Corner valley cover and corner valley structure including corner valley cover

Abstract

To provide a corner valley cover that can be installed in each stage of a plurality of pairs of roof materials where a pair of roof materials extending in a roof lateral direction on a pair of sheathing roof boards positioned on both sides while sandwiching a corner valley are arranged in a plurality of stages in a roof longitudinal direction, and covers an end boundary on the corner valley side of the pair of roof materials, which improves weathering.SOLUTION: A corner valley cover 20 includes: a first cover part 211 which faces the upper face of a roof material 111 arranged on one side while sandwiching a corner valley 6; a second cover plate part 212 which is arranged on the other side while sandwiching the corner valley 6 and faces the upper surface of the roof material 112; and an intermediate cover part 213 which is arranged in such a manner as to connect the end edge parts on the corner valley side of the first cover part 211 and the second cover plate part 212, and straddle the upper side of the corner valley 6. The upper face of the intermediate cover part 213 is composed of a flat surface having a width in a corner valley orthogonal direction horizontally orthogonal to the extension direction of the corner valley 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a corner valley cover and a corner valley structure including the corner valley cover. [Background technology]

[0002] Conventionally, a corner valley cover has been known that can be set on each of multiple pairs of roofing materials, each of which is formed by arranging a pair of roofing materials extending laterally across the roof in multiple rows in the vertical direction of the roof on a pair of sheathing boards located on both sides of a corner valley, and that covers the end boundary of the pair of roofing materials on the corner valley side (see, for example, Patent Document 1 below). This corner valley cover functions as both a decorative material and a connecting material. Specifically, the corner valley cover has a pair of flat plate portions that face the upper surfaces of the pair of roofing materials located on both sides of the corner valley. The upper surfaces of the pair of flat plate portions intersect above the corner valley in a V-shaped cross section (see Figure 15 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 06-307030 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional corner valley cover shown in Patent Document 1 has a problem in that the upper surfaces of the pair of flat plate sections that make up the corner valley cover intersect in a V-shaped cross section, resulting in poor rainproofing (rainwater drainage). That is, with the conventional corner valley cover, rainwater is guided to the bottom edge of the V-shaped valley formed by the pair of flat plate sections and accumulates at the bottom edge of the valley. As a result, some of the rainwater that accumulates at the bottom edge of the valley overflows, or when the rainwater that accumulates at the bottom edge of the valley drains from the downstream end of the valley, it skips over the intended discharge location (for example, a gutter located near the downstream end of the corner valley), preventing the rainwater from being discharged along the intended drainage path.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a corner valley cover and a corner valley structure that are excellent in weatherproofing. [Means for solving the problem]

[0006] The corner valley cover of the first invention can be installed on each tier of multiple pairs of roofing materials, each of which extends laterally across the roof and is arranged in multiple tiers in the vertical direction of the roof on a pair of sheathing boards located on both sides of a corner valley.The corner valley cover covers the end boundary on the corner valley side of the pair of roofing materials, and comprises a first cover portion facing the upper surface of the roofing material located on one side of the corner valley, a second cover portion facing the upper surface of the roofing material located on the other side of the corner valley, and an intermediate cover portion that connects the corner valley side end edges of the first cover portion and the second cover portion and is arranged to straddle the upper side of the corner valley, and the upper surface of the intermediate cover portion consists of a flat surface having a width in the corner valley orthogonal direction, which is horizontally perpendicular to the extension direction of the corner valley.

[0007] According to the first aspect of the present invention, the upper surface of the intermediate cover plate of the corner valley cover is formed as a flat surface having a width in the direction perpendicular to the horizontal, which is perpendicular to the extension direction of the corner valley, so that rainwater flowing on the upper surface of the intermediate cover plate can be evenly dispersed in the width direction of the intermediate cover plate (the direction perpendicular to the horizontal).This prevents rainwater from overflowing on the upper surface of the corner valley cover and prevents an excessive increase in the flow rate of rainwater, thereby improving rainproofing.

[0008] In the corner valley cover according to the second invention, in the first invention, it is preferable that the underwater edge of the intermediate cover portion extends linearly in a direction perpendicular to the corner valley.

[0009] According to the second aspect of the present invention, the flow rate of rainwater flowing from the underwater edge of the intermediate cover plate to the underwater side can be made uniform across the entire width. That is, according to the above configuration, the underwater edge of the intermediate cover plate extends linearly across the width of the intermediate cover plate (the direction perpendicular to the valley). This makes it possible to make the outflow rate of rainwater uniform across the entire width of the underwater edge of the intermediate cover plate. This suppresses unevenness in the flow rate of rainwater on the upper surface of the intermediate cover plate, allowing the rainwater to be dispersed uniformly across the width of the intermediate cover plate, thereby improving weatherproofing. Furthermore, by forming the underwater edge of the intermediate cover plate linearly, the below-described underwater embracing engagement portion connected to the underwater edge can be easily formed (without creating a weak portion) by bending a sheet metal member.

[0010] The corner valley structure according to the third invention is a corner valley structure comprising a plurality of corner valley covers each comprising the corner valley cover according to the first or second invention, and a plurality of pairs of roofing materials, wherein each of the roofing materials has a roof underwater engaging portion located at the underwater edge of each of the roofing materials and having a recess that opens to the abovewater side on the underside of each of the roofing materials, and a roof abovewater engaging portion located at the abovewater edge of each of the roofing materials and having a recess that opens to the belowwater side on the upper side of each of the roofing materials, and the roof underwater engaging portion and the roof abovewater engaging portion of adjacent roofing materials engage with each other by meshing the recesses, thereby enabling connection in the vertical direction of the roof. The corner valley cover has a cover main body portion including the first cover portion, the second cover portion, and the intermediate cover portion, and a cover above-water side engaging portion connected to the above-water side edge portion of the cover main body portion and engaging with the roof above-water side engaging portions of the pair of roof materials arranged on the same tier as the corner valley cover so as to overlap from the inside of the recess, and the roof above-water side engaging portions of the pair of roof materials and the cover above-water side engaging portions of the corner valley cover overlapping the inside of the recess are configured to engage with the inside of the recesses of the roof below-water side engaging portions of a pair of roof materials arranged on the adjacent tier above the water side of the tier on which the pair of roof materials are located.

[0011] According to the third invention, the roof above-water side engaging portion of the roof material and the cover above-water side engaging portion of the corner valley cover that engages with the inside of the recess thereof are engaged with the inside of the recess of the roof below-water side engaging portion of the roof material arranged on the adjacent tier above the water on the tier on which the corner valley cover is located, thereby simplifying the engaging structure for attaching the corner valley cover to the roof material and reducing the number of parts.

[0012] The corner valley structure of the fourth invention is preferably the third invention, wherein the corner valley cover is connected to the underwater edge portion of the intermediate cover portion of the cover main body portion and further has an underwater embracing engagement portion that engages with the roof underwater engagement portions of the pair of roof materials arranged at the same level as the corner valley cover by embracing them from the outside.

[0013] According to the fourth aspect of the present invention, the underwater side embracing engagement portion connected to the underwater side edge of the intermediate cover plate engages with the underwater side engagement portions of the pair of roofing materials from the outside, thereby firmly connecting the underwater side end of the corner valley cover to the pair of roofing materials. Furthermore, when assembling the corner valley cover, the underwater side embracing engagement portion engages with the underwater side engagement portions of the pair of roofing materials to position the corner valley cover, thereby suppressing variation in the position of the corner valley cover and improving the external design.

[0014] The corner valley structure of the fifth invention is, in the fourth invention, such that the underwater side embracing engagement portion has an extension portion extending from the underwater side edge of the intermediate cover portion to its underside, and an opposing plate portion extending from the lower edge of the extension portion to the abovewater side along the corner valley and facing the intermediate cover portion at a distance, and is configured so that the underside of the intermediate cover portion, the upper surface of the opposing plate portion, and the extension portion can engage with the roof underwater side engagement portion of the pair of roof materials arranged on the same tier as the corner valley cover by embracing it from the outside, and it is preferable that the tip of the opposing plate portion is configured to engage with the inside of the recess of the roof abovewater side engagement portion of the pair of roof materials provided on the adjacent tier on the underwater side of the pair of roof materials arranged on the same tier.

[0015] The corner valley structure of the sixth invention is, in the fifth invention, preferably such that the opposing plate portion has a pair of oblique sides that engage with the inside of the recesses of the roof abovewater side engaging portions of a pair of roof materials located on adjacent steps on the belowwater side, a pair of side sides that are connected to the belowwater side ends of the pair of oblique sides and face each other in the perpendicular direction, and a base end side that connects the belowwater side ends of the pair of side sides and forms the lower edge of the extension portion, and the tip portion of the opposing plate portion is preferably configured to include the pair of oblique sides.

[0016] According to the fifth and sixth inventions, the tip of the opposing plate of the underwater embracing engagement part engages with the abovewater engagement part of the roof material located on the adjacent underwater step, which prevents the underwater end of the corner valley cover from being rolled up by wind, etc. This prevents the corner valley cover from flapping up and down or being blown away by wind, etc.

[0017] The corner valley structure of the seventh invention, in any one of the third to sixth inventions, preferably comprises a pair of fixing members for fixing the corner valley cover to the pair of sheathing boards together with the pair of roof materials located at the same level as the corner valley cover, and one of the pair of fixing members engages with the roof above-waterside engaging portion of the roof material located on one side and the cover above-waterside engaging portion formed on the first cover portion of the corner valley cover in a state where both engaging portions overlap, and is fixed to the portion of the sheathing board located on the one side of the corner valley above the roof material, and the other of the pair of fixing members engages with the roof above-waterside engaging portion of the roof material located on the other side and the cover above-waterside engaging portion formed on the second cover portion of the corner valley cover in a state where both engaging portions overlap, and is fixed to the portion of the sheathing board located on the other side of the corner valley above the roof material.

[0018] According to the seventh aspect of the present invention, by fixing the corner valley cover to each of a pair of sheathing boards with a pair of fixing members, it is possible to prevent the corner valley cover from swinging around the fixing point as a fulcrum when subjected to external forces such as wind. Furthermore, by engaging the roof abovewater side engaging portion of the roof material and the cover abovewater side engaging portion of the corner valley cover with the fixing members while both engaging portions overlap, it is possible to use a single fixing member to fix both the roof material and the corner valley cover. This reduces the number of parts required to fix the roof material and the corner valley cover, and simplifies the fixing structure.

[0019] The corner valley structure of the eighth invention, in any one of the third to seventh inventions, comprises a plurality of spatial arrangement members arranged in the space between the pair of sheathing boards and each of the plurality of pairs of roof materials, and it is preferable that each of the plurality of spatial arrangement members is arranged so that, when viewed from the vertical direction of the sheathing boards on which each spatial arrangement member is arranged, at least a portion of the spatial arrangement members overlaps with the corner valley cover provided on the step on which each spatial arrangement member is arranged.

[0020] According to the eighth aspect of the present invention, by disposing a spatial arrangement member in the space between a pair of sheathing boards and multiple pairs of roofing materials (a pair of roofing materials for each row of multiple pairs of roofing materials), even if the corner valley cover elastically deforms downward due to a load from above or the like and abuts against the roofing material, the deformation of the roofing material is restricted by the spatial arrangement member. Therefore, the corner valley cover can be restricted from deforming downward in the vertical direction. Note that factors that cause downward deformation of the corner valley cover are not limited to loads acting on the corner valley cover from above, but also include, for example, aging due to sunlight.

[0021] The corner valley structure of the 9th invention is preferably such that, in the 8th invention, the plurality of spatial arrangement members are arranged so that their respective lower surfaces abut the upper surfaces of the respective sheathing boards and their respective upper surfaces abut the lower surfaces of the roofing materials arranged at the same level as the respective spatial arrangement members.

[0022] According to the ninth aspect of the present invention, the spatial arrangement member is arranged in the space between the sheathing board and the roofing material above it without any gaps in the height direction (direction perpendicular to the sheathing board). Therefore, when the corner valley cover elastically deforms downward due to a load from its upper surface or the like and abuts against the roofing material, the spatial arrangement member can reliably restrict deformation of the roofing material. Therefore, deformation of the corner valley cover downward in the vertical direction can be reliably restricted.

[0023] The corner valley structure according to the tenth invention is the eighth or ninth invention, wherein the plurality of spatial arrangement members are preferably fixed to the upper surface of each of the sheathing boards with an adhesive.

[0024] According to the tenth aspect of the present invention, damage to the roofing material can be prevented when a load acting on the top surface of the corner valley cover causes the roofing material to deform and come into contact with the spatial arrangement member. Specifically, if axial fixing members such as bolts or nails are used to secure the spatial arrangement member, there is a risk that the roofing material may be damaged by contact with the axial fixing members when it deforms and comes into contact with the spatial arrangement member. This problem is particularly pronounced when the spatial arrangement member is made of an elastic material (e.g., sponge or cushion) that can deform in the vertical direction, because the spatial arrangement member compresses and deforms under the load from the roofing material, but the axial fixing members remain in their protruding position. In contrast, with this configuration, the spatial arrangement member is fixed to each sheathing board with adhesive, thereby avoiding the problem of roofing material damage caused by the axial fixing members.

[0025] The corner valley structure of the 11th invention is preferably such that, in any one of the 8th to 10th inventions, the multiple spatial arrangement members are each arranged so as to abut against the end face of the roof above-water side engagement portion of the roof material located on the adjacent tier below the water side of the tier on which each spatial arrangement member is arranged.

[0026] According to the eleventh aspect of the present invention, it is possible to easily determine the positioning of the spatial arrangement member in the roof slope direction when arranging the spatial arrangement member.

[0027] The corner valley structure of the 12th invention is preferably any one of the inventions of claims 8 to 11, in which the corner valley is covered by a valley gutter, and the multiple spatial arrangement members are fixed to the upper surfaces of each of the pair of sheathing boards, sandwiching the valley gutter between them.

[0028] According to the twelfth aspect of the present invention, the spatial arrangement member is disposed above the valley gutter, which particularly suppresses downward deformation of the portion of the corner valley cover located above the valley gutter, thereby suppressing blockage of the rainwater passage formed in the valley gutter by the corner valley cover.

[0029] The corner valley structure of the 13th invention is preferably any one of the inventions 3 to 12, wherein the cover main body has an above-water edge, an below-water edge, and a pair of side edges that connect both ends of the above-water edge and the below-water edge and face each other across the corner valley, and the pair of side edges are formed so as to extend in the vertical direction of the roof on each of the sheathing boards on which they are located.

[0030] According to the thirteenth aspect of the present invention, a pair of side edges of the corner valley cover, located on either side of the corner valley, extend in the vertical direction of the roof on each sheathing board, resulting in a generally diamond-shaped overall corner valley cover, providing an aesthetically pleasing corner valley structure. Furthermore, when the pair of side edges of the corner valley cover are formed to extend in the vertical direction of the roof, the overall corner valley cover becomes larger (in other words, the area of the top surface of the corner valley cover increases) compared to, for example, when these side edges are formed parallel to the extension direction of the corner valley. Larger corner valley covers reduce the number of corner valley covers installed, thereby reducing material costs and installation labor per unit area compared to, for example, when corner valley covers are formed small for increased strength. This leads to cost reductions in terms of labor hours and material costs. However, larger corner valley covers also increase the frequency with which they are used as scaffolding during roofing installation, and the amount of snow that accumulates on the top surface of the corner valley covers due to snowfall increases. Therefore, the above-described arrangement of the spatial arrangement members for improving the deformation resistance of the corner valley cover against loads and the like applied from its upper surface side is particularly useful.

[0031] The corner valley structure of the 14th invention is the 13th invention, and preferably has a water-stopping material attached to the areas adjacent to each of the pair of side edges on the underside of the corner valley cover.

[0032] According to the fourteenth aspect of the present invention, rainwater flowing into the cover from below each of the pair of side edges of the corner valley cover can be stopped by the water-stopping material arranged along each of the side edges. Furthermore, because each side edge extends in the vertical direction of the roof, the water-stopping position of the water-stopping material can be positioned farther away from the corner valley than when each side edge extends parallel to the corner valley. This prevents rainwater from reaching the corner valley (the boundary between a pair of sheathing boards) and infiltrating into the building.

[0033] The corner valley structure of the 15th invention is preferably the 13th invention, in which a water-stopping material is attached to the above-water end of the part of the underside of the cover main body that corresponds to the corner valley.

[0034] According to the fifteenth aspect of the present invention, the water-stopping material can stop rainwater flowing toward the valley along the water-side engaging portion of the valley cover, thereby preventing the rainwater from reaching the valley (the boundary between a pair of sheathing boards) and infiltrating into the building.

[0035] The corner valley structure of the 16th invention is preferably the 13th invention, in which water-stopping material is attached to both ends of the corner valley on the upper surface of the above-water side engagement portion of the corner valley cover and to the locations corresponding to the corner valley.

[0036] According to the sixteenth aspect of the present invention, rainwater flowing into the valley along the above-water engaging portion of the valley cover is stopped by the water-stopping material provided at both ends of the valley, and rainwater that passes through the water-stopping material can be stopped by the water-stopping material provided at the position of the above-water engaging portion of the valley cover that corresponds to the valley. This prevents rainwater from reaching the valley (the boundary between a pair of sheathing boards) and infiltrating into the building. [Effects of the Invention]

[0037] According to the present invention, a corner valley cover and a corner valley structure that are excellent in weatherproofing are provided. [Brief explanation of the drawings]

[0038] [Figure 1] 1 is an external perspective view showing a roof equipped with a corner valley structure according to an embodiment of the present invention; [Figure 2] 2 is an enlarged view showing a corner valley cover located at the top in FIG. 1. FIG. [Figure 3A] FIG. 3 is a cross-sectional view taken along line IIIA-IIIA in FIG. [Figure 3B] 3B is an enlarged view showing a section IIIB-IIIB in FIG. 3A. FIG. [Figure 4] FIG. 2 is a longitudinal cross-sectional view showing the roof material along the longitudinal direction of the roof. [Figure 5] FIG. 2 is a perspective view showing the corner valley cover as viewed from the top side (surface side). [Figure 6] FIG. 2 is a perspective view showing the corner valley cover as viewed from the bottom side (rear side). [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 5. [Figure 9] FIG. 10 is a schematic diagram showing an assembled state of the corner valley cover. [Figure 10] FIG. 2 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 1 is an explanatory diagram for explaining a construction method for a roof including a corner valley structure according to an embodiment of the present invention. [Figure 12] FIG. 1 is an explanatory diagram for explaining a construction method for a roof including a corner valley structure according to an embodiment of the present invention. [Figure 13] FIG. 1 is an explanatory diagram for explaining a construction method for a roof including a corner valley structure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0040] [Overall configuration] Fig. 1 is an external perspective view showing a roof 1 equipped with a corner valley structure 100 including a corner valley cover 20 according to an embodiment of the present invention, and Fig. 2 is an enlarged perspective view showing the location of the topmost corner valley cover 20 in Fig. 1. The corner valley structure 100 includes multiple pairs of roofing materials 11, each of which extends laterally across the roof and is arranged in multiple rows in the vertical direction of the roof on a pair of sheathing boards 4, 5 located on either side of a corner valley 6; multiple corner valley covers 20 installed on each row of the multiple pairs of roofing materials 11 to cover the upper side of the corner valley 6; and multiple spatial arrangement members 30 arranged in the space behind each corner valley cover 20.

[0041] The roof 1 includes two sloped roof sections 2, 3 arranged adjacent to each other with a valley 6 in between. The two sloped roof sections 2, 3 are arranged so that their respective slope directions A1, A2 intersect at 90° to each other in a plan view. The slope directions A1, A2 of each sloped roof section 2, 3 correspond to the roof longitudinal direction of each sloped roof section 2, 3, and the direction perpendicular to the roof longitudinal direction corresponds to the roof lateral direction.

[0042] The pair of sheathing boards 4, 5 respectively constitute the roof underlayment material of each of the sloped roof portions 2, 3. The pair of sheathing boards 4, 5 are each supported from below by a plurality of rafters (not shown) that form the framework of the roof 1.

[0043] A valley gutter 15 is disposed at the boundary between the pair of sheathing boards 4, 5 to cover the corner valley 6. The valley gutter 15 is a sheet metal member extending along the corner valley 6 and fixed to the upper surface of the pair of sheathing boards 4, 5, spanning the corner valley 6. The upper surface of the valley gutter 15 is formed with one central groove 15a and four side grooves 15b. The central groove 15a extends along the direction of the corner valley 6 at the center of the width of the valley gutter 15. The central groove 15a is formed so that its cross section perpendicular to its extension direction is V-shaped and open upward. The four side grooves 15b consist of two side grooves 15b located on one side of the central groove 15a and two side grooves 15b located on the other side. Each side groove 15b is formed so that its cross section perpendicular to its extension direction is a flat trapezoidal shape that opens upward.

[0044] Each pair of roofing materials 11 in each tier includes a plurality of one-side roofing materials 111 arranged on the upper surface of one of the sheathing boards 4 and a plurality of other-side roofing materials 112 arranged on the upper surface of the other sheathing board 5. The one-side roofing materials 111 and the other-side roofing materials 112 each extend in the horizontal direction of the roof on each of the sheathing boards 4, 5 and are arranged adjacent to each other in the vertical direction of the roof over multiple tiers. In the following description, when there is no need to particularly distinguish between the one-side roofing materials 111 and the other-side roofing materials 112, they will simply be referred to as roofing materials 11.

[0045] Each of the roof materials 11 is positioned so that one end in the roof lateral direction is located near the corner valley 6 and the other end is located outside the corner valley cover 20 in the roof lateral direction. The portion of each roof material 11 positioned below the corner valley cover 20 functions as a reinforcing member that restricts deformation of each corner valley cover 20 toward its lower surface in the vertical direction.

[0046] 3A is a cross-sectional view taken along line IIIA-IIIA in FIG. 1, FIG. 3B is an enlarged view of part IIIB in FIG. 3A, and FIG. 4 is a vertical cross-sectional view of roof material 11 taken along the vertical direction of the roof.

[0047] As shown in Figures 3A, 3B and 4, the roof material 11 has a roof material main body 11a which has a predetermined width in the vertical direction of the roof and extends long in the horizontal direction of the roof (perpendicular to the plane of the paper in each figure), an above-water side engaging portion 11b (equivalent to the roof above-water side engaging portion) formed along the entire above-water side edge of the roof material main body 11a, and an below-water side engaging portion 11c (equivalent to the roof below-water side engaging portion) formed along the entire below-water side edge of the roof material main body 11a.

[0048] The above-water side engaging portion 11b of the roofing material 11 is formed by bending the end of the roofing material 11 upward into a substantially U-shape so as to form a recess 11d that opens to the below-water side on the upper surface side of the roofing material main body 11a. That is, in this example, the above-water side engaging portion 11b is formed by a substantially U-shaped bent piece having the recess 11d.

[0049] The underwater engaging portion 11c of the roofing material 11 is formed by bending the end of the roofing material 11 downward into a substantially U-shape so as to form a recess 11e that opens above the water on the underside of the roofing material body 11a. That is, in this example, the underwater engaging portion 11c is formed by a substantially U-shaped bent piece having the recess 11e.

[0050] The roof materials 11 are connected to each other in the roof vertical direction by the recesses 11e of the belowwater side engaging portions 11c of adjacent roof materials 11 meshing (engaging) with the recesses 11d of the abovewater side engaging portions 11b.

[0051] In this example, the recesses 11d, 11e of the belowwater engaging portion 11c and the abovewater engaging portion 11b are used not only to connect adjacent roof materials 11 to each other, as shown in Figures 3A and 3B, but also to fix the corner valley cover 20 together with the roof material 11 to each sheathing board 4, 5 using the fixing member 40 described later.

[0052] [Overall structure of Sumiya cover] Next, the corner valley cover 20 will be described in detail with reference to Fig. 1 and Figs. 5 to 9. Fig. 5 is a perspective view of the corner valley cover 20 as seen from the top side (front side). Fig. 6 is a perspective view of the corner valley cover 20 as seen from the bottom side (rear side). Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 5. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 5. Fig. 9 is a schematic view showing the assembled state of the corner valley cover 20.

[0053] As shown in Figure 1, the corner valley cover 20 is arranged across a pair of roofing materials 11 (one-side roofing material 111 and the other-side roofing material 112) located on both sides of the corner valley 6 in each row of multiple pairs of roofing materials 11. More specifically, the multiple corner valley covers 20 are arranged so as to cover from above the end boundaries (boundary portions) of the pair of roofing materials 11 located on both sides of the corner valley 6 in the row in which each corner valley cover 20 is located. Each corner valley cover 20 is fixed to each sheathing board 4, 5 together with the pair of roofing materials 11 located on the same row as each corner valley cover 20 by fixing members 40 described below.

[0054] As shown in Figures 5 to 8, the corner valley cover 20 has a cover main body portion 21, an above-water side engagement portion 22 (equivalent to the cover above-water side engagement portion) provided along the above-water side edge of the cover main body portion 21, and an below-water side embracing engagement portion 23 provided on the below-water side edge of the cover main body portion 21.

[0055] [Sumitani cover body] The cover main body 21 has a first cover plate portion 211 facing the upper surface of the one side roof material 111, a second cover plate portion 212 facing the upper surface of the other side roof material 112, and an intermediate cover plate portion 213 that connects the edge portions on the corner valley side of the first cover plate portion 211 and the second cover plate portion 212 and is arranged so as to straddle the upper side of the corner valley 6.

[0056] 5 and 6, the intermediate cover plate portion 213 is made of a plate-like portion extending along the extension direction of the corner valley 6. The intermediate cover plate portion 213 has a width (plate width) in a corner valley-orthogonal direction (a direction orthogonal to the corner valley 6 and extending horizontally) that is orthogonal to the extension direction of the corner valley 6.

[0057] The above-water edge of the middle cover plate portion 213 is formed in the shape of a right triangle that is convex above the water, corresponding to the shape of the intersection between the above-water edge of the one roof member 111 and the above-water edge of the other roof member 112. The below-water edge of the middle cover plate portion 213 is formed in a straight line that extends in a direction perpendicular to the corner valley.

[0058] The first cover plate portion 211 and the second cover plate portion 212 are each formed in the shape of a triangular plate with three sides consisting of an above-water edge 21a extending along the roof lateral direction of the roof material 11, a side edge 21b extending in a direction perpendicular to the above-water edge 21a, and a connecting side edge 21c connected to the intermediate cover plate portion 213.

[0059] As shown in Fig. 7, the first cover plate 211, the second cover plate 212, and the intermediate cover plate 213 constituting the valley cover 20 are connected to form an inverted trapezoidal shape in a vertical cross section taken along the direction perpendicular to the valley. The upper surface 211a of the first cover plate 211, the upper surface 212a of the second cover plate 212, and the upper surface 213a of the intermediate cover plate 213 form a flat trapezoidal recess R that narrows toward the bottom. More specifically, the upper surface 213a of the intermediate cover plate 213 forms the bottom of the trapezoidal recess R, and the upper surfaces 211a of the first cover plate 211 and 212a of the second cover plate 212 form a pair of inclined side surfaces connected to the bottom of the trapezoidal recess R.

[0060] The upper surface of the intermediate cover plate portion 213 is formed so as to maintain the same height (so as not to change in height) in the direction perpendicular to the trough. That is, the upper surface of the intermediate cover plate portion 213 is not inclined in the direction perpendicular to the trough (i.e., the width direction of the recess), but is inclined so as to become lower toward the downstream side only in the extension direction of the trough 6.

[0061] The upper surface 211a of the first cover plate portion 211 and the upper surface 212a of the second cover plate portion 212 are inclined so as to become lower as they move from the outside to the inside in the width direction of the recess (direction perpendicular to the corner valley) (in other words, as they approach the side edge 21c of the intermediate cover plate portion 213).

[0062] 5 and 6, the abovewater edge of the cover main body 21 is an L-shaped edge consisting of the abovewater edge of the first cover plate 211, the abovewater edge of the intermediate cover plate 213, and the abovewater edge of the second cover plate 212, and is formed line-symmetrically with respect to the valley 6 in plan view. The belowwater edge of the cover main body 21 is a trapezoidal edge consisting of the belowwater edge of the first cover plate 211, the belowwater edge of the intermediate cover plate 213, and the belowwater edge of the second cover plate 212, and is formed line-symmetrically with respect to the valley 6 in plan view.

[0063] The pair of side edges 21b (which in this example coincide with the side edges of the entire corner valley cover 20) located on both sides of the corner valley 6 in the cover main body 21 extend in the roof longitudinal direction (i.e., in a direction parallel to the inclination directions A1, A2 of each sloped roof section 2, 3; see Figure 1) on the sheathing boards 4, 5 on which they are located. The pair of side edges 21b connect the respective ends of the above-water edge and the below-water edge of the cover main body 21, and are arranged to face each other across the corner valley.

[0064] [Above-water side engagement part of the corner cover] As shown in FIGS. 5 and 6, the above-water engaging portion 22 is formed in a substantially L-shape along the entire above-water edge of the cover main body 21.

[0065] 8, the abovewater engaging portion 22 is formed by bending the end of the corner valley cover 20 upward in a substantially U-shape so as to form recesses 22c that open to the belowwater side of each of the sloped roof portions 2, 3 on the upper surface side of the cover main body 21. That is, in this example, the abovewater engaging portion 22 is formed by a substantially U-shaped bent piece having the recesses 22c.

[0066] 3A and 3B, in the assembled state in which the corner valley cover 20 is assembled to the top of the roofing material 11, the abovewater-side engaging portion 22 engages so as to overlap with the inside of the recess 11d (hereinafter referred to as the inside of the recess) of the abovewater-side engaging portion 11b of the roofing material 11. Then, as shown enlarged in FIG. 3B, the underwater-side engaging portion 11c of the next roofing material 11 adjacent to the abovewater side engages from the outside (from the underwater side) with the abovewater-side engaging portion 22 of the corner valley cover 20 and the abovewater-side engaging portion 11b of the roofing material 11 in this engaged state, and the underwater-side embracing engaging portion 23 of the corner valley cover 20 located in the same layer as the roofing material 11 engages from the outside (from the underwater side) with the underwater-side engaging portion 11c of this next roofing material 11.

[0067] [Underwater side embrace engagement part of corner valley cover] 6, the underwater embracing engagement portion 23 is connected along the entire underwater edge of the cover main body 21 (more specifically, the intermediate cover plate portion 213). In this example, the underwater embracing engagement portion 23 is formed by bending a portion of the sheet metal member that serves as the base material of the corner valley cover 20, but this is not limited to this, and the underwater embracing engagement portion 23 may be formed, for example, by welding a member separate from the base material to the base material.

[0068] The underwater embrace engagement portion 23 has an opposing plate portion 23a and an extending portion 23b. The opposing plate portion 23a faces the undersurface of the intermediate cover plate portion 213 with a gap between them. The extending portion 23b extends from the underwater edge of the intermediate cover plate portion 213 toward its undersurface and is connected to the underwater edge of the opposing plate portion 23a. The opposing plate portion 23a is positioned to extend above the water from the lower edge of the extending portion 23b.

[0069] As shown in Figure 3B, the underwater-side embracing engagement portion 23 forms an engagement recess 23c between the upper surface of the opposing plate portion 23a and the lower surface of the intermediate cover plate portion 213 by the extension portion 23b. The engagement recess 23c is U-shaped and opens to the abovewater side. In the assembled state, the underwater-side embracing engagement portion 23 engages this engagement recess 23c from the outside (underwater side) with the underwater engagement portions 11c of the pair of roof materials 11 located at the same level. Thus, the underwater-side embracing engagement portion 23 is positioned so as to embrace the underwater engagement portions 11c of the pair of roof materials 11 from the outside (underwater side).

[0070] As shown in Figures 6 and 9, the opposing plate portion 23a has a pentagonal shape resembling a home plate. Specifically, the outer edge of the opposing plate portion 23a of the corner valley cover 20 has a base edge 23f, which is the lower edge of the extension portion 23b, a pair of side edges 23d extending above the water from both ends of the base edge 23f, and a pair of oblique edges 23e connected to the above-water ends of the pair of side edges 23d and sloping toward the center in the board width direction toward the above-water side. As shown in Figure 9, the pair of oblique edges 23e are formed to extend along the roof lateral direction of each of the pair of roof materials 11 provided on the adjacent below-water step.

[0071] As shown by the dotted lines in Figure 9, when assembled, a pair of oblique sides 23e (tip edges) of the opposing plate portion 23a engage with the inside of the recesses of the above-water side engagement portions 11b of a pair of roof materials 11 provided on the adjacent below-water side steps of the corner valley cover 20.

[0072] [Configuration of water-stopping material provided on corner valley cover] 5 and 6, a pair of first water-stopping materials 46 and one second water-stopping material 47 are attached to the corner valley cover 20. These first water-stopping materials 46 and second water-stopping materials 47 have the function of preventing rainwater and the like from entering the corner valley 6 when the corner valley cover 20 is assembled on the roof material 11. The first water-stopping materials 46 and second water-stopping materials 47 are fixed to the surface of the corner valley cover 20 via an adhesive or the like.

[0073] Specifically, each of the pair of first water-stopping materials 46 extends from the underside of the cover main body 21 of the corner valley cover 20 (see FIG. 6) to the upper surface of the abovewater-side engagement portion 22 (see FIG. 5). The first water-stopping material 46 has a lower-side water-stopping portion 46a (see FIG. 6) arranged along a pair of side edges 21b on the underside of the cover main body 21 of the corner valley cover 20, an upper-side water-stopping portion 46b (see FIG. 5) arranged on the upper surface of the abovewater-side engagement portion 22 of the corner valley cover 20, and a connecting portion 46c with a U-shaped cross section that connects the lower-side water-stopping portion 46a and the upper-side water-stopping portion 46b. The lower-side water-stopping portion 46a extends along the entire area adjacent to each side edge 21b on the underside of the cover main body 21. When the corner valley cover 20 is assembled, the lower surface-side water stopping portion 46a is sandwiched between the lower surface of the cover main body 21 and the upper surface of the roof material 11 and comes into close contact with these surfaces. When the corner valley cover 20 is assembled, the upper surface-side water stopping portion 46b is sandwiched between the inner surface of the above-water side engaging portion 11b of the roof material 11 and the upper surface of the above-water side engaging portion 22 of the corner valley cover 20 and comes into close contact with these surfaces.

[0074] The second water-stopping material 47 (see FIG. 5) is provided at the above-water end of the corner valley cover 20 at a location corresponding to the corner valley 6. In this example, the second water-stopping material 47 is provided from the underside of the above-water end of the intermediate cover plate portion 213 to the upper surface of the above-water engagement portion 22. Specifically, the second water-stopping material 47 has a lower-surface-side water-stopping portion 47a (see FIG. 6) that covers the above-water end of the location corresponding to the corner valley 6 on the underside of the intermediate cover plate portion 213, an upper-surface-side water-stopping portion 47b (see FIG. 5) that is substantially L-shaped in plan view and covers the center of the upper surface of the above-water engagement portion 22, and a connecting portion 47c that has a U-shaped cross section that connects these two water-stopping portions 47a, 47b. When the corner valley cover 20 is assembled, the lower surface water stopping portion 47a is sandwiched between the lower surface of the intermediate cover plate portion 213 and the upper surfaces of the pair of roof materials 11 on both sides of the corner valley 6, as shown in Fig. 3B, and is in close contact with each of these surfaces. When the corner valley cover 20 is assembled, the upper surface water stopping portion 47b is sandwiched between the inner surfaces of the above-water side engaging portions 11b of the pair of roof materials 11 on both sides of the corner valley 6 and the upper surfaces of the above-water side engaging portions 22 of the corner valley cover 20, as shown in Fig. 3B, and is in close contact with each of these surfaces.

[0075] [Configuration of fixing parts] Next, the pair of fixing members 40 will be described with reference to Figures 1, 2 and 10. Figure 10 is a cross-sectional view taken along line XX in Figure 1.

[0076] As shown in FIG. 1, each of the plurality of corner valley covers 20 is fixed to each of the sheathing boards 4 and 5 by a pair of fixing members 40 together with the pair of roof materials 111 and 112 located at the same level as each of the corner valley covers 20.

[0077] The pair of fixing members 40 are fixed by fasteners 49 to the upper surface of each sheathing board 4, 5 above the pair of roof materials 111, 112 at the same level as the corner valley cover 20 to be fixed thereto.

[0078] As shown in Figure 10, each fixing member 40 has a rectangular fixed plate portion 41 that is fixed to each sheathing board 4, 5, an engaging plate portion 42 that is located below the waterline further than the fixed plate portion 41 and at a predetermined height from the top surface of the sheathing boards 4, 5, an engaging piece 44 that is folded back in a U-shape from the tip of the engaging plate portion 42 to its underside and forms an engaging groove 43 that opens above the waterline between the engaging plate portion 42 and the engaging plate portion 42, and a connecting plate portion 45 that connects the above-water edge of the engaging plate portion 42 and the below-water edge of the fixed plate portion 41.

[0079] The engagement groove 43 of one of the fixing members 40 (the fixing member 40 located to the left of the corner valley 6 in FIG. 1) engages with the above-water side engagement portion 11b of the roof material 111 on one side and the above-water side engagement portion 22 of the corner valley cover 20 in a state where both engagement portions 11b, 22 are substantially overlapped vertically (see FIG. 10). Then, the one fixing member 40 is fixed to one of the sheathing boards 4 while maintaining this engaged state.

[0080] The engagement groove 43 of the other fixing member 40 (the fixing member 40 located to the right of the corner valley 6 in Fig. 1) engages with the above-water side engagement portion 11b of the other roof material 112 and the above-water side engagement portion 22 of the corner valley cover 20 in a state where both engagement portions 11b, 22 are approximately overlapping vertically (similar to one fixing member 40 shown in Fig. 10).The other fixing member 40 is then fixed to the other sheathing board 5 while maintaining this engaged state.

[0081] [Spatial arrangement components] Next, the spatial arrangement members 30 will be described in detail with reference to Figure 2. Each spatial arrangement member 30 is arranged on the back side (lower side) of each of the plurality of corner valley covers 20. When viewed from the vertical direction of the sheathing boards 4, 5, each spatial arrangement member 30 is arranged so as to overlap with a corner valley cover 20 provided on the same level. Each spatial arrangement member 30 functions as a reinforcing member that restricts deformation of each corner valley cover 20 toward its lower side in the vertical direction.

[0082] Specifically, two spatial arrangement members 30 are arranged for each corner valley cover 20. One spatial arrangement member 30 is arranged so as to be sandwiched between one sheathing board 4 and one-side roof material 111, and the other spatial arrangement member 30 is arranged so as to be sandwiched between the other sheathing board 5 and the other-side roof material 112.

[0083] In this example, each spatial arrangement member 30 is formed in the shape of a trapezoidal plate, and is made of, for example, semi-rigid or rigid urethane foam.

[0084] Specifically, as shown in Figures 2 and 3A, each spatial arrangement member 30 has a lower surface 30a (shown only in Figure 3A), an upper surface 30b, a corner valley side end face 30c located on the corner valley 6 side, an anti-corner valley side end face 30d located on the opposite side from the corner valley 6 side, an above-water side end face 30e, and an below-water side end face 30f.

[0085] Each spatial arrangement member 30 is arranged so that its lower surface 30a abuts against the upper surface of each sheathing board 4, 5, and its upper surface 30b abuts against the lower surface of the roof material 11 arranged on the same level as each spatial arrangement member 30. In this example, the lower surface 30a of each spatial arrangement member 30 is fixed to the upper surface of each sheathing board 4, 5, with the valley gutter 15 sandwiched between them.

[0086] As shown in Figure 2, both the above-water end face 30e and the below-water end face 30f are formed to extend in the horizontal direction of the roof on each sheathing board 4, 5 on which each spatial arrangement member 30 is arranged. The below-water end face 30f is arranged so as to abut against or with a small gap between it and the above-water end of the roof material 11 arranged on the adjacent below-water stage. The distance in the vertical direction of the roof between the above-water end face 30e and the below-water end face 30f is set to, for example, about 50% to 60% of the dimension of the roof material 11 in the vertical direction of the roof.

[0087] The valley-side end face 30c is formed to extend parallel to the extension direction (the vertical direction in FIG. 2) of the valley 6. The valley-side end face 30c is disposed at the same position as the valley 6 or at a position slightly spaced apart from the valley 6 in a plan view.

[0088] The anti-corner valley side end face 30d is formed to extend in the vertical direction of the roof on each sheathing board 4, 5. The anti-corner valley side end face 30d is located outward in the horizontal direction of the roof than the side edge 21b of the corner valley cover 20.

[0089] [Assembly procedure] Figures 11 to 13 are explanatory diagrams illustrating a method for constructing a roof 1 including the above-mentioned corner valley structure 100. When constructing the roof 1, a valley gutter 15 is installed to cover the boundary between the sheathing boards 4 on one side and the sheathing boards 5 on the other side (i.e., the corner valley 6). After the installation of the valley gutter 15 is complete, the roofing materials 11 and corner valley covers 20 are placed in order, one layer at a time, from the belowwater side to the abovewater side. For ease of understanding, the components to be constructed are indicated by thick, two-dot chain lines in Figures 12 and 13. While Figure 11 illustrates the valley gutter 15, it has been omitted from Figures 12 and 13 for clarity.

[0090] 11, a pair of spatial arrangement members 30 are first placed on the upper surface of each sheathing board 4, 5 in a portion adjacent to the uppermost installed roofing material 11. Specifically, the pair of spatial arrangement members 30 are placed on the upper surface of each sheathing board 4, 5 in a portion adjacent to the corner valley 6 with the valley gutter 15 in between, and fixed with an adhesive.

[0091] After this fixing is completed, as shown by the two-dot chain lines in Figure 12, the next pair of roofing materials 11 are placed so as to cover the upper sides of the pair of spatial arrangement members 30, and the pair of roofing materials 11 are fixed to each of the sheathing boards 4, 5 using the pair of fixing members 40. In the work of placing the pair of roofing materials 11, the belowwater side engaging portion 11c of each roofing material 11 is engaged with the abovewater side engaging portion 11b of the roofing material 11 that has already been installed from the belowwater side (see arrow K1 in Figure 12). In addition, when fixing a pair of roof materials 11 using a pair of fixing members 40, the engaging pieces 44 (see Figure 3B) of each fixing member 40 are engaged with the above-water side engaging portions 11b of the pair of roof materials 11 from the below-water side (see arrow K2 in Figure 12), so that each fixing member 40 supports the pair of roof materials 11 by suspending them against the roof slope, and then each fixing member 40 is fixed to each sheathing board 4, 5 using fasteners 49.

[0092] After the installation of the next pair of roofing materials 11 is completed, as shown in Figure 13, the corner valley cover 20 is placed to cover the boundary between the pair of roofing materials 11, and the corner valley cover 20 is fixed to each of the sheathing boards 4, 5 together with the pair of roofing materials 11 using a pair of fixing members 40. When placing the corner valley cover 20, the underwater-side embracing engagement portion 23 of the corner valley cover 20 is engaged with the underwater-side engagement portion 11c (see Figures 3A and 3B) of the pair of roofing materials 11 on the same layer as the corner valley cover 20 so as to overlap from the outside of the recess (from the direction of arrow K3 in Figure 13), and the abovewater-side engagement portion 22 of the corner valley cover 20 is engaged with the abovewater-side engagement portion 11b of the pair of roofing materials 11 on the same layer so as to overlap from the inside of the recess (from the direction of arrow K4 in Figure 13). After the placement of the corner valley covers 20 is completed, the engaging pieces 44 of the pair of fixing members 40 are engaged with the above-water side engaging portions 11b of the roof material 11 and the above-water side engaging portions 22 of the corner valley covers 20 in a state where these engaging portions 11b, 22 overlap (see Figures 3A and 3B). After this engagement work is completed, each fixing member 40 is fixed to each sheathing board 4, 5 with a fastener 49. Thereafter, the series of operations shown in Figures 11 to 13 described above are repeated.

[0093] (Action and effect) As described above, the corner valley cover 20 of this embodiment comprises a first cover plate portion 211 facing the upper surface of one roof material 111, a second cover plate portion 212 facing the upper surface of the other roof material 112, and an intermediate cover plate portion 213 that connects the edge portions of the first cover plate portion 211 and the second cover plate portion 212 on the corner valley 6 side and is arranged so as to straddle the upper side of the corner valley 6. The upper surface of the intermediate cover plate portion 213 is a flat surface that extends along the corner valley 6 and has a width in a direction perpendicular to the corner valley 6, which is horizontally perpendicular to the extension direction of the corner valley 6 (see FIG. 1, etc.).

[0094] According to this configuration, the upper surface of the intermediate cover plate portion 213 of the corner valley cover 20 is formed as a flat surface having a width in the corner valley-orthogonal direction that is horizontally orthogonal to the extension direction of the corner valley 6, so that rainwater can be dispersed evenly in the width direction (the corner valley-orthogonal direction) on the upper surface of the intermediate cover plate portion 213. Therefore, overflow of rainwater on the upper surface of the corner valley cover 20 and an excessive increase in the flow rate of rainwater can be suppressed, thereby improving rainproofing.

[0095] In this embodiment, the edge of the intermediate cover plate portion 213 on the underwater side extends linearly in a direction perpendicular to the valley.

[0096] This configuration allows the flow rate of rainwater flowing downstream from the underwater edge of the intermediate cover plate 213 to be uniform across its entire width. That is, with this configuration, the underwater edge of the intermediate cover plate 213 extends linearly across the width of the intermediate cover plate 213 (the direction perpendicular to the valleys), allowing the flow rate of rainwater flowing from the underwater edge of the intermediate cover plate 213 to be uniform across its entire width. This prevents unevenness in the flow rate of rainwater on the upper surface of the intermediate cover plate 213, allowing the rainwater to be uniformly dispersed across the width of the intermediate cover plate 213, thereby improving waterproofing. Furthermore, by forming the underwater edge of the intermediate cover plate 213 in a linear shape, the underwater embracing engagement portion 23 connected to the underwater edge can be easily formed by bending a metal sheet. In other words, if the underwater edge of the intermediate cover plate portion 213 is formed, for example, in an arc shape, it is not easy to bend the sheet metal member, and there is a risk of a weak part occurring at the bending point, but this embodiment can avoid such problems.

[0097] In the corner valley structure 100, each of the multiple roof materials 11 has an underwater engaging portion 11c located at the underwater edge of each roof material 11 and having a recess 11e that opens to the abovewater side on the underside of each roof material 11, and an abovewater engaging portion 11b located at the abovewater edge of each roof material 11 and having a recess 11d that opens to the belowwater side on the upper side of each roof material 11, and is configured to be connectable in the vertical direction of the roof by the underwater engaging portions 11c and abovewater engaging portions 11b of roof materials 11 that are adjacent in the vertical direction of the roof engaging with each other by the interlocking of their respective recesses 11e, 11d. The corner valley cover 20 has a cover main body 21 including the first cover plate portion 211, the second cover plate portion 212 and the intermediate cover plate portion 213, and an above-water side engaging portion 22 connected to the above-water side edge portion of the cover main body 21 and engaging with the above-water side engaging portions 11b of the pair of roof materials 11 arranged on the same tier as the corner valley cover 20 so as to overlap from the inside of their recesses, and the above-water side engaging portions 11b of the pair of roof materials 11 and the above-water side engaging portions 22 of the corner valley cover 20 overlapping with the inside of their recesses are configured to engage with the inside of the recesses of the below-water side engaging portions 11c of a pair of roof materials 11 arranged on the adjacent tier above the water side of the tier on which the pair of roof materials 11 are located.

[0098] According to this configuration, the above-water side engagement portion 11b of the roof material 11 and the above-water side engagement portion 22 of the corner valley cover 20 that engages with the inside of its recess are engaged with the inside of the recess of the below-water side engagement portion 11c of the roof material 11 located on the adjacent tier on the above-water side of the tier on which the corner valley cover 20 is located, thereby simplifying the engagement structure for attaching the corner valley cover 20 to the roof material 11 and reducing the number of parts.

[0099] The corner valley cover 20 has an underwater side embracing engagement portion 23. The underwater side embracing engagement portion 23 is connected to the underwater side edge portion of the intermediate cover plate portion 213 of the cover main body portion 21, and engages with the underwater side engagement portion 11c of the pair of roof materials 11 arranged on the same level as the corner valley cover 20 so as to embrace it from the outside (see Figures 3A and 3B, etc.).

[0100] According to this configuration, the underwater side embracing engagement portion 23 connected to the underwater side edge portion of the intermediate cover plate portion 213 is engaged from the outside with the underwater side engagement portions 11c of the pair of roof materials 11, thereby firmly connecting the underwater side end portion of the corner valley cover 20 to the pair of roof materials 11. Furthermore, when assembling the corner valley cover 20, the underwater side embracing engagement portion 23 is engaged with the underwater side engagement portions 11c of the pair of roof materials 11, thereby positioning the corner valley cover 20, thereby suppressing positional variation of the corner valley cover 20 and improving the external design.

[0101] In this embodiment, the underwater-side embracing engagement portion 23 has an extension portion 23b extending from the underwater edge of the intermediate cover plate portion 213 to its underside, and an opposing plate portion 23a extending from the lower edge of the extension portion 23b to the abovewater side along the corner valley 6 and facing the intermediate cover plate portion 213 at a distance, and is configured so that the underside of the intermediate cover plate portion 213, the upper surface of the opposing plate portion 23a, and the extension portion 23b can engage with the underwater-side engagement portions 11c of the pair of roofing materials 11 arranged on the same tier as the corner valley cover 20 so as to embrace them from the outside. The tip of the opposing plate portion 23a is configured to engage with the inside of the recess of the abovewater-side engagement portion 11b of the pair of roofing materials 11 provided on the adjacent tier on the belowwater side of the pair of roofing materials 11 located on the same tier.

[0102] Specifically, the opposing plate portion 23a has a pair of oblique sides 23e that engage with the above-water engaging portions 11b of a pair of roof materials 11 arranged on the adjacent below-water stage, a pair of side sides 23d that are connected to the below-water ends of the pair of oblique sides 23e and face each other in the direction perpendicular to the valley, and a base end side 23f that connects the below-water ends of the pair of side sides 23d and forms the lower edge of the extension portion 23b, and the tip portion of the opposing plate portion 23a is configured to include the pair of oblique sides 23e (see Figure 9, etc.).

[0103] With this configuration, the tip of the opposing plate portion 23a of the underwater embracing engagement portion 23 engages with the abovewater engagement portion 11b of the roof material 11 of the adjacent underwater stage, preventing the underwater end of the corner valley cover 20 from being rolled up by wind, etc. Therefore, the corner valley cover 20 can be prevented from flapping up and down or being blown away by wind, etc.

[0104] In this embodiment, the corner valley structure 100 includes a pair of fixing members 40 for fixing the corner valley cover 20 to the pair of sheathing boards 4, 5 together with the pair of roofing materials 11 located at the same level as the corner valley cover 20. One of the pair of fixing members 40 engages with the above-water engaging portion 11b of the one-side roofing material 111 and the above-water engaging portion 22 formed on the first cover board portion 211 of the corner valley cover 20 in a state where both engaging portions overlap (see Figures 3A and 3B), and is fixed to the portion of the sheathing board 4 located on the one side of the corner valley 6, above the roofing material 11 (see Figures 1 and 10). The other fixing member of the pair of fixing members 40 engages with the above-water side engaging portion 11b of the other side roof material 112 and the above-water side engaging portion 22 of the second cover plate portion 212 of the corner valley cover 20 in a state where both engaging portions overlap, and is fixed to the portion of the sheathing board 5 located on the other side of the corner valley 6 above the roof material 11.

[0105] According to this configuration, the corner valley cover 20 is fixed to each of the pair of sheathing boards 4, 5 using a pair of fixing members 40, thereby preventing the corner valley cover 20 from swinging around the fixing points as a fulcrum when subjected to external forces such as wind. Furthermore, the above-water-side engaging portion 11b of the roofing material 11 and the above-water-side engaging portion 22 of the corner valley cover 20 are engaged with the fixing member 40 with the two engaging portions overlapping, allowing a single fixing member 40 to be used for both fixing the roofing material 11 and the corner valley cover 20. This reduces the number of parts required to fix the roofing material 11 and the corner valley cover 20 and simplifies the fixing structure. Furthermore, each fixing member 40 can support the above-water-side engaging portion 11b of the roofing material 11 and the above-water-side engaging portion 22 of the corner valley cover 20 with the two engaging portions overlapping, so that they hang against the roof slope. This allows the installation position of each fixing member 40 to be easily changed to avoid interference with surrounding components.

[0106] The corner valley structure 100 includes a plurality of spatial arrangement members 30 arranged in the spaces between a pair of sheathing boards 4, 5 and each of the plurality of roof materials 11. When viewed from the vertical direction of the sheathing boards 4, 5 on which each spatial arrangement member 30 is arranged, each of the plurality of spatial arrangement members 30 is arranged so that at least a portion of each of the spatial arrangement members 30 overlaps with a corner valley cover 20 provided on the same level as each spatial arrangement member 30 (see FIG. 2, etc.).

[0107] According to this configuration, by disposing the spatial arrangement member 30 in the space between the pair of sheathing boards 4, 5 and the roof material 11 above them, even if the corner valley cover 20 elastically deforms downward due to a load from above and comes into contact with the roof material 11, the deformation of the roof material 11 is restricted by the spatial arrangement member 30. Therefore, the deformation of the corner valley cover 20 downward in the vertical direction can be restricted.

[0108] In addition, the multiple spatial arrangement members 30 are arranged so that their respective lower surfaces 30a abut the upper surfaces of the respective sheathing boards 4, 5, and their respective upper surfaces 30b abut the lower surfaces of the roofing materials 11 arranged on the same level as each spatial arrangement member 30 (see Figure 3A, etc.).

[0109] With this configuration, the spatial arrangement member 30 can be placed without any gaps in the height direction (direction perpendicular to each of the sheathing boards 4, 5) in the space between the sheathing boards 4, 5 and the roof material 11 above them. Therefore, when the corner valley cover 20 elastically deforms downward due to a load from its upper surface and abuts against the roof material 11, the deformation of the roof material 11 can be reliably restricted by the spatial arrangement member 30. Therefore, the deformation of the corner valley cover 20 downward in the vertical direction can be restricted.

[0110] The plurality of spatial arrangement members 30 are fixed to the upper surfaces of the sheathing boards 4 and 5 with adhesive.

[0111] This configuration prevents damage to roofing material 11 when a load acting from above on corner valley cover 20 causes roofing material 11 to deform and come into contact with spatial arrangement member 30. Specifically, if axial fixing members such as bolts or nails were used to secure spatial arrangement member 30, there is a risk that roofing material 11 would be damaged by the axial fixing members when it deforms and comes into contact with spatial arrangement member 30. This problem is particularly pronounced when spatial arrangement member 30 is made of an elastic material (e.g., sponge or cushion) that can deform in the vertical direction, because although spatial arrangement member 30 is compressed and deformed by the load from roofing material 11, the axial fixing members remain in their protruding positions. In contrast, this configuration uses adhesive to secure spatial arrangement member 30 to each sheathing board 4, 5, thereby avoiding the problem of roofing material 11 being damaged by the axial fixing members.

[0112] Each of the plurality of spatial arrangement members 30 is arranged so as to abut against the end face of the above-water engaging portion 11b of the roof material 11 located in the tier below the water level of the tier on which each spatial arrangement member 30 is arranged.

[0113] According to this configuration, when disposing the spatial arrangement member 30, it is possible to easily position it in the roof slope direction.

[0114] The corner valley 6 is covered by a valley gutter 15, and the plurality of spatial arrangement members 30 are fixed to the upper surfaces of the sheathing boards 4 and 5 with the valley gutter 15 sandwiched between them.

[0115] With this configuration, the spatial arrangement member 30 is disposed above the valley gutter 15, which particularly suppresses downward deformation of the portion of the corner valley cover 20 located above the valley gutter 15. Therefore, it is possible to suppress the rainwater passage formed in the valley gutter 15 from being blocked by deformation of the corner valley cover 20.

[0116] The cover main body 21 has an above-water edge, an below-water edge, and a pair of side edges 21b connecting both ends of the above-water edge and the below-water edge, and each side edge 21b is formed to extend in the vertical direction of the roof on each of the sheathing boards 4, 5 on which it is located.

[0117] According to this configuration, a pair of side edges 21b of the corner valley cover 20, located on both sides of the corner valley 6, extend in the vertical direction of the roof on each sheathing board 4, 5. This gives the entire corner valley cover 20 a generally diamond shape, resulting in an aesthetically pleasing corner valley structure 100. Furthermore, when the pair of side edges 21b of the corner valley cover 20 are formed to extend in the vertical direction of the roof, the entire corner valley cover 20 becomes larger (in other words, the area of the top surface of the corner valley cover 20 increases) compared to, for example, when these side edges 21b are formed parallel to the extension direction of the corner valley 6. When the corner valley cover 20 is enlarged, the number of corner valley covers 20 installed can be reduced, thereby reducing material costs and installation labor per unit area compared to, for example, when the corner valley cover 20 is formed small to improve strength. This leads to cost reductions in terms of labor hours and material costs. However, on the other hand, as the corner valley cover 20 becomes larger, the corner valley cover 20 is more frequently used as a foothold when installing the roofing material 11, and the amount of snow that accumulates on the top surface of the corner valley cover 20 due to snowfall increases. Therefore, the arrangement of the spatial arrangement member 30 described above, which improves the deformation resistance of the corner valley cover 20 against loads from its top surface, is particularly useful.

[0118] In this embodiment, a first water-stopping material 46 is attached to each of the areas adjacent to the side edges 21b on the lower surface of the corner valley cover 20.

[0119] With this configuration, rainwater that attempts to flow into the corner valley cover 20 from below each side edge 21b can be stopped by the first water-stopping material 46 arranged along each side edge 21b. Furthermore, because each side edge 21b extends in the vertical direction of the roof, the water-stopping position of the water-stopping material 46 can be placed farther away from the corner valley 6 than if each side edge 21b extended parallel to the corner valley 6. This prevents rainwater from reaching the corner valley 6 (the boundary between a pair of sheathing boards 4, 5) and infiltrating into the building.

[0120] In this embodiment, a lower surface side water stopping portion 47a of the second water stopping material 47 is attached to the water-side end portion of the lower surface of the cover main body portion 21 at a location corresponding to the corner valley 6.

[0121] With this configuration, rainwater flowing toward the corner valley 6 along the water-side engaging portion 22 of the corner valley cover 20 can be stopped by the underside water stopping portion 47a of the second water stopping material 47. Therefore, the rainwater can be prevented from entering the building through the corner valley 6 (the boundary position between the pair of sheathing boards 4, 5).

[0122] In addition, in this embodiment, an upper surface side water-stopping portion 46b of the first water-stopping material 46 is provided at both ends of the upper surface of the water-side engagement portion 22 of the corner valley cover 20 that sandwich the corner valley 6, and an upper surface side water-stopping portion 47b of the second water-stopping material 47 is provided at the location corresponding to the corner valley 6.

[0123] With this configuration, rainwater flowing toward the corner valley 6 along the above-water side engaging portion 22 of the corner valley cover 20 is stopped by the upper-side water stopping portions 46b of the first water stopping material 46 provided at both ends sandwiching the corner valley 6, and rainwater that slips through the upper-side water stopping portions 46b can be stopped by the upper-side water stopping portions 47b of the second water stopping material 47 provided at the location corresponding to the corner valley 6 of the above-water side engaging portion 22. This makes it possible to prevent rainwater from seeping into the building through the corner valley 6 (the boundary position between the pair of sheathing boards 4, 5).

[0124] The above-described specific embodiments mainly include inventions having the following configurations.

[0125] The corner valley cover of the first invention can be installed on each tier of multiple pairs of roofing materials, each of which extends laterally across the roof and is arranged in multiple tiers in the vertical direction of the roof on a pair of sheathing boards located on both sides of a corner valley.The corner valley cover covers the end boundary on the corner valley side of the pair of roofing materials, and comprises a first cover portion facing the upper surface of the roofing material located on one side of the corner valley, a second cover portion facing the upper surface of the roofing material located on the other side of the corner valley, and an intermediate cover portion that connects the corner valley side end edges of the first cover portion and the second cover portion and is arranged to straddle the upper side of the corner valley, and the upper surface of the intermediate cover portion consists of a flat surface having a width in the corner valley orthogonal direction, which is horizontally perpendicular to the extension direction of the corner valley.

[0126] In the corner valley cover according to the second invention, in the first invention, it is preferable that the underwater edge of the intermediate cover portion extends linearly in a direction perpendicular to the corner valley.

[0127] The corner valley structure according to the third invention is a corner valley structure comprising a plurality of corner valley covers each comprising the corner valley cover according to the first or second invention, and a plurality of pairs of roofing materials, wherein each of the roofing materials has a roof underwater engaging portion located at the underwater edge of each of the roofing materials and having a recess that opens to the abovewater side on the underside of each of the roofing materials, and a roof abovewater engaging portion located at the abovewater edge of each of the roofing materials and having a recess that opens to the belowwater side on the upper side of each of the roofing materials, and the roof underwater engaging portion and the roof abovewater engaging portion of adjacent roofing materials engage with each other by meshing the recesses, thereby enabling connection in the vertical direction of the roof. The corner valley cover has a cover main body portion including the first cover portion, the second cover portion, and the intermediate cover portion, and a cover above-water side engaging portion connected to the above-water side edge portion of the cover main body portion and engaging with the roof above-water side engaging portions of the pair of roof materials arranged on the same tier as the corner valley cover so as to overlap from the inside of the recess, and the roof above-water side engaging portions of the pair of roof materials and the cover above-water side engaging portions of the corner valley cover overlapping the inside of the recess are configured to engage with the inside of the recesses of the roof below-water side engaging portions of a pair of roof materials arranged on the adjacent tier above the water side of the tier on which the pair of roof materials are located.

[0128] The corner valley structure of the fourth invention is preferably the third invention, wherein the corner valley cover is connected to the underwater edge portion of the intermediate cover portion of the cover main body portion and further has an underwater embracing engagement portion that engages with the roof underwater engagement portions of the pair of roof materials arranged at the same level as the corner valley cover by embracing them from the outside.

[0129] The corner valley structure of the fifth invention is, in the fourth invention, such that the underwater side embracing engagement portion has an extension portion extending from the underwater side edge of the intermediate cover portion to its underside, and an opposing plate portion extending from the lower edge of the extension portion to the abovewater side along the corner valley and facing the intermediate cover portion at a distance, and is configured so that the underside of the intermediate cover portion, the upper surface of the opposing plate portion, and the extension portion can engage with the roof underwater side engagement portion of the pair of roof materials arranged on the same tier as the corner valley cover by embracing it from the outside, and it is preferable that the tip of the opposing plate portion is configured to engage with the inside of the recess of the roof abovewater side engagement portion of the pair of roof materials provided on the adjacent tier on the underwater side of the pair of roof materials arranged on the same tier.

[0130] The corner valley structure of the sixth invention is, in the fifth invention, preferably such that the opposing plate portion has a pair of oblique sides that engage with the inside of the recesses of the roof abovewater side engaging portions of a pair of roof materials located on adjacent steps on the belowwater side, a pair of side sides that are connected to the belowwater side ends of the pair of oblique sides and face each other in the perpendicular direction, and a base end side that connects the belowwater side ends of the pair of side sides and forms the lower edge of the extension portion, and the tip portion of the opposing plate portion is preferably configured to include the pair of oblique sides.

[0131] The corner valley structure of the seventh invention, in any one of the third to sixth inventions, preferably comprises a pair of fixing members for fixing the corner valley cover to the pair of sheathing boards together with the pair of roof materials located at the same level as the corner valley cover, and one of the pair of fixing members engages with the roof above-waterside engaging portion of the roof material located on one side and the cover above-waterside engaging portion formed on the first cover portion of the corner valley cover in a state where both engaging portions overlap, and is fixed to the portion of the sheathing board located on the one side of the corner valley above the roof material, and the other of the pair of fixing members engages with the roof above-waterside engaging portion of the roof material located on the other side and the cover above-waterside engaging portion formed on the second cover portion of the corner valley cover in a state where both engaging portions overlap, and is fixed to the portion of the sheathing board located on the other side of the corner valley above the roof material.

[0132] The corner valley structure of the eighth invention, in any one of the third to seventh inventions, comprises a plurality of spatial arrangement members arranged in the space between the pair of sheathing boards and each of the plurality of pairs of roof materials, and it is preferable that each of the plurality of spatial arrangement members is arranged so that, when viewed from the vertical direction of the sheathing boards on which each spatial arrangement member is arranged, at least a portion of the spatial arrangement members overlaps with the corner valley cover provided on the step on which each spatial arrangement member is arranged.

[0133] The corner valley structure of the 9th invention is preferably such that, in the 8th invention, the plurality of spatial arrangement members are arranged so that their respective lower surfaces abut the upper surfaces of the respective sheathing boards and their respective upper surfaces abut the lower surfaces of the roofing materials arranged at the same level as the respective spatial arrangement members.

[0134] The corner valley structure according to the tenth invention is the eighth or ninth invention, wherein it is preferable that each of the plurality of spatial arrangement members is fixed to the upper surface of each of the sheathing boards with an adhesive.

[0135] The corner valley structure of the 11th invention is preferably such that, in any one of the 8th to 10th inventions, the multiple spatial arrangement members are each arranged so as to abut against the end face of the roof above-water side engagement portion of the roof material located on the adjacent tier below the water side of the tier on which each spatial arrangement member is arranged.

[0136] The corner valley structure of the 12th invention is preferably any one of the inventions of claims 8 to 11, in which the corner valley is covered by a valley gutter, and the multiple spatial arrangement members are fixed to the upper surfaces of each of the pair of sheathing boards, sandwiching the valley gutter between them.

[0137] The corner valley structure of the 13th invention is preferably any one of the inventions 3 to 12, wherein the cover main body has an above-water edge, an below-water edge, and a pair of side edges that connect both ends of the above-water edge and the below-water edge and face each other across the corner valley, and the pair of side edges are formed so as to extend in the vertical direction of the roof on each of the sheathing boards on which they are located.

[0138] The corner valley structure of the 14th invention is the 13th invention, and preferably has a water-stopping material attached to the areas adjacent to each of the pair of side edges on the underside of the corner valley cover.

[0139] The corner valley structure of the 15th invention is preferably the 13th invention, in which a water-stopping material is attached to the above-water end of the part of the underside of the cover main body that corresponds to the corner valley.

[0140] The corner valley structure of the 16th invention is preferably the 13th invention, in which water-stopping material is attached to both ends of the corner valley on the upper surface of the above-water side engagement portion of the corner valley cover and to the locations corresponding to the corner valley.

[0141] (Other embodiments) Although the corner valley structure 100 according to the embodiment of the present invention has been described above, the present invention is not limited to this, and the following embodiment can be adopted, for example.

[0142] (1) In the above embodiment, the underwater edge of the intermediate cover plate portion 213 in the corner valley cover 20 is formed in a straight line extending perpendicular to the corner valley, but this is not limited to this. For example, the central portion may be formed in a curved edge or L-shape that is recessed above the water compared to both ends.

[0143] (2) In the above embodiment, the corner valley cover 20 has the underwater side embracing engagement portion 23, but this is not limited to this, and the corner valley cover 20 may not have the underwater side embracing engagement portion 23.

[0144] (3) In the above embodiment, the spatial arrangement member 30 is arranged so that, when viewed from the vertical direction of each sheathing board 4, 5, a portion of it overlaps with the corner valley cover 20 provided on the same level as the spatial arrangement member 30, but this is not limited to this, and the entire spatial arrangement member 30 may be arranged so as to overlap with the corner valley cover 20.

[0145] (4) Furthermore, in the above embodiment, water-stopping materials (top surface side water-stopping portion 46b of the first water-stopping material 46 and top surface side water-stopping portion 47b of the second water-stopping material 47) are arranged at both ends of the corner valley 6 on the upper surface of the water-side engagement portion 22 of the corner valley cover 20 and at the location corresponding to the corner valley 6, but this is not limited to this, and water-stopping materials may be arranged at only one of the locations.

[0146] (5) Furthermore, in the above embodiment, the lower surface side water-stopping portion 46a and the upper surface side water-stopping portion 46b are integrally formed by the first water-stopping material 46, but this is not limited to this, and the lower surface side water-stopping portion 46a and the upper surface side water-stopping portion 46b may be formed as separate bodies.

[0147] (6) In the above embodiment, the first cover plate 211, the second cover plate 212, and the intermediate cover plate 213 are described as examples of the first cover portion, the second cover portion, and the intermediate cover portion, respectively, but the present invention is not limited to this. In other words, the first cover portion, the second cover portion, and the intermediate cover portion are not limited to being plate-shaped, and may have any shape.

[0148] (7) In the above embodiment, the reinforcing member (spatial arrangement member 30 in the above embodiment) is configured to suppress deformation due to a load acting from the upper surface side of the corner valley cover 20, but this is not limited thereto, and the reinforcing member may also suppress deformation due to deterioration of the corner valley cover 20 over time or deformation due to sunlight, etc. Restricting such deformation improves the appearance of the corner valley cover 20. [Explanation of symbols]

[0149] 4: Field board 5: Field board 6: Sumitani 11: Roofing materials 11b: Above-water engagement part (roof above-water engagement part) 11c: Lower water side engagement part (roof water lower side engagement part) 11d: recess 11e: recess 15:Tanihi 20: Sumiya Cover 21: Cover body 21b: A pair of side edges 22: Above-water engagement part (above-water engagement part of cover) 23: Underwater side embracing engagement part 23b: Extension part 23c: Opposing plate part 23d: side 23e: hypotenuse 23f: Proximal edge 30: Spatial arrangement component 40: Fixing member 46: First waterproof material 46b: Top side water stop part 47: Second waterproofing material 47a: Bottom side water stop part 47b: Top side water stop part 100: Sumiya structure 211: First cover plate part (first cover part) 212: Second cover plate part (second cover part) 213: Intermediate cover plate part (intermediate cover part)

Claims

1. The corner valley cover is designed to be installed on each of a plurality of pairs of roofing materials, each of which extends laterally across the roof on a pair of sheathing boards located on both sides of a corner valley, and which is arranged in a plurality of rows in the vertical direction of the roof. The corner valley cover covers the end boundary of the pair of roofing materials on the corner valley side. a first cover portion facing an upper surface of one of the pair of roofing materials arranged on one side of the corner valley; a second cover portion facing the upper surface of the roof material arranged on the other side of the corner valley of the pair of roof materials; an intermediate cover portion that connects edge portions of the first cover portion and the second cover portion on the corner valley side and is arranged to straddle an upper side of the corner valley, A corner valley cover, wherein the upper surface of the intermediate cover portion is a flat surface having a width in a corner valley orthogonal direction horizontally perpendicular to the extension direction of the corner valley.

2. The corner valley cover according to claim 1, A corner valley cover, wherein the underwater edge of the intermediate cover portion extends linearly in a direction perpendicular to the corner valley.

3. A corner valley structure including a plurality of corner valley covers each comprising the corner valley cover according to claim 1 or 2 and a plurality of pairs of roofing materials, Each of the roofing materials has a roof underwater side engaging portion located at the underwater edge of each roofing material and having a recess that opens to the abovewater side on the underside of each roofing material, and a roof abovewater side engaging portion located at the abovewater edge of each roofing material and having a recess that opens to the belowwater side on the upper side of each roofing material, and the roof underwater side engaging portions and roof abovewater side engaging portions of adjacent roofing materials are configured to be connected in the vertical direction of the roof by engaging with each other through the meshing of the recesses, The corner valley cover has a cover main body portion including the first cover portion, the second cover portion, and the intermediate cover portion, and a cover above-water side engaging portion connected to the above-water side edge portion of the cover main body portion and engaging with the roof above-water side engaging portions of the pair of roof materials arranged on the same tier as the corner valley cover so as to overlap from the inside of the recess, and the roof above-water side engaging portions of the pair of roof materials and the cover above-water side engaging portions of the corner valley cover overlapping the inside of the recess are configured to engage with the inside of the recesses of the roof below-water side engaging portions of a pair of roof materials arranged on the adjacent tier above the water side of the tier on which the pair of roof materials are located.

4. The corner valley structure according to claim 3, A corner valley structure in which the corner valley cover is connected to the underwater edge portion of the intermediate cover portion of the cover main body portion and further has an underwater embracing engagement portion that engages with the roof underwater engagement portions of the pair of roof materials arranged at the same level as the corner valley cover by embracing them from the outside.

5. The corner valley structure according to claim 4, The underwater side embracing engagement portion is The intermediate cover has an extension portion extending from the underwater edge of the intermediate cover portion to its underside, and an opposing plate portion extending from the lower edge of the extension portion along the corner valley to the abovewater side and facing the intermediate cover portion with a gap therebetween, The roof cover is configured to be able to engage with the underside of the roof waterline engaging portion of the pair of roof materials arranged at the same level as the corner valley cover by the lower surface of the intermediate cover portion, the upper surface of the opposing plate portion, and the extension portion so as to embrace it from the outside, A corner valley structure in which the tip of the opposing plate portion is configured to engage with the inside of the recess of the roof above-water side engagement portion of a pair of roof materials provided on the adjacent below-water side step of a pair of roof materials located on the same step.

6. The corner valley structure according to claim 5, The opposing plate portion has a pair of oblique sides that engage with the inside of the recesses of the abovewater side engaging parts of the roof of a pair of roof materials located in adjacent steps on the underwater side, a pair of side sides that are connected to the underwater ends of the pair of oblique sides and face each other in the orthogonal direction, and a base end side that connects the underwater ends of the pair of side sides and forms the lower edge of the extension portion, The tip of the opposing plate portion has a corner valley structure that includes the pair of oblique sides.

7. The corner valley structure according to claim 4, a pair of fixing members for fixing the corner valley cover to the pair of sheathing boards together with the pair of roofing materials located at the same level as the corner valley cover; The roofing material is then secured to the roof by a retaining member that is attached to the roofing material. The retaining member is then secured to the roof by a retaining member that is attached to the roofing material. The retaining member is then secured to the roofing material by a retaining member that is attached to the roofing material. A corner valley structure in which the other of the pair of fixing members engages with the roof above-water side engaging portion of the roof material arranged on the other side and the cover above-water side engaging portion formed on the second cover portion of the corner valley cover in a state in which both engaging portions overlap, and is fixed to the portion of the sheathing board located on the other side of the corner valley above the roof material.

8. The corner valley structure according to claim 4, a plurality of space arrangement members disposed in the spaces between the pair of sheathing boards and each of the plurality of pairs of roofing materials; A corner valley structure in which each of the plurality of spatial arrangement members is arranged so that, when viewed from the vertical direction of the sheathing board on which each spatial arrangement member is arranged, at least a portion of the spatial arrangement member overlaps with the corner valley cover provided on the step on which each spatial arrangement member is arranged.

9. The corner valley structure according to claim 8, The plurality of spatial arrangement members are arranged so that their respective lower surfaces abut the upper surfaces of the sheathing boards and their respective upper surfaces abut the lower surfaces of the roofing materials arranged at the same level as the respective spatial arrangement members, in a corner valley structure.

10. The corner valley structure according to claim 8, A corner valley structure in which each of the plurality of spatial arrangement members is fixed to the upper surface of each of the sheathing boards with an adhesive.

11. The corner valley structure according to claim 8, A corner valley structure in which each of the multiple spatial arrangement members is arranged so as to abut against the end surface of the roof above-water side engagement portion of the roof material located on the adjacent tier below the waterline of the tier on which each spatial arrangement member is arranged.

12. The corner valley structure according to claim 8, The corner valley is covered by a valley gutter, A corner valley structure in which the plurality of spatial arrangement members are fixed to the upper surfaces of the pair of sheathing boards, sandwiching the valley gutter therebetween.

13. The corner valley structure according to claim 4, The cover main body has an above-water edge, an below-water edge, and a pair of side edges that connect both ends of the above-water edge and the below-water edge and face each other across the corner valley, and the pair of side edges are formed so as to extend in the vertical direction of the roof on each of the sheathing boards on which they are located.

14. The corner valley structure according to claim 13, A corner valley structure in which a water-stopping material is attached to areas adjacent to each of the pair of side edges on the underside of the corner valley cover.

15. The corner valley structure according to claim 13, A corner valley structure in which a water-stopping material is attached to the water-side end of the underside of the cover main body at a location corresponding to the corner valley.

16. The corner valley structure according to claim 13, A corner valley structure in which water-stopping material is attached to both ends of the corner valley on the upper surface of the abovewater engaging portion of the corner valley cover and to the location corresponding to the corner valley.

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