Roof repair structure, and construction method of throating member and roof repair structure

Abstract

To provide a roof repair structure securing ventilation performance and drainage performance of an inside of a side wall as well as preventing reverse flow of rain water to the inside of the side wall.SOLUTION: A roof repair structure includes: a newly constructed roof material 20 installed on an existing roof material 10; at least one of an upper edge part and a side edge part of the newly constructed roof material 20; a newly constructed wall throating plate 50 installed on an existing wall throating plate 16 on a tie-in part of a side wall 14; support members 40 supporting the newly constructed wall throating plate 50; and a weir member 70 stopping water intruded into an inside of the newly constructed throating plate 50, wherein the newly constructed throating plate 50 has ventilation holes 55 formed in an end part of the newly constructed roof material 20 side, the plurality of support members 40 are arranged on the existing wall throating plate 16 with a specific distance therebetween, and the weir member 70 is positioned at a position opposite to the ventilation holes 55 at a space (space S) between adjacent support members 40, 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roof renovation structure, a flashing member, and a method for constructing a roof renovation structure. [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, an adhesive underlayment is laid on top of the existing roofing material, and then the 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 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 not desirable that the ventilation performance of the side walls ensured in the new roof structure is lost after the repair. It is also not desirable that rainwater penetrates into the water drain board and flows back during strong winds such as typhoons.

[0006] Therefore, the objective of the present invention is to provide a roof renovation structure, a drainage member, and a method for constructing a roof renovation structure that can ensure the ventilation and drainage performance inside the side wall while preventing rainwater from flowing back into the side wall. [Means for solving the problem]

[0007] The first invention for solving the above-mentioned problems is a roof renovation structure comprising a new roof material installed on top of an existing roof material, at least one of the upper edge and side edge of the new roof material, a new wall water drainage board installed on top of the existing wall water drainage board at the joint with the side wall, a support member supporting the new wall water drainage board, and a dam member blocking water that has infiltrated inside the new wall water drainage board, wherein the new wall water drainage board has an air hole formed at the end on the new roof material side, the support members are installed in multiple locations at predetermined intervals on the existing wall water drainage board, and the dam member is provided in a position facing the air hole between adjacent support members.

[0008] According to the roof repair structure of the present invention, the ventilation performance inside the side wall can be ensured through the gap between the adjacent support members. 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. In addition, the drainage performance of draining water that has infiltrated into the side wall through the gap between the adjacent support members can be ensured. Furthermore, since the new roof material is installed on the existing roof material, waterproof performance can also be ensured. By providing the damming member opposite the ventilation hole, even if rainwater or the like infiltrates through the ventilation hole, it can be blocked by the damming member. Therefore, it is possible to prevent rainwater from flowing back into the inside of the side wall.

[0009] In the roof repair structure of the present invention, the new wall water drainage board has a rising board part that rises along the side wall against which the existing roof material abuts, a top board part that covers the top surface of the support member, and an end board part that covers the end surface of the support member on the side of the new roof material, and the ventilation hole is preferably formed in the end board part, and the dam member is attached to the underside of the top board part. With this configuration, air that has passed around the dam member in the gap between adjacent support members can be efficiently discharged from the ventilation space to the outside, thereby improving ventilation performance.

[0010] In the roof repair structure of the present invention, it is preferable that the damming member has a U-shaped cross section and includes a contact plate portion that contacts the lower surface of the upper plate portion and an opposing plate portion that is bent relative to the contact plate portion and faces the air vent. With this configuration, the configuration of the damming member is simplified and it is easy to install the damming member on the newly constructed wall water drainage plate.

[0011] In the roof repair structure of the present invention, it is preferable that the air vent has a horizontally long slit shape and is spaced apart from the lower end of the end panel portion above. With this configuration, rainwater is less likely to seep into the new wall through the air vent.

[0012] The second invention for solving the above-mentioned problem is a water-repellent member used to join at least one of the upper edge and side edge of a newly installed roof material to be installed on an existing roof material to a side wall, the water-repellent member comprising: a new wall water-repellent plate to be installed on top of the existing wall water-repellent plate; and a damming member to block water that has infiltrated inside the new wall water-repellent plate, the new wall water-repellent plate having a rising plate portion that rises along the side wall to which the existing roof material abuts, an upper plate portion that extends horizontally continuous with the lower end of the rising plate portion, and an end plate portion that hangs down continuous with the tip of the upper plate portion, the end plate portion having an air vent formed therein to connect the inside and outside of the newly installed wall water-repellent plate, and the damming member being attached to the underside of the upper plate portion at a position opposite the air vent.

[0013] According to the water drainage member of the present invention, the ventilation performance inside the side wall can be ensured through the ventilation hole. By providing the blocking member opposite the ventilation hole, even if rainwater or the like infiltrates through the ventilation hole, the blocking member can block the infiltration, thereby preventing the backflow of rainwater into the inside of the side wall.

[0014] In the drainage member of the present invention, it is preferable that the damming member has a cross section in a V shape and includes a contact plate portion that contacts the lower surface of the upper plate portion and an opposing plate portion that is bent relative to the contact plate portion and faces the air hole. With this configuration, the configuration of the damming member is simplified and it is easy to install the damming member on the newly constructed wall drainage plate.

[0015] The third invention for solving the above-mentioned problem is a method for constructing a roof renovation structure, comprising: a new roof installation process for installing a new roof material on an existing roof material; a drainage member formation process for forming a drainage member by attaching a dam member facing the air hole to a new wall drainage board having an air hole formed at the end of the new roof material; a support member installation process for installing a plurality of support members at intervals on the existing wall drainage board at the interface between at least one of the upper edge and side edge of the new roof material and the side wall portion; and a drainage member installation process for installing the new wall drainage board on the support members so that the dam member is positioned between adjacent support members.

[0016] According to the method for constructing a roof repair structure of the present invention, the ventilation performance inside the side wall can be ensured through the gap between adjacent support members. In addition, the drainage performance of draining water that has infiltrated into the side wall through the gap between adjacent support members can also be ensured. Furthermore, since the new roof material is installed on the existing roof material, waterproof performance can also be ensured. Even if rainwater or the like infiltrates through the air vent, it can be blocked by the damming member, so that the backflow of rainwater into the inside of the side wall can be prevented. In addition, the damming member is attached in advance to the new wall water drain board to form the water drain board, and then the water drain board (the new wall water drain board with the damming member fixed thereto) is installed, so that the labor and time required for on-site construction can be reduced. Effect of the Invention

[0017] According to the roof renovation structure, water drainage member, and method of constructing a roof renovation structure of the present invention, it is possible to ensure the ventilation and drainage performance inside the side wall, and to prevent rainwater from flowing back into the side wall. [Brief description of the drawings]

[0018] [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] This is a cross-sectional view of the roof renovation structure related to the first embodiment of the present invention as viewed from the girder direction. [Diagram 3] 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. [Figure 4] This is an oblique view showing a water drainage member of a roof renovation structure relating to the first embodiment of the present invention. [Diagram 5] (a) is a cross-sectional view showing the existing roof material, and (b) is a cross-sectional view showing the state after the repair adhesive underlayment has been laid during the new roof installation process of the method for constructing a roof repair structure relating to the first embodiment of the present invention. [Figure 6] 1(a) is a cross-sectional view showing the state in which a new roof material has been laid during the new roof installation process of the method for constructing a roof repair structure relating to the first embodiment of the present invention, and 1(b) is a cross-sectional view showing the double-sided tape laying process. [Figure 7] FIG. 1(a) is a cross-sectional view showing the installation of a support member in the method for constructing a roof repair structure relating to the first embodiment of the present invention, and FIG. 1(b) is a cross-sectional view showing the water drainage member installation process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The roof renovation structure, the water drainage member, and the method for constructing the roof renovation structure 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 renovation structure and the water drainage member 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 to 3, the roof renovation structure 1 includes a new roof material 20 installed on the existing roof material 10, a support member 40, a new wall water drainage board 50, a dam member 70, and a joint water drainage board 60.

[0020] The existing roofing material 10 is a board material constructed before the renovation, and 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 14a of the side wall 14 and rises a predetermined height along the base 14a. Specifically, the rise dimension of the underlayment material 12 is about 200 mm, and rises about 50 mm higher than the upper end of the rising part 16a of the existing wall water-repelling board 16 described later. At the upper edge and side edge of the existing roofing material 10 in the water gradient direction, a coping 15 is laid at the joint with the side wall 14, and the existing wall water-repelling board 16 is installed on the coping 15. The rising portion 16a at the upper end of the existing wall water drainage board 16 is disposed inside the base vertical member 14c of the surface panel member 14b of the side wall 14. The base vertical members 14c are disposed on the back side of the surface panel member 14b with a predetermined interval between them. 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 new roofing material 20 is a plate material that is newly installed on the existing roofing material 10 that has not been removed and is left in place. A plurality of new roofing materials 20 are laid on the existing roofing material 10 via a modified adhesive underlayment 21. The modified adhesive underlayment 21 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 21 is laid from the surface of the existing roofing material 10 to the surface of the existing wall water-repelling board 16. The new roofing material 20 is adhered to the existing roofing material 10 with the modified adhesive underlayment 21, and is fixed to the existing roofing material 10 and the sheathing board 11 with a nail. The tip of the nail extends through the existing roofing material 10 to the sheathing board 11. The new roofing material 20 may be laid through an underlayment without an adhesive layer, without using the adhesive modified adhesive underlayment 21. The upper edge (hereinafter sometimes referred to as the "upper edge") and side edge of the new roofing material 20 in the water gradient direction 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 water-repelling board 16. A sealant 22 is laid on the surface of the upper edge and side edge of the new roofing material 20. The sealant 22 is an amorphous sealant that covers the upper edge and side edge of the new roofing material 20 and the vertical plate portion 16c of the existing wall water-repelling board 16, and is provided along the longitudinal direction of the vertical plate portion 16c. The sealant 22 is provided so as to fill the gap between the vertical plate portion 16c of the existing wall water-repelling board 16 and the new roofing material 20.

[0022] The support member 40 is a member that supports the new wall drainage board 50, and is made of block-shaped wood. As shown in FIG. 4, the support member 40 has a long rectangular parallelepiped shape extending in the longitudinal direction of the existing wall drainage board 16, and a plurality of support members 40 are laid at predetermined intervals along the longitudinal direction of the existing wall drainage board 16. The support member 40 is laid on the upper surface of the portion of the horizontal board portion 16b of the existing wall drainage board 16 near the tip end and protruding outward from the surface board material 14b of the side wall 14. The support member 40 is temporarily fixed to the existing wall drainage board 16 via a waterproof double-sided tape 31 laid on the horizontal board portion 16b of the existing wall drainage board 16. The support member 40 is fixed by a nail or a screw (not shown) that is driven downward from the upper surface. The nail or the screw penetrates the waterproof double-sided tape 31 and extends downward. The waterproof double-sided tape 31 is not necessarily required, and may not be provided in some cases.

[0023] The support members 40 provided on the new wall water drainage board 50 provided along the side edge of the new roof material 20 are preferably inclined (not shown) 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. This prevents water that has flowed between the vertically adjacent support members 40, 40 from flowing toward the side wall 14. The side surface of the support member 40 on the upper side of the water gradient may not be inclined.

[0024] 1 to 3, the new wall flashing 50 is a flashing material that covers the support member 40 and the space S between the adjacent support members 40, 40 above the existing wall flashing 16, and directs water that has flowed down the surface of the side wall 14 onto the new roof material 20. As also shown in FIG. 5, the new 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.

[0025] 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. Note that the new-wall drainage board 50 may have a shape that does not include the lip portion 54 at the upper end of the rising plate portion 51.

[0026] The upper plate portion 52 is a portion that covers the upper surface of the support member 40 and the space S between the adjacent support members 40, 40. The upper plate portion 52 is formed continuously with the lower end of the rising plate portion 51, and is bent toward the new roof material 20 side with respect to the rising plate portion 51. The upper plate portion 52 of the new wall water drainage board 50 provided on the upper edge portion of the new roof material 20 is bent at an obtuse angle with respect to the rising plate portion 51, and the tip side is inclined diagonally downward (see FIG. 2). The upper plate portion 52 of the new wall water drainage board 50 provided on the side edge portion of the new roof material 20 is bent at a right angle with respect to the rising plate portion 51 (see FIG. 3). The upper plate portion 52 is fixed by screws from the portion covering the support member 40 toward the support member 40 and the existing wall water drainage board 16. At this time, the tip of the screw penetrates the horizontal board portion 16b of the existing wall water drainage board 16, but because waterproof double-sided tape 31 has been laid on the surface of the horizontal board portion 16b, the gap between the screw and the screw hole formed in the horizontal board portion 16b is blocked by the waterproof double-sided tape 31, ensuring waterproofing.

[0027] The end panel portion 53 is a portion that covers the end face of the support member 40 facing the newly installed roof material 20 and the space S between adjacent support members 40, 40 from the newly installed roof material 20 side. 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 face of the support member 40. An air hole 55 is formed in the end panel portion 53.

[0028] The ventilation holes 55 are holes for ventilating the air in the side wall ventilation layer 17 of the side wall 14 to the outside, and are arranged at a position facing the space S, and are not formed at a position facing the support member 40. The ventilation holes 55 also have the function of draining water that has infiltrated into the side wall 14. The ventilation holes 55 have a horizontally long slit shape, and are formed at a predetermined interval along the longitudinal direction of the new wall water drainage board 50. The ventilation holes 55 are formed at the lower end of the end panel portion 53, and are arranged at a constant interval (the same interval as the height dimension of the ventilation holes 55) from the lower end of the end panel portion 53 upward. A skirt portion 56 that covers the sealing material 22 is formed at the lower end of the end panel portion 53. The skirt portion 56 is formed continuously with the lower end of the end panel portion 53, bent at an obtuse angle with respect to the end panel portion 53, and the tip side is inclined diagonally downward. The tip of the skirt portion 56 abuts or is close to the surface of the newly installed roof material 20. The skirt portion 56 and the sealing material 22 inside it prevent rainwater and the like from flowing back toward the support member 40. In addition, the ventilation holes 55 are formed at a certain height from the lower end of the end panel portion 53, which prevents the infiltration of rainwater and the like blown in from the downstream side and prevents a decrease in rigidity.

[0029] The blocking member 70 is a member that blocks rainwater and the like that has infiltrated into the new-wall water-shedding board 50 from the air vent 55, and prevents the backflow of rainwater and the like into the inside of the side wall 14. The blocking member 70 is provided at a position facing the air vent 55 in the space S between the adjacent support members 40, 40. The blocking member 70 has a V-shaped cross section and extends along the longitudinal direction of the new-wall water-shedding board 50. The blocking member 70 has a longitudinal dimension larger than the width of the air vent 55, and is disposed across the multiple air vents 55. The blocking member 70 includes an abutting plate portion 71 and an opposing plate portion 72. The abutting plate portion 71 is a plate-shaped portion that abuts against the lower surface of the upper plate portion 52, and is disposed along the upper plate portion 52. The contact plate portion 71 is fixed to the upper plate portion 52 by welding or by screwing. The opposing plate portion 72 is bent at an obtuse angle with respect to the contact plate portion 71 and extends diagonally downward. The opposing plate portion 72 faces the air vent hole 55 and covers the inner portion of the air vent hole 55. It is preferable that the tip portion of the opposing plate portion 72 is located lower than the lower end portion of the air vent hole 55.

[0030] The damming member 70 is fixed to the upper plate portion 52 in advance at a factory or at a construction site before the installation of the new-wall water-repelling board 50. The new-wall water-repelling board 50 and the damming member 70 constitute an integrated water-repelling member 80.

[0031] 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.

[0032] Next, a method for constructing the roof renovation structure 1 according to this embodiment will be described with reference to Figures 5 to 7. The method for constructing the roof renovation structure 1 includes a new roof installation step, a flashing member formation step, a double-sided tape installation step, a ventilation member installation step, a flashing member installation step, and a joint flashing board installation step.

[0033] The new roof installation process is a process of installing a new roofing material 20 on an existing roofing material 10. As shown in (a) of FIG. 5, the existing roofing material 10 is laid on a sheathing board 11 via an underlayment material 12. A coping 15 is laid at the joint between the existing roofing material 10 and the side wall 14, and an existing wall water-repellent board 16 is installed on the coping 15. To install the new roofing material 20, first, as shown in (b) of FIG. 5, a repair adhesive underlayment material 21 is laid on the existing roofing material 10. The tip of the repair adhesive underlayment material 21 rises along the vertical board portion 16c of the existing wall water-repellent board 16 and extends to the upper surface of the horizontal board portion 16b. Then, as shown in (a) of FIG. 6, a new roofing material 20 is laid on the repair adhesive underlayment material 21, and a sealant 22 is applied to the end of the new roofing material 20. The sealant 22 is applied so as to cover the gap between the edge of the new roof material 20 and the vertical plate portion 16 c of the existing wall flashing board 16 .

[0034] The water-draining member forming process is a process of attaching a damming member 70 to a newly-constructed wall water-draining board 50 to form a water-draining member 80, as shown in Fig. 4. In the water-draining member forming process, the damming member 70 is fixed to the upper plate portion 52 of the newly-constructed wall water-draining board 50 in advance at a factory or construction site before the new wall water-draining board 50 is installed. Specifically, the abutment plate portion 71 is abutted against the lower surface of the upper plate portion 52 at a position corresponding to the rear of the air hole 55, and fixed by welding or screwing.

[0035] The double-sided tape laying process is a process of laying a waterproof double-sided tape 31 on the existing wall water-repelling board 16 at the joint between the upper edge and side edge (upper edge is shown in FIG. 6) of the new roofing material 20 and the side wall 14, as shown in FIG. 6(b). The waterproof double-sided tape 31 is for adhering the support member 40 to the existing wall water-repelling board 16, and is attached to the upper surface of the horizontal board portion 16b of the existing wall water-repelling board 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 material 21 laid on the horizontal board portion 16b, and extends to the tip of the horizontal board portion 16b. Note that the waterproof double-sided tape 31 may not be laid. In this case, the double-sided tape laying process is omitted.

[0036] The support member installation step is a step of installing a support member 40 on the waterproof double-sided tape 31, as shown in (a) of FIG. 7. In the support member installation step, the support member 40 is installed and temporarily fixed to the waterproof double-sided tape 31 near the tip of the horizontal plate portion 16b that is on the outer side of the side wall 14. Then, the support member 40 is fixed by driving a nail or a screw (not shown) from the top surface downward. The nail or the screw penetrates the waterproof double-sided tape 31 and is driven downward. The tip of the nail or the screw penetrates the waterproof double-sided tape 33 on the surface, so that the gap between the nail hole and the nail (the screw hole and the screw) is filled with the waterproof double-sided tape 33, thereby ensuring waterproofing.

[0037] The water-repellent member installation process is a process of installing the new wall water-repellent board 50 on the support member 40 so that the damming member 70 is located in the space S between the adjacent support members 40, 40, as shown in FIG. 7(b). In the water-repellent member installation process, the new wall water-repellent board 50 is installed so that the upper plate portion 52 covers the support member 40, and the new wall water-repellent board is fixed to the support member 40 and the side wall 14. Specifically, the rising plate portion 51 of the new wall water-repellent board 50 is abutted against the surface plate material 14b of the side wall 14 and nailed or screwed, and the upper plate portion 52 is placed on the support member 40 and nailed or screwed. A sealant is provided at the recessed corner formed by the side wall 14 and the lip portion 54. The tip portion of the nail or screw penetrates the support member 40 and the horizontal plate portion 16b of the existing wall water-repellent board 16. The gap between the nail hole and the nail or the gap between the screw hole and the screw formed in the horizontal board portion 16b is blocked with a waterproof double-sided tape 31. The end panel portion 53 of the new wall water-repelling board 50 covers the end face of the support member 40 on the side of the new roof material 20 and covers the front of the space S between the adjacent support members 40, 40. Since the end panel portion 53 has an air hole 55, the side wall air layer 17 of the side wall 14 is connected to the gap under the dam member 70 in the space S and to the outside air through the air hole 55. Therefore, the air permeability between the inside of the side wall 14 and the outside can be secured. In addition, since the dam member 70 covers the inside of the air hole 55, the water that has entered through the air hole 55 can be prevented from flowing toward the side wall 14.

[0038] The joint drainage board installation process is a process of installing a joint drainage board 60 above the newly-constructed wall drainage board 50. In the joint drainage board installation process, as shown in FIG. 2, the abutment plate portion 61 of the joint drainage board 60 is bonded to the surface plate material 14b of the side wall 14 above the newly-constructed wall drainage board 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 drainage board 60 to cover the upper end portion of the newly-constructed wall drainage board 50, thereby preventing water from flowing to the upper end portion of the newly-constructed wall drainage board 50. Once the joint drainage board 60 is installed, the construction of the roof renovation structure 1 is completed.

[0039] According to the roof renovation structure 1, the water drainage member 80, and the method for constructing the roof renovation structure of this embodiment, the ventilation performance between the inside and outside of the side wall 14 can be ensured through the space S between the adjacent support members 40, 40 (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, the end panel portion 53 of the new wall water drainage board 50 has a vent hole 55 formed therein, so that the space S can be connected to the outside air. Furthermore, since the dam member 70 is fixed to the lower surface of the upper panel portion 52 of the new wall water drainage board 50, the air in the side wall 14 can be efficiently discharged to the outside through the gap below the dam member 70 in the space S and the vent hole 55, and the outside air can be taken in. Therefore, the ventilation performance can be further improved. Furthermore, since the support members 40 are arranged at regular intervals, the newly installed wall drip board 50 can be nailed or screwed in a stable manner.

[0040] In addition, in this embodiment, water that has entered the inside of the side wall 14 through the gap in the space S below the damming member 70 can be drained to the outside through the ventilation holes 55. That is, drainage performance can be ensured in addition to ventilation performance. Furthermore, by providing the damming member 70 opposite the ventilation hole 55, even if rainwater or the like seeps in through the ventilation hole 55, the damming member 70 can block the infiltration. Therefore, it is possible to prevent rainwater from flowing back into the side wall 14. In this embodiment, the damming member 70 is formed longer than the width of the ventilation hole 55, so that the damming performance of rainwater or the like is improved.

[0041] The damming member 70 has a V-shaped cross section and is configured to include an abutting plate portion 71 and an opposing plate portion 72, which simplifies the configuration of the damming member 70, facilitating the manufacture of the damming member 70 and facilitating the installation of the damming member 70 on the newly constructed wall water drainage board 50. Furthermore, the damming member 70 can be cut on-site, improving workability. The ventilation hole 55 has a horizontally long slit shape and is arranged at a distance above the lower end of the end panel portion 53, making it difficult for rainwater to penetrate through the ventilation hole 55 into the interior of the newly installed wall drainage board 50.

[0042] In addition, since the existing roof material 10 is left in place and the new roof material 20 and new wall flashing board 50 are installed on top of it, the waterproof structure is doubled and waterproof performance can be improved. Also, since the waterproof double-sided tape 31 is laid on the surface of the existing wall flashing board 16, the support member 40 can be temporarily fixed to the surface of the existing wall flashing board 16 and nailed or screwed in a stable state. Furthermore, when the new wall flashing board 50 is nailed or screwed to the support member 40 and the existing wall flashing board 16, the waterproof double-sided tape 31 enters the nail hole or screw hole of the existing wall flashing board 16, ensuring watertightness.

[0043] 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. For example, in the first embodiment, the vent hole 55 of the new wall drainage board 50 is a horizontally long slit shape, but the shape of the vent hole is not limited to this. For example, it may be a vertically long slit shape or a circular shape. In the above embodiment, the vent holes 55 are formed only in the portion corresponding to the space S between the adjacent support members 40, 40, but this is not limited thereto, and the vent holes 55 may be formed at predetermined intervals over the entire length of the new wall drainage board 50. With this configuration, the installation position of the damming member 70 can be freely changed.

[0044] Furthermore, in the above embodiment, the damming member 70 has a V-shaped cross section, but is not limited to this. For example, the damming member 70 may have an L-shaped cross section in which the angle between the contact plate portion and the opposing plate portion is a right angle, or may have another shape such as a gate-shaped cross section or a square-shaped cross section. [Explanation of symbols]

[0045] 1 Roof renovation structure 10 Existing roofing materials 14 Side wall 16 Existing wall drainage board 20 New roofing materials 31 Waterproof double-sided tape 40 Support member 50 New wall drainage board 51 Rising plate 52 Top plate part 53 End plate part 55 Ventilation hole 60 Joint drainage board 70 Damming member 71 Contact plate part 72 Opposing plate 80 Water drainage parts S Space (between adjacent supports)

Claims

1. New roofing material to be installed on top of the existing roofing material; The new roofing material is fitted with at least one of the upper edge and side edge of the new roofing material, a new wall water-repellent board that is installed on top of the existing wall water-repellent board at the joint with the side wall, a support member that supports the new wall water-repellent board, and a dam member that blocks water that has infiltrated inside the new wall water-repellent board. The new wall water drainage board has an air hole formed at the end portion on the new roof material side, The support members are installed at a predetermined interval on the existing wall water drainage board, The blocking member is provided at a position facing the air hole between the adjacent support members. A roof renovation structure characterized by:

2. The new wall water drainage board has a rising board portion that rises along the side wall against which the existing roof material abuts, a top board portion that covers the top surface of the support member, and an end board portion that covers the end surface of the support member on the side of the new roof material, The ventilation hole is formed in the end plate portion, The damming member is attached to the lower surface of the upper plate portion. The roof renovation structure according to claim 1 .

3. The dam member has a V-shaped cross section and includes a contact plate portion that contacts the lower surface of the upper plate portion and an opposing plate portion that is bent relative to the contact plate portion and faces the air hole. The roof renovation structure according to claim 2 .

4. The air vents have a horizontally long slit shape and are disposed above the lower end of the end plate portion at intervals. The roof renovation structure according to claim 3.

5. A water flashing member used to connect at least one of the upper edge and side edge of a new roof material to be installed on an existing roof material with a side wall, The new wall drainage board is installed on the existing wall drainage board, and a damming member is provided to block water that has infiltrated inside the new wall drainage board. The new wall water drainage board has a rising board portion that rises along the side wall against which the existing roof material abuts, an upper surface board portion that extends horizontally from the lower end of the rising board portion, and an end surface board portion that hangs down continuously from the tip of the upper surface board portion, The end plate portion is formed with an air hole that communicates the inside and outside of the new wall water drainage plate, The blocking member is attached to the lower surface of the upper plate portion at a position facing the air hole. A water draining member characterized by:

6. The dam member has a V-shaped cross section and includes a contact plate portion that contacts the lower surface of the upper plate portion and an opposing plate portion that is bent relative to the contact plate portion and faces the air hole.

6. The drainage member according to claim 5.

7. A new roof installation process involves installing new roofing materials on top of the existing roofing materials; A drainage member forming process for forming a drainage member by attaching a dam member facing the vent hole to a new wall drainage board having a vent hole formed at an end portion on the new roof material side; A support member installation process for installing a plurality of support members at intervals on the existing wall water drainage board 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; and a water drainage member installation process for installing the new wall water drainage board on the support member so that the damming member is located between the adjacent support members. A method for constructing a roof renovation structure.

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