joint cover 150. [Figure 3] This is a plan view of Figure 1. [Figure 4] This is a cross-sectional view in the flow direction of Figure 1. [Figure 5] This is a cross-sectional view in the gable direction of Figure 1. [Figure 6] This is a partial perspective view of a roof under renovation using the renovation roofing material 200 according to a second embodiment of the present invention. [Figure 7](A) Perspective view of the roof material 200 for repair in FIG. 6, (B) Perspective view of the joint discard plate 250 in FIG. 6. [Figure 8] Plan view of FIG. 6. [Figure 9] Cross-sectional view in the flow direction of FIG. 6. [Figure 10] Cross-sectional view in the gable direction of FIG. 6. [Figure 11] Partial perspective view of the roof being repaired using the roof material 300 for repair according to the third embodiment of the present invention. [Figure 12] (A) Perspective view of the roof material 300 for repair in FIG. 11, (B) Perspective view of the joint discard plate 350 in FIG. 11. [Figure 13] Plan view of FIG. 11. [Figure 14] Cross-sectional view in the flow direction of FIG. 11. [Figure 15] Cross-sectional view in the gable direction of FIG. 11. [Figure 16] Partial perspective view of the roof being repaired using the roof material 300 for repair according to the fourth embodiment of the present invention. [Figure 17] (A) Perspective view of the roof material 400 for repair in FIG. 16, (B) Perspective view of the joint discard plate 350 in FIG. 16. [Figure 18] Plan view of FIG. 16. [Figure 19] Cross-sectional view in the flow direction of FIG. 16. [Figure 20] Cross-sectional view in the gable direction of FIG. 16. [Figure 21] Diagram showing a first modification common to the roof materials 100, 200, 300, and 400 for repair. [Figure 22] Diagram showing a second modification common to the roof materials 100 and 200 for repair. [[ID=​​​​​​ [Figure 25] This figure shows a modified example of roofing material 400 for renovation. [Modes for carrying out the invention]

[0014] The following describes in detail, with reference to the drawings, the roofing material for renovation according to an embodiment of the present invention and the construction structure of a roof using this roofing material. Furthermore, although the roofing material for renovation according to the present invention is not limited to the following shape, it is made by bending or otherwise processing a rectangular metal sheet in which the direction perpendicular to the eaves and ridge direction (left-right direction: girder direction) is longer than the direction along the eaves and ridge direction. Then, a first embodiment of a remodeling roofing material 100, in which both ends in the longitudinal direction (direction perpendicular to the eaves and ridge direction (left-right direction: girder direction)) are not hemmed, will be described with reference to Figures 1 to 5. A second embodiment of a remodeling roofing material 200, in which both ends are hemmed, will be described with reference to Figures 6 to 10. A third embodiment of a remodeling roofing material 300, in which both ends are not hemmed and the water flow control means is different from that of the remodeling roofing materials 100 and 200, will be described with reference to Figures 11 to 15. A fourth embodiment of a remodeling roofing material 400, in which both ends are hemmed and the water flow control means is different from that of the remodeling roofing materials 100, 200 and 300, will be described with reference to Figures 16 to 20. After that, modified examples applicable to these embodiments will be described with reference to Figures 21 to 25. As will be explained in more detail later, the water flow control means is common to both the roof repair material 100 according to the first embodiment and the roof repair material 200 according to the second embodiment. The steps are different from the water flow control means for the refurbishment roofing material 300 according to the third embodiment and the water flow control means for the refurbishment roofing material 400 according to the fourth embodiment.

[0015] <First Embodiment> With reference to Figure 1, which shows a perspective view of a roof under renovation using the renovation roofing material 100 according to the first embodiment of the present invention; Figure 2(A), which shows a three-view drawing of the renovation roofing material 100; Figure 2(B), which shows a three-view drawing of a joint cover 150 used together with the renovation roofing material 100; Figure 3, which shows a plan view of Figure 1; Figure 4, which shows a cross-sectional view of Figure 1 in the flow direction; and Figure 5, which shows a cross-sectional view of Figure 1 in the gable direction, the renovation roofing material 100 according to the first embodiment and the construction structure of a roof using this renovation roofing material 100 will be described in detail.

[0016] • Existing roof First, an example of decorative slate 1000 installed on an existing roof to be renovated using this renovation roofing material 100 will be described. This decorative slate 1000 is an existing roofing material, for example, as shown in Figure 1, it is a roofing material used on the roof of a building (including a structure), and is installed on top of the roof underlayment (more specifically, the underlayment material, such as the roof decking boards 1020 and the underlayment 1030, which will be described later). Here, in Figures 1 to 5, not all members related to the roof construction structure are described because they are not directly related to the present invention (for example, eaves flashing, gable flashing, etc. are omitted in some figures). Also, in Figure 1, the decorative slate 1000 is arranged in a staggered pattern (the renovation roofing material 100 is also arranged in a staggered pattern), but the construction structure of the renovation roofing material according to the present invention is not limited to this arrangement. Furthermore, although Figure 1 shows the decorative slate 1000 as having a roughly rectangular shape with both corners on the ridge side missing, the construction structure of the roofing material for renovation according to the present invention is not limited to such a shape, and can accommodate various shapes of roofing materials, such as a perfectly rectangular shape, a shape with a slit in the direction of the eaves and ridge at the eaves end, and a shape with irregularities in the direction of the eaves and ridge at the eaves end (wave-shaped, mountain-shaped, stepped, etc.). One example of this is shown as decorative slate 3000 in the third embodiment described later.

[0017] As shown in Figures 1 and 4, these decorative slates 1000 are generally constructed by overlapping multiple decorative slates 1000 in a stepped manner in the eaves-ridge direction. The existing roof construction structure is completed by installing multiple decorative slates 1000 in this way in the eaves-ridge direction (sequentially from the eaves side to the ridge side in the eaves-ridge direction) and in the girder direction (sequentially from one end to the other end in the girder direction). Specifically, for the slate closest to the eaves in the eaves-ridge direction (the first one from the eaves side: N=1), one row of decorative slates 1000 is installed sequentially from one end to the other in the girder direction (sequentially laid). Then, for the Nth slate from the eaves side in the eaves-ridge direction (N=2, 3...), one row of decorative slates 1000 is installed sequentially from one end to the other (or vice versa) in the girder direction, and this process is repeated until the ridge side is reached. Note that the slates may be laid from the ridge side instead of the eaves side in the eaves-ridge direction. Furthermore, when installing (laying) a row of decorative slates 1000 in the direction of the beam, it is acceptable to lay them from the center rather than from one end to the other. Also, the decorative slates 1000 are fixed with roof nails 1002.

[0018] Figure 1 shows the commonly used directions for roof construction, such as the eaves side, ridge side, eaves-ridge direction, and beam direction. In this manner, without removing the decorative slate 1000 from the existing roof, the renovation roofing material 100 according to this embodiment is installed so as to cover (cover) the decorative slate 1000, thereby completing the construction structure using the renovation roofing material 100. In this case, the renovation roofing material 100 according to this embodiment is installed in combination with the joint cover 150. These renovation roofing materials 100 and joint cover 150 will be described in detail next.

[0019] • Renovation roofing material 100 and joint cover 150 The roof repair material 100 according to this embodiment is a roof repair material for existing roofs where thin, plate-shaped existing roof materials (decorative slates 1000) are installed in a stepped manner in the direction of the eaves and ridge. As shown in Figure 2(A), the roofing material 100 for renovation has a ridge-side insertion portion 130, a decorative surface portion 110, and an eave-side folded portion 120 integrally formed, and a water flow control means is formed in the decorative surface portion 110. As an example of this water flow control means, a recess is formed in the decorative surface portion 110 along a direction substantially perpendicular to the eave-ridge direction (left-right direction: girder direction). Furthermore, this recess is formed by a bellows-fold shape (a repeating shape of mountain folds and valley folds as shown in Figure 2) that includes at least two slopes, an eave-side slope and a ridge-side slope, and as shown in Figure 4(D), the inclination angle β (deg) of the eave-side slope is less than the roof slope α (deg: degrees) of the existing roof. Preferably, the recess is formed in the decorative surface portion 110 along substantially the entire length along a direction substantially perpendicular to the eave-ridge direction.

[0020] Furthermore, a water drain portion 128 is formed on the surface side between the decorative surface portion 110 and the eaves-side folded portion 120. As an example of this water drain portion 128, a chamfered shape of approximately 30 degrees can be seen as shown in Figure 2. When forming the water drain portion with a chamfered shape, a chamfered shape of approximately 5 degrees to approximately 60 degrees is preferable. Furthermore, the edge of the ridge-side insertion portion 130 is hemmed toward the back side (folded downward (back side) in the renovation roofing material 100 shown in Figure 2) (ridge-side hemmed portion 132). Also, the edge of the eaves-side folded portion 120 is hemmed toward the back side (folded upward (front side) in the renovation roofing material 100 shown in Figure 2) (eaves-side hemmed portion 122). Note that this hemming toward the back side refers to the hemming toward the back side of the rectangular, flat metal sheet before bending, etc., in which the ridge-side insertion portion 130, decorative surface portion 110, and eaves-side folded portion 120 are integrally formed by bending, etc., of a rectangular metal sheet whose length W in the direction perpendicular to the eaves-ridge direction (left-right direction: girder direction) is longer than the length L in the direction along the eaves-ridge direction, as described above. Furthermore, the hemming process basically includes not only the loop-shaped cross-section (eaves-side hemming section 122) adopted in the first and second embodiments, but also the folded-shaped cross-section (eaves-side hemming section 322) adopted in the third and fourth embodiments, as well as any other shapes in which the end (end face) is folded back primarily for the purpose of improving strength.

[0021] While not limited to these examples, one example is that the length W in the rafter direction of this renovation roofing material 100 is approximately 1800mm to 2000mm, and the length L in the direction along the eaves and ridge is approximately 200mm to 250mm. In contrast, the length W in the rafter direction of the existing decorative slate 1000 is approximately W / 2, and the length L in the direction along the eaves and ridge is approximately 2L. In other words, two decorative slates 1000 laid side by side in the rafter direction will be covered by two renovation roofing materials 100 laid side by side in the eaves and ridge direction.

[0022] Here, the roof repair material 100 is formed by bending a thin metal sheet (a substantially thin sheet-shaped member) into a predetermined shape, including a ridge-side insertion portion 130, a decorative surface portion 110, and an eaves-side folded portion 120. In this case, for example, a thin metal sheet wound in a roll is unwound in the direction of the beam, cut to a length W, and then bent into a predetermined shape, including hemming. In this embodiment, the case in which hemming and bending are performed by bending after cutting the thin metal sheet to a predetermined length W has been described, but it is not limited to this, and hemming and bending may also be performed by roll forming while unwound the thin metal sheet in the direction of the beam, and the method is not limited to these processing methods.

[0023] Furthermore, the roofing material 100 (and joint cover 150) for renovation is not limited to, but may be made from a variety of materials such as iron, aluminum, copper, stainless steel, titanium, aluminum-zinc alloy plated steel sheet, enamel steel sheet, clad steel sheet, laminated steel sheet (such as PVC steel sheet), sandwich steel sheet (such as vibration-damping steel sheet), etc. (including metal color sheets painted in various colors), or a variety of synthetic resin sheet material, such as polyvinyl chloride resin, polycarbonate resin, etc. (including synthetic resin color sheets painted in various colors). Among these, thin metal sheets (thickness of about 0.3 mm to 0.4 mm) are preferably used, and even more preferably, for example, aluminum-zinc alloy plated steel sheet or steel sheet to which magnesium has been added to provide rust prevention, are used, and are formed into various shapes by roll forming, press forming, extrusion forming, notching, etc.

[0024] Further details will be provided regarding the renovation roofing material 100 and the joint cover 150 used in combination with this renovation roofing material 100. As shown in Figure 2(A), the roofing material 100 for renovation, as described above, has a ridge-side insertion portion 130, a decorative surface portion 110, and an eaves-side folded portion 120 integrally formed. As described above, the decorative surface portion 110 is provided with a bellows-fold shape, which is an example of a water flow control means, and the edge of the ridge-side insertion portion 130 is hemmed toward the back side (ridge-side hemmed portion 132).

[0025] The eaves-side folded portion 120 has a water-draining portion 128 bent approximately 30 degrees from the decorative surface portion 110 toward the back side, a vertical portion 126 bent further approximately 60 degrees toward the back side from the water-draining portion 128, and an eaves-side insertion portion 124 bent further approximately 90 degrees toward the ridge side (the side where the eaves-side insertion portion 124 is approximately horizontal) from the vertical portion 126, and the edge of the eaves-side folded portion 120 (the edge of the eaves-side insertion portion 124) is hemmed toward the back side (eaves-side hemmed portion 122). It is also preferable to provide small-diameter drainage holes 140 at regular intervals in the direction of the beam, near the boundary between the vertical portion 126 and the eaves-side insertion portion 124.

[0026] The joint cover 150, used in combination with the refurbishment roofing material 100, is a cover that covers the gap between two refurbishment roofing materials 100 that are arranged side by side in the direction of the beam, from above the refurbishment roofing material 100. The joint cover 150 is integrally formed with a shape that substantially matches the shape of the decorative surface portion 110 and the eaves-side folded portion 120 (more specifically, the vertical portion 126 and the flashing portion 128) of the refurbishment roofing material 100 (it does not have a shape that substantially matches the ridge-side insertion portion 130).

[0027] The joint cover 150 comprises a cover decorative surface portion 160 that substantially matches the shape of the decorative surface portion 110 of the refurbished roofing material 100, and a cover eaves-side folded portion 170 that substantially matches the vertical portion 126 and the flashing portion 128 of the refurbished roofing material 100. The cover vertical portion 176 of the joint cover 150 substantially matches the vertical portion 126 of the refurbished roofing material 100, and the cover flashing portion 178 of the joint cover 150 substantially matches the flashing portion 128 of the refurbished roofing material 100. The cover vertical portion 176 of the joint cover 150 does not block the drainage holes 140 of the refurbished roofing material 100. The joint cover 150 has hemmed edges on both ends in the girder direction (cover hemmed portion 152). The direction of rainwater flow from the drainage holes 140 is indicated by the black arrows in Figure 4(B).

[0028] This joint cover 150 is installed between the renovation roofing material 100, which is installed on top of the existing decorative slate 1000 to cover the decorative slate 1000, and the renovation roofing material 100 installed in the direction of the beam. The construction structure using such renovation roofing material 100 and joint cover 150 will be described in detail below.

[0029] ·Construction structure As described above, for an existing roof constructed with decorative slate 1000, the renovation roofing material 100 is installed on top of the existing decorative slate 1000 so as to cover the decorative slate 1000, and joint covers 150 are provided between the renovation roofing materials 100 installed in the girder direction to cover the gaps between them. In the following, this construction structure will be explained mainly with reference to Figure 4. Note that some roof construction structures and methods other than the renovation roofing material 100 and joint covers 150 are not described here because they are not directly related to the present invention.

[0030] Although Figures 1 and 4 show the process of installing the roof repair material 100 from the eaves side to the ridge side, in the installation of the roof repair material 100 according to this embodiment, the installation can be done from the eaves side to the ridge side or from the ridge side to the eaves side. In the following explanation, we will assume that the installation is done from the ridge side to the eaves side. In this case, when a worker installs the refurbishment roofing material 100, the worker stands on one or two decorative slates 1000 on the eaves side of the decorative slates 1000 that will be covered by the refurbishment roofing material 100, and reaches from the eaves side to the ridge side to install the refurbishment roofing material 100 sequentially from one end to the other in the direction of the beam. Once all of the refurbishment roofing material 100 and joint covers 150 for one row (one section of refurbishment roofing material 100) in the direction of the beam has been installed, the worker moves at least one section towards the eaves (the worker will move down from the decorative slates 1000 on the ridge side to the decorative slates 1000 on the eaves side) and installs one section further towards the eaves than the section that has just been installed. Specifically, for the ridge-side (1st from the ridge: N=1) in the eaves-ridge direction, one row of renovation roofing material 100 and joint cover 150 is installed sequentially from one end to the other in the girder direction. Then, for the Nth (N=2, 3...) from the ridge-side in the eaves-ridge direction, one row of renovation roofing material 100 and joint cover 150 is installed sequentially from one end to the other (or vice versa) in the girder direction, and this process is repeated until the eaves side is reached. This method of installation is preferable because it avoids workers having to step on the renovation roofing material 100 and joint cover 150 after installation, even if workers have to step on the existing decorative slate 1000.

[0031] First, when the renovation roofing material 100 is installed to cover the existing decorative slate 1000 roofing material, as shown in Figure 4, the edge of the ridge-side insertion portion 130 (ridge-side hemmed portion 132) of the renovation roofing material 100 is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 122). More specifically, as shown in Figure 4(B), the edge of the ridge-side insertion portion 130 (ridge-side hemmed portion 132) of the renovation roofing material 100 (here, the eaves-side renovation roofing material 100D) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 122) of the renovation roofing material 100 (here, the ridge-side renovation roofing material 100U) one ridge away from the eaves-side renovation roofing material 100D. The renovation roofing material 100 is installed so that the positional relationship between the renovation roofing materials 100 in the eaves-ridge direction is as described above. As shown in Figure 4(B), the joint cover 150 (here, the eaves joint cover 150D) is installed on the upper side of the installed refurbished roofing material 100 so as to cover the gaps between adjacent refurbished roofing materials 100 in the eaves direction, and so as to cover the gaps between adjacent refurbished roofing materials 100 in the eaves direction, the joint cover 150 (here, the eaves joint cover 150D) is installed on the upper side of the refurbished roofing material 100 (here, the eaves refurbished roofing material 100D) so as to be positioned between the ridge-side insertion portion 130 of the refurbished roofing material 100 (here, the eaves refurbished roofing material 100D) and the eaves-side folded portion 120 of the refurbished roofing material 100 (here, the ridge-side refurbished roofing material 100U) one ridge away from the eaves refurbished roofing material 100D. Figure 4(B) shows the state in which the ridge-side joint cover 150U is directly positioned on the upper side of the ridge-side refurbished roofing material 100U (from the surface side, in the order of joint cover 150, refurbished roofing material 100, and decorative slate 1000). Here, since Figure 4(B) is a cross-sectional view in the flow direction, the position of the eaves-side joint cover 150D and the ridge-side joint cover 150U in the girder direction is offset by half the length W of the renovation roofing material 100.

[0032] This process is carried out by sequentially installing (laying sequentially) a row of renovation roofing material 100 and joint cover 150 in the girder direction from one end to the other for the ridge-side (1st from the ridge: N=1) in the eaves-ridge direction. Then, for the Nth (N=2, 3...) from the ridge-side in the eaves-ridge direction, sequentially installing a row of renovation roofing material 100 and joint cover 150 in the girder direction from one end to the other (or vice versa) is repeated until the eaves side is reached. Here, for the outermost part of the roof in the direction of the eaves and ridge, as shown in Figure 4(A), the eaves-side folded portion 120 of the refurbished roofing material 100 may not cover the starter 1050 (for matching the roof slope) but only the decorative slate 1000. Alternatively, as shown in Figure 4(C), instead of the refurbished roofing material 100, a refurbished roofing material 190 may be used, which has a vertical portion 196 that is extended by the thickness of the starter 1050 by the vertical portion 126 of the eaves-side folded portion, so that the eaves-side folded portion covers the starter 1050 and the decorative slate 1000. The refurbished roofing material 100 and the joint cover 150 may be fixed by simply inserting them, or they may be bonded and fixed to the decorative slate 1000 using adhesive, or other general methods may be used.

[0033] In addition to the decorative slate 1000 (and roof nails 1002), the rafters 1010, roof sheathing 1020, underlayment 1030, eaves flashing 1040, and starter 1050 in Figure 4 are existing components. Figure 5 also shows the gable flashing 1060 and sealant 1070.

[0034] • Effects and Actions As described above, the roof repair material 100 and construction structure using the same according to the embodiment of the present invention provide the following effects. (1) A water flow control means is formed on the decorative surface 110. As an example of this water flow control means, a recess is formed on the decorative surface 110 in a direction substantially perpendicular to the eaves and ridge direction. As an example of this recess, it is formed in a bellows-fold shape (a repeating shape of mountain folds and valley folds as shown in Figure 2) that includes at least two slopes, an eaves-side slope and a ridge-side slope. As shown in Figure 4(D), the inclination angle β (deg) of the eaves-side slope is less than the roof slope α (deg) of the existing roof.

[0035] As a result, the recess, which is an example of a water flow control mechanism, prevents rainwater from accumulating in the recess (because the slope of the eaves side is always less than horizontal and never greater than horizontal), allowing rainwater to flow in the direction of the girder, thus averaging the flow rate of rainwater from the ridge to the eaves in the direction of the girder. Note that averaging does not mean that the flow from the ridge to the girder can be perfectly averaged, but rather that some degree of averaging can be achieved. Furthermore, the shape of this recess can improve the aesthetic appearance of the renovation roofing material 100 and improve the strength of the renovation roofing material 100.

[0036] (2) A water drainage portion 128 (for example, a chamfered shape of 30 degrees as shown in Figure 2) is formed on the surface between the decorative surface portion 110 and the eaves-side folded portion 120. This improves the water drainage performance of the renovation roofing material 100 so that rainwater does not remain near the eaves end of the decorative surface 110 due to surface tension, improves the aesthetic appearance of the renovation roofing material 100, and improves the strength of the renovation roofing material 100.

[0037] (3) The edge of the ridge-side insertion portion 130 is hemmed toward the back side (towards the back side of the rectangular and flat metal sheet before bending or other processing) (ridge-side hemmed portion 132). This improves the water-repellent performance of the renovation roofing material 100, effectively preventing rainwater from entering the building, improving the strength of the renovation roofing material 100, and effectively preventing the renovation roofing materials 100 from coming loose from each other after installation.

[0038] (4) The edge of the eaves-side folded portion 120 is hemmed toward the back side (towards the back side of the rectangular and flat metal sheet before bending or other processing) (eaves-side hemmed portion 122). This makes it easier to insert the refurbished roofing material 100 into the decorative slate on the eaves side and improves the strength of the refurbished roofing material 100. Here, the hemming of the edge of the ridge-side insertion part 130 in (3) and the hemming of the edge of the eaves-side folded-back part 120 in (4) are hemming processes performed on a rectangular and flat metal sheet before bending or other processes, and since the hemming is done in the same direction (if the outer side (outside air side) of the decorative surface is considered the surface, both are hemming processes that fold back to the back side), the hemming can be easily performed.

[0039] (5) The edge of the ridge-side insertion portion 130 of the roof repair material 100 (ridge-side hemmed portion 132) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 122). As a result, the edge of the ridge-side insertion portion 130 (ridge-side hemmed portion 132) is positioned higher (upper) than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 122), thus effectively preventing rainwater from entering the building. Furthermore, the edges of the ridge-side insertion portion 130 (ridge-side hemmed portion 132) and the edges of the eaves-side folded portion 120 (eaves-side hemmed portion 122) repel each other, effectively preventing rainwater from entering the building and effectively preventing the roofing materials 100 for renovation from coming loose after installation.

[0040] Thus, according to the renovation roofing material 100 and the construction structure using the same in this embodiment, it is possible to provide a renovation roofing material that is installed to cover existing thin-plate shaped roofing materials that are installed in a stepped manner in the eaves-ridge direction, and that can average the flow rate of rainwater in the direction perpendicular to the eaves-ridge direction (left-right direction), and a construction structure using the renovation roofing material.

[0041] <Second Embodiment> Next, with reference to Figure 6, which shows a perspective view of a roof under renovation using the renovation roofing material 200 according to the second embodiment of the present invention; Figure 7(A), which shows a three-view drawing of the renovation roofing material 200; Figure 7(B), which shows a three-view drawing of a joint flashing 250 used together with the renovation roofing material 200; Figure 8, which shows a plan view of Figure 6; Figure 9, which shows a cross-sectional view in the flow direction of Figure 6; and Figure 10, which shows a cross-sectional view in the gable direction of Figure 6, the renovation roofing material 200 according to the second embodiment and the construction structure of a roof using this renovation roofing material 200 will be described in detail. Note that Figure 6 corresponds to Figure 1 above, Figure 7 corresponds to Figure 2 above, Figure 8 corresponds to Figure 3 above, Figure 9 corresponds to Figure 4 above, and Figure 10 corresponds to Figure 5 above.

[0042] Furthermore, while the roof repair material 100 according to the first embodiment described above is a roof repair material in which both ends in the longitudinal direction (the direction perpendicular to the eaves and ridge direction (left-right direction: girder direction)) are not hemmed, the roof repair material 200 according to this second embodiment differs in that both ends are hemmed. Other structural and construction structures that are the same as those in the first embodiment are denoted by the same reference numerals in the second embodiment. Since their explanations would be redundant with those described above, they will not be repeated below.

[0043] As described above, the existing roof structure using the renovation roofing material 200 is completed by installing the renovation roofing material 200 so as to cover (cover) the decorative slate 1000 without removing it from the existing roof. In this case, the renovation roofing material 200 according to this embodiment is installed in combination with the joint flashing plate 250. These renovation roofing materials 200 and joint flashing plates 250 are decorative For an existing roof constructed with slate 1000, as shown in Figures 6 and 8 to 10, joint flashing plates 250 are installed between the renovation roofing materials 200 that are installed in the rafter direction on top of the existing decorative slate 1000, covering the gaps between them from below before the decorative slate 1000 is covered, and then the renovation roofing materials 200 are installed.

[0044] In other words, in the first embodiment, the roof repair material 100 has both ends in the longitudinal direction (girder direction) that are not hemmed, and a joint cover 150 with both ends in that direction that is hemmed covers the gap between adjacent roof repair materials 100 in the girder direction by covering the roof repair material 100 from above, whereas in the second embodiment, the roof repair material 200 has both ends in the longitudinal direction (girder direction) that are hemmed, and a joint sacrificial plate 250 with both ends in that direction that is not hemmed is installed on the underside of the roof repair material 100, thereby covering the gap between adjacent roof repair materials 100 in the girder direction from below.

[0045] Focusing on this difference, the roof repair material 200 and joint flashing plate 250 according to this embodiment will be described with reference to Figure 7. Comparing Figure 7 with Figure 2, the roof repair material 200 according to this embodiment has hemmed roof material portions 202 on both ends in the girder direction (which are not provided by the roof repair material 100 according to the first embodiment), and the joint sacrificial plate 250 according to this embodiment does not have hemmed cover portions 152 on both ends in the girder direction (which are provided by the joint cover 150 according to the first embodiment). Note that the joint sacrificial plate 250, which is hidden on the underside of the roof repair material 200 as shown in Figures 6 and 8 to 10, may be longer in the girder direction than the joint cover 150 as shown in Figure 7.

[0046] Furthermore, a water drain portion 228 is formed on the surface side between the decorative surface portion 110 and the eaves-side folded portion 120. As an example of this water drain portion 228, a chamfered shape of approximately 45 degrees can be seen as shown in Figure 7. More specifically, the eaves-side folded portion 120 comprises a water drain portion 228 bent approximately 45 degrees toward the back side from the decorative surface portion 110, a vertical portion 126 bent further approximately 45 degrees toward the back side from the water drain portion 228, an eaves-side insertion portion 124, and an eaves-side hemmed portion 122.

[0047] The joint sacrificial plate 250, used in combination with the refurbished roofing material 200, is a sacrificial plate that covers the gap between two refurbished roofing materials 200 arranged side by side in the girder direction, on the underside of the refurbished roofing material 100. The joint sacrificial plate 250 is integrally formed to have a shape that substantially matches the shape of the decorative surface portion 110 of the refurbished roofing material 100 (without having a shape that substantially matches the eaves-side folded portion 120 and the ridge-side insertion portion 130), and to have a sacrificial plate vertical portion 276 with the eaves-side end bent by approximately 90 degrees.

[0048] Regarding the materials, the roof repair material 200 is the same as the roof repair material 100, and the joint flashing 250 is the same as the joint cover 150. These are made of thin metal sheets (approximately 0.3 mm to 0.4 mm thick), such as aluminum-zinc alloy coated steel sheets. In this case, the bellows-fold shape, which is an example of a water flow control means, is the same for both the roof repair material 100 according to the first embodiment and the roof repair material 200 according to the second embodiment. The depth of the mountain folds and valley folds shown in Figure 7, which realize this bellows-fold shape, is approximately 0.35 mm to 0.5 mm (although it is not shown in Figure 9 because it is the same, it naturally satisfies the condition shown in Figure 4(D) where the roof slope α of the existing roof > the slope angle β of the eaves side), which is also the same as in the first embodiment. The slight protrusions (peaks) caused by these mountain folds and the slight recesses (valleys) caused by these valley folds are virtually shown in Figure 7, with mountain folds represented by solid lines and valley folds by dashed lines, and in Figures 6 and 8, both are represented by solid lines.

[0049] Regarding the construction structure, when the renovation roofing material 200 is installed to cover the existing roofing material, decorative slate 1000, the position of the ridge-side insertion portion 130 (ridge-side hemmed portion 132) of the renovation roofing material 200 is the same as in the first embodiment, as shown in Figure 9, in that it is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 122). That is, as shown in Figure 9(B), the positional relationship is such that the edge of the ridge-side insertion portion 130 (ridge-side hemmed portion 132) of the renovation roofing material 200 (here, eaves-side renovation roofing material 200D) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 122) of the renovation roofing material 200 (here, ridge-side renovation roofing material 200U) one ridge away from the eaves-side renovation roofing material 200D. The renovation roofing materials 200 are installed so that their relative positions in the eaves-ridge direction are as shown. Before installing the renovation roofing materials 200 in the rafter direction, joint flashing plates 250 (in this case, eaves-side joint flashing plates 250D) are installed on the underside of the renovation roofing materials 200 after installation, so as shown in Figure 9(B), the joint flashing plates 250 (in this case, eaves-side joint flashing plates 250D) are positioned below the ridge-side insertion portion 130 of the renovation roofing material 200 (in this case, eaves-side renovation roofing material 200D) and below the eaves-side folded portion 120 of the renovation roofing material 200 one ridge away from the eaves-side renovation roofing material 200D (in this case, ridge-side renovation roofing material 200U), so as to cover the gaps between adjacent renovation roofing materials 200 in the rafter direction from below. Figure 9(B) shows the state in which the ridge-side joint flashing 250U is directly positioned below the ridge-side repair roofing material 200U (in the order from the surface side: repair roofing material 200, joint flashing 250, and decorative slate 1000). Here, since Figure 9(B) is a cross-sectional view in the direction of flow, the position of the eaves-side joint flashing 250D and the ridge-side joint flashing 250U in the direction of the beam is offset by half the length W of the repair roofing material 200.

[0050] • Effects and Actions As described above, the roof repair material 200 and the construction structure using it according to this embodiment also produce the effects (1) to (5) described above. Regarding the effect (2), it is as follows: A water drainage portion 228 (for example, a 45-degree chamfer shape as shown in Figure 7) is formed on the surface between the decorative surface portion 110 and the eaves-side folded portion 120. Furthermore, the renovation roofing material 200 provides the following effects: (6) Both ends of the vertical (longitudinal (girder)) edge in the eaves direction are hemmed towards the back side (roof material hemmed section 202, shape is loop-shaped).

[0051] This makes it less likely for the roofing material 200 to deform when installed, even if the edges of the roofing material 200 in the direction of the beam are strongly struck with a hammer or mallet for alignment. Thus, according to the roof repair material 200 and construction structure using the same in this embodiment, it is possible to provide a roof repair material that is installed to cover existing thin-plate shaped roof materials that are installed in a stepped manner in the eaves-ridge direction, and that can average the flow rate of rainwater in the direction perpendicular to the eaves-ridge direction (left-right direction), and a construction structure using the roof repair material.

[0052] <Third Embodiment> Next, with reference to Figure 11, which shows a perspective view of a roof under renovation using the renovation roofing material 300 according to the third embodiment of the present invention; Figure 12(A), which shows a three-view drawing of the renovation roofing material 300; Figure 12(B), which shows a three-view drawing of a joint flashing 350 used together with the renovation roofing material 300; Figure 13, which shows a plan view of Figure 11; Figure 14, which shows a cross-sectional view of Figure 11 in the flow direction; and Figure 15, which shows a cross-sectional view of Figure 11 in the gable direction, the renovation roofing material 300 according to the third embodiment and the construction structure of a roof using this renovation roofing material 300 will be described in detail. Note that Figure 11 corresponds to Figures 1 and 6 above, Figure 12 corresponds to Figures 2 and 7 above, Figure 13 corresponds to Figures 3 and 8 above, Figure 14 corresponds to Figures 4 and 9 above, and Figure 15 corresponds to Figures 5 and 10 above. As shown in Figures 11 to 15, the renovation roofing material according to the third embodiment The repair roofing material 300 and the construction structure of a roof using this repair roofing material 300 have the following characteristics. In the following, these characteristics will be described mainly in terms of how they differ from the first and second embodiments described above. Other structures and construction structures that are the same as those in the first and second embodiments are denoted by the same reference numerals in this third embodiment as in the first and second embodiments. Since their descriptions would be redundant with the descriptions above, they will not be described again below.

[0053] As shown in Figures 11 and 13, the existing roofing material in the first and second embodiments described above is a decorative slate 1000 with a roughly rectangular shape lacking both corners, whereas the existing roofing material in this third embodiment is a decorative slate 3000 with a corrugated shape having irregularities in the eaves direction at the eaves end.

[0054] As shown in Figures 12 and 14, the roof repair material 100 according to the first embodiment and the roof repair material 200 according to the second embodiment described above have a recess formed in the decorative surface portion 110 along a substantially vertical direction (left-right direction: girder direction) in the eaves-ridge direction as an example of a water flow control means, and this recess is formed in a bellows-fold shape (a repeating shape of mountain folds and valley folds) that includes at least two slopes, an eaves-side slope and a ridge-side slope. In contrast, as shown in Figure 14(C) which emphasizes this recess, the roof repair material 300 according to the third embodiment differs in that the recess is formed in a valley-fold bend shape consisting of only one eaves-side slope. Furthermore, while the roof repair material 100 according to the first embodiment and the roof repair material 200 according to the second embodiment described above have the edges of the ridge-side insertion portion 130 hemmed toward the back side (ridge-side hemmed portion 132), the roof repair material 300 according to this third embodiment differs in that the edges of the ridge-side insertion portion 130 are not hemmed. Furthermore, while the edges of the eaves-side folded portion 120 of the roof repair material 100 and the roof repair material 200 according to the first embodiment described above are hemmed toward the back side (eaves-side hemmed portion 122), the roof repair material 300 according to the third embodiment also has the edges of the eaves-side folded portion 120 hemmed toward the back side (eaves-side hemmed portion 322). However, unlike the roof repair material 100 and the roof repair material 200 according to the first embodiment described above, the eaves-side hemmed portion 122 of the roof repair material 300 according to the third embodiment is formed in a loop shape, whereas the eaves-side hemmed portion 322 of the roof repair material 300 according to the third embodiment is formed in a folded shape. Furthermore, the roof repair material 100 according to the first embodiment described above is a roof repair material in which both ends in the longitudinal direction (direction perpendicular to the eaves and ridge direction (left-right direction: girder direction)) are not hemmed, and the roof repair material 300 according to this third embodiment is also similar in that both ends in the longitudinal direction are not hemmed.Furthermore, while the roof repair material 200 according to the second embodiment described above is a roof repair material in which both ends in the longitudinal direction (the direction perpendicular to the eaves and ridge direction (left-right direction: girder direction)) are hemmed, the roof repair material 300 according to this third embodiment differs in that both ends in the longitudinal direction are not hemmed.

[0055] Furthermore, while the joint sacrificial plate 250 according to the second embodiment described above is formed to conform to the bellows-fold shape of the roof repair material 200 (see Figure 7(B)), the joint sacrificial plate 350 according to this third embodiment differs in that, as shown in Figure 12(B), the eaves-side end is bent downwards at approximately 90 degrees, and the other parts are formed flat rather than having a valley-fold bend.

[0056] As described above, the existing roof structure using the renovation roofing material 300 is completed by installing the renovation roofing material 300 so as to cover the decorative slate 3000 without removing it from the existing roof. In this case, the renovation roofing material 300 according to this embodiment is installed in combination with the joint sacrificial plate 350. The roofing materials 300 and joint flashing plates 350 are installed on an existing roof constructed with decorative slate 3000. As shown in Figures 11 and 13 to 15, the joint flashing plates 350 are placed between the roofing materials 300 installed in the girder direction, covering the gaps between them from below, before the decorative slate 3000 is covered on top of the existing decorative slate 3000.

[0057] In other words, in the first embodiment, the roof repair material 100 has both ends in the longitudinal direction (girder direction) that are not hemmed, and a joint cover 150 with both ends in that direction that is hemmed covers the gap between adjacent roof repair materials 100 in the girder direction by covering the roof repair material 100 from above, while in the second embodiment, the roof repair material 200 has both ends in the longitudinal direction (girder direction) that are hemmed, and a joint sacrificial plate 250 with both ends in that direction that is not hemmed is installed on the underside of the roof repair material 100 to cover the gap between adjacent roof repair materials 100 in the girder direction from below, whereas in the third embodiment, the roof repair material 300 has both ends in the longitudinal direction (girder direction) that are not hemmed, and a joint sacrificial plate 350 with both ends in that direction that is not hemmed is installed on the underside of the roof repair material 300 to cover the gap between adjacent roof repair materials 300 in the girder direction from below.

[0058] Focusing on this difference, the roof repair material 300 and joint flashing plate 350 according to this embodiment will be described with reference to Figure 12. Comparing Figure 12 with Figures 2 and 7, the roof repair material 300 according to this embodiment does not have the hemmed roof material portion 202 on both ends in the girder direction (which is not provided by the roof repair material 100 according to the first embodiment, but is provided by the roof repair material 200 according to the second embodiment), and the joint sacrificial plate 350 according to this embodiment does not have the hemmed cover portion 152 on both ends in the girder direction (which is provided by the joint cover 150 according to the first embodiment, but is not provided by the joint sacrificial plate 250 according to the second embodiment). Note that, as shown in Figures 11 and 13 to 15, the joint sacrificial plate 350, which is hidden on the underside of the roof repair material 300, may be longer in the girder direction than the joint cover 350, as shown in Figure 12. When manufactured from the same material as the roof repair material 300, it does not form a folded portion like the eaves-side insertion portion 124 of the roof repair material 300, so unless it is specifically cut, it will be longer in the girder direction than the joint cover 350.

[0059] Furthermore, a water drain portion 328 is formed on the surface side between the decorative surface portion 110 and the eaves-side folded portion 120. As an example of this water drain portion 328, a chamfered shape of approximately 60 degrees can be seen as shown in Figure 12. More specifically, the eaves-side folded portion 120 comprises a water drain portion 328 bent approximately 60 degrees toward the back side from the decorative surface portion 110, a vertical portion 126 bent further approximately 30 degrees toward the back side from the water drain portion 328, an eaves-side insertion portion 124, and an eaves-side hemmed portion 322 (folded shape described later).

[0060] The joint sacrificial plate 350, used in combination with the refurbished roofing material 300, is a sacrificial plate that covers the gap between two refurbished roofing materials 300 that are arranged side by side in the girder direction, on the underside of the refurbished roofing material 300. The joint sacrificial plate 350 is integrally formed to have a shape that substantially matches the shape of the decorative surface portion 110 of the refurbished roofing material 300 described above (without having a shape that substantially matches the eaves-side folded portion 120), and to have a sacrificial plate vertical portion 276 with the eaves-side end bent by approximately 90 degrees.

[0061] Regarding the materials, the renovation roofing material 300 is the same as the renovation roofing material 100 or renovation roofing material 200, and the joint flashing plate 350 is the same as the joint cover 150 or joint flashing plate 250. These are made of thin metal sheets (approximately 0.3 mm to 0.4 mm thick), such as aluminum-zinc alloy plated steel sheet. In this case, The valley-fold bend shape, in which the recess, which is an example of a water flow control means, consists of only one eaves-side slope, is different from the bellows-fold shape common to the renovation roofing material 100 according to the first embodiment and the renovation roofing material 200 according to the second embodiment. The depth of the valley fold shown in Figure 12, which realizes this valley-fold bend shape consisting of only one eaves-side slope, is approximately 0.35 mm to 0.5 mm (it is natural that the roof slope α of the existing roof shown in Figure 14(D) > the inclination angle γ of the eaves-side slope) is the same as in the first and second embodiments. The slight recess (valley) resulting from this valley fold is virtually shown by a dashed line in Figure 12, and by a solid line in Figures 11 and 13.

[0062] Regarding the construction structure, when the renovation roofing material 300 is installed to cover the existing decorative slate 3000 roofing material, as shown in Figure 14, the edge of the ridge-side insertion portion 130 of the renovation roofing material 300 (without ridge-side hemming) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemming 322, which has a folded shape). In other words, as shown in Figure 14(B), the edge of the ridge-side insertion portion 130 of the renovation roofing material 300 (here, the eaves-side renovation roofing material 300D) (without ridge-side hemming) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemming 322, which has a folded shape) of the renovation roofing material 300 one ridge away from the eaves-side renovation roofing material 300D (here, the ridge-side renovation roofing material 300U). The renovation roofing materials 300 are installed so that their relative positions in the eaves-ridge direction are as shown. Before installing the renovation roofing materials 300 in the rafter direction, joint flashing plates 350 (in this case, eaves-side joint flashing plates 350D) are installed on the underside of the installed renovation roofing materials 300 so that they cover the gaps between adjacent renovation roofing materials 300 in the rafter direction from below, as shown in Figure 14(B), so that the joint flashing plates 350 (in this case, eaves-side joint flashing plates 350D) are positioned below the ridge-side insertion portion 130 of the renovation roofing material 300 (in this case, eaves-side renovation roofing material 300D) and below the eaves-side folded portion 120 of the renovation roofing material 300 (in this case, ridge-side renovation roofing material 300U) one ridge away from the eaves-side renovation roofing material 300D. Figure 14(B) shows the state in which the ridge-side joint slab 350U is directly positioned below the ridge-side repair roofing material 300U (in the order of repair roofing material 300, joint slab 350, and decorative slate 3000 from the surface side). Here, since Figure 14(B) is a cross-sectional view in the flow direction, the position of the eaves-side joint slab 350D and the ridge-side joint slab 350U in the girder direction is offset by half the length W of the repair roofing material 300. As shown in Figures 12(A) and 14(C), the maximum height (T) of the inner cavity of the eaves-side folded portion 120 of the repair roofing material 300 is made larger than the thickness of the decorative slate 3000 to accommodate variations in the thickness of the decorative slate 3000.The height of the vertical section 126 is made to be equal to or greater than the thickness of the decorative slate 3000.

[0063] • Effects and Actions As described above, the roof repair material 300 and construction structure using the same according to the embodiment of the present invention provide the following effects. (7) A water flow control means is formed on the decorative surface 110. As an example of this water flow control means, a recess is formed on the decorative surface 110 in a direction substantially perpendicular to the eaves and ridge direction (left-right direction: girder direction). This recess is formed by a valley-fold bend shape in which the recess consists of only one eaves-side slope, and as shown in Figure 14(D), the inclination angle γ(deg) of the eaves-side slope is less than the roof slope α(deg) of the existing roof.

[0064] As a result, the recess, which is an example of a water flow control mechanism, prevents rainwater from accumulating in the recess (because the slope of the eaves side is always less than horizontal and never greater than horizontal), allowing rainwater to flow in the direction of the girder, thus averaging the flow rate of rainwater from the ridge to the eaves in the direction of the girder. The meaning of being able to average is as described above. In addition, due to the shape of this recess, a line of valley bends can be seen at a constant pitch (equivalent to the working length in the direction of the eaves and ridge) in the direction of the eaves and ridge, making it possible to repair the roof This can improve the aesthetic appeal of the base material 300, or improve the strength of the roofing material 300 for renovation.

[0065] (8) A water drainage portion 328 (for example, a chamfered shape of 60 degrees as shown in Figure 12) is formed on the surface side between the decorative surface portion 110 and the eaves-side folded portion 120. This improves the water drainage performance of the renovation roofing material 300 so as to suppress the residue of rainwater due to surface tension near the eaves end of the decorative surface 110, improves the aesthetic appearance of the renovation roofing material 300, improves the strength of the renovation roofing material 300, and allows the maximum height (T) of the inner cavity of the eaves-side folded portion 120 of the renovation roofing material 300 to be greater than the thickness of the decorative slate 3000, thereby accommodating variations in the thickness of the decorative slate 3000.

[0066] Here, the flashing portion 128 in the refurbished roofing material 100 described above is 30 degrees, the flashing portion 228 in the refurbished roofing material 200 is 45 degrees, and the flashing portion 328 in the refurbished roofing material 300 according to this embodiment is 60 degrees. However, when forming the flashing portion by chamfering, such a range of approximately 30 to approximately 60 degrees is preferable.

[0067] (9) The edges of the ridge-side insertion portion 130 are not hemmed. This makes it easier to insert the renovation roofing material 300 into the decorative slate on the ridge side, and also reduces the number of steps in the manufacturing process. (10) The edge of the eaves-side folded portion 120 is hemmed toward the back side (towards the back side of the rectangular and flat metal sheet before bending or other processing) (eaves-side hemmed portion 322, which has a folded shape).

[0068] This makes it easier to insert the refurbished roofing material 300 into the decorative slate on the eaves side, improves the strength of the refurbished roofing material 300, and allows the eaves-side hemmed portion 322 to rub against the back surface of the decorative slate, thereby effectively preventing the refurbished roofing material 300 from coming off after installation. (11) The edge of the ridge-side insertion portion 130 of the roofing material 300 (without ridge-side hemming) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemming 322).

[0069] As a result, the edge of the ridge-side insertion portion 130 (without the ridge-side hemmed portion) is positioned higher (upper) than the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 322), thus effectively preventing rainwater from entering the building. Furthermore, the edges of the ridge-side insertion portion 130 and the eaves-side folded portion 120 (eaves-side hemmed portion 322) are in close contact with each other, effectively preventing rainwater from entering the building and effectively preventing the roofing materials 100 for renovation from coming loose after installation.

[0070] Thus, according to the renovation roofing material 300 and the construction structure using the same in this embodiment, it is possible to provide a renovation roofing material that is installed to cover existing thin-plate shaped roofing materials that are installed in a stepped manner in the eaves-ridge direction, and that can average the flow rate of rainwater in the direction perpendicular to the eaves-ridge direction (left-right direction), and a construction structure using the renovation roofing material. As described above, the roof repair material 300 and the construction structure using it according to this embodiment also produce the same effects (7) to (11) as those described above (1) to (5). Furthermore, the renovation roofing material 300 exhibits the following effects in addition to those mentioned above.

[0071] (12) The eaves-side hemmed portion 322 of the roofing material 300 for renovation is formed in a folded shape rather than a loop shape. This reduces resistance when inserting the nail into the decorative slate compared to a loop shape, improving ease of installation. Thus, according to the renovation roofing material 300 and the construction structure using the same in this embodiment, it is possible to provide a renovation roofing material that is installed to cover existing thin-plate shaped roofing materials that are installed in a stepped manner in the eaves-ridge direction, and that can average the flow rate of rainwater in the direction perpendicular to the eaves-ridge direction (left-right direction), and a construction structure using the renovation roofing material.

[0072] <Fourth Embodiment> Next, the roof repair material 400 according to the fourth embodiment of the present invention and the construction structure of a roof using this roof repair material 400 will be described in detail with reference to Figure 16, which shows a perspective view of a roof under repair using the roof repair material 400 according to the fourth embodiment of the present invention; Figure 17(A), which shows a three-view drawing of the roof repair material 400; Figure 17(B), which shows a three-view drawing of a joint flashing 350 used together with the roof repair material 400; Figure 18, which shows a plan view of Figure 16; Figure 19, which shows a cross-sectional view in the flow direction of Figure 16; and Figure 20, which shows a cross-sectional view in the gable direction of Figure 16. As shown in Figures 16 to 21, the roof repair material 400 and the roof construction structure using this roof repair material 400 according to the fourth embodiment have the following features. In the following, these features will be described mainly in terms of how they differ from the first to third embodiments described above. Other structures and construction structures that are the same as those in the first to third embodiments are denoted by the same reference numerals in this fourth embodiment as in the first to third embodiments. Since their descriptions would be redundant with the descriptions above, they will not be described again below.

[0073] As shown in Figures 16 and 18, the existing roofing material according to this fourth embodiment is a decorative slate 1000 with a roughly rectangular shape and no corners, similar to the existing roofing material according to the first embodiment and the existing roofing material according to the second embodiment described above. As shown in Figures 17 and 19, the water flow control means of the refurbishment roofing material 100 according to the first embodiment and the refurbishment roofing material 200 according to the second embodiment described above has a recess formed in the decorative surface portion 110 along a substantially vertical direction (left-right direction: girder direction) in the eaves-ridge direction, with a bellows-fold shape (a repeating shape of mountain folds and valley folds) including at least two slopes, an eaves-side slope and a ridge-side slope. The water flow control means of the refurbishment roofing material 300 according to the third embodiment described above has a recess with a valley-fold bend shape consisting of only one eaves-side slope. In contrast to the formation of the recess, as shown in Figure 19(C) which emphasizes this recess, the water flow control means of the refurbishment roofing material 400 according to this fourth embodiment is similar to the refurbishment roofing material 300 according to the third embodiment in that the recess is formed by a valley-fold bend shape consisting of only one eaves-side slope. However, in addition to the one recess (valley-fold bend shape) which is the water flow control means formed on the decorative surface portion 110 of the refurbishment roofing material 400, one mountain fold is formed on the eaves side of this recess, so that one mountain fold and one valley fold are formed. Due to this mountain fold, although the position of the ridge-side end of the flashing portion 428 of the refurbishment roofing material 400 (H(2) shown in Figure 19(C)) is approximately the same as the position of the eaves-side end of the eaves-side folded portion 120 (H(1) shown in Figure 19(C)) in plan view, H(2) > H(1), thus providing flashing. Therefore, the drainage section 428 is formed more gently than the drainage sections 128, 228, and 328 which are formed by chamfering.

[0074] Because the water drainage portion 428 is formed in this way, as shown in Figure 17(A), the eaves-side folded portion 120 includes a vertical portion 426 bent approximately 90 degrees from the decorative surface portion 110 toward the back side, an eaves-side insertion portion 124 bent approximately 90 degrees further toward the ridge side (the side where the eaves-side insertion portion 124 is approximately horizontal) from the vertical portion 426, and an eaves-side hemmed portion 322.

[0075] The ridge-side insertion portion 130 is similar to the repair roofing material 300 according to the third embodiment described above in that its edges are not hemmed. The hemming process on the underside of the edge of the eaves-side folded portion 120 (eaves-side hemmed portion 322) is similar to the eaves-side hemmed portion 322 of the renovation roofing material 300 according to the third embodiment described above, in that it is formed in a folded shape.

[0076] The roof material hemmed portion 402 is similar to that of the repair roof material 200 according to the second embodiment described above in that the roof material hemmed portion 202 is formed by hemming both ends in the longitudinal direction (direction perpendicular to the eaves and ridge direction (left-right direction: girder direction)) of the repair roof material 200. However, the roof material hemmed portion 202 of the repair roof material 400 according to this fourth embodiment is formed in a folded shape, whereas the roof material hemmed portion 402 of the repair roof material 400 according to this fourth embodiment is formed in a folded shape, as shown in Figure 17(A).

[0077] As described above, in the existing roof that has been constructed, the construction structure using the renovation roofing material 400 is completed by installing the renovation roofing material 400 so as to cover (cover) the decorative slate 1000 without removing the decorative slate 1000. In this case, the renovation roofing material 400 according to this embodiment is installed in combination with the joint sacrificial plate 350. Then, on the existing roof constructed with decorative slate 1000, as shown in Figures 16 and 18 to 20, the renovation roofing material 400 and joint sacrificial plate 350 are installed on top of the existing decorative slate 1000, with the joint sacrificial plate 350 installed from below so as to cover the gaps between the renovation roofing materials 400 that are installed in the girder direction before covering the decorative slate 1000, and then the renovation roofing material 400 is installed.

[0078] In other words, in the third embodiment, the roof repair material 300 covers the gaps between adjacent roof repair materials 300 in the girder direction from below by installing a joint sacrificial plate 350 on the underside of the roof repair material 300, where both ends in the longitudinal direction (girder direction) are not hemmed. In contrast, in the fourth embodiment, the roof repair material 400 covers the gaps between adjacent roof repair materials 400 in the girder direction from below by installing a joint sacrificial plate 350 on the underside of the roof repair material 400, where both ends in the longitudinal direction (girder direction) are hemmed (folded shape) and both ends in that direction are not hemmed.

[0079] Focusing on this difference, the roof repair material 400 and joint flashing plate 350 according to this embodiment will be described with reference to Figure 17. Comparing Figure 17 with Figures 2, 7, and 12, the roof repair material 400 according to this embodiment (which is not provided by the roof repair material 100 according to the first embodiment or the roof repair material 300 according to the third embodiment, but is provided by the roof repair material 200 according to the second embodiment) has hemmed roof material hemming portions 402 on both ends in the girder direction. In this respect, both ends in the girder direction are hemmed, which is common with the roof repair material 200 according to the second embodiment, but the difference is that its shape is folded rather than looped. The joint sacrificial plate 350 hidden on the underside of the roof repair material 400 is the same as in the third embodiment.

[0080] Furthermore, a water drainage portion 428 is formed on the surface side between the decorative surface portion 110 and the eaves-side folded portion 120. As described above, this water drainage portion 428 is realized by one recess (valley-fold bend shape) which is a means of controlling water flow, in addition to one mountain fold formed further towards the eaves, as shown in Figure 17(A). For this reason, the eaves-side folded portion 120 consists of a vertical portion 426 bent approximately 90 degrees from the decorative surface portion 110 toward the back side, and an eaves-side insertion portion 124 bent approximately 90 degrees further toward the ridge side (the side where the eaves-side insertion portion 124 is approximately horizontal) from the vertical portion 426. It includes 24 and a hemmed section 322 on the eaves side.

[0081] Regarding the materials, the roof repair material 400 is the same as the roof repair material 100, roof repair material 200, or roof repair material 300 (the joint sacrificial plate 350 is common to the third and fourth embodiments), and thin metal sheets (thickness approximately 0.3 mm to 0.4 mm), such as aluminum-zinc alloy plated steel sheets, are used for these. In this case, the valley fold and mountain fold bending shape, which consists of one recess and one protrusion and is an example of a water flow control means, is different from the bellows fold shape common to the roof repair material 100 according to the first embodiment and the roof repair material 200 according to the second embodiment. The depth of the mountain fold and valley fold shown in Figure 17, which realizes this valley fold and mountain fold bending shape, is approximately 0.35 mm to 0.5 mm (it is natural that this satisfies the roof slope α of the existing roof shown in Figure 19(D) > inclination angle δ of the eaves side slope), which is the same as in the first, second, and third embodiments. The slight protrusions (peaks) caused by these mountain folds and the slight recesses (valleys) caused by these valley folds are virtually shown in Figure 17, with mountain folds represented by solid lines and valley folds by dashed lines, and in Figures 16 and 18, both are represented by solid lines.

[0082] Regarding the construction structure, when the renovation roofing material 400 is installed to cover the existing decorative slate 1000 roofing material, as shown in Figure 19, the edge of the ridge-side insertion portion 130 of the renovation roofing material 400 (without ridge-side hemming) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemming 322, which has a folded shape). In other words, as shown in Figure 19(B), the edge of the ridge-side insertion portion 130 of the renovation roofing material 400 (here, the eaves-side renovation roofing material 400D) (without ridge-side hemming) is positioned closer to the ridge than the edge of the eaves-side folded portion 120 (eaves-side hemming 322, which has a folded shape) of the renovation roofing material 400 (here, the ridge-side renovation roofing material 400U) one ridge away from the eaves-side renovation roofing material 400D. The renovation roofing materials 400 are installed so that their relative positions in the ridge direction are as shown. Before installing the renovation roofing materials 400 in the girder direction, joint flashing plates 350 (in this case, eaves joint flashing plates 350D) are installed on the underside of the renovation roofing materials 400 after installation, so as shown in Figure 19(B), the joint flashing plates 350 (in this case, eaves joint flashing plates 350D) are positioned below the ridge-side insertion portion 130 of the renovation roofing material 400 (in this case, eaves-side renovation roofing material 400D) and below the eaves-side folded portion 120 of the renovation roofing material 400 one ridge away from the eaves-side renovation roofing material 400D (in this case, ridge-side renovation roofing material 400U), so as to cover the gaps between adjacent renovation roofing materials 400 in the girder direction from below. Figure 19(B) shows the state in which the ridge-side joint flashing 350U is directly positioned below the ridge-side repair roofing material 400U (in the order from the surface side: repair roofing material 400, joint flashing 350, and decorative slate 1000).

[0083] Here, for the outermost part of the roof in the direction of the eaves and ridge, as shown in Figure 19(A), the eaves-side folded portion 120 of the refurbished roofing material 400 may not cover the starter 1050 (to match the roof slope) but only cover the decorative slate 1000. Alternatively, as shown in Figure 19(E), instead of the refurbished roofing material 400, a refurbished roofing material 490 may be used, which has a vertical portion 496 that is extended by the thickness of the starter 1050 by the vertical portion 426 of the eaves-side folded portion, so that the eaves-side folded portion covers the starter 1050 and the decorative slate 1000.

[0084] Further features of this renovation roofing material 400 will be explained with reference to Figure 19(C), which emphasizes the recessed area that serves as a water flow control means. As shown in Figure 19(C), the eaves-side folded portion 120 of this renovation roofing material 400 consists of a vertical portion 426 bent approximately 90 degrees from the decorative surface portion 110 toward the back side, an eaves-side insertion portion 124 bent approximately 90 degrees further toward the ridge side (the side where the eaves-side insertion portion 124 is approximately horizontal), and an eaves-side hemming portion 322 The features described above are as follows. In addition, the features satisfy H(2)>H(1) and the fact that the portion 434 on the decorative surface 110 and the eaves-side insertion portion 124 are parallel. These features reduce resistance when inserting into the decorative slate.

[0085] • Effects and Actions As described above, the roof repair material 400 and the construction structure using the same according to the embodiment of the present invention also produce the effects (7) to (11) described above. Furthermore, the effects (7) are as follows: In the renovation roofing material 400 as well, a water flow control means is formed on the decorative surface 110. As an example of this water flow control means, a recess is formed on the decorative surface 110 in a direction approximately perpendicular to the eaves and ridge direction (left-right direction: girder direction). This recess is formed by a valley-fold bend shape in which the recess consists of only one eaves-side slope (and further includes a mountain fold to form a water drainage section 428). As shown in Figure 19(D), the inclination angle δ(deg) of the eaves-side slope is less than the roof slope α(deg) of the existing roof.

[0086] As a result, the recess, which is an example of a water flow control means, prevents rainwater from accumulating in the recess (because the slope of the eaves side is always less than horizontal and never greater than horizontal), allowing rainwater to flow in the direction of the girder, thus averaging the flow rate of rainwater from the ridge to the eaves in the direction of the girder. The meaning of being able to average is as described above. Furthermore, the shape of this recess allows for the visibility of valley-bend lines at a fixed pitch (equivalent to the working length in the direction of the eaves and ridge) in the direction of the eaves and ridge, as well as the visibility of mountain-bend lines for forming the water drainage section 428, thereby improving the aesthetic appeal of the renovation roofing material 400 and improving the strength of the renovation roofing material 400.

[0087] Furthermore, as shown in Figure 19(B), a small space is formed between the back surface of the fold of the renovation roofing material 400 and the surface of the decorative slate 1000. This makes it difficult for capillary action to occur in the infiltrating rainwater, allowing the rainwater to be smoothly guided to the drainage holes and improving drainage. Furthermore, the renovation roofing material 400 provides the same effects and benefits as the renovation roofing material 200 equipped with roofing material hemming sections 202 of different shapes. (12) Both ends of the vertical (longitudinal (girder)) edge in the eaves direction are hemmed to the back side (roofing material hemmed section 402, the shape is folded).

[0088] This makes it less likely for the roofing material 400 to deform when installed, even if the edges of the roofing material 400 in the direction of the beam are strongly struck with a hammer or mallet for alignment purposes. Furthermore, the renovation roofing material 400 exhibits the following effects in addition to those mentioned above. (13) As shown in Figure 19(C), H(2) > H(1) is satisfied, and the portion 434 on the decorative surface 110 and the eaves-side insertion portion 124 are parallel.

[0089] These features reduce resistance when inserting the slate into the decorative slate. Thus, according to the renovation roofing material 400 and the construction structure using the same in this embodiment, it is possible to provide a renovation roofing material that is installed to cover existing thin-plate shaped roofing materials that are installed in a stepped manner in the eaves-ridge direction, and that can average the flow rate of rainwater in the direction perpendicular to the eaves-ridge direction (left-right direction), and a construction structure using the renovation roofing material. A modified example applicable to the above-described embodiment will be explained in detail below.

[0090] <First variation> The above-described roof repair material 100 according to the first embodiment, roof repair material 200 according to the second embodiment, roof repair material 300 according to the third embodiment, and the fourth embodiment relate to the above-described roof repair material 100 according to the first embodiment, roof repair material 200 according to the second embodiment, roof repair material 300 according to the third embodiment, and the fourth embodiment. A common modification of the roofing material 400 for renovation will be explained below with reference to Figure 21.

[0091] The first modified example shown in Figure 21 is a modified example of the flashing portion 128 formed on the surface side between the decorative surface portion 110 and the eaves-side folded portion 120. While the flashing portion 128 shown in Figure 21(A) has a chamfered shape with a vertical portion 126 at 30 degrees (it may be 45 degrees as in the flashing portion 228 or 60 degrees as in the flashing portion 328), the flashing portion 528 of the renovation roofing material 500 shown in Figure 21(B) has a chamfered shape with a bevel of approximately 90 degrees at the tip and no vertical portion, and the flashing portion 628 of the renovation roofing material 600 shown in Figure 21(C) has a chamfered shape with an arc shape at the tip and no vertical portion.

[0092] Neither the flashing portion 528 of the refurbished roofing material 500 nor the flashing portion 628 of the refurbished roofing material 600 has a vertical portion 126 that follows the flashing portion 128 of the refurbished roofing material 100 (nor the vertical portion 426 of the refurbished roofing material 400). Therefore, when inserting the refurbished roofing material on the ridge side by tapping a piece of wood or the like against the tip of this eaves-side folded portion, the eaves-side folded portion spreads outwards, causing the refurbished roofing materials to brace against each other, which effectively prevents the refurbished roofing materials from coming loose after installation.

[0093] <Second variation> A second modified example common to the roof repair material 100 according to the first embodiment and the roof repair material 200 according to the second embodiment described above will be explained below with reference to Figure 22. The modified example shown in Figure 22 is a modified example of a water flow control means formed on the decorative surface portion 110. While Figure 22(A) shows a water flow control means with a bellows-fold shape, Figure 22(B) shows a water flow control means with a shape in which the slope of the peaks and the slope of the valleys are different and the width ratio is changed, and Figure 22(C) shows a water flow control means with a shape in which the bending ratio is changed on the eaves side and the ridge side by changing the pitch. In this water flow control means shown in Figure 22(C), the orientation shown for the eaves side and the ridge side is preferable. With this orientation, the curvature of the ridge side is small and the ridge side is closer to a straight line than the eaves side, making it easy to insert into the ridge side when installing from the ridge side to the eaves side.

[0094] Furthermore, the water flow control means shown in Figure 22(D) is a water flow control means with a wave shape, the water flow control means shown in Figure 22(E) is a water flow control means with a partial mountain shape, the water flow control means shown in Figure 22(F) is a water flow control means with a partial trapezoid shape, and the water flow control means shown in Figure 22(G) is a water flow control means with a partial curved surface shape. The water flow control means shown in Figures 22(B) to 22(G) can achieve the same effects as the water flow control means shown in Figure 22(A). Furthermore, since various shapes can be used for the water flow control means, the aesthetic appeal of the decorative surface can be improved.

[0095] <Third variation> Modifications common to the roof repair material 100 according to the first embodiment, the roof repair material 200 according to the second embodiment, the roof repair material 300 according to the third embodiment, and the roof repair material 400 according to the fourth embodiment described above will be explained below with reference to Figure 23. Although Figure 23 shows a modification of the roof repair material 400, it can also be applied to the other roof repair materials 100, 200, and 300.

[0096] The modified example shown in Figure 23(A) is one in which the eaves-side folded-over portion 120 of the refurbished roofing material 700 is formed by a horizontal portion 724A and a folded portion 724B. Specifically, the eaves-side hemmed portion 322 is bent downwards from the middle of the eaves-side insert portion 124 to form the folded portion 724B. By providing a bent portion 724B in the eaves-side folded portion 120 in this way, resistance when inserting it into the decorative slate can be reduced, improving workability.

[0097] In the modified example shown in Figure 23(B), the eaves-side folded portion 120 of the roofing material 800 for renovation also has the aforementioned folded portion 724B, but the horizontal portion 724A is bent downwards at approximately the center to form slopes 824A1 and 824A2. In other words, the horizontal portion 724A is formed in a roughly V-shape. By forming the horizontal portion 724A in a V-shape at the eaves-side folded portion 120 in this manner, resistance during insertion into the decorative slate can be reduced, improving workability. Furthermore, as shown in Figure 23(C), the construction structure of the renovation roofing material 800 for existing roofs allows for the formation of an air layer AS, which effectively prevents rainwater from entering the building due to capillary action.

[0098] <Other variations> A modified example of the roof repair material 300 according to the third embodiment described above will be explained below with reference to Figure 24, and a modified example of the roof repair material 400 according to the fourth embodiment will be explained below with reference to Figure 25. The modified examples shown in Figures 24 and 25 are modified examples in which a water flow control means for controlling the flow in the eaves-ridge direction is formed on the ridge-side portion of the valley-bend shape of the decorative surface 110. This water flow control means for controlling the flow in the eaves-ridge direction comprises a plurality of patterns 311 and 411 that are generally continuous in the eaves-ridge direction of the decorative surface 110 and arranged in parallel in the girder direction. By creating a flow in the eaves-ridge direction to prevent rainwater from flowing through the gap between two repair roofing materials 300 and 400 arranged side by side in the girder direction, and by repeatedly averaging the flow rate of rainwater in the direction perpendicular to the eaves-ridge direction (left-right direction) by the eaves-side slopes that exist at a fixed pitch (equivalent to the working length in the eaves-ridge direction), a more favorable rainwater flow is made easier to achieve.

[0099] This means of controlling water flow in the direction of the eaves and ridge is realized by the patterns 311 and 411 described above, but it is not limited to any method that can control the flow of rainwater by forming recesses or protrusions on the decorative surface. It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

[0100] For example, although not specifically shown in the illustrations, the combination of whether or not hemming is applied to both ends of the roofing material in the direction of the beam, and whether or not hemming is applied to both ends of the joint cover and joint sill plate, is not limited to the embodiments described above, and the choice of whether or not to use a joint cover or joint sill plate can be freely selected from design and other considerations. Furthermore, the water flow control means (both in the girder direction and the eaves direction) provided in the roof repair material according to the present invention is not limited to the above-described embodiment, and is acceptable as long as it can control the flow of rainwater (even to some extent, or more specifically, average it out) by forming recesses or protrusions on the decorative surface. [Industrial applicability]

[0101] The present invention is preferable to a roof repair material and construction structure using the same that can repair an existing roof without removing the existing roofing material, and is particularly preferable to a roof repair material and construction structure using the same that is installed to cover existing thin-plate roofing material that is installed in a stepped manner overlapping in the eaves-ridge direction. [Explanation of Symbols]

[0102] 100 Roofing material for renovation (first embodiment) 150 Joint Cover 200 Roofing material for renovation (second embodiment) 250 Joint sacrificial plate 300 Roofing material for renovation (third embodiment) 350 Joint sacrificial plate 400 Roofing material for renovation (fourth embodiment) 1000 Decorative slate (existing roofing material) 3000 Decorative slate (existing roofing material) 1002 Roof nails (existing) 1010 Rafters (existing) 1020 Roof sheathing (existing) 1030 Underlayment (existing) 1040 Eaves flashing (existing) 1050 Starter (existing) 1060 Gable flashing (existing) 1070 Ceiling

Claims

1. A roofing material for renovating an existing roof in which thin, sheet-shaped existing roofing materials are installed by overlapping them in a stepped manner in the direction of the eaves and ridge, The ridge-side insertion part, the decorative surface part, and the eaves-side folded-over part are formed integrally. The decorative surface portion has a bellows-fold shape with two or more repeating shapes formed from mountain folds and valley folds, including two slopes, an eaves-side slope and a ridge-side slope. Two or more recesses formed by the valley folds in the bellows-fold shape, wherein two or more recesses aligned substantially perpendicular to the eaves-ridge direction are formed on the decorative surface as a water flow control means. The slope from the bend to the valley bend on the eaves side is uniform, and the slope from the valley bend to the bend on the ridge side is uniform. A roofing material for renovation, characterized in that the two slopes, the eaves-side slope and the ridge-side slope, are present across the entire decorative surface.

2. A roofing material for renovating an existing roof in which thin, sheet-shaped existing roofing materials are installed by overlapping them in a stepped manner in the direction of the eaves and ridge, The ridge-side insertion part, the decorative surface part, and the eaves-side folded-over part are formed integrally. Near the eaves-side end of the decorative surface, there is a single eaves-side upward slope that separates upward from the flat surface by a valley bend provided at the eaves-side end of the flat surface, extending from the ridge side to the eaves side. The aforementioned upward slope on the eaves side is provided with a bent section at the eaves side end, and one downward slope on the eaves side is provided from the bent section towards the eaves side. The eaves-side end of the aforementioned sloping eaves is connected to a vertical section that is bent approximately 90 degrees from the decorative surface towards the back side. The decorative surface portion has a recess formed in a direction substantially perpendicular to the eaves and ridge direction by the valley bend portion. In the decorative surface, the recess is located near the eaves in the direction of the ridge, as a water flow control means. A roofing material for renovation, characterized in that no recess is formed on the ridge side of the aforementioned recess.

3. The roofing material for renovation according to claim 2, characterized in that the eaves-side upward slope and the eaves-side downward slope are positioned substantially symmetrically with respect to the mountain-bend portion as a line of symmetry.

4. The roofing material for renovation according to claim 1, characterized in that the angle of inclination of the eaves-side slope is less than the roof pitch of the existing roof.

5. A roofing material for renovation according to any one of claims 1 to 4, characterized in that a water drain is formed on the surface side between the decorative surface and the eaves-side folded portion.

6. The roofing material for renovation according to any one of claims 1 to 5, characterized in that the edge of the folded-over portion on the eaves side is hemmed to the back side or the front side.

7. The roofing material for renovation according to any one of claims 1 to 6, characterized in that both ends of the vertical direction in the eaves-ridge direction are hemmed toward the back side.

8. The roofing material for renovation according to claim 1, characterized in that the edge of the ridge-side insertion portion is hemmed to the back side or the front side.

9. A construction structure for roofing materials used to renovate an existing roof, in which thin, existing roofing materials are installed by overlapping them in a stepped manner in the direction of the eaves and ridge, The aforementioned roofing material for renovation has a ridge-side insertion portion, a decorative surface portion, and an eaves-side folded portion formed integrally. The decorative surface portion is formed with a water flow control means provided for the roof repair material according to any one of claims 1 to 8. The edge of the folded-over portion on the eaves side is hemmed. A construction structure for roof repair materials, characterized in that, during construction, the edge of the ridge-side insertion portion is positioned closer to the ridge than the edge of the eaves-side folded portion.

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