Waterproofing structure at the junction of the building's exterior wall material and roofing material

Abstract

This invention provides a weatherproofing structure suitable for a ventilated construction method that has a wall-side ventilation layer between the building frame and the exterior wall material. [Solution] The waterproofing structure is composed of a flashing member 250 and a spacer member 240. The flashing member 250 includes a raised piece provided on the lower end surface of the exterior wall material, an upper cover piece extending from the lower edge of the raised piece in a direction away from the exterior wall material 120 along the roof material 230, a hanging piece extending from the extended end edge of the upper cover piece in a direction approaching the roof material 230, and a lower cover piece extending from the lower end of the hanging piece in a direction away from the exterior wall material 120 along the roof material 230. The spacer member 240 is configured to form a roof surface side ventilation layer that communicates with the wall surface side ventilation layer.

Description

Technical Field

[0001] The present invention relates to a rainproof structure at the joint between the outer wall material and the roof material of a building. The rainproof structure according to the present invention can be applied not only when newly constructing a building but also when renovating the roof of an existing building by a covering method. Further, the rainproof structure according to the present invention is preferably applied to a building adopting a ventilation construction method having a wall surface side ventilation layer between the building frame and the outer wall material.

Background Art

[0002] As described above, the present invention is not limited to being applied only during roof renovation. As a renovation method for an existing roof using a decorative slate roof, there is known a so-called "covering method" in which the existing decorative slate roof is left as it is and a new roof is laid on top of it. In the covering method, an underlay material is laid on the existing roof material, and a new roof material is installed. At the joint portion with the outer wall (side wall) on the water side and the side portion of the pitched roof, a new floor board is provided on the existing wall drip board, and a new wall drip board (corresponding to the rain pressing member in the present invention) is installed so as to cover this floor board.

[0003] In such a covering method, although waterproof performance is ensured, ventilation performance of the side wall is not ensured, and in view of the problem that the ventilation performance of the side wall ensured in the new roof structure is lost after renovation, Japanese Patent Application Laid-Open No. 2024-089494 (Patent Document 1) discloses a roof renovation structure capable of ensuring the ventilation performance inside the side wall.

[0004] The roof repair structure disclosed in Patent Document 1 comprises a new roofing material installed on top of an existing roofing material, a new wall flashing plate installed on top of an existing wall flashing plate at the interface between the upper edge and side edge of the new roofing material and a side wall, a support member that supports the new wall flashing plate, and a damming member that blocks water that has seeped inside the new wall flashing plate, wherein the new wall flashing plate has ventilation holes formed at the end on the new roofing material side, the support members are installed in a plurality at predetermined intervals on top of the existing wall flashing plate, and the damming member is provided between adjacent support members at a position facing the ventilation holes.

[0005] According to the roof repair structure disclosed in Patent Document 1, ventilation performance inside the side wall (the ability to discharge a certain amount of air from inside the side wall to the outside, and the ability to draw in and expel air between the inside and outside of the side wall) is ensured through the gap between adjacent support members. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2024-089494 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, in the roof repair structure disclosed in Patent Document 1, ventilation holes are formed at the end of the new wall flashing on the new roofing material side in order to achieve ventilation performance. Since ventilation holes must be opened in the flashing, which is made of thin steel plate or the like, the shape becomes complex, the number of manufacturing steps increases, and the cost may rise. Furthermore, because such ventilation holes are provided, measures must also be taken to prevent rainwater from entering, and a damming member is provided opposite the ventilation holes to block the rainwater. The need for such measures to prevent rainwater from entering through the ventilation holes may also increase the number of manufacturing steps and the cost may rise.

[0008] This invention was further developed in view of the prior art, and its purpose is to create a new building The objective is to provide a waterproofing structure for the junction between the exterior wall material and the roof material of a building, which can be applied whether a building is being constructed or an existing building's roof is being renovated using a cover method, and which allows for easy communication between the ventilation layer on the wall side and the ventilation layer on the roof side, making it suitable for ventilation construction methods that have a wall-side ventilation layer between the building frame and the exterior wall material. [Means for solving the problem]

[0009] To achieve the above objective, the waterproofing structure according to the present invention employs the following technical means.

[0010] In other words, the rainproofing structure according to the present invention is a rainproofing structure for the joint between an exterior wall material and a roofing material in a ventilated construction method having a wall-side ventilation layer between the building frame and the exterior wall material, wherein the rainproofing structure is composed of a flashing member and a spacer member, the flashing member comprising a raised piece provided on the lower end surface of the exterior wall material, an upper cover piece extending from the lower edge of the raised piece in a direction away from the exterior wall material along the roofing material, a hanging piece extending from the extended edge of the upper cover piece in a direction approaching the roofing material, and a lower cover piece extending from the lower end of the hanging piece in a direction away from the exterior wall material along the roofing material, the spacer member being configured to form a roof-side ventilation layer communicating with the wall-side ventilation layer, and having a roof-side ventilation opening communicating with the roof-side ventilation layer between the extended edge of the lower cover piece and the surface of the roofing material.

[0011] Preferably, the exterior wall material is an existing exterior wall material constructed using a ventilated construction method having a wall-side ventilation layer between the building frame and the exterior wall material, the roofing material is a new roofing material newly installed on top of the existing roofing material, the flashing member is a new flashing member newly installed on top of the existing flashing provided on the existing roofing material, and the spacer member can be configured to form a roof-side ventilation layer communicating with the wall-side ventilation layer between the existing flashing member and the new flashing member.

[0012] More preferably, the end of the roofing material or new roofing material installed adjacent to the exterior wall material or existing exterior wall material on the exterior wall material side may be folded upward to form a rain stopper, and a rain return piece may be formed along the roofing material from the upper end of the rain stopper.

[0013] More preferably, the opening area of ​​the roof-side ventilation layer, extending from the roof-side ventilation opening to the wall-side ventilation layer, can be configured such that the opening area changes at least once, starting from the roof-side ventilation opening.

[0014] More preferably, the opening area of ​​the roof-side ventilation layer, extending from the roof-side ventilation opening to the wall-side ventilation layer, can be configured such that, starting from the roof-side ventilation opening, the relationship is at least small-large-small-large. [Effects of the Invention]

[0015] According to the present invention, it can be applied whether a new building is being constructed or an existing building's roof is being renovated using a cover method, and it can easily connect the ventilation layer on the wall side and the ventilation layer on the roof side, providing a waterproofing structure for the joint between the exterior wall material and the roof material of a building that is suitable for a ventilation construction method having a wall-side ventilation layer between the building frame and the exterior wall material. [Brief explanation of the drawing]

[0016] [Figure 1] This is an external perspective view of a building to which a weatherproofing structure according to an embodiment of the present invention is applied, showing the girder direction shown in Figure 2, the flow direction shown in Figure 4, and the cross-sectional directions in Figures 2 and 4. [Figure 2] Figure 1 shows a cross-sectional view of the cross-section indicated by the dashed line in the girder direction, viewed from the direction of the white arrow. [Figure 3] Figure 2 is a side view (cross-sectional view) of the rain flashing member 250. [Figure 4] Figure 1 shows a cross-sectional view of the cross-section indicated by the dashed line in the flow direction, viewed from the direction of the white arrow. [Figure 5] It is a side view (cross-sectional view) of the rain stopper member 250 in FIG. 4. [Figure 6] It is a side view (cross-sectional view) of the roof member 230 on the most gable side (A), and is a side view (cross-sectional view) of the roof member 235 according to the (B) modification. [Figure 7] It is a view showing the ventilation path in FIG. 2. [Figure 8] It is a view showing the ventilation path in FIG. 4.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, the rain closing structure according to the embodiment of the present invention will be described in detail based on the drawings. As the rain closing structure according to the present invention, the girt direction (FIGS. 2, 3, 7) and the flow direction (FIGS. 4, 5, 8) shown in FIG. 1 will be described respectively. In addition, in these girt direction rain closing structures and flow direction rain closing structures, the common configurations are denoted by the same reference numerals, and the description thereof is common and will not be repeated. Further, the rain closing structure according to the present invention is preferably adopted in a ventilation construction method having a wall surface side ventilation layer between the building frame and the outer wall material. The wall surface side ventilation layer in this ventilation construction method will be described below assuming that the outer wall material is horizontally attached (horizontally tiled) through the vertical edge in both the girt direction and the flow direction to form the wall surface side ventilation layer, but it may be vertically attached (vertically tiled) through the horizontal edge, or a ventilation fitting (the lowermost is a starter ventilation fitting) may be used instead of / in addition to the edge.

[0018] Referring to FIGS. 1, 2, 3, 7, the rain closing structure (girt direction) according to the present embodiment, and referring to FIGS. 1, 4, 5, 8, the rain closing structure (flow direction) according to the present embodiment will be described in detail. As described above, the girt direction and the flow direction are the directions shown by the black lines in FIG. 1, FIG. 2 is a cross-sectional view of the cross-section shown by the dashed-dotted line in the girt direction shown in FIG. 1 as viewed from the direction of the white arrow, and FIG. 4 is a cross-sectional view of the cross-section shown by the dashed-dotted line in the flow direction shown in FIG. 1 as viewed from the direction of the white arrow.

[0019] As shown in these figures (especially FIGS. 2 and 4), the rain stop structure according to the present embodiment is a rain stop structure at the joint between the outer wall material 120 and the roof material 230 in a ventilation construction method having a wall surface side ventilation layer between the building body 100 and the outer wall material 120. This rain stop structure is configured to include a rain pressing member 250 and a spacer member 240. This rain pressing member 250 includes a rising piece 2501 provided on the surface of the lower end portion of the outer wall material, an upper cover piece 2502 extending in a direction separating from the outer wall material 120 along the roof material 230 from the lower end edge of the rising piece 2501, a hanging piece 2503 extending in a direction approaching the roof material 230 from the extending end edge of the upper cover piece 2502, and a lower cover piece 2504 extending in a direction separating from the outer wall material 120 along the roof material 230 from the lower end portion of the hanging piece 2503. And the spacer member 240 is configured to be able to form a roof surface side ventilation layer communicating with the wall surface side ventilation layer. Further, there is a roof surface ventilation port (the portion of the opening area S(1) shown in FIGS. 7 and 8) communicating with the roof surface side ventilation layer between the extending end edge of the lower cover piece 2504 and the surface of the roof material 230. [[ENDENDEND]]

[0020] What is illustrated in the present embodiment is a view of the rain stop structure during roof renovation by the covering method, not at the time of new construction. At the time of this roof renovation, the outer wall material 120 is an existing outer wall material constructed by a ventilation construction method having a wall surface side ventilation layer between the building body 100 and the outer wall material 120. And the roof material 230 (here is Smart Metal (R), a metal roof material) is a new roof material newly laid on the existing roof material 130 (here is Color Best (R), a slate roof material). Further, the rain pressing member 250 is a new rain pressing member newly provided on the existing rain pressing member 150 provided on the existing roof material 130. And the spacer -member 240 is configured to be able to form a roof surface side ventilation layer communicating with the wall surface side ventilation layer between the existing rain pressing member 150 and the new rain pressing member 250.

[0021] As described above, in this embodiment, the diagrams show the waterproofing structure during roof renovation using the cover method, not during new construction. Therefore, in the case of new construction, as shown in Figures 2, 4, 7, and 8, the existing roofing material 130, existing flashing 150, existing coping 160, existing fasteners 170, and existing underlayment 180 (waterproofing sheet) are not present. Instead, the underlayment 210 (waterproofing sheet) is laid on top of the roof decking 140, and the roofing material 230 (metal roofing material in this case) is laid on top of that.

[0022] In the following, the weatherproofing structure (in the girder direction and the flow direction) according to this embodiment will be described in more detail. As shown in Figures 1, 2, 3, and 7, the weatherproofing structure in the girder direction is as shown in Figures 1, 4, 5, and 8, as vertical furring strips 110 are attached to the building frame 100, and horizontally laid exterior wall material 120 is attached via these vertical furring strips 110. These vertical furring strips 110 are provided discontinuously at regular intervals in the front-to-back direction of the paper, for example, in Figures 2 and 4 (whereas the exterior wall material 120 is continuous). The lower end of the vertical furring strips 110 is located above the lower end of the exterior wall material 120, forming a wall-side ventilation layer. This is the same even when horizontal furring strips are attached to the building frame 100 and vertically laid exterior wall material is attached via these horizontal furring strips, in that a wall-side ventilation layer is formed. Furthermore, a ventilation layer can be formed on the wall side by using ventilation fittings (starter ventilation fittings at the bottom) instead of / in addition to furring strips.

[0023] A locking portion 330 is provided at the lower end of the exterior wall material 120 for locking the upright piece 2501 of the flashing member 250. This locking portion 330 is reinforced with a backup material 300 and waterproofed with sealant 310 and upper slope sealant 320. The flashing member 250, with the upright piece 2501 locked to this locking portion 330, is fixed to the coping 260 with fitting fixing nails 280 and fitting fixing nails 270. The coping 260 is fixed to the roof with coping fixing screws 290 (in this case, it is fixed to the existing coping 160). This coping 260 (and the existing coping 160) is provided continuously in the front-back direction of the paper, for example, in Figures 2 and 4. In this embodiment, the flashing member 250 is a two-part structure consisting of a base member 252 equipped with a locking portion 330, and the base member 252 is fixed to the coping 260 with fitting fixing nails 280, but it may also be composed of one part or three or more parts.

[0024] Here, the material of the flashing member 250 will be described. The material of the flashing member 250 is a thin metal sheet. This metal sheet is not limited to, but is a bendable thin metal sheet material, such as iron, aluminum, copper, stainless steel, titanium, aluminum-zinc alloy plated steel sheet, enamel steel sheet, clad steel sheet, laminated steel sheet (PVC steel sheet, etc.), sandwich steel sheet (vibration-damping steel sheet, etc.) (including metal color sheets painted in various colors), which is cut into a predetermined shape, bent as shown in Figures 3 and 5, and attached to the position shown in Figures 2 and 4. The longitudinal length of this flashing member 250 is usually matched to the length of the joint between the exterior wall material 120 and the roof material 230 (length in the front-back direction of the paper in Figures 2 and 4).

[0025] Next, the spacer member 240 will be described. Between the existing flashing member 150 (which does not exist in new construction) and the new flashing member 250, a spacer member 240 is provided to form a roof-side ventilation layer that communicates with the wall-side ventilation layer. A piece of wood is attached to the position of the coping fixing screw 290. This spacer member 240 is provided discontinuously, for example, at a certain interval in the front-back direction of the paper in Figures 2 and 4 (unlike the continuous coping 260). Therefore, the spacer member 240 allows communication with the wall-side ventilation layer. A roof-side ventilation layer is formed. The structure is such that the coping 260 is covered by the upper cover piece 2502 and the hanging piece 2503 of the flashing member 250 shown in Figures 3 and 5. Furthermore, there is a roof surface ventilation opening (the part with opening area S(1) shown in Figures 7 and 8) that communicates with the roof-side ventilation layer between the extended edge of the lower cover piece 2504 of the flashing member 250 and the surface of the roofing material 230.

[0026] As a result, as shown in Figures 7 and 8, a roof-side ventilation layer is formed that communicates with the wall-side ventilation layer through the roof surface ventilation opening (the portion with opening area S(1) shown in Figures 7 and 8), the opening between the lower surface of the coping 260 and the upper surface of the roofing material 230 (the portion with opening area S(2) shown in Figures 7 and 8), the opening between the lower surface of the coping 260 where there are no spacer members 240 and the upper surface of the single-sided waterproof tape 340 (the portion with opening area S(3) shown in Figures 7 and 8, where the opening area in the front-back direction of the paper is the length between the pieces of wood used as spacer members 240 × the height of the pieces of wood), and the opening between the lower surface of the base material 252 and the upper surface of the single-sided waterproof tape 340 (the portion with opening area S(4) shown in Figures 7 and 8).

[0027] In this example, a piece of wood is provided on the underside of the coping 260 as a spacer member 240 (more specifically, the piece of wood is fixed to the coping 260 as a spacer member 240 with coping fixing screws 290). However, a groove for air circulation may be provided on the underside of the coping 260 in the direction along the upper cover piece 2502 of the rain flashing member 250 (in this case, the coping and the spacer member are formed integrally), or a piece of resin or metal other than a piece of wood may be provided.

[0028] Although not directly related to the present invention, the underlayment 210 (waterproof sheet) laid beneath the new roofing material 230 is inserted under the existing flashing member 150 up to the edge of the existing coping 160 to achieve waterproofing. The existing flashing member 150 is fixed to the existing coping 160 with existing fitting fixing nails 170. This underlayment 210 is fastened together with the roofing material 232 one eaves away from the roofing material 230 closest to the ridge using roof screws 200.

[0029] The components shown in Figure 4 but not in Figure 2 will be explained below. A waterproof sealer 400 is provided on the single-sided waterproof tape 340 that abuts against the existing coping 160. The flashing plate 410, which has a folded portion that surrounds the waterproof sealer 400 in a U-shape (left and right reversed) and a flat portion that extends from the folded portion in a direction away from the exterior wall material 120, is attached by roof screws 200 via hangers 420. Except for these, Figure 4 is the same as Figure 2. Note that the flashing plate 410 may also be attached directly by roof screws 200 without using hangers 420.

[0030] Here, the shape of the end portion on the exterior wall material 120 side of the roofing material 230 (or new roofing material in the case of roofing material renovation) that is installed in close proximity to the exterior wall material 120 (or existing exterior wall material in the case of roofing material renovation) (the one closest to the ridge) will be explained with reference to Figure 6.

[0031] The roofing material 230 shown in Figure 6(A) is the roofing material 230 that is installed close to the exterior wall material 120 (closest to the ridge) in the girder-direction waterproofing structure shown in Figures other than Figure 6(B). This roofing material 230 has a flat portion 2302 (roof surface) extending from an engaging portion 2301 that engages with an engaging projection 2321 of the roofing material 232 on the eaves side (lower side), and the end of this flat portion 2302 on the exterior wall material 120 side is folded upward to form a rain-stopping piece 2303. Furthermore, as shown in Figure 6(B), the roofing material 235 used in the girder-direction waterproofing structure may have a rain-returning piece 2304 formed from the upper end of the rain-stopping piece 2303 along (parallel to) the flat portion 2302 of the roofing material 235. It is preferable that the rain-stopping piece 2303, or the rain-stopping piece 2303 and the rain-returning piece 2304, are formed on the roofing material 230 closest to the ridge, as this can firmly prevent the intrusion of rainwater, etc. However, this does not preclude the possibility of constructing the roofing material in a cut-off state without forming the rain-stopping piece 2303.

[0032] Finally, with reference to Figures 7 and 8, the opening area of ​​the roof-side ventilation layer will be explained. The opening area of ​​the roof-side ventilation layer, from the roof-side vent (the portion of opening area S(1) shown in Figures 7 and 8) to the wall-side ventilation layer, changes at least once, starting from the roof-side vent. Alternatively, the opening areas of the roof-side ventilation layer, from the roof-side vent (the portion of opening area S(1) shown in Figures 7 and 8) to the wall-side ventilation layer, maintain at least a small-large-small-large relationship, starting from the roof-side vent. More specifically, opening area S(1), opening area S(3) < opening area S(2), opening area S(4). In this way, if the opening area changes at least once, or if the opening areas have at least a small-large-small-large relationship, the wind speed changes when the opening area of ​​the ventilation layer changes (wind speed decreases when the opening area expands, and wind speed increases when the opening area shrinks), and the wind direction also changes. Therefore, compared to when the same opening area remains, where both the wind speed and wind direction are almost constant and rainwater tends to enter easily, it becomes more difficult for rainwater to enter, which is preferable.

[0033] As described above, the waterproofing structure according to this embodiment can be applied whether a new building is being constructed or an existing building's roof is being renovated using a cover method. It allows for easy communication between the ventilation layer on the wall side and the ventilation layer on the roof side, providing a waterproofing structure for the joint between the exterior wall material and the roof material of a building that is suitable for a ventilation method having a wall-side ventilation layer between the building frame and the exterior wall material.

[0034] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Industrial applicability]

[0035] The present invention is preferable for a waterproofing structure that can be applied whether a new building is being constructed or an existing building's roof is being renovated using a cover method. It is particularly preferable for a waterproofing structure at the junction between the exterior wall material and the roof material of a building, as it facilitates communication between the ventilation layer on the wall side and the ventilation layer on the roof side, and is suitable for a ventilation method that has a wall-side ventilation layer between the building frame and the exterior wall material. [Explanation of Symbols]

[0036] 100 Building structure 110 Vertical furring strips 120 Exterior wall materials 210 Underlayment material 230 Roofing materials 240 Spacer component 250 Rainproofing material 260 Kasagi

Claims

1. In a ventilated construction method having a wall-side ventilation layer between the building frame and the exterior wall material, the waterproofing structure for the joint between the exterior wall material and the roof material is as follows: The aforementioned waterproofing structure is composed of a rain-retaining member and a spacer member, The aforementioned rain-preventing member is, A raised piece provided on the lower end surface of the exterior wall material, An upper cover piece extending from the lower edge of the raised piece in a direction away from the exterior wall material along the roofing material, A hanging piece extending from the extended edge of the upper cover piece in a direction approaching the roofing material, The system includes a lower cover piece that extends from the lower end of the hanging piece in a direction away from the exterior wall material along the roofing material, The spacer member is configured to form a roof-side ventilation layer that communicates with the wall-side ventilation layer, A waterproofing structure for the joint between an exterior wall material and a roofing material, characterized in that there is a roof surface vent between the extended edge of the lower cover piece and the surface of the roofing material that communicates with the roof surface side ventilation layer.

2. The aforementioned exterior wall material is an existing exterior wall material constructed using a ventilated construction method that has a wall-side ventilation layer between the building frame and the exterior wall material, The aforementioned roofing material is a new roofing material that is newly installed on top of the existing roofing material. The aforementioned flashing member is a new flashing member that is newly installed on top of the existing flashing installed on the existing roofing material, The rainproofing structure for the joint between an exterior wall material and a roofing material according to claim 1, characterized in that the spacer member is configured to form a roof-side ventilation layer that communicates with the wall-side ventilation layer between the existing rain-flashing member and the new rain-flashing member.

3. A rainproofing structure for the joint between an exterior wall material and a roofing material according to claim 1 or claim 2, characterized in that the end of the roofing material or new roofing material installed adjacent to the exterior wall material or existing exterior wall material on the exterior wall material side is folded upward to form a rain stopper, and a rain return piece is formed from the upper end of the rain stopper along the roofing material.

4. A waterproofing structure for the joint between an exterior wall material and a roofing material, according to claim 1 or 2, characterized in that the opening area of ​​the roof-side ventilation layer, extending from the roof-side ventilation opening to the wall-side ventilation layer, changes at least once, starting from the roof-side ventilation opening.

5. A waterproofing structure for the joint between an exterior wall material and a roofing material, according to claim 1 or claim 2, characterized in that the opening area of ​​the roof-side ventilation layer extending from the roof-side ventilation opening to the wall-side ventilation layer is at least in a small-large-small-large relationship, starting from the roof-side ventilation opening.

Images