Roof repair structure and construction method therefor

Abstract

To provide a roof repair structure that can ensure ventilation and drainage performance inside the sidewalls and its construction method.SOLUTION: A roof repair structure comprises: a new roofing material 30 installed over an existing roofing material 10; and a new water cut member 20 with a cut-off material installed over the existing roofing material 10 at a connection part of at least one of the top and side edges of the new roofing material 30 adjacent to a sidewall 14 and the sidewall 14. The water cut member 20 with the cut-off material comprises a water cut plate 21, and a cut-off material 22 fixed to the sidewall 14 side of the water cut plate 21. A base end of the water cut plate 21 passes through a gap between a bottom edge of a surface plate material 14b of the sidewall 14 and the existing roofing material 10, and enters a substrate part side 14a of the sidewall 14, and the cut-off material 22 is pressed against the substrate part 14a of the sidewall 14.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roof renovation structure formed by renovating an existing roof, and a method for constructing the same. [Background technology]

[0002] A known method of repairing an existing roof using a decorative slate roof is the "covering method," in which the existing decorative slate roof is left in place and a new roof is laid on top of it (see, for example, Non-Patent Document 1 and Patent Document 1). With the covering method, underlayment is laid on top of the existing roofing material, and then new roofing material is installed. At the joints between the exterior wall (side wall) above the water and on the sides of the sloped roof, a new underlayment board is laid on top of the existing wall water-repellent board, and a new wall water-repellent board is installed to cover this underlayment board. [Prior art documents] [Patent documents]

[0003] [Non-Patent Document 1] "Steel Roof Construction Standard SSR2007" Japan Metal Roof Association, Japan Steel Construction Association, January 2008, p308-316

[0004] [Patent Document 1] JP 2017-172156 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the repair method of Non-Patent Document 1, waterproof performance is ensured, but ventilation performance of the side walls is not ensured. It is undesirable that the ventilation performance of the side walls that was ensured in the new roof structure is lost after the repair.

[0006] Therefore, an objective of the present invention is to provide a roof renovation structure and a method for constructing the same that can ensure ventilation and drainage performance inside the side walls. [Means for solving the problem]

[0007] The first invention for solving the above-mentioned problems comprises a newly installed roofing material installed on top of an existing roofing material, and a newly installed water-stopping drip-line member installed on top of the existing roofing material at the joint between the side wall and at least one of the upper edge and side edge of the newly installed roofing material adjacent to the side wall, wherein the water-stopping drip-line member has a water-stopping plate and a water-stopping material fixed to the side wall side of the water-stopping plate, the base end of the water-stopping plate passes through the gap between the lower end of the surface panel material of the side wall and the existing roofing material and penetrates into the base side of the side wall, and the water-stopping material is pressed against the base of the side wall.

[0008] According to the roof renovation structure of the present invention, a gap exists between the flashing member with water-stopping material and the surface panel material of the side wall, so that the ventilation performance inside the side wall can be ensured. 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 sucked in and discharged (intake and exhaust) between the inside of the side wall and the outside. Even if water infiltrates inside the side wall, it can be drained to the outside via the flashing member with water-stopping material. Furthermore, the water-stopping material can prevent water from infiltrating below the flashing member with water-stopping material.

[0009] In the roof repair structure of the present invention, it is preferable that the water drainage plate of the water stopper-equipped water drainage member has a step portion formed to block water from the newly installed roof material side. With this configuration, even if a strong wind blows from the newly installed roof material to the side wall side, the step portion blocks water, thereby improving waterproofing performance.

[0010] In addition, the roof repair structure of the present invention further includes a ventilation member installed on the water-stopping material-attached water-stopping member and a new wall water-stopping plate installed so as to cover the ventilation member, and the ventilation member is preferably arranged in communication with the side wall ventilation layer that opens at the lower end of the surface plate. According to this configuration, the provision of the new wall water-stopping plate further improves the waterproof performance. Furthermore, the ventilation member can ensure the ventilation performance inside the side wall (both the performance of being able to exhaust a certain amount of air inside the side wall to the outside, and the performance of being able to intake and exhaust (intake and exhaust) air between the inside of the side wall and the outside). In addition, the drainage performance of draining water that has infiltrated into the side wall through the ventilation member can also be ensured.

[0011] Furthermore, in the roof repair structure of the present invention, it is preferable that the upper edge and side edge of the existing roof material are provided with an existing wall water-repelling board, and a support bar is further provided on the tip of the existing wall water-repelling board, the water-stopping material-attached water-repelling member is supported by the support bar, and the tip of the water-stopping material-attached water-repelling member is laid on the edge of the new roof material. With this configuration, the water-stopping material-attached water-repelling member can be supported in a stable state by providing the support bar. Also, by laying the tip of the water-stopping material-attached water-repelling member on the edge of the new roof material, waterproof performance can be ensured while omitting the new wall water-repelling board.

[0012] The second invention for solving the above problem includes a step of installing a flashing member with water-stopping material, which includes a flashing board and a water-stopping material, on an existing roof material adjacent to a side wall; a new roof installation step of installing a new roof material on the leading end of the existing roof material and the flashing member with water-stopping material; and installing a ventilation member through which air can pass and a support member for supporting the new wall flashing board on the flashing member with water-stopping material at the interface between at least one of the upper edge and the side edge of the new roof material and the side wall. and a new wall water-repellent board installation process in which the newly constructed wall water-repellent board is installed to cover the ventilation member and the support member and the newly constructed wall water-repellent board is fixed to the support member. In the water-stopping material-attached water-repellent board installation process, a base end of the water-repellent board is inserted into the base portion of the side wall through a gap between the lower end of the surface panel material of the side wall and the existing roof material, and the water-stopping material fixed to the base end of the water-repellent board is pressed against the base portion.

[0013] According to the method for constructing a roof renovation structure of the present invention, even if the gap between the surface panel material of the side wall and the existing roof material is small, the water stop material can be easily pressed against the base part of the side wall by inserting the water stop material-attached water cutoff member. In other words, a roof renovation structure with ventilation and drainage performance can be easily constructed with simple construction. In addition, the provision of a new wall water cutoff plate further improves waterproof performance. Furthermore, ventilation performance inside the side wall can be ensured through the ventilation member.

[0014] The third invention for solving the above-mentioned problems is a method for constructing a roof repair structure of the present invention, which comprises a new roof installation process for installing a new roof material on top of the existing roof material adjacent to the side wall, a support bar installation process for installing a support bar on the tip of an existing wall water flashing board provided on the upper edge and side edge of the existing roof material, and a water-stopping material-attached water-stopping member installation process for installing a water-stopping material-attached water-stopping member comprising a water-stopping board and a water-stopping material so as to cover the support bar and the edge of the newly installed roof material, wherein the water-stopping material-attached water-stopping member installation process is a method for constructing a roof repair structure, which is characterized in that the base end of the water-stopping board is inserted into the base part of the side wall through the gap between the lower end of the surface panel material of the side wall and the existing roof material, and the water-stopping material fixed to the base end of the water-stopping board is pressed against the base part.

[0015] According to the method for constructing a roof renovation structure of the present invention, even if the gap between the surface panel material of the side wall and the existing roof material is small, the water stop material can be easily inserted and pressed against the base part of the side wall. In other words, a roof renovation structure with ventilation and drainage performance can be easily constructed with simple construction. In addition, the provision of a support rail allows the water stop material to be supported in a stable state. Effect of the Invention

[0016] According to the roof renovation structure and the construction method thereof of the present invention, it is possible to ensure the ventilation performance and drainage performance inside the side wall. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a partially cutaway perspective view showing a roof renovation structure relating to the first embodiment of the present invention. [Diagram 2] FIG. 1 is a cross-sectional view of a roof repair structure according to a first embodiment of the present invention, viewed from the flow direction. [Diagram 3] This is a cross-sectional view of the roof structure before renovation, viewed from the flow direction. [Figure 4] FIG. 2 is a partially cutaway perspective view showing a roof renovation structure relating to a second embodiment of the present invention. [Diagram 5] A cross-sectional view of a roof repair structure relating to a second embodiment of the present invention as viewed from the flow direction. [Figure 6] A cross-sectional view of a roof renovation structure for the third embodiment of the present invention viewed from the girder direction. [Figure 7] A cross-sectional view of a roof repair structure relating to the third embodiment of the present invention as viewed from the flow direction. [Figure 8] This is a cross-sectional view of the roof structure before renovation, viewed from the girder direction. [Figure 9] This is a cross-sectional view of the roof structure before renovation, viewed from the flow direction. [Figure 10] FIG. 11 is a diagram showing modified shapes of a drainage member with a water-stopping material, where (a) is a cross-sectional view showing a first modified water-stopping material, and (b) is a cross-sectional view showing a second modified water-stopping material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] A roof renovation structure and a method for constructing the same according to a first embodiment of the present invention will be described in detail with reference to the drawings. First, the configuration of the roof renovation structure will be described. The roof renovation structure according to this embodiment is a renovation structure in which a new roof material is installed while leaving the existing roof material. As shown in Figures 1 and 2, the roof renovation structure 1 includes a water-stopping material-attached water-repellent member 20 installed on the existing roof material 10, a new roof material 30, a ventilation member 40, a support member 41, a new wall water-repellent board 50, and a joint water-repellent board 60.

[0019] The existing roofing material 10 is a board material constructed before the renovation, and a side wall 14 is erected on the side of the existing roofing material 10. The existing roofing material 10 is laid in multiple sheets on a sheathing board 11 installed on rafters (not shown) via underlayment material 12. The existing roofing material 10 is fixed to the sheathing board 11 with nails. The underlayment material 12 extends to the surface of the base part 14a of the side wall 14 and rises to a predetermined height along the base part 14a. Specifically, the rise dimension of the underlayment material 12 is about 250 mm, and rises about 50 mm higher than the upper end of the rising part 15a of the existing L-shaped water drain 15 described later. At the side edge part of the existing roofing material 10 in the water gradient direction, the existing L-shaped water drain 15 is installed at the joint part with the side wall 14. The existing L-shaped drain 15 has an L-shaped cross section and includes a rising portion 15a. The rising portion 15a abuts against the underlayment 12 that rises along the surface of the base portion 14a. An exterior wall underlayment 16 is laid above the rising portion 15a. The exterior wall underlayment 16 is laid from the surface of the base portion 14a to the upper edge of the rising portion 15a, covering the upper end of the rising portion 15a.

[0020] The surface plate material 14b of the side wall 14 is fixed to the base vertical members 14c. The base vertical members 14c are disposed on the back surface side of the surface plate material 14b with a predetermined interval therebetween. Between adjacent base vertical members 14c is a side wall ventilation layer 17 (see FIG. 1) that spreads in the vertical direction inside the side wall 14. The side wall ventilation layer 17 opens downward at the lower end of the side wall 14.

[0021] The flashing member with water-stop material 20 is a new flashing member to be installed on the existing roof material 10, and includes a flashing board 21 and a water-stop material 22. The flashing board 21 has an L-shaped cross section and includes a rising portion 21a and a flat portion 21b. The rising portion 21a is bent continuously to the end of the flat portion 21b on the base portion 14a side of the side wall 14, and rises upward along the base portion 14a of the side wall 14. The tip of the flat portion 21b protrudes closer to the center of the roof than the tip of the existing L-shaped flashing 15.

[0022] The water-stopping material 22 is, for example, a packing made of an elastic material, and is attached to the surface of the rising portion 21a facing the base portion 14a. The water-stopping material 22 is pressed against the base portion 14a and is in a compressed state.

[0023] The new roofing material 30 is a board material that is newly installed on the water-stopping material-attached water-repellent member 20 and the existing roofing material 10 that was left behind without being removed. A plurality of new roofing materials 30 are laid on the existing roofing material 10 via a modified adhesive underlayment 31. The modified adhesive underlayment 31 is configured with an adhesive layer and release paper on the back side of the underlayment, and is attached to the existing roofing material 10 by peeling off the release paper during construction. The modified adhesive underlayment 31 is laid up to the side edge of the surface of the existing roofing material 10. The new roofing material 30 is laid on the modified adhesive underlayment 31 and fixed using nails. The nails extend downward from the top of the new roofing material 30 through the modified adhesive underlayment 31. Note that an underlayment without an adhesive layer may be laid instead of the modified adhesive underlayment 31. The side edge of the new roofing material 30 is laid extending up to above the tip of the flat portion 21b of the waterproofing member 20. A sealing material 32 is provided on the side edge end face of the new roofing material 30. The sealing material 32 is an amorphous sealing material that covers the space between the side edge of the new roofing material 30 and the lower ends of the ventilation member 40 and the support member 41 (portions corresponding to the height of the new roofing material 30), and is provided along the longitudinal direction of the ventilation member 40 and the support member 41.

[0024] The ventilation member 40 is a member that ventilates the air inside the side wall 14 to the outside. The ventilation member 40 is composed of a plate-shaped member with a three-dimensional mesh structure made of resin, and the hollow portion is continuously ventilated in all directions. The ventilation member 40 is, for example, flexible, and is unfolded from a rolled-up state and laid down. The ventilation member 40 is installed on the existing L-shaped drainage 15 and the drainage member 20 with water-stopping material at the interface between the upper edge (not shown) and side edge of the new roof material 30 in the water gradient direction and the side wall 14. The ventilation member 40 has a rectangular parallelepiped shape extending in the longitudinal direction of the existing L-shaped drainage 15 (see FIG. 1), and a plurality of ventilation members 40 are laid down at predetermined intervals along the longitudinal direction of the existing L-shaped drainage 15. The ventilation member 40 is laid on the upper surface of the flat portion 21b of the water-stopping material-equipped drainage member 20, which protrudes outward beyond the surface panel material 14b of the side wall 14, and is arranged in communication with the side wall ventilation layer 17 which opens at the lower end of the side wall 14.

[0025] As shown in FIG. 1, the support member 41 is a member that supports the new wall water-cutting board 50, and is made of, for example, a block-shaped wooden material. The support member 41 is not limited to wood, and may be made of other materials such as resin. In addition, as long as it has the strength to support the new wall water-cutting board 50, the ventilation member may play the role of supporting the new wall water-cutting board 50. The cross-sectional shape of the support member 41 is the same as the cross-sectional shape of the ventilation member 40, and is arranged between the ventilation members 40, 40 arranged at intervals. In other words, the ventilation member 40 and the support member 41 are alternately arranged on the water-stopping material-attached water-cutting member 20 provided along the side edge of the new roof material 30. The arrangement of the ventilation member 40 and the support member 41 is not limited to one by one alternately. A plurality of the same members may be arranged side by side, or a plurality of one member may be arranged and a single other member may be arranged between them. In this embodiment, the cross-sectional shape of the support member 41 is the same as that of the ventilation member 40, but is not limited thereto, and the cross-sectional shape of the support member 41 and the cross-sectional shape of the ventilation member 40 may be different shapes. For example, the cross-sectional shape of the ventilation member 40 may be smaller than the cross-sectional shape of the support member 41. The ventilation member 40 and the support member 41 are temporarily fixed to the water-stopping material-equipped water-repellent member 20 via a waterproof double-sided tape 33 laid on the flat portion 21b of the water-stopping material-equipped water-repellent member 20. The support member 41 is fixed by a nail (or a screw) driven downward from the upper surface. The nail penetrates the waterproof double-sided tape 33 and extends downward. The tip of the nail penetrates the flat surface 21b of the water-stopping material-attached flashing member 20, but by laying the waterproof double-sided tape 33 on the surface of the flat surface 21b, the gap between the nail hole formed in the flat surface 21b and the nail is blocked by the waterproof double-sided tape 33, ensuring waterproofing. The support member 41 extending along the water gradient at the side edge of the newly installed roof material 30 is preferably inclined so that the side surface on the upper side of the water gradient becomes downstream of the water gradient as it moves away from the side wall 14. This prevents water that has flowed into the ventilation member 40 from flowing toward the side wall 14. The side surface of the support member 41 on the upper side of the water gradient may not be inclined.

[0026] The new wall drainage board 50 is a drainage material that covers the ventilation members 40 and the support members 41 above the existing L-shaped drainage board 15 and the drainage members with water-stopping material 20, and drains water that has flowed down the surface of the side wall 14 onto the new roof material 30. The new wall drainage board 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.

[0027] The rising plate portion 51 is a portion that fixes the new-wall drainage board 50 to the side wall 14, and rises along the surface panel material 14b of the side wall 14 and is fixed in contact with the lower end of the surface panel material 14b. A lip portion 54 that protrudes in a direction away from the side wall 14 is formed at the upper end of the rising plate portion 51. A seal member is laid on the upper surface of the lip portion. The new-wall drainage board 50 may have a shape that does not have the lip portion 54 at the upper end of the rising plate portion 51.

[0028] The upper panel portion 52 is a portion that covers the upper surfaces of the ventilation member 40 and the support member 41. The upper panel portion 52 is formed continuously with the lower end portion of the rising panel portion 51, and is bent relative to the rising panel portion 51 toward the newly-installed roof material 30. The upper panel portion 52 of the new wall water-repelling board 50 provided on the upper edge portion of the new roof material 30 is bent at an obtuse angle relative to the rising panel portion 51, with the tip side inclined diagonally downward (see FIG. 2). The upper panel portion 52 of the new wall water-repelling board 50 provided on the side edge portion of the new roof material 30 is bent at a right angle relative to the rising panel portion 51.

[0029] The end panel portion 53 is a portion that covers the end faces of the ventilation member 40 and the support member 41 on the side of the newly installed roof material 30. The end panel portion 53 is formed continuously with the tip of the upper panel portion 52 and is bent downward at a right angle. The end panel portion 53 abuts or is close to the end faces of the ventilation member 40 and the support member 41. The end panel portion 53 is fixed by a nail (or a screw) that is driven horizontally toward the support member 41. The end panel portion 53 is formed with a ventilation hole 55. The ventilation hole 55 is a hole for ventilating the air in the side wall ventilation layer 17 of the side wall 14 to the outside, and is arranged so as to be connected to the ventilation member 40 in opposition. The ventilation hole 55 also has the function of draining water that has infiltrated into the side wall 14. The ventilation holes 55 have a horizontally elongated slit shape, and a plurality of ventilation holes 55 are formed at predetermined intervals along the longitudinal direction of the newly installed wall water drainage board 50. The ventilation holes 55 are formed at the lower end of the end panel 53, and are arranged at regular intervals (equal to the height of the ventilation holes 55) from the lower end of the end panel 53 upward. The shape of the ventilation holes 55 is not limited to a horizontally elongated slit shape, and may be other shapes such as a vertically elongated slit shape, a circular shape, or a rectangular shape. A skirt portion 56 is formed at the lower end of the end panel 53. The skirt portion 56 is formed continuously with the lower end of the end panel 53, bent at an obtuse angle with respect to the end panel 53, and the tip side is inclined diagonally downward. The tip of the skirt portion 56 is folded back inward and abuts or is close to the surface of the newly installed roof material 30. The skirt portion 56 prevents rainwater and the like from flowing back toward the ventilation member 40 or the support member 41. In addition, by forming the ventilation holes 55 at a certain height from the lower end of the end plate portion 53, it is possible to prevent the infiltration of rainwater, etc. blown in from the downstream side and to suppress a decrease in rigidity.

[0030] The joint water-repelling board 60 is a water-repelling board that covers the upper end of the new-wall water-repelling board 50, and is attached to the surface panel material 14b of the side wall 14 above the new-wall water-repelling board 50. The joint water-repelling board 60 is a member that suppresses water from flowing to the upper end of the new-wall water-repelling board 50. The joint water-repelling board 60 has an abutment plate portion 61, an overhanging plate portion 62, and a hanging plate portion 63. The abutment plate portion 61 is a portion that fixes the joint water-repelling board 60 to the side wall 14, and rises along the surface panel material 14b of the side wall 14 above the new-wall water-repelling board 50 and is fixed in abutment against the surface panel material 14b. The overhanging plate portion 62 is a portion that covers the upper end of the rising plate portion 51 of the new-wall water-repelling board 50 from above. The overhanging plate portion 62 is formed continuously from the lower end of the abutting plate portion 61, and is bent and overhanging in a direction away from the side wall 14. The hanging plate portion 63 is a portion that covers the upper end of the rising plate portion 51 of the new wall drainage board 50 from the side. The hanging plate portion 63 is formed continuously from the tip of the overhanging plate portion 62, and is bent downward at a right angle. The lower end of the hanging plate portion 63 is located at a position lower than the upper end of the rising plate portion 51.

[0031] Next, a method for constructing the roof renovation structure 1 according to this embodiment will be described with reference to Figures 1 and 2. The method for constructing the roof renovation structure 1 includes a step of installing a water-stopping material-attached water-repellent member, a step of installing a new roof, a step of laying double-sided tape, a step of installing a ventilation member, a step of installing a new wall water-repellent board, and a step of installing a joint water-repellent board.

[0032] The step of installing a flashing member with water-stopping material is a step of installing a flashing member with water-stopping material 20 on top of an existing roof material 10 (see FIG. 3) adjacent to a side wall 14. In the step of installing a flashing member with water-stopping material, a water-stopping material 22 is fixed to the rising portion 21a of a flashing board 21 in advance to form a flashing member with water-stopping material 20. As shown in FIGS. 1 and 2, at the construction site, a repair adhesive underlayment 31 is laid on top of the existing roof material 10. The tip of the repair adhesive underlayment 31 is laid so as to extend to the side edge of the existing roof material 10. A worker grasps the flat portion 21b of the flashing member with water-stopping material 20 from the tip side of the flat portion 21b. Then, the base end of the water-repelling board 21 (the rising portion 21a, the base end of the flat portion 21b, and the water-stopping material 22) is inserted into the base portion 14a of the side wall 14 through the gap between the lower end of the surface panel material 14b of the side wall 14 and the existing roof material 10, and the water-stopping material 22 fixed to the base end of the water-repelling board 21 is pressed against the base portion 14a. Then, the flat portion 21b of the water-repelling board 21 is laid on the repair adhesive underlayment material 31 and fixed with nails or screws.

[0033] The new roof installation process is a process of installing a new roof material 30 on top of the existing roof material 10 and the leading end of the flashing member with water-stop material 20. In the new roof installation process, the new roof material 30 is laid on top of the repaired adhesive underlayment material 31 laid in the flashing member with water-stop material installation process.

[0034] The double-sided tape laying process is a process of laying a waterproof double-sided tape 33 on the water-stopping material-attached flashing member 20 at the joint between the side edge of the new roof material 30 and the side wall 14. The waterproof double-sided tape 33 is for adhering the ventilation member 40 and the support member 41 to the water-stopping material-attached flashing member 20, and is attached to the upper surface of the flat portion 21b of the flashing board 21. The waterproof double-sided tape 33 is laid at the installation position of the ventilation member 40 and the support member 41. The waterproof double-sided tape 33 may be attached to the lower surface of the support member 41 instead of the upper surface of the flat portion 21b. Also, a sealant may be laid instead of the waterproof double-sided tape 33.

[0035] The ventilation member installation process is a process of installing a ventilation member 40 and a support member 41 on top of the waterproof double-sided tape 33. In the ventilation member installation process, the ventilation members 40 and the support members 41 (see FIG. 1), which are alternately connected and integrated at a predetermined length, are installed on the waterproof double-sided tape 33. The support members 41 are fixed onto the waterproof flashing members 20 with nails or screws. At the joint between the upper edge and side edge of the newly installed roof material 30, the support members 41 are placed at the corners, and the ventilation members 40 are arranged so as to extend in an L shape from the support members 41.

[0036] Then, sealant 32 is applied between the side edge of the new roof material 30 and the lower ends (parts corresponding to the height of the new roof material 30) of the ventilation member 40 and the support member 41. The sealant 32 is applied so as to cover the gap between the edge of the new roof material 30 and the lower ends of the ventilation member 40 and the support member 41.

[0037] The new wall drainage board installation process is a process of installing the new wall drainage board 50 so as to cover the ventilation member 40 and the support member 41, and fixing the new wall drainage board 50 to the support member 41 and the side wall 14. In the new wall drainage board installation process, the rising plate portion 51 of the new wall drainage board 50 is abutted against the front plate material 14b of the side wall 14 and screwed, and the top plate portion 52 is placed on the support member 41, and the end plate portion 53 is fixed by a nail (or screw) driven horizontally toward the support member 41. A sealant is provided in the recessed corner formed by the side wall 14 and the lip portion 54. If there is no lip portion 54, a sealant is applied to the back surface of the rising plate portion 51 and fixed with a screw. The end panel portion 53 of the new wall water drainage board 50 is close to and covers the end faces of the ventilation member 40 and the support member 41 on the newly installed roof material 30 side. Since the end panel portion 53 has an air vent 55, the side wall ventilation layer 17 of the side wall 14 is connected to the outside air via the ventilation member 40 and the air vent 55, ensuring ventilation between the inside of the side wall 14 and the outside.

[0038] The joint water drainage installation process is a process of installing a joint water drainage 60 above the newly-constructed wall water drainage 50. In the joint water drainage installation process, the abutment plate portion 61 of the joint water drainage 60 is bonded to the surface plate material 14b of the side wall 14 above the newly-constructed wall water drainage 50. A sealant is laid on the bonding surface of the upper end portion of the abutment plate portion 61. This causes the protruding plate portion 62 and the hanging plate portion 63 of the joint water drainage 60 to cover the upper end portion of the newly-constructed wall water drainage 50, preventing water from flowing to the upper end portion of the newly-constructed wall water drainage 50. Once the joint water drainage 60 is installed, the construction of the roof renovation structure 1 is completed.

[0039] According to the roof renovation structure 1 and its construction method of the present embodiment, the provision of the water-stopping material-attached water-stopping member 20 improves the water-stopping performance. Since there is a gap between the water-stopping material-attached water-stopping member 20 and the lower end of the surface panel material 14b of the side wall 14, the side wall ventilation layer 17 inside the side wall 14 can be connected to the outside of the surface panel material 14b. In this embodiment, the side wall ventilation layer 17 can be connected to the outside through the ventilation member 40 and the ventilation hole 55. Therefore, the roof renovation structure 1 can ensure the ventilation performance inside the side wall even if the new wall water-stopping board 50 is provided. Furthermore, even if water infiltrates into the inside of the side wall, it can be drained to the outside through the water-stopping material-attached water-stopping member 20, the ventilation member 40, and the ventilation hole 55. Furthermore, the water-stopping material 22 can prevent water from infiltrating below the water-stopping material-attached water-stopping member 20. Furthermore, since the water-stopping material 22 is pressed against the base portion 14a, the water-stopping performance is improved.

[0040] In addition, the water-stopping material-attached water-repellent member 20 has an L-shaped cross section, and the water-stopping material 22 is fixed to the outer surface of the rising portion 21a, so that installation is easy. Specifically, the flat portion 21b of the water-repellent board 21 is grasped, and the base end of the water-repellent board 21 is inserted into the base portion 14a through the gap between the lower end of the surface plate material 14b of the side wall 14 and the existing roof material 10. This makes it possible to easily insert the base end of the water-repellent board 21 and press the water-stopping material 22 against the base portion 14a, even if the gap between the surface plate material 14b and the existing roof material 10 is not constant and the distance is small. In other words, the roof renovation structure 1 with ventilation and drainage performance can be easily constructed with simple construction.

[0041] Furthermore, in the roof repair structure 1 of this embodiment, the new wall drainage board 50 is provided on the drainage member 20 with water-stopping material, and the ventilation member 40 is provided at the lower part of the new wall drainage board 50, so that the ventilation performance between the inside and outside of the side wall 14 can be secured (a certain amount of air in the side wall 14 can be drained, and air can be taken in and out between the inside and outside of the side wall 14). In addition, since the ventilation hole 55 is formed in the end panel part 53 of the new wall drainage board 50, the ventilation member 40 can be connected to the outside air, so that the air in the side wall 14 can be efficiently discharged to the outside through the ventilation member 40 and the ventilation hole 55, and the outside air can be taken in. Therefore, the ventilation performance can be further improved. Furthermore, since the ventilation member 40 and the support member 41 are alternately arranged, the new wall drainage board 50 can be screwed in a stable state. In addition, according to the roof repair structure 1 of this embodiment, water that has infiltrated into the inside of the side wall 14 through the ventilation member 40 can be drained to the outside through the ventilation hole 55. In other words, according to the roof renovation structure 1 of this embodiment, drainage performance can be ensured in addition to ventilation performance.

[0042] In addition, the existing roof material 10 is left in place, and the flashing member 20 with water-stopping material, the new roof material 30, and the new wall flashing board 50 are installed on top of it, resulting in a triple waterproof structure and improved waterproof performance. Furthermore, the waterproof double-sided tape 33 is laid on the surface of the flashing member 20 with water-stopping material, so the ventilation member 40 and the support member 41 can be easily adhered to the surface of the flashing member 20 with water-stopping material. In addition, when the new wall flashing board 50 is fixed to the support member 41 and the flashing member 20 with water-stopping material with screws, the waterproof double-sided tape 33 enters the screw holes of the flashing member 20 with water-stopping material, ensuring water-stopping performance.

[0043] Next, the configuration of the roof renovation structure 1b according to the second embodiment will be described with reference to Figures 4 and 5. In the roof renovation structure 1b according to the second embodiment, the shape of the water-stopping material-equipped water-repellent member 25 is different from that of the water-stopping material-equipped water-repellent member 20 of the first embodiment.

[0044] As shown in Figures 4 and 5, the second embodiment of the water-stopping material-attached water-stopping member 25 is a new water-stopping member to be installed on the existing roof material 10, similar to the first embodiment, and includes a water-stopping plate 26 and a water-stopping material 27. The shape of the water-stopping plate 26 is different from that of the first embodiment. The water-stopping plate 26 includes a rising portion 26a, a first flat portion 26b, a step portion 26c, and a second flat portion 26d. The rising portion 21a is bent continuously to the end of the first flat portion 26b on the side wall 14 on the base portion 14a side, and rises upward along the base portion 14a.

[0045] The first flat portion 26b is a horizontal plate portion located on the base end side (base portion 14a side) of the water-repelling board 26, and is placed on the underlaying material 31. The first flat portion 26b is disposed below the surface plate material 14b and the base vertical member 14c of the side wall 14.

[0046] The step portion 26c protrudes upward from the first flat portion 26b and the second flat portion 26d so as to block water from the newly installed roofing material 30. The step portion 26c is formed in a gate-shaped cross section and is formed continuously with the tip of the first flat portion 26b. The protruding height dimension of the step portion 26c is equal to the thickness dimension (thickness of two sheets) of the newly installed roofing material 30. A waterproof double-sided tape 33 for fixing the ventilation member 40 and the support member 41 is laid on the upper surface of the step portion 26c. A support rail 28 is provided on the inside of the step portion 26c. The support rail 28 is a long piece of wood with a rectangular cross section, placed on the underlayment material 31, and abuts against the upper flat portion of the step portion 26c from below.

[0047] The second flat portion 26d is formed continuously with the tip of the step portion 26c, and is flush with the first flat portion 26b. The second flat portion 26d is placed on the underlayment 31, and the side edge of the new roofing material 30 is laid on the upper surface. A sealing material 32 is provided at the base end of the second flat portion 26d. The sealing material 32 is applied between the side edge of the new roofing material 30 and the tip vertical plate portion of the step portion 26c, and prevents water from penetrating under the new roofing material 30.

[0048] The waterproof material 27 is configured, for example, of a packing made of an elastic material, similar to the waterproof material 22 of the first embodiment, and is attached to the surface of the rising portion 26a facing the base portion 14a.

[0049] In this embodiment, the ventilation member 40 and the support member 41 are fixed onto the step portion 26c, and the tips of the ventilation member 40 and the support member 41 are disposed on the side edge portion of the newly installed roof material 30. Note that other configurations are similar to those of the first embodiment, so the same reference numerals are used and the description is omitted.

[0050] When installing the water-stopping material-attached flashing member 25 of the roof renovation structure 1b having such a configuration, the support rail 28 is fixed on the renovation adhesive underlayment 31 first. Then, as in the first embodiment, a worker grasps the second flat portion 26d of the water-stopping material-attached flashing member 25 from the tip side of the second flat portion 26d, and inserts the base end of the water-stopping board 26 (the rising portion 26a, the base end of the first flat portion 26b, and the water-stopping material 27) into the base portion 14a of the side wall 14 through the gap between the lower end of the surface panel material 14b of the side wall 14 and the existing roof material 10. The water-stopping material 27 fixed to the base end of the water-stopping board 26 is pressed against the base portion 14a, and the first flat portion 26b and the second flat portion 26d of the water-stopping board 26 are laid on the renovation adhesive underlayment 31 and fixed with nails or screws.

[0051] According to the roof renovation structure 1b of the second embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained. That is, since the water-stopping material-attached water-repellent member 25 has the step portion 26c, even if a strong wind blows from the newly installed roof material 30 side to the side wall 14 side, the water can be blocked by the step portion 26c. Therefore, the waterproof performance can be further improved.

[0052] Next, the configuration of a roof renovation structure 1c according to a third embodiment will be described with reference to Figures 6 to 9. The roof renovation structure 1c according to the third embodiment differs from the water-stopping material-attached water-repellent member 20 of the first embodiment in that it does not include a ventilation member 40, a support member 41, or a new wall water-repellent board 50 (hereinafter sometimes referred to as "new wall water-repellent board 50, etc.").

[0053] 8 and 9, when there is an existing flashing 18 on the upper edge and side edge of the existing roof material 10, the new wall flashing board 50 and the like can be omitted. The roof renovation structure 1c of the third embodiment includes a flashing member 70 with a water stop plate installed on the existing flashing 18 on the existing roof material 10, and a new roof material 30.

[0054] At the upper end edge of the water gradient of the existing roofing material 10, as shown in FIG. 8, the existing roofing material 10 fixed on the sheathing board 11 via the underlayment material 12 extends to the vicinity of the base part 14a of the side wall 14. The existing flashing 18 is installed on the existing coping board 17a installed on the upper end surface of the existing roofing material 10. The existing flashing 18 has a rising part 18a, a flat part 18b, a falling part 18c, and an overhanging part 18d. The rising part 18a is located at the base end of the existing flashing 18 and rises along the base part 14a. The flat part 18b extends diagonally downward along the existing roofing material 10 and is placed on the existing coping board 17a. The tip of the flat part 18b extends closer to the center of the roof than the base vertical member 14c and the surface board member 14b of the side wall 14. The falling portion 18c is bent downwardly from the tip of the flat portion 18b and covers the tip surface of the existing coping 17a. The protruding portion 18d is bent forwardly from the tip of the falling portion 18c and protrudes along the existing roof material 10.

[0055] As shown in FIG. 6, the flashing member 70 with water-stopping material is a new flashing member to be installed on the existing flashing 18 on the existing roof material 10, and includes a flashing plate 71 and a water-stopping material 72. The flashing plate 71 has a crank-shaped cross section and includes a rising portion 71a, a flat portion 71b, a falling portion 71c, and an overhanging portion 71d. The rising portion 71a is bent continuously to the end of the flat portion 71b on the base portion 14a side of the side wall 14, and rises upward along the base portion 14a of the side wall 14. The flat portion 71b extends diagonally downward along the flat portion 18b of the existing flashing 18. The tip of the flat portion 71b extends closer to the center of the roof than the tip of the flat portion 18b of the existing flashing 18, and is placed on a support rail 73 installed on the overhanging portion 18d of the existing flashing 18. The falling portion 71c is continuous with the tip of the flat portion 71b, bent downward, and covers the upper part of the tip surface of the receiving rail 73. The protruding portion 71d is continuous with the tip of the falling portion 71c, bent forward, and protrudes along the newly installed roof material 30.

[0056] The waterproofing material 72, like the waterproofing material 22 of the first embodiment, is configured, for example, of a packing made of an elastic material, and is attached to the surface of the rising portion 71a facing the base portion 14a.

[0057] The new roofing material 30 is a plate material that is newly installed on the existing roofing material 10 that has not been removed and is left behind. A plurality of new roofing materials 30 are laid on the existing roofing material 10. The modified adhesive underlayment material 31 is configured with an adhesive layer and release paper on the back side of the underlayment material, and is attached to the existing roofing material 10 by peeling off the release paper during construction. The upper end of the modified adhesive underlayment material 31 rises from the surface of the existing roofing material 10 along the support rail 73 and is laid to the surface of the flat part 18b of the existing roofing material 10. The new roofing material 30 is laid on the modified adhesive underlayment material 31 and fixed to the existing roofing material 10 using nails (not shown). The nails extend from the top of the new roofing material 30 through the modified adhesive underlayment material 31 to the sheathing board 11 below. The new roofing material 30 may be laid via an underlayment that does not have an adhesive layer, without using the adhesive modified adhesive underlayment 31. The side edge of the new roofing material 30 is laid extending to the vicinity of the overhanging portion 18d of the existing flashing 18.

[0058] The support rails 73 are fastened with screws to the existing flashing 18 and the existing roof material 10. A sealant 74 is laid on the upper end of the modified adhesive underlayment 31, and serves to adhere the flat surface 71b of the water-stopping material-equipped flashing member 70 to the flat surface 18b of the existing flashing 18 and to provide a water-stopping effect. This provides a double water-stopping effect between the water-stopping material-equipped flashing member 70 and the existing flashing 18 with the water-stopping material 72 and the sealant 74.

[0059] As shown in FIG. 9, at the side edge of the existing roofing material 10, a support rail 17b and an existing gutter 19 are provided under the existing flashing 18. The support rail 17b is installed on the side edge of the sheathing board 11 and the underlayment 12. The existing gutter 19 has a crank-shaped cross section and includes a rising portion 19a, a flat portion 19b, a falling portion 19c, and a protruding portion 19d. The rising portion 19a rises along the base portion 14a. The existing gutter 19 is arranged so that the flat portion 19b and the falling portion 19c cover the support rail 17b. The protruding portion 18d protrudes along the underlayment 12 and penetrates into the underside of the existing roofing material 10. The existing coping 17a of the existing flashing 18 is placed across the flat surface 19b of the existing gutter 19 and the side edge of the existing roof material 10, and the existing flashing 18 is installed to cover this existing coping 17a. By providing the existing flashing 18 on top of the existing gutter 19 in this way, the water-stopping properties are improved.

[0060] 7, in the water-stopping material-attached water-repellent member 70 on the side edge of the existing roof material 10, the rising portion 71a and the flat portion 71b of the water-repellent board 71 are perpendicular to each other, and the flat portion 71b and the protruding portion 71d extend horizontally. The other configurations are the same as those of the water-stopping material-attached water-repellent member 70 on the upper edge, so the same reference numerals are used and the description is omitted.

[0061] A method for constructing a roof renovation structure 1c according to the third embodiment will be described with reference to Figures 6 and 7. The method for constructing such a roof renovation structure 1c includes a new roof installation process and a water-stopping material-equipped water-repellent member installation process.

[0062] The new roof installation process is a process of installing new roofing material 30 on existing roofing material 10. In the new roof installation process, first, the support rails 73 are fixed from the existing roofing material 10 to the existing flashing 18 with screws or nails, and then the repair adhesive underlayment 31 is laid. Then, the new roofing material 30 is laid on top of the repair adhesive underlayment 31.

[0063] The step of installing the flashing member with water-stopping material is a step of installing the flashing member with water-stopping material 70 on the existing roof material 10 and the existing flashing 18 adjacent to the side wall 14. In the step of installing the flashing member with water-stopping material, the water-stopping material 72 is fixed to the rising portion 71a of the flashing board 71 in advance to form the flashing member with water-stopping material 70. At the construction site, a sealant 74 is laid on the tip portion of the repair adhesive underlayment 31 (on the flat portion 18b of the existing flashing 18). A worker grasps the flat portion 71b from the tip side of the protruding portion 71d of the flashing member with water-stopping material 70. Then, the base end of the flashing board 71 is inserted into the base portion 14a of the side wall 14 through the gap between the lower end of the surface panel material 14b of the side wall 14 and the existing flashing 18, and the water-stopping material 72 fixed to the base end of the flashing board 71 is pressed against the base portion 14a. Then, the flat surface portion 71b of the water drainage board 71 is attached to the sealing material 74, and the water drainage member 70 with the water-stopping material is fixed by screws or nails. Through the above steps, the construction of the roof renovation structure 1c is completed.

[0064] According to the roof renovation structure 1c and the construction method thereof of the third embodiment, the provision of the water-stopping material-attached water-stopping member 70 improves the water-stopping performance. A gap exists between the water-stopping material-attached water-stopping member 70 and the lower end of the surface panel material 14b of the side wall 14, so that the side wall ventilation layer 17 inside the side wall 14 can communicate with the outside of the surface panel material 14b. In this embodiment, the newly installed wall water-stopping plate 50 and the like can be omitted, so the configuration of the roof renovation structure 1c can be simplified compared to the first embodiment, and construction work can be saved.

[0065] Also, the drainage member 70 with water-stopping material is easy to install, as in the first embodiment. Specifically, the flat portion 71b of the drainage board 71 is grasped, and the base end of the drainage board 71 is inserted into the base portion 14a through the gap between the lower end of the surface panel material 14b of the side wall 14 and the existing flashing 18. This makes it easy to insert the base end of the drainage board 71 and press the water-stopping material 72 against the base portion 14a, even if the gap between the surface panel material 14b and the existing flashing 18 is small. In other words, the roof renovation structure 1c with ventilation and drainage performance can be easily constructed with simple construction.

[0066] Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate design changes are possible within the scope of the present invention. In the above embodiment, a packing is used as the water-stopping material 22 of the water-stopping material-equipped drainage member 20, but the present invention is not limited to this. For example, other materials such as waterproof tape and sealing material may be used as the water-stopping material.

[0067] In addition, the shape of the drainage member 25 with water-stopping material of the second embodiment is not limited to the above-mentioned shape. As shown in FIG. 10(a), the drainage plate 26 of the drainage member 25 with water-stopping material according to the first modification has a rising portion 26a, a first flat portion 26b, a step portion 26c, and a second flat portion 26d, as in the second embodiment. In the drainage plate 26, the rising portion 26a is inclined toward the base portion 14a of the side wall 14, and the angle formed by the rising portion 26a and the first flat portion 26b is an obtuse angle. The water-stopping material 27 is attached over the entire surface of the rising portion 26a facing the base portion 14a. The other configurations are the same as those in the second embodiment, so the same reference numerals are used and the description is omitted.

[0068] According to this configuration, the drainage member 25 with water-stopping material can be easily inserted into the base portion 14a through the gap between the lower end of the surface panel 14b of the sidewall 14 and the existing flashing 18. Specifically, since the rising portion 26a intersects at an obtuse angle, when the drainage member 25 with water-stopping material is attached, it inclines away from the surface panel 14b as it moves from the first flat portion 26b to the step portion 26c and the second flat portion 26d. Therefore, the drainage member 25 with water-stopping material is unlikely to interfere with the surface panel 14b and can be attached without damaging it. In addition, since the upper portion of the rising portion 26a is close to the base portion 14a, the upper end of the water-stopping material 27 is locally pressed against the base portion 14a, ensuring the necessary water-stopping performance. The configuration in which the falling portion is inclined can also be applied to the water-stopping material-attached drainage member 20 of the first embodiment, and the same effects can be obtained.

[0069] 10(b) shows a second modified example of a drainage member 25 with a water-stopping material. The drainage plate 26 of the drainage member 25 with a water-stopping material has a large rising dimension of the rising portion 26a. Specifically, the rising dimension of the rising portion 26a is the distance between the surface of the surface panel material 14b of the side wall 14 and the surface of the base portion 14a, plus the height dimension of the step portion 26c, plus the clearance dimension. The water-stopping material 27 is attached to the entire surface of the rising portion 26a facing the base portion 14a. The other configurations are the same as those in the second embodiment, so the same reference numerals are used and the description is omitted.

[0070] According to this configuration, when the drainage member with water-stopping material 25 is attached, the rising portion 26a is turned sideways and inserted into the base portion 14a through the gap between the lower end of the surface panel material 14b of the side wall 14 and the existing flashing 18, but when the tip of the rising portion 26a is in contact with the base portion 14a, the step portion 26c does not interfere with the surface panel material 14b. This makes it difficult for the drainage member with water-stopping material 25 to interfere with the surface panel material 14b, and it can be attached without damaging it. In addition, since the rising dimension of the rising portion 26 is large, the contact area between the water-stopping material 27 and the base portion 14a side is large, improving the water-stopping performance. [Explanation of symbols]

[0071] 1 Roof renovation structure 1b Roof renovation structure 1c Roof renovation structure 10 Existing roofing materials 14 Side wall 14a Base 14b Surface plate material 20. Water-stopping material attached to drainage member 21 Drain board 22 Water-stopping material 25 Water-stopping material attached to drainage member 26 Drain board 26c Step 27 Water-stopping material 30 New roofing materials 40 Ventilation material 41 Support member 50 New wall drainage board 55 Ventilation hole 70 Water-stopping material attached to drainage member 71 Drain board 72 Water-stopping material

Claims

1. New roofing material to be installed on top of the existing roofing material; At least one of the upper edge and the side edge of the new roof material adjacent to the side wall is attached to the side wall, The method includes the steps of: (1) providing a new water-stopping material-attached flashing member to be installed on the existing roof material; The water-stopping member includes a water-stopping plate and a water-stopping material fixed to the side wall side of the water-stopping plate, The base end of the water drainage board passes through the gap between the lower end of the surface panel material of the side wall and the existing roof material and enters into the base part of the side wall, The water-stopping material is pressed against the base portion of the side wall. A roof renovation structure characterized by:

2. The water drainage plate of the water-stopping material-attached water drainage member is formed with a step portion that blocks water from the newly installed roof material side. The roof renovation structure according to claim 1 .

3. A ventilation member installed on the water-stopping material-attached water drainage member; A new wall drainage plate is installed so as to cover the ventilation member, The ventilation member is disposed in communication with a side wall ventilation layer that opens at the lower end of the surface plate. The roof renovation structure according to claim 1 or 2.

4. An existing wall water drain is provided on the upper edge and side edge of the existing roof material, The existing wall further includes a support rail installed on the tip of the water drainage board, The water-stopping material-attached water-repellent member is supported by the support rail, and the tip of the water-stopping material-attached water-repellent member is laid on the edge of the newly installed roof material. The roof renovation structure according to claim 1 .

5. A water-stopping member installation process for installing a water-stopping member having a water-stopping plate and a water-stopping material on the existing roof material adjacent to the side wall; A new roof installation process in which a new roof material is installed on the tip of the existing roof material and the water-stopping material-attached water flashing member; A ventilation member installation process in which a ventilation member through which air can pass and a support member for supporting the newly installed wall water-stopping board are installed on the water-stopping member with a water-stopping material at the interface between at least one of the upper edge portion and the side edge portion of the newly installed roof material and the side wall portion; A new wall drainage board installation process for installing the new wall drainage board so as to cover the ventilation member and the support member, and fixing the new wall drainage board to the support member, In the step of installing the water-stopping material-attached water-repellent member, the base end of the water-repellent board is inserted into the base part of the side wall through the gap between the lower end of the surface panel material of the side wall and the existing roof material, and the water-stopping material fixed to the base end of the water-repellent board is pressed against the base part. A method for constructing a roof renovation structure.

6. a new roof installation step of installing a new roof material on the existing roof material adjacent to the side wall; A brace installation process for installing braces on the tip of an existing wall water-repelling board provided on the upper edge and side edge of the existing roof material; A water-stopping member installation process is provided for installing a water-stopping member having a water-stopping plate and a water-stopping material so as to cover the edge of the support rail and the newly installed roof material. In the step of installing the water-stopping material-attached water-repellent member, the base end of the water-repellent board is inserted into the base part of the side wall through the gap between the lower end of the surface panel material of the side wall and the existing roof material, and the water-stopping material fixed to the base end of the water-repellent board is pressed against the base part. A method for constructing a roof renovation structure.

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