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 present invention provides a horizontal roofing exterior structure in which an exterior material 1 is laid on a base 2, the exterior material having an engaging projection 13 formed on the upstream end of the face plate portion 11 and a fitting portion 12 into which the engaging projection 13 is fitted formed on the downstream end of the face plate portion 11, wherein the engaging projection 13 has a locking portion 131x formed thereon, which has an elastic flip-up piece 131 extending from the upstream end of the face plate portion 11 to the downstream side, and the fitting portion 12 has a space portion 122 into which the flip-up piece 131 of the engaging projection 13 is housed and a concave portion 123 into which the locking portion 131x is elastically locked.

Description

Technical Field

[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 by using an exterior material with a simple shape, and can minimize the members used.

Background Art

[0002] Conventionally, horizontal roofing materials have been laid by the following construction methods, and the former accounted for 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 methods that can reduce (eliminate) them.

[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 by using a hanger 3 provided with a fixing portion 20 and a hook portion 21, the hook portion 21 of the hanger 3 is engaged with the locking portion 10 on the lower stage side, and further, while 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 side is fixed to a purlin member D provided with a plurality of locking portions on its surface, and the upper water end of a board-shaped horizontal roofing plate 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, the exterior material having an engaging projection at the upstream end of the panel portion and a fitting portion at the downstream end of the panel portion into which the engaging projection is fitted, wherein the engaging projection has a locking portion formed thereon with an elastic flip-up piece extending from the upstream end of the panel portion toward the downstream side, and the fitting portion has a space portion that accommodates the flip-up piece of the engaging projection and a concave portion into which the locking portion is elastically locked.

[0008] Furthermore, the present invention also proposes a horizontal roofing exterior structure in which the exterior material is provided with a fixing portion for the substrate or a functional layer formed thereon in the fitting portion, and the engaging projection covers the fixing portion and locks (contacts) within the fitting portion.

[0009] Furthermore, the present invention also proposes a method for constructing a horizontal roofing exterior structure, characterized in that the locking portion of the engaging protrusion of the exterior material disposed on the downstream side is elastically engaged with the concave portion of the exterior material installed on the upstream side by inserting it against elasticity. [Effects of the Invention]

[0010] 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 a simple shape in which the engaging projection formed at the upstream end of the panel portion has a locking portion with an elastic flip-up piece extending from the upstream end of the panel portion toward the downstream side, and the fitting portion formed at the downstream end of the panel portion has a space portion that accommodates the flip-up piece of the engaging projection and a concave portion that elastically locks the locking portion. Therefore, it can be easily applied in the same way as the molding of general exterior materials. Furthermore, when constructing this exterior structure, the exterior materials can also be arranged by inserting them in a roughly parallel manner from the downstream side to the upstream side, as described above.

[0011] Furthermore, the exterior material is provided with a fixing portion for the substrate or a functional layer formed thereon in the fitting portion, and when the engaging projection covers the fixing portion and locks (contacts) within the fitting portion, a fastener is driven into this fixing portion to secure it. However, since the engaging projection covers this fixing portion, the driving portion of the fastener can be prevented from being penetrated by rainwater.

[0012] Furthermore, the construction method for the horizontally laid exterior roofing structure of the present invention can be easily applied without requiring any special skills or training. [Brief explanation of the drawing]

[0013] [Figure 1] (a) An enlarged side view showing the horizontal roofing exterior structure of Embodiment 1 of the present invention and its construction method, with the engaging projection of the downstream exterior material facing the fitting portion of the upstream exterior material; (b) An enlarged side view showing the engagement projection as it is inserted further; (c) An enlarged side view showing the engagement projection as it is inserted further; (d) An enlarged side view showing the engagement projection as it is inserted even further; (e) An enlarged side view showing the engagement projection as it is inserted even further; (f) An enlarged side view showing the engagement projection as it is inserted into the fitting portion. [Figure 2] (a) A side view showing the construction method of the horizontal roofing exterior structure of Example 1, with the downstream functional material facing the upstream functional material, and (b) A side view showing the functional materials connected in a stepped manner. [Figure 3] (a) A side view showing the functional layer formed in a stepped shape, with the engaging projection of the downstream exterior material facing the fitting portion of the upstream exterior material, and (b) A side view showing the exterior materials connected. [Figure 4] (a) A perspective view showing the state in which the exterior material is laid from the water side on a functional layer formed in a stepped manner, (b) A perspective view showing the state in which the water side exterior material faces the water side exterior material that has been installed, (c) A perspective view showing the state in which two exterior materials have been installed, and (d) A perspective view showing the state in which three exterior materials have been installed. [Figure 5](a) Side view showing the construction method of the horizontally laid exterior structure of Example 2, showing the state where the existing roof is formed; (b) Side view showing the state where the exterior material to be attached faces the underwater side of the uppermost exterior material laid on the existing roof; (c) Side view showing the state where the engaging convex portion of the exterior material to be attached faces the fitting portion of the uppermost exterior material that is already attached; (d) Side view showing the state where the engaging convex portion of the exterior material to be attached is engaged with the fitting portion of the uppermost exterior material that is already attached; (e) Side view showing the state where a fixture is being attached to the extending portion of the attached underwater exterior material; (f) Side view showing the state where the further underwater exterior material is facing. [Figure 6] (a) Side view showing the horizontally laid exterior structure of Example 3; (b) Enlarged side view showing the exterior material used. **Embodiments for Carrying Out the Invention**

[0014] The horizontally laid exterior structure of the present invention is a horizontally laid exterior structure in which an exterior material having an engaging convex portion at the upper water end of the panel portion and a fitting portion into which the engaging convex portion is fitted at the lower water end of the panel portion is laid on a base. The engaging convex portion is formed with a locking portion having a spring-up piece having elasticity from the upper water end of the panel portion to the underwater side. The fitting portion is provided with a space portion in which the spring-up piece of the engaging convex portion is accommodated and a concave portion in which the locking portion is elastically locked.

[0015] Also, the construction method of the horizontally laid exterior structure of the present invention is characterized in that the locking portion of the engaging convex portion of the exterior material disposed on the underwater side is elastically inserted into the concave portion of the exterior material attached to the upper water side against the elasticity.

[0016] The base is not particularly limited in its specific configuration and may refer to a framework formed of steel sections or the like, or a field material or a wood wool cement board laid on its surface. It is desirable to follow the flow direction. In addition, the illustrated embodiments described below show a structure in which a functional material having functions such as elasticity, heat insulation, and water stoppage is disposed on this base material, and a structure in which an existing roof having an existing roof material laid using hangers is disposed.

[0017] The face plate portion of the exterior material used in the present invention is laid on the base material as described above. An engaging convex portion is formed at the upper water side end of the face plate portion, and a fitting portion into which the engaging convex portion is fitted is formed at the lower water side end of the face plate portion. The engaging convex portion is formed with a locking portion having a spring-up piece having elasticity from the upper water side end of the face plate portion to the lower water side. The fitting portion includes a space portion in which the spring-up piece of the engaging convex portion is accommodated and a concave portion in which the locking portion is elastically locked. This exterior material is a member that forms an exterior surface on the base material. It is exclusively horizontally laid as in the illustrated embodiments described below. It may be directly attached to the base material or attached via a functional layer (functional material). In particular, its material and shape are not limited. Typically, known metal materials such as surface decorative steel plates, laminated steel plates, plated steel plates, stainless steel plates, aluminum alloy plates, titanium alloy plates, and copper plates having a thickness of approximately 0.4 to 1.6 mm are appropriately used by being formed into a predetermined shape by means such as roll forming. In the present invention, since the "spring-up piece" is configured to fold back from the upper water side end to the lower water side, it is elastically engaged by being inserted in an insertion state while resisting elasticity as shown in the above-described construction method.

[0018] The engaging convex portion is a portion where a locking portion having a spring-up piece having elasticity from the upper water side end of the face plate portion to the lower water side is formed. When this locking portion is inserted in an insertion state from the lower water side to the upper water side, it is inserted while resisting the elasticity from above. Therefore, when the elasticity is released (opened), the shape (angle) of the locking portion (spring-up piece) at the time of molding is restored, and even if a tensile (pull-out) stress acting on the face plate portion to the lower water side acts, the locking portion (spring-up piece) prevents pull-out. The spring-up piece in this locking portion may be in an upwardly inclined piece shape as long as the elasticity acts, or may be in a "U" shape with its upper end bent to the lower water side. That is, the tip of the spring-up piece may be in an upwardly inclined piece shape or in a "U" shape.

[0019] The fitting portion is the part into which the engaging projection is fitted, and comprises a space that accommodates the flip-up piece of the engaging projection, and a concave portion into which the locking portion, which is the tip of the flip-up piece, is elastically locked. In this way, since the locking portion, which is the tip of the flip-up piece, is locked into the concave portion, the fitting portion on the water side and the engaging projection on the water side are prevented from coming apart.

[0020] The substrate and its back surface structure in this invention are not limited in any way, and a wide variety of structures can be applied. Therefore, the surface shape is not specified in any way as long as it does not hinder the installation of the exterior material. Therefore, a configuration in which various functional materials are arranged as a functional layer having functions such as elasticity, heat insulation, and water sealing is also acceptable, or a configuration in which elastic materials, water-sealing materials, and heat-insulating materials are laminated individually.

[0021] The horizontal roofing exterior structure of the present invention, having such a configuration, 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 materials can be reduced, for example, components such as hangers that hold the exterior materials can be eliminated, thereby reducing the cost of the components themselves (component management costs, material costs), and also reducing 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 a simple shape in which the engaging projection formed at the upstream end of the panel portion has a locking portion with an elastic flip-up piece extending from the upstream end of the panel portion toward the downstream side, and the fitting portion formed at the downstream end of the panel portion has a space portion that accommodates the flip-up piece of the engaging projection and a concave portion that elastically locks the locking portion. Therefore, it can be easily applied in the same way as the molding of general exterior materials. Furthermore, when constructing this exterior structure, the exterior materials can also be arranged by inserting them in a roughly parallel manner from the downstream side to the upstream side, as described above.

[0022] Furthermore, the exterior material is provided with a fixing portion for the substrate or a functional layer formed thereon in the fitting portion, and when the engaging projection covers the fixing portion and locks (contacts) within the fitting portion, a fastener is driven into this fixing portion to secure it. However, since the engaging projection covers this fixing portion, the driving portion of the fastener can be prevented from being penetrated by rainwater.

[0023] As described above, the construction method for the horizontal roofing exterior structure of the present invention allows for elastic engagement by inserting the locking portion of the engaging projection of the exterior material, which is located on the downstream side, into the concave portion of the exterior material attached on the upstream side, while resisting elasticity. [Examples]

[0024] The horizontal roofing exterior structure of Embodiment 1 of the present invention shown in Figures 1(a) to (f) uses an exterior material 1 which is a horizontal roofing exterior material, on the surface of a functional layer 2 made of a functional material 3 disposed on a substrate (not shown), the functional layer 2 having an engaging projection 13 formed on the upper end of the face plate portion 11 and a fitting portion 12 into which the engaging projection 13 is fitted at the lower end of the face plate portion 11.

[0025] The engaging projection 13 is equipped with an elastic flip-up piece 131 extending from the upstream end of the faceplate portion 11 toward the downstream side, and a locking portion 131x is formed at its tip. In the figure, reference numeral 132 indicates the "U" shaped (horizontally convex) portion bent from the upstream end toward the downstream side, and the locking portion 131x indicates the tip of the flip-up piece 131. In this embodiment 1, the engaging projection 13 has a simple shape, formed by folding the upper edge of the faceplate portion 11 toward the surface, creating an inclined flip-up piece 131 and a lateral convex portion 132 at the folding base (corner).

[0026] The fitting portion 12 includes a space 122 that accommodates the flip-up piece 131 of the engaging projection 13, and a recessed portion 123x into which the locking portion 131x, which is the tip (upper end) of the flip-up piece 131 of the engaging projection 13, is elastically locked. In this embodiment 1, the fitting portion 12 is constructed by bending the lower end of the faceplate portion 11 toward the back side and bending its lower end toward the water side, and further bending its tip toward the back side in a folded manner to extend toward the water side. In the figure, reference numeral 121 indicates the portion bent toward the back side from the faceplate portion 11, reference numeral 123 indicates the horizontal piece-like portion formed by bending its lower end toward the water side, reference numeral 122 indicates the folded space portion formed at its water side end, and reference numeral 124 indicates the portion extending toward the water side. Since the locking portion 131 is the upper end of the flip-up piece 131, the concave portion 123x that locks with it is formed on the back side of the horizontal piece portion 123. That is, the horizontal piece portion 123 is bent in a horizontal S-shape, and a concave portion 123x that can lock the tip of the flip-up piece 131 (locking portion 131x) is formed on its back side. Furthermore, the extended portion 124 has a fixing portion 124x that is recessed toward the back side. Although not shown in the figure, this fixing portion 124x can be fixed to the functional layer 2 on the back side by driving a fastener such as a screw from above.

[0027] Furthermore, Figures 1(a) to 1(f) show the method for installing the exterior material 1 (assembling the exterior material 1), so the installation procedure will be explained below in order.

[0028] First, Figure 1(a) shows the state in which the engaging projection 13 of the exterior material 1 to be attached to the water-side exterior material 1, which is already attached to the functional layer 2, faces the fitting portion 12 of the water-side exterior material 1.

[0029] Next, Figure 1(b) shows the state in which the engaging projection 13 of the exterior material 1 to be attached has been inserted further, and the flipped-up piece 131 of the engaging projection 13 is in contact with the corner between the bent portion 121 and the horizontal piece portion 123.

[0030] Furthermore, Figure 1(c) shows a state in which the engagement projection 13 of the exterior material 1 to be attached has been inserted further, with the flipped-up piece 131 of the engagement projection 13 in contact with the corner between the bent portion 121 and the horizontal piece portion 123 as it is inserted.

[0031] Furthermore, Figure 1(d) shows a state where the engagement projection 13 of the exterior material 1 to be attached has been inserted further, with the flip-up piece 131 of the engagement projection 13 in contact with the horizontal piece-shaped portion 123 as it is inserted. Note that the locking portion 131x, which is the tip of the flip-up piece 131, is inserted while in contact with the uneven shape of the horizontal piece-shaped portion 123, so a large downward force acts on the flip-up piece 131.

[0032] Furthermore, Figure 1(e) shows a state where the engagement projection 13 of the exterior material 1 to be attached has been inserted even further, and the flip-up piece 131 of the engagement projection 13 is inserted while in contact with the horizontal piece-shaped portion 123. As it is inserted while in contact with the uneven shape of the horizontal piece-shaped portion 123, the elasticity of the flip-up piece 131 is gradually being restored at this point.

[0033] Figure 1(f) shows the state in which the engaging projection 13 of the exterior material 1 to be attached is inserted into the fitting portion 12 of the exterior material 1 on the water side. In this state, the lateral convex portion 132 of the engaging projection 13 is positioned close to the space 122 of the fitting portion 12 (indicated as 132, 122 in the figure), and the locking portion 131x is locked to the concave portion 123x (indicated as 131x, 123x in the figure).

[0034] Thus, the horizontal roofing exterior structure of Example 1 can be easily constructed on the functional layer 2 using exterior material 1 with a simple shape, and can be arranged by inserting it in a substantially parallel manner from the downstream side to the upstream side. Furthermore, the exterior material 1 used in the present invention has a simple shape in which the engaging projection 13 formed at the upstream end of the faceplate portion 11 has a locking portion 131x with an elastic flip-up piece 131 extending from the upstream end of the faceplate portion 11 to the downstream side, and the fitting portion 12 formed at the downstream end of the faceplate portion 11 has a space 122 in which the upstream end of the engaging projection 13 is accommodated and a concave portion 123x in which the tip 131x of the flip-up piece 131 of the engaging projection 13 is elastically locked. Therefore, it can be easily applied in the same way as the molding of general exterior materials.

[0035] Furthermore, the construction method for the horizontally laid exterior roofing structure of the present invention can be easily applied without requiring any special skills or training.

[0036] Figures 2(a),(b) and 3(a),(b) show the procedure for forming the functional layer 2 in the horizontal roofing exterior structure of Embodiment 1. On the back side of this functional layer 2, a base (roof sheathing) 4 is arranged along the slope, and the functional materials 3,3 that form the functional layer 2 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 resin such as expanded polystyrene or expanded polyethylene. The functional material 3 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 3,3 in the flow direction are connected in an overlapping manner to form a gapless functional layer 2. These adjacent functional materials 3,3 (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 3 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 3 has end shapes (protruding portion 31 and overlapping portion 32) that overlap with each other, forming a functional layer 2 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.

[0037] Furthermore, Figures 2(a), (b) and 3(a), (b) show the method for constructing the functional layer 2 in the horizontal roofing exterior structure, and the construction procedure will be explained below in order.

[0038] First, Figure 2(a) shows the state in which the overlapping portion 32 of the functional material 3 to be installed is facing the protruding portion 31 of the functional material 3 on the upper side, which is already installed on the roof sheathing 4. At this time, the functional material 3 is positioned at an angle so that the upper end (overlapping portion 32) is the lower end. Next, Figure 2(b) shows the state in which the overlapping portion 32 of the functional material 3 to be attached is overlapped with the protruding portion 31 of the functional material 3 on the water side. At this time, the overlapping state is formed by inserting the functional material 32 while it is tilted so that the overlapping portion 32 is at the lower end.

[0039] Furthermore, Figure 3(a) shows the state in which the engaging projection 13 of the exterior material 1 positioned in the middle section is inserted into the fitting portion 12 of the uppermost exterior material 1 to be attached and engaged. Figure 3(b) shows the state in which the engaging projection 13 of the exterior material 1 positioned in the middle is inserted into the fitting portion 12 of the uppermost exterior material 1 to be attached, and the locking portion 131x is locked into the concave portion 123x. The installation of the exterior material 1 in Figures 3(a) and 3(b) has been explained in detail in Figures 1(a) to 1(f) above, so it will be omitted here.

[0040] Figures 4(a) to 4(d) are perspective views showing the state in which the exterior material 1 is laid from the water side on top of the functional layer 2 formed by laying the functional material 3 in a stepped pattern. In other words, Figure 4(a) shows a state in which the exterior material 1 is laid on the functional layer 2, which is laid in a stepped manner along the flow direction. Therefore, this state is the same as the state shown in Figure 3(b).

[0041] As described above, this functional material 3 is a horizontally elongated molded body in which the overlapping portion 32 of the functional material 3 on the downstream side is connected in an overlapping manner to the protruding portion 31 of the functional material 3 on the upstream side. The raised base portion 33 formed on the downstream side of the overlapping portion 32 is in the shape of nine islands in total, with seven islands of a predetermined width in the center and half-width islands at the left and right ends. Therefore, each raised base portion 33 on the downstream side has a corner portion 34, a fixed surface portion 35, and a raised projection portion 36 that is wing-shaped (hexagonal) in plan view. Reference numeral 37 denotes a raised portion that is pentagonal in plan view and formed on the downstream side of the raised projection portion 36, and reference numeral 38 denotes a concave drainage channel (flow channel) formed between the overlapping portion 32, the raised base portion 33, and the raised projection portion 36.

[0042] Furthermore, the base material (roof sheathing) 4 formed on the back side of the functional material 3 is placed between the support materials (U-shaped molded materials) 4B, 4B arranged on the structural frame (C-shaped steel) 6, forming a support layer of a certain thickness.

[0043] Furthermore, Figure 4(b) shows the state in which the second layer of exterior material 1 is being inserted from the water side into the water side of the already installed water side exterior material 1, as indicated by the hatched arrow in the figure. Furthermore, Figure 4(c) shows the state in which two exterior materials 1,1 have been laid from the water side. Thus, Figures 4(a-c) are consistent with Figures 2(b) and 3(a) and (b). Figure 4(d) shows the state after the three exterior materials 1,1,1 have been laid.

[0044] The functional layer 2 shown in Figures 2(a), (b) and 3(a), (b) is formed by laying functional materials 3, 3 in a stepped pattern to create a functional layer without defects, and the exterior surface is formed without gaps on top of the stepped functional layer 2.

[0045] The construction method for the horizontal roofing exterior structure in Example 1, as described above, allows for easy installation using exterior materials 1 with a simple shape, with a functional layer 2 interposed on the substrate (roof decking) 4, and the materials can be arranged by inserting them in a substantially parallel manner from the downstream side to the upstream side. [Examples]

[0046] The horizontal roofing exterior structure of Embodiment 2 shown in Figures 5(a) to (f) consists of an existing roof 5 made of existing roofing material 5A, which is a horizontal roofing exterior material, laid on a frame 6 aligned with the flow direction via a roof decking material (underlayment) 4. The existing roof 5 is made of existing roofing material 5A, which has an engaging projection 13 formed on the upstream end of the face panel 11 and a fitting portion 12b into which the engaging projection 13 is fitted at the downstream end of the face panel 11. Note that the flow direction in Embodiment 2 is shown as approximately parallel in Figures (a) to (f).

[0047] In this embodiment 2, the existing roof 5 is formed by attaching the existing roofing material 5A to the surface of the underlayment (roof decking material) 4 arranged along the slope using hangers 5b. In the figure, reference numeral 5c indicates a fastener such as a screw that secures the hanger 5b, reference numeral 51 indicates the face plate 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 holding portion provided on the hanger 5b.

[0048] Furthermore, in this embodiment 2, the exterior material 1B has the same engaging projection 13 formed on the upper end of the faceplate portion 11 as in embodiment 1, but the configuration of the fitting portion 12b formed on the lower end of the faceplate portion 11 is different. It includes a horizontally concave space 122b into which the upper end of the engaging projection 13 engages, a triangular horizontal piece-shaped portion 123b into which the flip-up piece 131 is housed, and a concave portion 123bx into which the tip (locking portion) 131x of the flip-up piece 131 is elastically locked. However, since it has the same simple shape as embodiment 1, it can be easily applied in the same way as the molding of general exterior materials.

[0049] Furthermore, Figures 5(a) to 5(f) also show the construction method for the horizontal roofing exterior structure of Example 2, so the construction procedure will be explained below.

[0050] First, Figure 5(a) shows that the existing roofing material 5A is attached to the existing roof 5 by the hangers 5b which are already attached to the base (roof sheathing material) 4 with fasteners 5c, thus forming the existing roof 5. In this configuration, adjacent existing roofing materials 5A, 5A in the direction of flow are engaged at the downstream molded portion 52 and upstream molded portion 53 of the faceplate portions 51, 51, and the engaging portion is held by the holding portion 54 of the hanger 5b, forming an existing roof 5.

[0051] Next, Figure 5(b) shows the state where the exterior material 1B has already been attached to the existing roofing material 5A at the uppermost point (right edge of the drawing), and the exterior material 1B to be attached is facing the lower side of it. Note that the reference numeral 1c in the figure indicates a fastener such as a screw attached to the fixing part 124x. The exterior material 1B used in this embodiment 2 has the same engagement projection 13 formed on the upper end of the faceplate portion 11 as in embodiment 1, so the same reference numerals are used in the drawings and its description is omitted. However, the fitting portion 12b has a different configuration and includes a horizontally concave space 122b into which the upper end of the engagement projection 13 engages, a triangular horizontal piece-shaped portion 123b into which the flip-up piece 131 is housed, and a concave portion 123bx into which the tip (locking portion) 131x of the flip-up piece 131 is elastically locked. The "triangular horizontal piece-shaped portion 123b into which the flip-up piece 131 is housed" means a triangular horizontal piece-shaped portion 123b that forms the space into which the flip-up piece 131 is housed. That is, as shown in the figure, a triangular space into which the flip-up piece 131 can be housed is formed on the back side of the triangular horizontal piece-shaped portion 123b.

[0052] Furthermore, Figure 5(c) shows the state in which the engaging projection 13 of the exterior material 1B facing the waterline side is inserted into the fitting portion 12b of the uppermost exterior material 1B that has been installed, elastic recovery is performed, and the locking portion 131x is locked into the concave portion 123bx. This state is almost the same as the state in which, as shown in Figures 1(b) and (c), the flip-up piece 131 of the engaging projection 13 is compressed while in contact with the bent portion 121b and the horizontal piece-shaped portion 123b, deforms due to elastic stress received from above, and then elastically recovers as shown in Figures 1(d) and (e) by further insertion. Comparing the locking state between the concave portion 123bx and the locking portion 131x in this embodiment 2 with the locking state between the concave portion 123x and the locking portion 131x in embodiment 1, since the concave portion 123bx is the apex of the triangular space portion, a deeper locking is achieved, resulting in a more stable locking state.

[0053] Furthermore, Figure 5(d) shows the state in which the engaging projection 13 of the exterior material 1B facing the water side is engaged with the fitting portion 12b of the attached exterior material 1B on the water side. The extended portion 124 of the exterior material 1B, which is attached to the downstream side, is aligned with the existing roof 5 (existing roofing material 5A), and is secured by driving a fastener 1d into the fixing portion 124x from above (surface side).

[0054] Figure 5(e) shows the state where the exterior material 1B to be installed is facing the downstream side of the existing roof material 5A, which is the second from the upstream side as shown in the diagram, after the exterior material 1B has been installed as described above. Therefore, Figure 5(e) shows the exterior material 1B to be installed in Figure 5(b) positioned one step downstream.

[0055] Even in the horizontal roofing exterior structure of Example 2, which is constructed in this manner, it can be easily installed on the existing roof 5 that follows the direction of flow using exterior material 1B with a simple shape, and can be arranged so as to be inserted in a substantially parallel manner from the downstream side to the upstream side.

[0056] As described above, the exterior materials 1 and 1B of these embodiments 1 and 2 have an engaging projection 13 which is equipped with an elastic flip-up piece 131 extending from the upstream end of the faceplate portion 11 to the downstream side, and a locking portion 131x is formed at its tip. Therefore, even if the material is installed by inserting it from the downstream side in a substantially parallel manner, or by rotating it from a position that is less vertical than vertical, the flip-up piece 131 is easily elastically deformed, allowing it to be positioned in the predetermined location. In Patent Document 1, both the downstream fitting portion 6 and the upstream fitting portion 7 are formed in a U-shape, and are attached by rotating them significantly with the upstream end facing the lower end in a nearly vertical orientation. However, the upstream fitting portion 7, which is formed in a U-shape with a horizontal horizontal piece and a vertical vertical piece, is shaped in a way that makes it difficult to undergo elastic deformation, so it is not possible to insert it from the downstream side in a nearly parallel manner as shown in Figure 5.

[0057] In contrast, the exterior materials 1 and 1B of Examples 1 and 2 are configured such that the engaging projection 13 is equipped with an elastic flip-up piece 131 extending from the upstream end of the faceplate portion 11 toward the downstream side, which allows for installation by inserting it from the downstream side toward the upstream side in a substantially parallel manner. [Examples]

[0058] The horizontal roofing exterior structure of Example 3 shown in Figure 6(a) is constructed using the exterior material 1C shown in an enlarged view in Figure 6(b). The structure on the underside, including the existing roof 5, the underlayment (roof sheathing) 4, and the frame 6, is the same as that of Examples 1 and 2, etc., so the same reference numerals are used in the figures and their explanation is omitted.

[0059] The exterior material 1C used in this embodiment 3 has a faceplate portion 11 and a fitting portion 12b at its lower end that are the same as the exterior material 1B used in embodiment 2, so the same reference numerals are used in the figure and their explanation is omitted. However, the engaging projection 13c at its upper end has a water-repellent piece 133 that is bent downwards from the upper end of the flip-up piece 131c, and the convex portion (=the surface side that is convex upwards) formed by these flip-up piece 131c and water-repellent piece 133 is the locking portion 134. In other words, by having a water-repellent piece 133 that slopes downwards from the upper end of the flip-up piece 131c, the presence of this water-repellent piece 133 not only prevents rainwater from flowing back (rainwater running along the back surface of the flip-up piece 131c), but also physically improves (strengthens) the tip of the flip-up piece 131c. Furthermore, since the concave portion 123bx is a corner-shaped portion (= upward-convex back side) formed on the back side of the triangular horizontal piece portion 123b as described above, it can form a more stable engagement state with the locking portion 134, which is a convex portion (= upward-convex front side).

[0060] In this embodiment 3, compared to embodiment 2, the exterior material 1C has only a simple shape modification in which the engaging projection 13c at its upper end is extended from the upper end of the flip-up piece 131c to the lower end of the flip-up piece 133. However, in a similar state, when the "U" shaped (horizontally convex) portion 132 is engaged with the horizontally concave space 122b, the locking portion 134 is stably locked (engaged) by the concave portion 123bx, thus achieving a more stable integrated state than in embodiment 2.

[0061] Furthermore, when constructing the horizontal roofing exterior structure of this embodiment 3, the exterior material 1C can also be arranged in a manner similar to the construction of embodiment 2, by inserting it from the downstream side to the upstream side in a substantially parallel manner. By rotating the upstream exterior material 1C from a position facing inclined, it is possible to insert it from slightly above, and the engaging projection 13c can be reliably and easily engaged and locked into the fitting portion 12b.

[0062] Thus, the horizontal roofing exterior structure of Embodiment 3 of the present invention can be easily installed on a base (roof decking) 4 or existing roof 5 that follows the direction of flow, using exterior material 1C with a simple shape. Installation is possible by rotating the exterior material 1C on the upstream side from a position where it is facing inclined, allowing it to be inserted from slightly above, and the engaging projection 13c can be reliably and easily engaged and locked into the fitting portion 12b. [Explanation of Symbols]

[0063] 1,1B,1C Exterior materials 1d fixture 11 Face plate part 12,12b Fitting part 121 Folding section 122,122b Space part 123,123b Horizontal schistose 123,123bx concave part 124 Extension 124x fixed part 13,13c Engagement protrusion 131,131c flip-up piece 131x Locking part (tip of the flip-up piece) 132 Lateral convex part 133 Water-Returning Pieces 134 Locking part (convex part) 2 Functional layer 3. Functional materials 4 Groundwork (field material) 4B Support material 5 Existing roof 5A Existing roofing material 5b Hanging cord 5c Fixture 6 skeleton

Claims

1. A horizontal roofing exterior structure is laid on a substrate, wherein an exterior material is formed on the upper end of the face plate portion, and a fitting portion is formed on the lower end of the face plate portion into which the engaging projection is fitted, The engaging projection has a locking portion formed with an elastic flip-up piece extending from the upstream end of the faceplate portion to the downstream side. The horizontal roofing exterior structure is characterized in that the fitting portion comprises a space for accommodating the flip-up piece of the engaging projection and a concave portion into which the locking portion is elastically locked.

2. The exterior roofing structure according to claim 1, characterized in that the exterior material has a fixing portion for the substrate or a functional layer formed thereon in the fitting portion, and the engaging projection covers the fixing portion and locks (contacts) within the fitting portion.

3. A method for constructing the horizontal roofing exterior structure according to claim 1 or 2, A method for constructing a horizontal roofing exterior structure, characterized in that the locking portion of the engaging projection of the exterior material disposed on the downstream side is elastically engaged with the recessed portion of the exterior material installed on the upstream side by inserting it against elasticity.

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