Roof repair structure and method of construction

Abstract

To ensure ventilation performance and drainage performance inside a side wall in a roof repair structure.SOLUTION: A roof repair structure comprises: a newly installed roof material 20 installed on an existing roof material 10; a ventilation member 30 installed on an existing wall draining plate 16 in a connection part of at least one of an upper edge and a side edge of the newly installed roof material 20 and a side wall 14; and a newly installed wall draining plate 50 installed so as to cover the ventilation member 30. The ventilation member 30 is arranged so as to communicate with a side wall ventilation layer 17 opened at a lower end of the side wall 14. Furthermore, the roof repair structure comprises a supporting member 40 installed on the existing wall draining plate 16 and supporting the newly installed wall draining plate 50. The ventilation member 30 and the supporting member 40 are arranged along at least one of the upper edge and the side edge of the newly installed roof material 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a roof repair structure formed by modifying Existing roof and a construction method thereof.

Background Art

[0002] As a method for repairing an existing roof using a decorative slate roof, there is known a "cover method" in which the existing decorative slate roof is left intact and a new roof is laid on top of it (see, for example, Non-Patent Document 1 and Patent Document 1). In the cover method, an adhesive underlay material is laid on top of the existing roof material, and a new roof material is installed. At the joint portion with the outer wall (side wall) on the water surface or side of the pitched roof, a new subfloor is provided on top of the existing wall drip plate, and a new wall drip plate is installed so as to cover this subfloor.

Prior Art Documents

Patent Documents

[0003]

Non-Patent Document 1

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the repair method of Non-Patent Document 1, although waterproof performance is ensured, ventilation performance of the side wall is not ensured. It is not preferable that the ventilation performance of the side wall, which was ensured in the newly installed roof structure, is lost after the repair.

[0006] Therefore, an object of the present invention is to provide a roof repair structure and a construction method thereof that can ensure ventilation performance and drainage performance inside the side wall. [Means for solving the problem]

[0007] The first part of the present invention, which solves the aforementioned problems, is a roof repair structure comprising: a new roofing material installed on top of an existing roofing material; a ventilation member installed on top of an existing wall flashing at the interface between the upper edge and the side edge of the new roofing material and a side wall; and a new wall flashing installed so as to cover the ventilation member, wherein the ventilation member is arranged in communication with a side wall ventilation layer that opens at the lower end of the side wall.

[0008] According to the roof repair structure of the present invention, ventilation performance can be ensured inside the side wall through the ventilation member. In this specification, "ventilation performance" means that a certain amount of air inside the side wall can be discharged to the outside, and that air can be drawn in and expelled (suction and discharge) between the inside and outside of the side wall. Furthermore, drainage performance can be ensured to drain water that has penetrated into the side wall through the ventilation member. In addition, since the new roofing material is installed on top of the existing roofing material, waterproofing performance can also be ensured.

[0009] In the roof repair structure of the present invention, it is preferable that a support member is further provided, which is installed on the existing wall flashing and supports the newly installed wall flashing, and that the ventilation member and the support member are arranged along at least one of the upper edge and side edge of the newly installed roofing material. With such a configuration, the newly installed wall flashing can be easily fixed while ensuring ventilation performance.

[0010] In the roof repair structure of the present invention, the ventilation member and the support member have the same rectangular cross-sectional shape, and the newly installed wall flashing plate has a rising plate portion that rises along the side wall in contact with the existing roofing material, a top plate portion that covers the upper surfaces of the ventilation member and the support member, and an end plate portion that covers the end surface of the ventilation member and the support member on the newly installed roofing material side, and preferably the end plate portion has ventilation holes connected to the ventilation member. With such a configuration, air that has passed through the ventilation member can be efficiently drawn in and discharged to the outside through the ventilation holes, thus improving ventilation performance.

[0011] In the roof repair structure of the present invention, the ventilation holes preferably have a horizontally elongated slit shape and are positioned at an interval above the lower end of the end plate portion. With such a configuration, rainwater is less likely to penetrate from the ventilation holes into the interior of the newly installed flashing plate.

[0012] In the roof repair structure of the present invention, the ventilation member and the support member have the same rectangular cross-sectional shape, and the newly installed wall flashing plate has a rising plate portion that rises along the side wall against which the existing roofing material abuts, a top plate portion that covers the upper surfaces of the ventilation member and the support member, and an end plate portion that covers the end faces of the ventilation member and the support member on the newly installed roofing material side, and it is preferable that a predetermined clearance is formed between the end face of the existing wall flashing plate on the existing roofing material side and the end plate portion, and that the clearance becomes a ventilation space connected to the ventilation member. With such a configuration, the air that has passed through the ventilation member can be efficiently discharged to the outside from the ventilation space, so that the ventilation performance is improved.

[0013] In the roof repair structure of the present invention, it is preferable that the ventilation member comprises a plurality of support parts that support the load of the newly installed wall flashing and a ventilation space formed between the support parts. With such a configuration, the newly installed wall flashing can be easily fixed in place.

[0014] In the roof repair structure of the present invention, it is preferable that waterproof double-sided tape is laid on the surface of the existing wall flashing. With this configuration, the ventilation member and the support member can be easily bonded to the surface of the existing wall flashing, and when the new wall flashing is fixed to the support member and the existing wall flashing with screws, the waterproof double-sided tape enters the screw holes of the existing wall flashing, thereby ensuring watertightness.

[0015] A second aspect of the present invention, which solves the aforementioned problems, is a roof repair structure comprising: a new roofing material installed on top of an existing roofing material; a ventilation member installed on top of the existing roofing material at the interface between the upper edge and the side edge of the new roofing material and a side wall; and a new wall flashing plate installed so as to cover the ventilation member, wherein the ventilation member is arranged in communication with a side wall ventilation layer that opens at the lower end of the side wall.

[0016] According to the roof repair structure of the present invention, similar to the roof repair structure of claim 1, ventilation performance and drainage performance inside the side wall can be ensured through the ventilation member. Furthermore, since the new roofing material is installed on top of the existing roofing material, waterproofing performance can also be ensured.

[0017] A third aspect of the present invention, which solves the aforementioned problems, is a new roof installation step in which new roofing material is installed on top of existing roofing material, and at the interface between at least one of the upper edge and side edge of the new roofing material and the side wall, on top of the existing wall flashing plate. Waterproof double-sided tape The method for constructing a roof repair structure is characterized by comprising: a step of laying double-sided tape; a step of installing a ventilation member on top of the waterproof double-sided tape, which is capable of allowing air to pass through and a support member that supports the new wall flashing; and a step of installing the new wall flashing so as to cover the ventilation member and the support member, and fixing the new wall flashing to the support member and the existing wall flashing with screws.

[0018] According to the construction method of the roof repair structure of the present invention, ventilation and drainage performance can be ensured inside the side wall through the ventilation member. Furthermore, since the new roofing material is installed on top of the existing roofing material, waterproofing performance can also be ensured. In addition, the ventilation member can be adhered to the surface of the existing wall flashing with waterproof double-sided tape, and when the new wall flashing is fixed to the ventilation member and the existing wall flashing with screws, the waterproof double-sided tape enters the screw holes of the existing wall flashing, thus ensuring watertightness.

[0019] The fourth invention for solving the above problems includes an excision step of excising the tip of an existing wall drip plate in the engagement between at least one of the upper edge and the side edge of an existing roofing material and a side wall portion, a removal step of removing the base under the existing wall drip plate, a new roofing installation step of installing a new roofing material on the existing roofing material excluding the edge portion, and in the engagement between at least one of the upper edge and the side edge of the new roofing material and the side wall portion, Waterproof double-sided tape a double-sided tape laying step of laying Waterproof double-sided tape on the existing roofing material of the edge portion, a ventilation member installation step of installing a ventilation member through which air can pass and a support member for supporting a new wall drip plate, and a new wall drip plate installation step of installing the new wall drip plate so as to cover the ventilation member and the support member and fixing the new wall drip plate to the support member with screws. It is a construction method of a roof repair structure characterized by comprising these steps.

[0020] According to the construction method of the roof repair structure of the present invention, similar to the construction method of the roof repair structure of claim 9, the ventilation performance and drainage performance inside the side wall can be ensured through the ventilation member. Also, since a new roofing material is installed on the existing roofing material, waterproof performance can be ensured. Furthermore, the ventilation member can be adhered to the surface of the existing roofing material with a waterproof double-sided tape.

Effect of the Invention

[0021] According to the roof repair structure and its construction method according to the present invention, the ventilation performance and drainage performance inside the side wall can be ensured. Furthermore, in addition to the ventilation performance, the drainage performance of the water that has penetrated inside the side wall can also be ensured.

Brief Description of the Drawings

[0022] [Figure 1] It is a partially broken perspective view showing the roof repair structure according to the first embodiment of the present invention. [Figure 2] It is a cross-sectional view of the roof repair structure according to the first embodiment of the present invention seen from the girder direction. [Figure 3] It is a cross-sectional view of the roof repair structure according to the first embodiment of the present invention seen from the flow direction. [Figure 4] This is a perspective view showing the ventilation member and support member of a roof repair structure according to the first embodiment of the present invention. [Figure 5] A perspective view showing a newly installed wall flashing plate in a roof repair structure according to the first embodiment of the present invention. [Figure 6] (a) is a cross-sectional view showing the existing roofing material, and (b) is a cross-sectional view showing the state in which the repair adhesive underlayment has been laid during the new roof installation process of the roof repair structure construction method according to the first embodiment of the present invention. [Figure 7] (a) is a cross-sectional view showing the state after the new roofing material has been laid during the new roof installation process of the roof repair structure construction method according to the first embodiment of the present invention, and (b) is a cross-sectional view showing the double-sided tape laying process. [Figure 8] (a) is a cross-sectional view of a section passing through a support member in a cross-section showing the installation of a ventilation member in a method for constructing a roof repair structure according to the first embodiment of the present invention, and (b) is a cross-sectional view of a section passing through a ventilation member in a cross-section showing the installation of a ventilation member. [Figure 9] This is a cross-sectional view showing the state after the installation of the new wall flashing plate in the new wall flashing plate installation step of the roof repair structure construction method according to the first embodiment of the present invention. [Figure 10] This is a cross-sectional view of a roof repair structure according to a second embodiment of the present invention, as seen from the girder direction. [Figure 11] This is a cross-sectional view of a roof repair structure according to the second embodiment of the present invention, as seen from the direction of flow. [Figure 12] (a) is a perspective view showing a first modified example of the new wall flashing, (b) is a cross-sectional view, and (c) is a perspective view showing a second modified example of the new wall flashing. [Figure 13] This is a cross-sectional view from the girder direction of a roof repair structure using a modified ventilation member. [Figure 14] (a) is a cross-sectional view showing the cutting step of the manufacturing method of a modified roof repair structure according to the first embodiment of the present invention, and (b) is a cross-sectional view of the modified roof repair structure seen from the girder direction. [Figure 15] This is a cross-sectional view from the girder direction of a roof repair structure using a ventilation member according to the second modified example. [Figure 16]This is a cross-sectional view from the girder direction of a roof repair structure using a ventilation member according to the third modified example. [Modes for carrying out the invention]

[0023] A roof repair structure and its construction method according to the first embodiment of the present invention will be described in detail with reference to the drawings. First, the configuration of the roof repair structure will be described. The roof repair structure according to this embodiment is a repair structure in which new roofing material is installed while the existing roofing material is left in place. As shown in Figures 1 to 3, the roof repair structure 1 comprises new roofing material 20 installed on top of the existing roofing material 10, a ventilation member 30, a support member 40, a new wall flashing plate 50, and a connecting flashing plate 60.

[0024] The existing roofing material 10 consists of boards constructed before the renovation, laid in multiple pieces on top of roof sheathing 11 installed on rafters (not shown), with underlayment 12 in between. The existing roofing material 10 is fixed to the roof sheathing 11 with nails. The underlayment 12 extends to the surface of the substrate 14a of the side wall 14 and rises to a predetermined height along the substrate 14a. Specifically, the rise dimension of the underlayment 12 is about 200 mm, and it rises about 50 mm higher than the upper end of the rise portion 16a of the existing wall flashing 16, which will be described later. At the upper and side edges of the existing roofing material 10 in the direction of water slope, coping 15 is laid at the junction with the side wall 14, and the existing wall flashing 16 is installed on top of coping 15. The rising portion 16a at the upper end of the existing wall flashing 16 is positioned inside the base vertical members 14c of the surface panel material 14b of the side wall 14. The base vertical members 14c are arranged on the back side of the surface panel material 14b at predetermined intervals. The space between adjacent base vertical members 14c is a side wall ventilation layer 17 (see Figure 1) that extends vertically inside the side wall 14. The side wall ventilation layer 17 opens downwards at the lower end of the side wall 14.

[0025] The new roofing material 20 is a board material that is newly installed on top of the existing roofing material 10 that is left in place and not removed. Multiple sheets of the new roofing material 20 are laid on top of the existing roofing material 10 via a repair adhesive underlayment 21. The repair adhesive underlayment 21 is composed of an adhesive layer and release paper on the back of the underlayment, and the release paper is peeled off during installation. Existing roofing materials It is attached to 10. The refurbished adhesive underlayment 21 is laid from the surface of the existing roofing material 10 to the surface of the existing wall flashing 16. The new roofing material 20 is adhered to the existing roofing material 10 with the refurbished adhesive underlayment 21 and is also fixed to the existing roofing material 10 with nails. The new roofing material 20 may also be laid via an underlayment that does not have an adhesive layer, without using the adhesive refurbished adhesive underlayment 21. The upper edge (hereinafter sometimes referred to as the "upper edge") and side edges of the new roofing material 20 in the direction of the water slope extend to the vicinity of the vertical plate portion 16c that is continuous with the tip of the horizontal plate portion 16b of the existing wall flashing 16. Sealing material 22 is laid on the surface of the upper edge and side edges of the new roofing material 20. The sealing material 22 is an irregularly shaped sealant that covers the upper and side edges of the new roofing material 20 and the vertical plate portion 16c of the existing wall flashing 16, and is provided along the longitudinal direction of the vertical plate portion 16c. The sealing material 22 is provided to fill the gap between the vertical plate portion 16c of the existing wall flashing 16 and the new roofing material 20.

[0026] The ventilation member 30 is a member that allows air inside the side wall 14 to vent to the outside. The ventilation member 30 is made of a three-dimensional mesh structure plate-like member made of resin, and the hollow section allows continuous ventilation in all directions (up, down, front, back, left, and right). The ventilation member 30 is, for example, flexible and is unfolded and laid from a rolled-up storage state. The ventilation member 30 is installed on the existing wall flashing plate 16 at the interface between the upper edge (see Figure 2) and side edge (see Figure 3) of the new roofing material 20 in the direction of water slope and the side wall 14. The ventilation member 30 has a long rectangular parallelepiped shape that extends in the longitudinal direction of the existing wall flashing plate 16 (see Figure 4), and multiple members are laid at predetermined intervals along the longitudinal direction of the existing wall flashing plate 16. The ventilation member 30 is laid on the upper surface of the portion of the horizontal plate portion 16b of the existing wall flashing plate 16 that is closer to the tip and protrudes outward from the surface plate material 14b of the side wall 14, and is arranged in communication with the side wall ventilation layer 17 that opens at the lower end of the side wall 14.

[0027] The support member 40 is a member that supports the newly installed wall flashing 50 and is made of block-shaped wood. As shown in Figure 4, the cross-sectional shape of the support member 40 is the same as the cross-sectional shape of the ventilation member 30 and is placed between the ventilation members 30, 30 which are spaced apart. In other words, the ventilation members 30 and the support member 40 are alternately placed on the newly installed wall flashing 50 which is provided along the upper and side edges of the newly installed roofing material 20. Note that the arrangement of the ventilation members 30 and the support member 40 is not limited to alternating one at a time. Multiple identical members may be placed side by side, or multiple members of one type may be placed side by side with a single member of the other type in between. In addition, in this embodiment, the cross-sectional shape of the support member 40 is the same as the cross-sectional shape of the ventilation member 30, but this is not limited to this, and the cross-sectional shapes of the support member 40 and the ventilation member 30 may be different. For example, the cross-sectional shape of the ventilation member 30 may be smaller than the cross-sectional shape of the support member 40. The ventilation member 30 and the support member 40 are temporarily fixed to the existing wall flashing 16 via waterproof double-sided tape 31 laid on the horizontal plate portion 16b of the existing wall flashing 16. The support member 40, which is provided on the new wall flashing 50 installed along the side edge of the new roofing material 20, preferably has a side surface 41 that is on the upper side of the water slope that slopes downstream as it moves away from the side wall 14 (see Figure 4). This prevents water that has flowed into the ventilation member 30 from flowing towards the side wall 14. However, the side surface 41 of the support member 40 that is on the upper side of the water slope may not be sloped.

[0028] As shown in Figures 1 to 3, the newly installed wall flashing 50 is a flashing material that covers the ventilation member 30 and the support member 40 above the existing wall flashing 16, and directs water flowing on the surface of the side wall 14 onto the newly installed roofing material 20. As also shown in Figure 5, the newly installed wall flashing 50 is formed by bending a metal plate and has a rising plate portion 51, an upper plate portion 52, and an end plate portion 53.

[0029] The rising plate portion 51 is the part that fixes the newly installed wall flashing plate 50 to the side wall 14, rising along the surface plate material 14b of the side wall 14 and fixing in contact with the lower end of the surface plate material 14b. A lip portion 54 is formed at the upper end of the rising plate portion 51, projecting in a direction away from the side wall 14. Note that the newly installed wall flashing plate 50 may have a shape without the lip portion 54 at the upper end of the rising plate portion 51.

[0030] The top plate portion 52 is the part that covers the upper surfaces of the ventilation member 30 and the support member 40. The top plate portion 52 is formed continuously with the lower end of the riser plate portion 51 and is bent toward the new roofing material 20 relative to the riser plate portion 51. The top plate portion 52 of the new wall flashing plate 50 provided on the upper edge of the new roofing material 20 is bent at an obtuse angle with respect to the riser plate portion 51, and the tip is inclined diagonally downward (see Figure 2). The top plate portion 52 of the new wall flashing plate 50 provided on the side edge of the new roofing material 20 is bent at a right angle with respect to the riser plate portion 51 (see Figure 3). The top plate portion 52 is fixed by screws from the part that covers the support member 40 toward the support member 40 and the existing wall flashing plate 16. At this time, the tip of the screw penetrates the horizontal plate portion 16b of the existing wall flashing 16, but because waterproof double-sided tape 31 is laid on the surface of the horizontal plate portion 16b, the gap between the screw hole formed in the horizontal plate portion 16b and the screw is sealed by the waterproof double-sided tape 31, thereby ensuring waterproofing.

[0031] The end plate portion 53 is the part that covers the end faces of the ventilation member 30 and the support member 40 on the newly installed roofing material 20 side. The end plate portion 53 is formed continuously with the tip of the upper plate portion 52 and is bent downward at a right angle. The end plate portion 53 is in contact with or close to the end faces of the ventilation member 30 and the support member 40. Ventilation holes 55 are formed in the end plate portion 53. The ventilation holes 55 are holes for allowing air from the side wall ventilation layer 17 of the side wall 14 to vent to the outside, and are arranged to be connected to and opposite the ventilation member 30. The ventilation holes 55 also have the function of draining water that has entered into the side wall 14. The ventilation holes 55 have a horizontally elongated slit shape and are formed in multiples at predetermined intervals along the longitudinal direction of the newly installed wall flashing plate 50. The ventilation holes 55 are formed at the lower end of the end plate portion 53 and are arranged at regular intervals (equal to the height of the ventilation holes 55) above the lower end of the end plate portion 53. A skirt portion 56 covering the sealing material 22 is formed at the lower end of the end plate portion 53. The skirt portion 56 is formed continuously with the lower end of the end plate portion 53, bends at an obtuse angle relative to the end plate portion 53, and its tip is inclined diagonally downward. The tip of the skirt portion 56 is in contact with or close to the surface of the newly installed roofing material 20. The skirt portion 56 and the sealing material 22 inside it prevent rainwater from flowing back towards the ventilation member 30 and support member 40. In addition, by forming the ventilation holes 55 at a height at regular intervals from the lower end of the end plate portion 53, the intrusion of rainwater blown in from the downstream side is prevented, and a decrease in rigidity is suppressed.

[0032] The connecting flashing plate 60 is a flashing that covers the upper end of the newly installed wall flashing plate 50 and is attached to the surface plate material 14b of the side wall 14 above the newly installed wall flashing plate 50. The connecting flashing plate 60 is a member that prevents water from flowing over the upper end of the newly installed wall flashing plate 50. The connecting flashing plate 60 comprises a contact plate portion 61, an overhanging plate portion 62, and a hanging plate portion 63. The contact plate portion 61 is the part that fixes the connecting flashing plate 60 to the side wall 14, rising above the newly installed wall flashing plate 50 along the surface plate material 14b of the side wall 14, and fixing it in contact with the surface plate material 14b. The overhanging plate portion 62 is the part that covers the upper end of the rising plate portion 51 of the newly installed wall flashing plate 50 from above. The overhanging plate portion 62 is formed continuously with the lower end of the contact plate portion 61 and bends outward in a direction away from the side wall 14. The hanging plate portion 63 is the part that covers the upper end of the rising plate portion 51 of the newly installed wall flashing plate 50 from the side. The hanging plate portion 63 is formed continuously with the tip of the overhanging plate portion 62 and bends downward at a right angle. The lower end of the hanging plate portion 63 is positioned lower than the upper end of the rising plate portion 51.

[0033] Next, the construction method of the roof repair structure 1 according to this embodiment will be described with reference to Figures 6 to 9. The construction method of the roof repair structure 1 comprises a new roof installation step, a double-sided tape laying step, a ventilation member installation step, a new wall flashing installation step, and a joint flashing installation step.

[0034] The new roof installation process involves installing new roofing material 20 on top of existing roofing material 10. As shown in Figure 6(a), the existing roofing material 10 is laid on top of the roof decking 11 via underlayment 12. A coping 15 is laid at the junction of the existing roofing material 10 and the side wall 14, and an existing wall flashing 16 is installed on top of the coping 15. To install the new roofing material 20, first, as shown in Figure 6(b), a repair adhesive underlayment 21 is laid on top of the existing roofing material 10. The leading edge of the repair adhesive underlayment 21 rises along the vertical plate portion 16c of the existing wall flashing 16 and extends to the upper surface of the horizontal plate portion 16b. Then, as shown in Figure 7(a), the new roofing material 20 is laid on top of the repair adhesive underlayment 21, and sealant 22 is applied to the ends of the new roofing material 20. The sealant 22 is applied to cover the gap between the edge of the new roofing material 20 and the vertical plate portion 16c of the existing wall flashing 16.

[0035] The double-sided tape installation process, as shown in Figure 7(b), involves laying waterproof double-sided tape 31 on top of the existing wall flashing 16 at the junction of the upper edge and side edge (upper edge shown in Figure 7) of the new roofing material 20 with the side wall 14. The waterproof double-sided tape 31 is used to adhere the ventilation member 30 and the support member 40 to the existing wall flashing 16, and is attached to the upper surface of the horizontal plate portion 16b of the existing wall flashing 16. The tip of the waterproof double-sided tape 31 on the new roofing material 20 side is attached to the surface of the repair adhesive underlayment 21 laid on the horizontal plate portion 16b, and extends to the tip of the horizontal plate portion 16b.

[0036] The ventilation member installation process, as shown in Figure 8, involves installing the ventilation member 30 and the support member 40 on the waterproof double-sided tape 31. In the ventilation member installation process, the ventilation member 30 (see Figure 8(b)) and the support member 40 (see Figure 8(a)), which are alternately connected and integrated to a predetermined length, are installed on the waterproof double-sided tape 31 from the tip of the horizontal plate portion 16b that is outside the side wall 14. Since the ventilation member 30 and the support member 40 have equivalent cross-sectional shapes, they are installed in the same position in the cross-sectional view of Figure 8. At the joint between the upper edge and the side edge of the newly installed roofing material 20, the support member 40 is placed at the corner, and the ventilation member 30 is positioned to extend in an L-shape from the support member 40 (see Figure 4).

[0037] The process of installing the new wall flashing is as shown in Figure 9, and involves installing the new wall flashing 50 so as to cover the ventilation member 30 and the support member 40, and fixing the new wall flashing to the support member 40 and the side wall 14. In the new wall flashing installation process, the rising plate portion 51 of the new wall flashing 50 is brought into contact with the surface plate material 14b of the side wall 14 and bonded, and the top plate portion 52 is placed on the support member 40 and fastened with screws. A sealant is provided at the inside corner formed by the side wall 14 and the lip portion 54. The tip of the screw penetrates the support member 40 and the horizontal plate portion 16b of the existing wall flashing 16. The gap between the screw hole formed in the horizontal plate portion 16b and the screw is sealed with waterproof double-sided tape 31. The end plate portion 53 of the new wall flashing 50 covers the end faces of the ventilation member 30 and the support member 40 on the new roofing material 20 side. Since ventilation holes 55 are formed in the end plate portion 53, the side wall ventilation layer 17 of the side wall 14 is connected to the outside air via the ventilation member 30 and the ventilation holes 55, thus ensuring ventilation between the inside of the side wall 14 and the outside.

[0038] The joint flashing installation process involves installing the joint flashing 60 above the newly installed wall flashing 50. In the joint flashing installation process, as shown in Figure 2, the contact plate portion 61 of the joint flashing 60 is bonded to the surface plate material 14b of the side wall 14 above the newly installed wall flashing 50. A sealant is laid on the bonding surface of the upper end of the contact plate portion 61. As a result, the overhanging plate portion 62 and the hanging plate portion 63 of the joint flashing 60 cover the upper end of the newly installed wall flashing 50, preventing water from flowing over the upper end of the newly installed wall flashing 50. Once the joint flashing 60 is installed, the construction of the roof repair structure 1 is completed.

[0039] According to the roof repair structure 1 and its construction method of this embodiment, since a ventilation member 30 is provided at the lower part of the newly installed wall flashing plate 50, ventilation performance between the inside and outside of the side wall 14 can be ensured (a certain amount of air inside the side wall 14 can be drained, and air can be drawn in and out between the inside and outside of the side wall 14). Furthermore, since ventilation holes 55 are formed in the end plate portion 53 of the newly installed wall flashing plate 50, the ventilation member 30 can be connected to the outside air, so that air inside the side wall 14 can be efficiently discharged to the outside through the ventilation member 30 and ventilation holes 55, and outside air can be drawn in. Therefore, ventilation performance can be further enhanced. Moreover, since the ventilation member 30 and the support member 40 are arranged alternately, the newly installed wall flashing plate 50 can be screwed in in a stable state. In addition, according to the roof repair structure 1 of this embodiment, water that has penetrated into the inside of the side wall 14 through the ventilation member 30 can be drained to the outside through the ventilation holes 55. In other words, according to the roof repair structure 1 of this embodiment, drainage performance can be ensured in addition to ventilation performance.

[0040] Furthermore, since the existing roofing material 10 is left in place and the new roofing material 20 and new wall flashing plate 50 are installed on top of it, the waterproofing structure becomes double-layered, and the waterproofing performance can be enhanced. In addition, since waterproof double-sided tape 31 is laid on the surface of the existing wall flashing plate 16, the ventilation member 30 and the support member 40 can be easily bonded to the surface of the existing wall flashing plate 16, and when the new wall flashing plate 50 is screwed to the support member 40 and the existing wall flashing plate 16, the waterproof double-sided tape 31 gets into the screw holes of the existing wall flashing plate 16, so watertightness can be ensured.

[0041] Next, the configuration of the roof repair structure 101 according to the second embodiment will be described with reference to Figures 10 and 11. In the roof repair structure 1 according to the first embodiment, ventilation holes 55 are formed in the end plate portion 53 of the newly installed wall flashing plate 50, whereas in the roof repair structure 101 according to the second embodiment, ventilation holes are not formed in the end plate portion 153 of the newly installed wall flashing plate 150.

[0042] As shown in Figures 10 and 11, the new wall flashing 150 of the second embodiment has a wide upper plate portion 152, and its tip portion 152a extends a predetermined length toward the new roofing material 20 beyond the end faces of the ventilation member 30 and the support member 40 (the ventilation member 30 is shown in Figures 10 and 11). As a result, a clearance of a predetermined interval is formed between the end face of the existing wall flashing 16 toward the existing roofing material 10 and the end plate portion 153, and this clearance becomes a ventilation space 155 connected to the ventilation member 30. The skirt portion 156 is arranged parallel to the new roofing material 20 at a predetermined interval from the new roofing material 20. The gap between the skirt portion 156 and the new roofing material 20 connects the ventilation space 155 to the outside air. Note that the configuration of the other ventilation members 30 and support members 40 is the same as in the first embodiment, so the same reference numerals are used and their description is omitted.

[0043] According to the roof repair structure 101 with the above configuration, the newly installed wall flashing 150 Even without ventilation holes, the air inside the side wall 14 can be efficiently discharged to the outside through the ventilation member 30 and the ventilation space 155, and outside air can be drawn in. Furthermore, water that has penetrated into the inside of the side wall 14 can be drained to the outside through the ventilation space 155. In other words, the roof repair structure 101 ensures ventilation performance and drainage performance. Furthermore, since the new wall flashing plate 150 does not have ventilation holes, the new wall flashing plate 150 This makes it difficult for rainwater and other liquids to penetrate the inside, thus improving waterproofing performance.

[0044] Although embodiments for carrying out the present invention have been described above, the present invention is not limited to the above embodiments, and the design can be modified as appropriate without departing from the spirit of the present invention. For example, in the first embodiment, the ventilation holes 55 of the newly installed wall flashing plate 50 are horizontally elongated slits, but the shape of the ventilation holes is not limited to this. For example, they may be vertically elongated slits, or other shapes as shown in Figure 12. The ventilation holes 55a of the newly installed wall flashing plate 50a shown in Figures 12(a) and (b) are formed by pressing in a part of the end plate portion 53 and include a deformed plate portion 57 that extends below the upper plate portion 52. The deformed plate portion 57 has a U-shaped cross-section. The upper and lower edges of the deformed plate portion 57 are cut from the end plate portion 53, and the gap in the cut portion serves as a ventilation passage. With ventilation holes 55a of this configuration, ventilation performance can be ensured, and the deformed plate portion 57 blocks rainwater that blows in, making it difficult for rainwater to penetrate into the interior of the new wall flashing plate 50. On the other hand, the ventilation holes 55b of the new wall flashing plate 50b shown in Figure 12(c) are circular in shape and are formed in multiples at predetermined intervals along the longitudinal direction of the new wall flashing plate 50b.

[0045] Furthermore, although the ventilation member 30 and the support member 40 were configured separately in the above embodiment, the invention is not limited to this. For example, the ventilation member may be configured to support the load of the newly installed wall flashing 50. As shown in Figure 13, the modified ventilation member 35 has sufficient strength to support the newly installed wall flashing 50 while maintaining ventilation performance. The ventilation member 35 is made of resin and comprises a support portion 36, a ventilation space 37, and a plate-shaped portion 38. The support portion 36 is the part that supports the load of the newly installed wall flashing 50 and is erected in a columnar shape. The support portion 36 spans the upper and lower plate-shaped portions 38, 38 and is formed in multiples with spacing between them in the lateral direction. The ventilation space 37 is a space for allowing air inside the side wall 14 to flow to the outside and is formed by the gap between adjacent support portions 36. The lower plate-shaped portion 38 is installed on top of waterproof double-sided tape 31 attached to the upper surface of the horizontal plate portion 16b of the existing wall flashing 16. The upper plate-like portion 38 is on which the newly installed wall flashing plate 50 is placed. With this configuration, the newly installed wall flashing plate 50 can be easily fixed while ensuring ventilation and drainage performance.

[0046] Furthermore, in the above embodiment, the ventilation member 30 and the support member 40 Existing wall flashing Although it is placed on 16, it is not limited to this. For example, as shown in Figure 14(b), Existing wall flashing A ventilation member and a support member 40a may be installed on the existing roofing material 10 (the side edge or upper edge of the existing roofing material 10 at the interface with the side wall 14) in the area where the horizontal plate portion 16b and vertical plate portion 16c of 16 and the coping 15 below the horizontal plate portion 16b have been removed (Figure 14 shows the "support member 40a"). Existing wall flashing The tip of the horizontal plate portion 16b of 16 is removed, while the base portion remains. In this case, the height dimension of the ventilation member and support member 40a is greater than that of the above embodiment by the thickness of the new roofing material 20. The new wall flashing plate 50 is positioned lower than in the above embodiment. Even with this configuration, the same effects and advantages as in the above embodiment can be obtained.

[0047] The following describes a method for constructing a roof repair structure with the above configuration, based on a modified example. This construction method comprises a cutting step, a removal step, a new roof installation step, a double-sided tape laying step, a ventilation member installation step, and a new wall flashing installation step. In this construction method, the cutting step and the removal step are added to the construction method of the first embodiment.

[0048] As shown in Figure 14(a), the cutting process is a process of cutting off the tip of the existing wall flashing 16 at the junction between at least one of the upper edge and side edge of the existing roofing material 10 and the side wall 14. In the cutting process, Existing wall flashing The tip of the horizontal plate portion 16b, the vertical plate portion 16c, and the inclined portion beyond it are cut off. The horizontal plate portion 16b is cut at a position that does not interfere with the ventilation member and support member 40a which will be installed in a later step. The removal process involves removing the underlayment (coping 15) on the lower side of the existing wall flashing 16. In the removal process, the nails (not shown) that secure the coping 15 are removed. Existing wall flashing Pull the cap rail 15 out from the underside of the base end of the horizontal board section 16b of 16.

[0049] The following steps are generally the same as the construction method of the first embodiment, so a detailed explanation will be omitted. In the new roof installation step, the new roofing material 20 is installed on top of the existing roofing material 10, excluding the upper edge and side edges. In the double-sided tape laying step, at the joint between the upper edge and side wall of the new roofing material 20, the upper edge of the existing roofing material 10 is laid on top of Waterproof double-sided tape Lay down 31. Waterproof double-sided tape 31 is laid up to a position close to the upper edge of the newly installed roofing material 20. In the ventilation member installation process, Waterproof double-sided tape On top of 31, a ventilation member that allows air to pass through and a support member 40a that supports the newly installed wall flashing are installed. In Figure 14(b), the support member 40a is shown. The ventilation member has the same cross-section as the support member 40a and is positioned on the extension of the support member 40a. In the process of installing the newly installed wall flashing, the newly installed wall flashing 50 is installed so as to cover the ventilation member and the support member 40a, and the newly installed wall flashing 50 is fixed to the support member 40a with screws. The roof repair structure 1 is constructed by these steps.

[0050] According to the modified construction method, similar to the construction method of the first embodiment, ventilation performance inside the side wall 14 can be ensured through the ventilation member. Furthermore, since the new roofing material 20 is installed on top of the existing roofing material 10, waterproof performance can also be ensured. In addition, the ventilation member can be adhered to the surface of the existing roofing material 10 with waterproof double-sided tape 31.

[0051] Furthermore, in the above embodiment, the ventilation member 30 and the support member 40 are provided close to the lower end of the surface plate material 14b of the side wall 14, but the invention is not limited to this. As shown in Figure 15, the ventilation member 30a and the support member may be arranged at a predetermined distance from the lower end of the surface plate material 14b. The ventilation member 30a and the support member (not shown) in Figure 15 are formed to be shorter in length in the water gradient direction than the ventilation member and support member of the first embodiment, and the upstream ends of the ventilation member 30a and the support member are spaced apart from the lower end of the surface plate material 14b. As a result, a gap that forms a ventilation passage 18 is formed between the ventilation member 30a and the support member and the surface plate material 14b. 30a and extends laterally along the longitudinal direction of the support member. With this configuration, air flowing from the side wall ventilation layer 17 to the upstream side of the support member flows laterally along the ventilation passage 18 and into the ventilation member 30a This is guided to improve ventilation performance. Furthermore, the gap between the ventilation member 30a and the support member and the lower end of the surface plate material 14b can be set as a clearance to absorb dimensional errors of the surface plate material 14b when the alignment accuracy of the lower end of the surface plate material 14b is poor. Thus, workability is improved.

[0052] Alternatively, as shown in Figure 16, the upper end of the ventilation member 30b may be pushed inward from the lower end of the surface plate material 14b of the side wall 14. The upper end of the ventilation member 30b extends below the base vertical member 14c and faces the side wall ventilation layer 17. With this configuration, even if the alignment accuracy of the lower end of the surface plate material 14b is poor, the side wall ventilation layer 17 and the ventilation member 30b can be connected, thus ensuring ventilation performance. In addition, since the upper end of the ventilation member 30b is locked to the lower end of the surface plate material 14b, the fixation of the ventilation member 30b is improved. [Explanation of symbols]

[0053] 1. Roof renovation structure 10 Existing roofing materials 14 Side wall 17 Side wall ventilation layer 20 New roofing materials 30 Ventilation component 31 Waterproof double-sided tape 40 Support member 50 New wall flashing 51. Upright plate section 52 Top plate part 53 End plate part 55 Ventilation holes 60 Joint flashing plate

Claims

1. New roofing materials are installed on top of existing roofing materials, A ventilation member is installed on top of the existing wall flashing at the interface between the upper edge and side edge of the newly installed roofing material and the side wall, It includes a newly installed wall flashing plate that is installed so as to cover the aforementioned ventilation member, The ventilation member is arranged in communication with a side wall ventilation layer that opens at the lower end of the side wall. A roof repair structure characterized by the following features.

2. The system further comprises a support member that is installed on the existing wall flashing and supports the newly installed wall flashing, The ventilation member and the support member are arranged along at least one of the upper edge and side edge of the newly installed roofing material. The roof repair structure according to feature 1.

3. The ventilation member and the support member have the same rectangular cross-sectional shape. The newly installed wall flashing plate has a rising plate portion that rises along the side wall against which the existing roofing material abuts, a top plate portion that covers the upper surfaces of the ventilation member and the support member, and an end plate portion that covers the end faces of the ventilation member and the support member on the newly installed roofing material side. The end plate portion has ventilation holes that connect to the ventilation member. The roof repair structure according to feature 2.

4. The aforementioned ventilation holes have a horizontally elongated slit shape and are positioned at intervals above the lower end of the end plate portion. The roof repair structure according to feature 3.

5. The ventilation member and the support member have the same rectangular cross-sectional shape. The newly installed wall flashing plate has a rising plate portion that rises along the side wall against which the existing roofing material abuts, a top plate portion that covers the upper surfaces of the ventilation member and the support member, and an end plate portion that covers the end faces of the ventilation member and the support member on the newly installed roofing material side. A predetermined clearance is formed between the end face of the existing wall flashing on the existing roofing material side and the end face plate portion, and this clearance becomes a ventilation space connected to the ventilation member. The roof repair structure according to feature 2.

6. The ventilation member comprises a plurality of support parts that support the load of the newly installed wall flashing plate, and a ventilation space formed between the support parts. The roof repair structure according to feature 1.

7. Waterproof double-sided tape is laid on the surface of the existing wall flashing. A roof repair structure according to any one of claims 1 to 6.

8. New roofing materials are installed on top of existing roofing materials, A ventilation member is installed on top of the existing roofing material at the interface between the upper edge and the side edge of the newly installed roofing material and the side wall, It includes a newly installed wall flashing plate that is installed so as to cover the aforementioned ventilation member, The ventilation member is arranged in communication with a side wall ventilation layer that opens at the lower end of the side wall. A roof repair structure characterized by the following features.

9. The process of installing a new roof involves installing new roofing materials on top of existing roofing materials, The process of laying waterproof double-sided tape on the existing wall flashing at the junction between at least one of the upper edge and side edge of the newly installed roofing material and the side wall, A ventilation member installation step involves installing a ventilation member that allows air to pass through and a support member that supports the newly installed wall flashing on top of the waterproof double-sided tape, The process includes installing the new wall flashing so as to cover the ventilation member and the support member, and fixing the new wall flashing to the support member and the existing wall flashing with screws. A method for constructing a roof repair structure characterized by the following features.

10. A cutting process in which the tip of the existing wall flashing is cut off at the junction between at least one of the upper edge and side edge of the existing roofing material and the side wall, The removal process involves removing the underlayment beneath the existing wall flashing, A new roof installation process involves installing new roofing material on top of the existing roofing material, excluding the edges, A double-sided tape laying step is performed in which waterproof double-sided tape is laid on the edge portion of the existing roofing material at the interface between the upper edge portion and the side edge portion of the newly installed roofing material and the side wall portion, A ventilation member installation step involves installing a ventilation member that allows air to pass through and a support member that supports the newly installed wall flashing on top of the waterproof double-sided tape, The process includes installing the new wall flashing plate so as to cover the ventilation member and the support member, and fixing the new wall flashing plate to the support member with screws. A method for constructing a roof repair structure characterized by the following features.

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