Horizontal roofing exterior structure and its construction method

Abstract

This invention provides a horizontal roofing exterior structure and its construction method that minimize the number of components used by employing simple-shaped exterior materials, enabling a fitting method and construction from the ridge side to the eaves side. [Solution] The horizontal roofing exterior structure of the present invention is a structure in which an exterior material 1 is laid on a substrate 4, the upper side molded part 13 formed by bending the upper end of the face panel part 11 toward the surface side, and the lower end of the face panel part 11 has a fitting part 12 into which a water-repellent part 13 is fitted. The upper side molded part 13 has a water-repellent part 131 formed by bending the upper end of the face panel part 11 toward the lower side, and the lower side molded part 12 has a fitted part 120 formed by bending the lower end of the face panel part 11 toward the upper side and then bending it toward the lower side, with the lower end of the face panel part 11 opening toward the lower side, and a fixing part 124 extending toward the lower side. The fitted part 120 is characterized in that a space is formed further back than the opening part 120x, and the water-repellent part 131 is housed in this space.

Description

Technical Field

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[0001] The present invention relates to a horizontal roofing structure and a construction method thereof, which enable fitting methods and construction from the gable side to the eaves side with a simple-shaped exterior material to be used, and minimize the members to be used.

Background Art

[0002] Conventionally, horizontal roofing materials have been laid by the following construction methods, with the former being in the majority. · Construction from the eaves side towards the gable side · Construction from the gable side towards the eaves side In recent years, due to the soaring material costs, the aging and shortage of construction workers, work safety, etc., there has been a demand for construction that can reduce (eliminate) these problems.

[0003] As a construction method of constructing from the eaves to the gable as described above, for example, there is the construction method of Patent Document 1. This Patent Document 1 uses a horizontal roofing material 1 in which a locking portion 10 folded back to the front surface side is formed at the upper water end of the panel portion 1c, and an engaging portion 11 folded back to the back surface side is formed at the lower water end, and uses a hanger 3 having a fixing portion 20 and a hanging portion 21. By engaging the hanging portion 21 of the hanger 3 with the locking portion 10 on the lower stage side and further engaging the engaging portion 11 of the horizontal roofing material 1 on the upper stage side, a structure (method) of constructing from the eaves side towards the gable side is described. As a construction method of constructing from the gable to the eaves as described above, for example, there is the construction method of Patent Document 2. This Patent Document 2 describes a structure (method) in which a hanger member B having an engaging groove with an open lower water side is fixed to a purlin member D provided with a plurality of locking points on its surface, and the upper water end of a board-shaped horizontal roofing board A is held in the engaging groove of the hanger member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] However, the construction method described in Patent Document 1 involves workers standing on the already installed horizontal roofing material 1, laying the material from the uninstalled ridge side, and setting up scaffolding for the work. Working on the horizontal roofing material 1 presents problems such as dirt and damage, working from the ridge side presents safety issues for workers (workers face the eaves side relative to the slope), and setting up scaffolding increases costs. In addition, the use of hangers 3 makes material management cumbersome. Furthermore, in the construction method described in Patent Document 2, since the work is carried out from the ridge to the eaves, the work can be carried out without workers having to stand on the already laid horizontal roofing boards A. This has the advantage of preventing the aforementioned dirt and damage and providing excellent worker safety. However, the components used (rafter members D, hanger members B, etc.) are complex, leading to increased material costs and making the product expensive.

[0006] Therefore, the present invention aims to propose a horizontal roofing exterior structure and its construction method that minimize the number of components used by using simple-shaped exterior materials, enabling fitting methods and construction from the ridge side to the eaves side. [Means for solving the problem]

[0007] The present invention has been proposed in view of the above, and relates to a horizontal roofing exterior structure in which an exterior material is laid on a substrate, wherein an upper-side molded portion is formed by bending the upper end of the face panel portion toward the surface side, and a lower-side molded portion is formed by bending the lower end of the face panel portion toward the back side, wherein the upper-side molded portion has a water-repellent portion formed by bending the upper end of the face panel portion toward the lower side, and the lower-side molded portion has a fitted portion with an opening on the lower side and a fixing portion that extends toward the lower side formed by bending the lower end of the face panel portion toward the upper side and then bending it toward the lower side, and the fitted portion is connected in such a way that a space is formed further inside than the opening, and the water-repellent portion is housed in this space.

[0008] Furthermore, the present invention also proposes a method for constructing the aforementioned horizontal roofing exterior structure, characterized by: a first step of inclining the exterior material attached to the upstream side so that the upstream side molded portion of the exterior material disposed on the downstream side becomes the lower end; and a second step of inserting the water-repellent portion from the downstream opening of the fitting portion and housing the water-repellent portion in the fitting portion so that the angle of inclination becomes gentler. [Effects of the Invention]

[0009] The horizontal roofing exterior structure of the present invention can be easily installed on the substrate using exterior materials with a simple shape, and can be arranged from the downstream side (eaves side) to the upstream side (ridge side). Furthermore, the number of components other than the exterior material can be reduced, for example, by eliminating components such as hangers that hold the exterior material in place. This reduces the cost of the components themselves (component management costs, material costs), and also reduces the cost of installing those components. Therefore, it is possible to improve work efficiency related to construction (including material management). Furthermore, the exterior material used in the present invention has an upper-side molded section formed by bending the upper end of the panel portion toward the surface side, and a lower-side molded section formed by bending the lower end of the panel portion toward the back side. The upper-side molded section has a water-repellent section formed by bending the upper end of the panel portion toward the lower side. The lower-side molded section has a fitted section with an opening on the lower side, formed by bending the lower end of the panel portion toward the upper side and then bending it toward the lower side, and a fixing section that extends toward the lower side. The fitted section has a wide space behind the opening, and the water-repellent section is housed in this space, making it a simple shape that can be easily applied in the same way as the molding of general exterior materials. In particular, since elasticity (shape deformation and shape recovery) is not required in principle, thick synthetic resin molded plates and metal molded plates that cannot be expected to have elasticity can also be used as this exterior material.

[0010] Furthermore, the construction method for the horizontal roofing exterior structure of the present invention, both in its first and second steps, and its operating procedures, can be easily applied without requiring any special skills or training. [Brief explanation of the drawing]

[0011] [Figure 1] (a) A side view showing the horizontal roofing exterior structure of Embodiment 1 of the present invention, and (b) an enlarged side view of the exterior material used therein. [Figure 2] (a) A side view showing the construction method of the horizontal roofing exterior structure of Example 1, with the downstream exterior material inclined toward the installed exterior material; (b) A side view showing the water-repellent portion of the downstream exterior material toward the fitted portion of the installed exterior material; (c) A side view showing the water-repellent portion of the downstream exterior material toward the upstream side; (d) A side view showing the water-repellent portion of the downstream exterior material inserted into the fitted portion (space). [Figure 3](a) A side view showing the construction method of the horizontal roofing exterior structure of Embodiment 2 of the present invention, with the downstream exterior material inclined toward the installed exterior material; (b) A side view showing the water-repellent portion of the downstream exterior material toward the fitting portion of the installed exterior material; (c) A side view showing the water-repellent portion of the downstream exterior material toward the upstream side; (d) A side view showing the shaft portion of the water-repellent portion of the downstream exterior material inserted into the fitting portion (space); (e) A side view showing the water-repellent portion housed in the fitting portion; (f) A side view showing the water-repellent portion housed in the fitting portion and the downstream exterior material placed on the substrate; (g) An enlarged side view of the exterior material used in this example. [Figure 4] (a) An enlarged side view showing the lower water-repellent portion of the exterior material on the water side inclined toward the mating portion of the exterior material on the water side, (b) An enlarged side view showing the lateral convex portion of the water-repellent portion advancing toward the mating portion and the tip of the shaft portion facing toward the mating portion, (c) An enlarged side view showing the tip of the water-repellent portion further advancing toward the mating portion, (d) An enlarged side view showing the water-repellent portion of the exterior material on the water side beginning to be housed in the mating portion, and (e) An enlarged side view showing the water-repellent portion housed in the mating portion. [Modes for carrying out the invention]

[0012] The horizontal roofing exterior structure of the present invention is characterized in that an exterior material is laid on a substrate, in which an upstream molded portion is formed by bending the upstream end of the face panel portion toward the surface side, and a downstream molded portion is formed by bending the downstream end of the face panel portion toward the back side, a water-repellent portion is formed in the upstream molded portion by bending the upstream end of the face panel portion toward the downstream side, and a fitted portion with an opening on the downstream side and a fixing portion extending toward the downstream side are formed in the downstream molded portion by bending the downstream end of the face panel portion toward the upstream side and then bending it toward the downstream side, and the fitted portion is connected in such a way that a space is formed further inside than the opening, and the water-repellent portion is housed in this space.

[0013] Furthermore, the construction method for the horizontal roofing exterior structure of the present invention is characterized by comprising: a first step of tilting the exterior material attached to the upstream side so that the upstream side molded portion of the exterior material disposed on the downstream side becomes the lower end of the downstream side molded portion of the exterior material; and a second step of inserting the water-repellent portion through the downstream opening of the fitted portion and housing the water-repellent portion in the fitted portion so that the angle of inclination becomes gentler.

[0014] The aforementioned substrate does not particularly limit its specific composition, and even in the case of a structure formed from structural steel, it refers to roof sheathing materials or wood wool cement boards laid on its surface, and it is desirable that it be aligned with the direction of flow. The illustrated examples described later show structures in which functional materials with elasticity, heat insulation, and water-stopping properties are laid on this substrate, as well as structures in which an existing roof with existing roofing materials using hangers is laid.

[0015] The exterior panel used in the present invention is laid on a substrate aligned with the flow direction, as described above. The panel has a structure in which an upstream molded portion is formed by bending the upstream end of the panel toward the surface, and a downstream molded portion is formed by bending the downstream end of the panel toward the back. The upstream molded portion has a water-repellent portion formed by bending the upstream end of the panel toward the downstream, and the downstream molded portion has a fitted portion with an opening on the downstream side and a fixing portion that extends further downstream, formed by bending the downstream end of the panel toward the upstream and then bending it toward the downstream. In the present invention, "bending" can refer to either "curving" where the processed portion is curved or "folding" where the processed portion is substantially flat. In the illustrated embodiment described later, the processed portion refers to the "curved portion" and "folded portion" that form the "water-repellent portion" and the fitted portion. This exterior material is a member that forms an exterior surface on the base. It is exclusively laid horizontally as in the illustrated embodiments described later. It may be directly attached to the base or attached via a functional layer (functional material). In particular, its material and shape are not limited. Typically, a known metal material such as a surface decorative steel plate, laminated steel plate, plated steel plate, stainless steel plate, aluminum alloy plate, titanium alloy plate, copper plate, etc., with a thickness of approximately 0.4 to 1.6 mm, is formed into a predetermined shape by means such as roll forming and can be appropriately used. In addition, the "water-returning part" in the present invention has a substantially folded-back configuration from the upper water side to the lower water side. In the aforementioned construction method, it is inclined so that the water-returning part becomes the lower end and inserted into the fitting part while the inclination angle of the panel part is loosened from the bent tip of the water-returning part to the fitting part. Therefore, in principle, elasticity (shape deformation and shape recovery) is not required. Thus, in addition to the aforementioned materials, materials that cannot be expected to have elasticity, such as thick synthetic resin molded plates and metal molded plates, can also be applied as the material of this exterior material.

[0016] The water-returning part is a part of the upper water-side molded part formed by bending the upper water end of the panel part to the surface side. It is a processing part where an inclined part extending from the upper water end of the panel part to the surface side and the lower water side is formed. It may be a curved part or a part bent at a predetermined angle. This water-returning part is inclined so that the water-returning part becomes the lower end and inserted into the fitting part while the inclination angle of the panel part is loosened from the bent tip of the water-returning part to the fitting part. Therefore, this water-returning part can also be said to be a "part to be accommodated" accommodated in the fitting part, and in the illustrated embodiments described later, it refers to the entire water-returning part. In principle, elasticity is not required for this water-returning part. It may be a curved part (= Embodiment 1) extending from the upper water end to the surface side and the lower water side, an inclined upward inclined part (= Embodiment 2), or a "C" - shaped part with its upper end bent to the lower water side. Since this water-returning portion has an inclined portion that extends from the upper water surface toward the surface side and the underwater side, even if the panel portion is inclined so that the water-returning portion becomes the lower end, the water-returning portion can be inserted into the fitting portion (space portion) while being inserted into the fitting portion from the bent tip of the water-returning portion (the lower end of the water-returning portion in Example 1 and the upper end of the water-returning portion in Example 2) so that the inclination angle of the panel portion becomes gentle.

[0017] The fitting portion is a portion where the water-returning portion is fitted and includes a space portion where the water-returning portion is accommodated. Since the space on the back side of the opening portion is widely formed in this fitting portion, the water-returning portion accommodated in this fitting portion (space portion) cannot be detached from the opening portion when the inclination angle of the panel portion is gentle. Therefore, detachment between the fitting portion on the upper water side and the water-returning portion on the lower water side is prevented.

[0018] The base and the structure on its back surface in the present invention are not at all limited, and various structures can be applied. Therefore, the surface shape thereof is not specified at all as long as there is no problem when attaching the exterior material. Therefore, as a functional layer having functions such as elasticity, heat insulation, and water stoppage, a configuration in which a functional material having various functions is disposed, or a configuration in which an elastic material, a water-stopping material, and a heat-insulating material are individually laminated may be used.

[0019] The horizontally laid exterior structure of the present invention having such a configuration can be easily constructed on the base using an exterior material having a simple shape and can be disposed from the lower water side (eaves side) to the upper water side (building side). And the number of members other than the exterior material can be reduced. For example, members such as hangers for holding the exterior material can be eliminated, so that the cost of the members themselves (member management cost, material cost) can be reduced, and the cost of constructing those members can also be reduced. Therefore, workability improvement regarding construction (including member management) can be achieved. Furthermore, the exterior material used in this invention has a simple shape in which an upper-side molded portion is formed by bending the upper end of the panel portion toward the surface side, and a lower-side molded portion is formed by bending the lower end of the panel portion toward the back side. Therefore, it can be easily applied in the same way as the molding of general exterior materials. In particular, since elasticity (shape deformation and shape recovery) is not required in principle, even thick synthetic resin molded plates and metal molded plates that cannot be expected to have elasticity can be applied as this exterior material. Furthermore, the upstream molded portion has a water-repellent portion formed by bending the upstream end of the faceplate portion toward the downstream side, and the downstream molded portion has a fitting portion formed by bending the downstream end of the faceplate portion toward the upstream side and then bending it toward the downstream side, thereby forming a fitting portion with an opening toward the downstream side and a fixing portion that extends toward the downstream side. The fitting portion has a wide space behind the opening, and the water-repellent portion is housed in this space, so the water-repellent portion can be inserted into the fitting portion from the bent tip of the water-repellent portion and housed in the fitting portion in such a way that the inclination angle of the faceplate portion becomes gentler.

[0020] Furthermore, since the fixing portion of the exterior material, which extends downstream from the fitted portion, is the fixing portion to the substrate or a functional layer formed thereon, the upstream molded portion, including the water-repellent portion, covers the fixing portion. Therefore, even if a fastener is driven into this fixing portion, it is possible to prevent rainwater from seeping in from the portion where the fastener is driven in.

[0021] As mentioned above, the construction method for the horizontal roofing exterior structure of the present invention can be easily applied without requiring any special skills or training, neither in its first nor second step. In the following Example 1, the "bending" applied to the exterior material is an example of "bending" where the processed area is curved, while in the following Example 2, the "bending" is an example of "folding" where the processed area is approximately flat. In the following examples, the processed area refers to the "curved part" or "folded part" that forms the "water-repellent part" or the fitted part. [Examples]

[0022] In the horizontal roofing exterior structure of Embodiment 1 of the present invention shown in Figure 1(a), an exterior material 1 is laid on the surface of a functional layer 3 made of a functional material 3A disposed on a roof decking material (substrate) 4. The functional layer 3 has an upper side molded portion 13 formed by bending (flexing) the upper end of the face panel portion 11 toward the surface side, and an lower side molded portion 12 formed by bending (flexing) the lower end of the face panel portion 11 toward the back side. Figure 1(b) shows an enlarged view of the exterior material 1. The upstream molded portion 13 has a water-repellent portion 131 that is bent toward the surface and downstream, and the bent tip 131x is the curved lower end. The downstream molded portion 12 is bent toward the back and upstream, and then bent downstream to form a fitting portion (space) 120 that opens on the downstream side, and a fixing portion 124 that extends further downstream is provided.

[0023] As described above, the above-water side molded section 13 is equipped with a curved water-repellent section 131 formed by bending (bending) the above-water end of the faceplate section 11 toward the surface side, and the bent tip 131x points to the curved lower end. Reference numeral 132 in the figure and reference numeral 131y indicate the end of the water-repellent section 131 that is located furthest above the water.

[0024] The downstream molded portion 12 is a part formed by bending (curving) the downstream end of the faceplate portion 11 toward the back side, as described above, and is provided with a fitting portion (space) 120 that accommodates the water return portion 131 of the upstream molded portion 13, and a fixing portion 124 that extends toward the downstream side is provided on the downstream side. In the figure, reference numeral 120x indicates the opening at the lower end of the fitted portion (space) 120, reference numeral 121 indicates the folded-down portion where the lower end of the faceplate portion 11 is bent toward the back side, reference numeral 123 indicates the curved portion where the lower end of the folded-down portion 121 is curved upward (towards the front side) in a rounded shape, reference numeral 122 indicates the lower part thereof, and reference numeral 124x indicates a concave fixing portion into which a fastener (not shown) is driven. Although not shown in the figure, a fastener such as a screw can be driven into this fixing portion 124x from above to fix it to the functional layer 3 on the back side. As described above, the opening 120x indicates the gap (spacing) between the lower end of the vertically folded portion 121 and the horizontally fixed portion 124, and is the lower water end of the fitted portion (space) 120 into which the bent tip 131x of the upstream molding portion 13 (water return portion 131) is inserted, and is shown as a dotted line in the figure.

[0025] A base (roof sheathing) 4 is provided on the back side of the functional layer 3. The functional materials 3A, 3A that form the functional layer 3 are materials that have multiple functions (elasticity, heat insulation, watertightness, etc.) on their own, and are non-permeable molded materials (functional materials) formed from a single layer or laminate of synthetic resins such as expanded polystyrene or expanded polyethylene. The functional material 3A in the illustrated embodiment has a projection 31 at its downstream end (left end in the figure) with its upper half extending downstream (left side in the figure), and an overlapping portion 32 at its upstream end (right end in the figure) with its lower half extending upstream (right side in the figure). As a result, the projections 31 and overlapping portions 32 of adjacent functional materials 3A, 3A in the flow direction are connected in an overlapping manner to form a gapless functional layer 3. These adjacent functional materials 3A, 3A (projections 31 and overlapping portions 32) in the flow direction are connected by overlapping in a rabbet-like manner. Reference numeral 33 in the figure indicates a raised base portion that abuts against the projection 31 of the functional material 3A on the upstream side, reference numeral 34 indicates a corner portion formed downstream of the raised base portion 33, reference numeral 35 indicates a fixed surface portion formed further downstream of the corner portion 34, and reference numeral 36 indicates a raised convex portion formed further downstream. Therefore, the functional material 3A has end shapes (protruding portion 31 and overlapping portion 32) that overlap with each other, forming a functional layer 3 that supports the back surface of the exterior material 1 with raised base portion 33 and raised convex portion 36, and a drainage channel for water is formed on the surface. Although the drainage channel is not clearly shown in the illustration, the raised base portion 33 and raised convex portion 36 form a drainage channel (channel) between them.

[0026] Figures 2(a) to 2(d) show the construction method for the horizontal roofing exterior structure of this embodiment 1, where the flow direction is shown as approximately parallel. Figure 2(a) shows the first step of the construction method, in which the exterior material 1 on the downstream side (located in the center in the figure) to be installed has its faceplate portion 11 facing inclined, and the water-repellent portion 131 located at the lower end faces the opening portion 120x of the fitting portion 120 of the exterior material 1 on the upstream side (located at the right end in the figure) that is already installed.

[0027] Furthermore, Figures 2(b) and later show the second step of the construction method, in which the inclination angle of the faceplate portion 11 of the exterior material 1 to be installed remains almost unchanged, but the water-repellent portion 131 is inserted into the interior of the fitted portion 120 beyond the opening portion 120x, and its end portion 131y is close to the inner end of the fitted portion 120.

[0028] Furthermore, in Figure 2(c), although the faceplate portion 11 of the exterior material 1 to be installed is positioned so that it is tilted significantly (i.e., the angle of inclination is small and it is close to horizontal), the water-repellent portion 131 is not fully housed in the fitted portion 120, and its end portion 131y is in contact with the inner end of the fitted portion 120.

[0029] Furthermore, as shown in Figure 2(d), the water-repellent portion 131 of the exterior material 1 located in the center is positioned upward within the fitted portion 120 and is completely housed within the fitted portion 120 of the exterior material 1 on the water side. Accordingly, its faceplate portion 11 is placed on the surface of the functional material 3A. Furthermore, the exterior material 1 located at the far left of the figure, on the downstream side, has its faceplate portion 11 facing inclined, similar to the exterior material 1 located in the center in Figure 2(a).

[0030] Thus, the horizontal roofing exterior structure of this embodiment can be easily installed on the substrate 4 using exterior material 1 with a simple shape, and can be arranged from the downstream side (eaves side) to the upstream side (ridge side). Furthermore, the number of components other than the exterior material 1 can be reduced, for example, by eliminating components such as hangers that hold the exterior material. This reduces the cost of the components themselves (component management costs, material costs), and also reduces the cost of installing those components. Therefore, it is possible to improve work efficiency related to construction (including material management).

[0031] Furthermore, the exterior material 1 has an upper-side molded portion 13 formed by bending the upper end of the face panel portion 11 toward the surface side, and a lower-side molded portion 12 formed by bending the lower end of the face panel portion 11 toward the back side. The upper-side molded portion 13 has a water-repellent portion 131 formed by bending the upper end of the face panel portion 11 toward the lower side, and the lower-side molded portion 12 has a fitted portion 120 formed by bending the lower end of the face panel portion 11 toward the upper side and then bending it toward the lower side, which opens toward the lower side, and a fixing portion 124 that extends toward the lower side. The fitted portion 120 has a wide space behind the opening portion 120x, and the water-repellent portion 131 is connected in a state where it is housed in this space, so it can be easily applied in the same way as the molding of general exterior materials.

[0032] Furthermore, in this embodiment 1, a fixing portion 124 to the substrate 4 is provided on the downstream side of the fitted portion 120 of the exterior material 1, and the upstream side molded portion 13 covers the fixing portion 124 and is housed within the fitted portion (space) 120. Therefore, even if a fastener 1d is driven into the fixing portion 124x of the fixing portion 124, the upstream side molded portion 13 covers this fixing portion, thus preventing rainwater from seeping in from the driven portion of the fastener 1d. [Examples]

[0033] The horizontal roofing exterior structure of Embodiment 2 of the present invention shown in Figures 3(a) to (f) uses an exterior material 2 which is a horizontal roofing exterior material, on a roof decking material (substrate) 4 aligned with the flow direction (shown approximately parallel in the figures), with an upstream molded part 23 having a water-repellent part 231 at the upstream end of the face panel part 21, and a downstream molded part 22 having a fitted part (space) 220 in which the water-repellent part 231 is housed at the downstream end of the face panel part 21.

[0034] The exterior material 2 used in this embodiment 2 has a simple shape, as shown in an enlarged view in Figure 3(g), in which the upstream molded portion 23 is equipped with a water-repellent portion 231 that is formed in the shape of an inclined piece extending from the upstream end of the faceplate portion 21 toward the surface and downstream side. In the figure, reference numeral 231x indicates the bent tip which is the upper end of the water-repellent portion 231, and reference numeral 231y indicates the end of the water-repellent portion 231 that is located furthest upstream.

[0035] In the connected state, the fitting portion (space) 220 formed in the downstream molded portion 22 accommodates the water-repellent portion 231 of the downstream exterior material 2. In this embodiment 2, the downstream molding portion 22 is constructed by bending the downstream end of the faceplate portion 21 toward the back side, bending its lower end toward the upstream side, and further bending its tip toward the back side in a folded manner to extend downstream. Reference numeral 221 in the figure indicates the folded portion toward the back side from the faceplate portion 21, and reference numeral 223 indicates the bent portion formed by bending its lower end toward the upstream side in a triangular shape. The triangular space formed on the back side of this bent portion 223 is the fitted portion 220. Reference numeral 224 indicates the fixing portion that extends downstream from the fitted portion (space) 220. Furthermore, the fixing portion 224 has a recessed fixing portion 224x on the back side, and fasteners 2d such as screws can be driven into this fixing portion 224x from above to fix it to the roof sheathing (substrate) 4 on the back side.

[0036] In this embodiment 2, the roof decking (underlayment) 4 along the flow direction is constructed using an existing roofing material 5A, which is a horizontally laid exterior material in which a downstream molded portion 52 is formed at the downstream end of the planar portion 51 and an upstream molded portion 53 is formed at the upstream end. In this embodiment 2, the flow direction of the roof decking (underlayment) 4 is shown to be approximately parallel in Figures 3(a) to (f). The existing roofing material 5A is attached to the surface of the roof decking material (underlayment) 4 using hangers 5b. In the figure, reference numeral 5c indicates fasteners such as screws that secure the hangers 5b, reference numeral 51 indicates the planar portion of the existing roofing material 5A, reference numeral 52 indicates the downstream molded portion of the existing roofing material 5A, reference numeral 53 indicates the upstream molded portion of the existing roofing material 5A, and reference numeral 54 indicates the retaining portion provided on the hangers 5b.

[0037] Figure 3(a) shows the downstream exterior material 2 to be installed, with its faceplate portion 21 facing in an inclined manner, and the inclined, piece-shaped water-repellent portion 231 located at the lower end facing above the fixing portion 224 of the installed exterior material 2. The dotted line in the figure indicates the opening 220x at the lower end of the fitted portion (space) 220.

[0038] Furthermore, Figure 3(b) shows a state in which the inclination angle of the faceplate portion 21 of the exterior material 2 on the downstream side to be attached remains almost unchanged, but the end portion 231y of the water-repellent portion 231 is in contact with the fixing portion 224, and the bent tip 231x of the water-repellent portion 231 is inserted into the fitting portion (space portion) 220.

[0039] Furthermore, in Figure 3(c), although the inclination angle of the faceplate portion 21 of the exterior material 2 on the downstream side to be installed remains almost unchanged, the bent tip 231x of the water-repellent portion 231 is inserted even deeper into the interior of the fitted portion (space) 220.

[0040] Furthermore, Figure 3(d) shows that the faceplate portion 21 of the exterior material 2 on the downstream side to be installed is tilted significantly (i.e., the inclination angle is small and it is close to horizontal), and the entire inclined piece-shaped water-repellent portion 231 is positioned inside the fitted portion (space) 220.

[0041] Furthermore, Figure 3(e) shows that the water-repellent portion 231 of the exterior material 2 facing the downstream side is engaged and housed in the fitted portion (space) 220 of the installed upstream exterior material 2. That is, the water-repellent portion 231 is almost housed in the fitted portion (space) 220, and its bent tip 231x is loosely engaged with the corner on the back side of the triangular bent portion 223. At this time, the rear end 231y of the water-repellent portion 231 is loosely engaged with the rear side of the fitted portion (space) 220, but the fixing portion 224 located on the downstream side of the exterior material 2 is located slightly above (on the surface side) than the existing roof (existing roofing material 5A).

[0042] In Figure 3(f), the water-repellent portion 231 is fully housed in the fitted portion (space) 220, and its bent end 231x is engaged with the corner on the back side of the triangular bent portion 223. In this state, the fixing portion 224 of the exterior material 2 is in contact with the surface of the existing roof (existing roofing material 5A), so the fixing device 2d is driven into the fixing portion 241x to attach it. That is, the water-repellent portion 231 is fully housed in the fitted portion (space) 220, and the rear end 231y of the water-repellent portion 231 is engaged with the rear end of the fitted portion (space) 220.

[0043] The key parts of the construction method for the horizontal roofing exterior structure of this embodiment 2 are shown in enlarged view in Figures 4(a) to (e).

[0044] Figure 4(a) shows the faceplate portion 21 of the exterior material 2 on the downstream side to be installed, which slopes downward from the downstream side towards the upstream side, with the end portion 231y of the water-repellent portion 231 located at the lower end in contact with the fixing portion 224. The dotted line in the figure shows the behavior in which the end portion 231y of the water-repellent portion 231 contacts the surface of the fixing portion 224, and the water-repellent portion 231 rotates to be housed in the fitting portion (space) 220.

[0045] Furthermore, in Figures 4(b) and 4(c), the inclination angle of the faceplate portion 21 of the downstream exterior material 2 to be installed and the position of the inclined water-repellent portion 231 remain almost unchanged, but in Figure 2(b), the tip (bent end portion 231x) faces the opening portion 220x at the downstream end of the fitting portion (space portion) 220, while in Figure 2(c), the bent end portion 231x is located inside it (upstream of the opening portion 220x).

[0046] Furthermore, Figure 4(d) shows that the faceplate portion 21 of the exterior material 2 on the downstream side to be installed is positioned so that it is tilted significantly (i.e., the inclination angle is small and it is close to horizontal), and the bent end portion 231x of the inclined piece-shaped water-repellent portion 231 is engaged with the corner on the back side of the triangular bent portion 223, but the entire water-repellent portion 231 is not completely housed in the fitted portion (space) 220.

[0047] Figure 4(e) shows that the water-repellent portion 231 of the exterior material 2 facing the water side is engaged with the fitted portion (space) 220 of the attached upper water side exterior material 2. That is, the inclined piece-shaped water-repellent portion 231 is housed in the fitted portion (space) 220, and the end portion 231y of the water-repellent portion 231 is brought close to (engaged with) the inner end of the fitted portion (space) 220.

[0048] Thus, the horizontal roofing exterior structure of Example 2 can be easily constructed using exterior material 2 with a simple shape on roof sheathing (substrate) 4 that follows the direction of flow, and an exterior surface can be easily formed on various substrates. In other words, the exterior material 2 used in the present invention has an upstream molded portion 23 with a water-repellent portion 231 at the upstream end of the faceplate portion 21, and a downstream molded portion 22 with a fitted portion (space) 220 into which the water-repellent portion 231 is fitted at the downstream end of the faceplate portion 21. The water-repellent portion 231 has an inclined piece-shaped water-repellent portion 231 that extends from the upstream end of the faceplate portion 21 to the downstream side, and the fitted portion 220 has a space into which the water-repellent portion 231 is housed. Because it has a simple shape, it can be easily applied in the same way as the molding of general exterior materials. In particular, since elasticity (shape deformation and shape recovery) is not required in principle, even thick synthetic resin molded plates and metal molded plates that cannot be expected to have elasticity can be applied as this exterior material.

[0049] Furthermore, the construction method for the horizontal roofing exterior structure in this embodiment 2, both in its first and second steps, can be easily applied without requiring any special skills or training.

[0050] Furthermore, in these two embodiments as well, a fixing portion 224 to the substrate 4 is provided on the downstream side of the fitted portion 220 of the exterior material 2, and the upstream molded portion 23 covers the fixing portion 224 and is housed within the fitted portion (space) 220. Therefore, the fixing device 2d is driven into the fixing portion 224x of the fixing portion 224 to secure it, but since the water-repellent portion 231 covers this fixing portion, even if the fixing device 2d is driven in, the upstream molded portion 13 covers this fixing portion, thus preventing rainwater from seeping in from the driven portion of the fixing device 1d. [Explanation of Symbols]

[0051] 1,2 Exterior materials 1D, 2D Fixtures 11,21 Panel Section 12,22 Underwater side forming part 120,220 Fitted Parts (Space Parts) 120x, 220x (the opening part of the mating section) 121,221 Ori Shitabe 123 Wanqu Department 124,224 Fixing part 124x,224x fixation part 13,23 Water-side forming part 131,231 water return part 131x,231x 131y,231y (water return section, water surface side) end 223 Folded section 3. Functional layer 3A Functional Materials 4. Wild timber (ground timber) 5A Lower repair material 5b Hanging 5c Fixture 6. Body

Claims

1. A horizontal roofing exterior structure is laid on a substrate in which an exterior material is formed, in which an upper-side molded portion is formed by bending the upper end of the panel portion toward the surface side, and a lower-side molded portion is formed by bending the lower end of the panel portion toward the back side. The above-water side molding section has a water-repellent section formed by bending the above-water end of the faceplate section toward the downstream side. The downstream molding portion is formed by bending the downstream end of the faceplate portion toward the upstream side, and then bending it toward the downstream side, thereby forming a fitting portion with an opening on the downstream side, and a fixing portion that extends further toward the downstream side. The horizontal roofing exterior structure is characterized in that the fitting portion has a wider space formed behind the opening, and the water-repellent portion is housed in this space.

2. A method for constructing a horizontally laid exterior roof structure according to claim 1, A first step involves tilting the exterior material, which is positioned on the downstream side, so that its upper-side molded portion faces the downstream-side molded portion of the exterior material, which is positioned on the downstream side, so that its lower end becomes the lower end. A method for constructing a horizontal roofing exterior structure, characterized by a second step of inserting the water-repellent portion into the fitted portion through the lower-side opening of the fitted portion while housing the water-repellent portion in the fitted portion so that the angle of inclination becomes gentler.

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