JPH0444558A - double roof - Google Patents

Abstract

PURPOSE:To positively prevent the leakage of water in a room by a method in which a recession is formed between the uprising parts on both sides of a base roofing material, and at least one groove is formed in the inner and outer couplers of the base roofing material to introduce water into it. CONSTITUTION:Uprising parts 14 and 15 are formed on both sides of a base roofing material 12 made of bent metal plate such as painted steel plate, and a recession 16 is formed between the parts 14 and 15. A groove 18 is formed over the whole length along the eaves-ridge direction on the central part of the inner coupler 17 of the part 14. Water coming between the lapped part of the roofing materials 11 is discharged through the eaves top from recessions 16 on the groove 18 or directly from the recessions 16. The leakage of water from the base roofing material to a room can thus be exactly prevented even when top roofing material having bad rain proofness, such as tile block or natural slate, is used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a double roof that includes a top roofing material for surface decoration and a bottom roofing material for waterproofing.

[Conventional technology]

Conventionally, in Japan, roofing materials such as flat roofing made of metal plates, tile stick roofing,
Alternatively, tiled roofs are commonly used. Furthermore, in Europe and the United States, stone-based roofing materials such as natural slate and simple roofing materials such as Western tiles such as tile blocks are also used for roofs. However, in areas with a lot of rain such as Japan, roofs made of stone, tile blocks, or other roofing materials have poor rain-shedding performance and are considered unsuitable. However, in recent years, there has been a strong trend toward diversification of roofing materials, and roofing materials such as stone and tile blocks are now in demand for design reasons.

In order to meet the above-mentioned demand, the inventor first published the patent application
A double roof is proposed as shown in Publication No. 265050.

This double roof, as shown in Figures 12 and 13,
It is equipped with a large number of top roofing materials (1) for surface decoration made of tile blocks and a bottom roofing material (2) made of metal plates for waterproofing, and the bottom roofing material (2) is used for roof support such as main building material. Element(
3) Fixed on top, forming protrusions (4) along the eave direction on the under-roofing material (2) at required intervals in the left and right direction, and fixings provided on the upper surface of these protrusions (4). There is a protrusion (4) in the hole (4a).
) By engaging the locking claws (5a) of the locking members (5) provided on the upper surface, the locking members (5) are fixed on the protrusions (4), and these locking members (5) ), and the eave side part of the line side roofing material (1) is overlapped with the ridge side edge of the roofing material (1) on the eave side. It is laminated from the eave side to the line side.

This double-layered roof does not have sufficient rain-shedding performance from the overlapping part of the upper roofing material (1) made of tile blocks, and even if rainwater etc. enters below these materials, that is, on the indoor side, the lower roofing material (1) is It is guided to the recesses (6) between the protrusions (4) of the roofing material (2), flows down to the sides of these eaves, and is discharged from the eaves.

[Problem to be solved by the invention]

Conventional double-roofed roofs are constructed as described above, and the engagement holes (4a) are provided on the upper surface of the protrusions (4) of the lower roofing material (2), which prevents rainwater from leaking during rainstorms. Water may travel along the lower surface (back surface) of the roofing material (1) and enter between these lower surfaces and the upper part of the protrusion (4), causing a small amount of water to leak into the room from the engagement hole (4). , especially in the left and right direction
Both side edges of the contacting lower roofing material (1) are connected to the protrusions (4).
If they are connected at the top, there is a problem in that water may leak from the connection to the indoor side. Even if the upper roofing material such as tile block or natural slate is fixed on the protrusion of the lower roofing material using fixing devices such as screws,
It is difficult to prevent water from leaking into the room from the screw holes into which screws and the like fit.

This invention solves the above-mentioned problems, and even when using top roofing materials such as tile blocks and natural slate that do not have sufficient rain-shedding performance, it is possible to ensure that water does not leak to the indoor side from the bottom roofing board material. The purpose of the present invention is to provide a double roof with a relatively simple structure that can prevent the above-mentioned problems.

[i! Means to solve the problem]

The present invention provides a double-roofed roof comprising a top-thatched roofing material for surface decoration and a waterproofing under-thatched roofing material supported on a roof support member, wherein both edges in the left and right direction of the under-thatched roofing material are provided. forming a rising part on one side edge and the other side edge, respectively forming inner and outer engaging parts bent inward and outward in the left and right direction from above the rising part, and at least one of these engaging parts. A concave groove is formed along the direction of the eave, and the rising parts of both horizontally adjacent lower roofing materials are made to face each other. fixed on the support member;
The inner and outer engaging parts of both lower roofing materials are overlapped and engaged in the vertical direction, the groove is arranged in a portion closer to the center in the left-right direction than the rising part of one of the lower roofing materials, and the upper roofing material is material,
It is supported on the outer engaging portion of the lower roofing material and is fixed to the groove portion of the inner and outer engaging portions or the portion on the opposite side of the rising portion from the groove using a fixing device.

[For production]

In the double roof according to the present invention, a material such as tile blocks whose overlapping parts do not have sufficient rain-shedding performance is used as the upper roofing material, so that even if rainwater during a storm gets into the lower part of the upper roofing material, that is, on the indoor side, Most of the water that has entered falls onto the recesses between the rising parts provided on both side edges of the under-thatched roofing material, flows down to the eaves, and is discharged from the eaves, similar to the conventional method described above. In addition, a small portion of the water that has entered the indoor side is led between the lower surface of the upper roofing material and the upper surface of the outer engaging part of the lower roofing material; Since the joining part extends from the rising part of the other sub-roofing material to a part closer to the center in the left-right direction than the rising part of the other sub-roofing material, both edges of the outer engaging part in the left-right direction from the water to the concave portions of the adjacent lower roofing materials, where it joins with most of the water mentioned above and is discharged;
The water is divided into two parts that are guided by grooves formed in at least one of the outer and outer engaging parts of the lower roofing materials. The water guided into the groove does not flow over the rising part of the lower roofing material that formed this groove and flows out between the rising parts of both lower roofing materials, so it falls outside of the rising part. Water will not enter the part where the roofing material is fixed, but by improving the roofing material, water will not leak from the material to the indoor side without taking any special leakage prevention measures. The structure is relatively simple, as it reliably prevents this from occurring, and does not use a hanging member.

(Example〕 Embodiments of the present invention will be described below with reference to the drawings.

1, 2 and 3 show a first embodiment. In FIGS. 1 and 2, (11) is a top roofing material for surface decoration made of tile blocks, and (12) is a lower roofing material supported on a roof support member (13), which will be described later.

As shown in Figures 1 and 2, the lower roofing material (12) is
It is made of a bent metal plate such as a painted steel plate, and has rising parts (14) and (15) formed on both left and right edges, and a recessed part (16) formed between these parts. It is constructed in a rectangular shape. The rising portion (14) on the right edge is bent upward from the recess (16) at a right angle;
An inner engaging portion (17) is formed which is bent inward in the left-right direction from the upper edge of the rising portion (14).
A concave groove (18) is formed along the entire length along the eave direction in the central part in the width direction, and the rising part (14) and the inner engaging part (17) form a double layer that brings the metal plates into close contact. It is structured as follows. Then, as shown in Figure 's3, the inner engaging part (1
7) upper and lower plates (17a) on the side of the rising portion (14) from the groove (18).

A space (19) is formed between (17b).

At the lower edge of the rising portion (14) on the right side edge, a mounting portion (20) that is bent at a right angle outward in the left-right direction is connected. The rising portion (15) of the left side edge is bent obliquely outward and upward in the left-right direction from the recess (16), and bent outward in the left-right direction from the upper edge of the rising portion (15) parallel to the recess (16). An outer engaging portion (21) is formed, and a cover portion (21a) bent downward at right angles is connected to the outer edge of the outer engaging portion (21). In addition, the rising portions (14) on both side edges, (I
s) An intermediate support part (22) for supporting the roofing material (11) is protruded from one place or a plurality of places spaced apart from each other, and the intermediate support part (22) is connected to the rising part (14) of the right edge )
and the engaging portion (17).

2 using the under-roofing material (12) constructed as above.
To construct a heavy roof, the horizontally adjacent sub-roofing materials (12), (12) are combined with the main building material (23) and the base material (2) with a heat insulating function laid on the main building material (23).
4), and the mounting portion (20) of the left lower roofing material (12) is attached to the support member (13) using a mounting tool (25) made of screws or the like.
) to fix it on top. The rising part (14) of the left sub-roofing material (12) and the rising part (15) of the right sub-roofing material (12)
) are located between the mounting part (20) and the mounting tool (25), and these are arranged closer to the center in the left-right direction than the rising part (14) of the left lower roofing material (12). The concave groove (18) is covered with an outer engaging part (21) provided on the right undercoat (12), and the outer engaging part (21) and the inner engaging part (
By engaging with 17), the left and right adjacent lower roofing materials (12), (12) are connected in a vertical roofing manner. After that, the single roofing material (11) made of tile blocks is supported on the outer engaging part (21) and the intermediate support part (22), and the fixing devices (26) such as self-tapping screws are attached to the single roofing material (11).
11) From above, 1 roofing material (11), outer engaging part (2
1) and is tightened to the bottom of the groove (18) of the inner engaging part (17).

In addition, the single-roofing material (11) is made of a large number of sheets that are partially overlapped in the eave direction and left-right direction in the same way as conventional ones,
Further, the line-side one eave side end of the under-thatched roofing material (12) is constructed in the same manner as a conventional vertical roof.

Since the double roof of the first embodiment is constructed as described above, rainwater enters between the overlapping parts of the single roofing material (11) between the overlapping parts of the single roofing material (11) and enters the lower part of the roof, that is, the indoor side. Most of the water drains from the rising part of the sub-roofing material (12) (
It falls onto the recess (16) between 14) and (15), flows down to the eaves side of the recess (16) due to the roof slope, and is discharged from the eaves. In addition, a small portion of the water that entered the room
Water is guided between the lower surface of the roofing material (11) and the upper surface of the outer engaging part (21) of the lower roofing material (12), but the water introduced between them is Roofing material (12)
) extends from its rising portion (15) to the left-right center portion of the left-hand underlayment (12) from its rising portion (15). The concave portions (1B) and (18) of both the lower roofing materials (12) and (i2) adjacent from both left and right edges of the engaging portion (21)
), merges with most of the water mentioned above and is discharged from the eaves, and the other is the concave groove (
18) and one that flows down along the outer peripheral surface of the fixture (26). The water flowing down into the groove (18) flows down along the outer periphery of the fixture (26) because the fixture (26) is threaded into the bottom of the groove (18) and protrudes downward. Then, it drips from the lower end of the fixing device (26) into the recess (16) of the left lower roofing material (12) and is discharged from the eaves. In addition, even if water accumulates in the groove (18), it will climb over the rising part (15) of the left lower roofing material (12) and connect to this rising part (15) on the outside of the rising part (15). Since there is no leakage between the right lower roofing material (12) and the rising part (14), the attachment part (20) between the rising parts (14) and (15) is attached to the roof support member (13). ) to prevent water from entering the indoor side through the penetration part (25), and the fixing device (26) for single-roofing material (11).
One roofing material (11) from the penetration part and the outer engaging part (21)
Even if water enters between the upper surface and the upper surface, this water will flow from the overlapping part of the single roofing material (11) to the above-mentioned single roofing material (11).
11) Water that has entered between the lower surface and the upper surface of the outer engaging portion (21) is treated in the same manner as water. Moreover, the upper and lower plates (17a) on the side of the rising part (14) from the groove (18) of the inner engaging part (17)
Since a space (19) is formed between the upper and lower plates (17a) and (17b), water that has entered between the upper and lower plates (17a) and (17b) is prevented from being guided out of the rising part (14) by capillary action. It can definitely be prevented. In addition, even if the inner engaging part is constructed such that the upper and lower slopes are in close contact with each other throughout the inner engaging part without providing the space part (19), there is almost no chance of water getting wet from between these parts to the rising part (14).

In the first embodiment, the overlapping part in the left-right direction of one single-roofing material (11) adjacent to the eave direction is arranged at the center in the left-right direction of the other single-roofing material (11), so that a large number of In order to thatch the roofing material (11) in the direction of the eave, the upper lid and the lower roofing material (
11), (12) are matched, and the fourth
As shown in the figure, the lower roofing materials (12
), one roofing material (11) adjacent to the other in the eave direction is supported alternately on the outer engaging part (21) of One roofing material (11) is supported and fixed to the intermediate support part (22) of the book using the fixing device (26) in the same manner as described above, and these one roofing material (11) are attached to the lower roofing material (12). ) on the side edge of the outer engaging part (2
1) Just support it above.

FIG. 6 shows a first modification of the first embodiment.

In this modification, a rising portion (15) on the left side edge of the lower roofing material (12) is bent upward from a recess (16) at a right angle. Then, the lower roofing materials (12
), Among (12), the roof support member (
13) is located closer to the center in the left-right direction than the rising part (15) of the right under-roofing material (12) and covered with the concave portion (16), and the part fixed to the right under-roofing material (12) is ) is bent to the downward diagonally rising portion (15) side, and the cover portion (21a) is connected to the outer edge of the outer engaging portion (21) of the cover portion (21
At step a), engage so as to embrace the protruding edge (17a) that protrudes from the groove (18) of the inner engaging part (17) of the left lower roofing material (12) toward the opposite rising part (14) side. This is what I did.

FIG. 7 shows a second modification of the first embodiment.

In this modification, an inner engaging portion (
A groove (18) is provided in the groove (17), and the bottom of the groove (18) is located on the same plane as the groove (16).
) is brought into close contact with the side wall of the rising part (14) of the recessed groove (18), forming a protruding edge (17b) bent at right angles inward in the left-right direction from the side wall of the opposite rising part (14) of the groove (18);
Said anti-rising portion (14) side wall and protruding edge (17b)
The metal plates are stacked closely together in double layers. Then, the mounting tool (25) of the mounting part (20) of the left under-thatch roofing material (12) is installed.
) to the roof support member (13) is located closer to the center in the left-right direction than the rising part (15) that bends upward at right angles from the recess (16) of the right under-thatch roofing material (12). (16) and cover it with the right under-roofing material (12).
) is connected to the outer edge of the outer engaging portion (21) of the cover portion (21).
In a), the protruding edge (17b) of the left under-thatch roofing material (12)
are held and engaged.

Note that the configuration of the first and second modified examples other than those described above is the same as that of the first modification.
This is similar to the embodiment, and the same reference numerals as in FIGS. 1 to 5 in FIGS. 6 and 7 indicate corresponding parts.

Figures 8 and 9 show a second embodiment. In the second embodiment, the horizontally adjacent lower roofing materials (12), (12) are supported and fixed on the roof support member (13). After connecting them vertically, one roofing material (12) is placed on the outer engaging part (21) of (12) via a locking member (27).
11) is supported and fixed. That is, the locking member (27) includes a line-side locking part (29) bent diagonally upward toward the eaves from the line-side edge of the support part (28), and
) is a long material made of a bent product such as a painted steel plate, which has a protruding part (30a) projecting upward from the eave side edge of the eave side and an eave side locking part (30) bent diagonally downward to the line side. Drain holes (31) are formed at required intervals in the longitudinal direction on the eave side edge. The locking member (27) is attached to a plurality of underlay roofing materials (
The support part (28) is supported on the outer engaging part (21) and the intermediate support part (22) of 12) and arranged in the left-right direction perpendicular to the eaves direction, and the fixing device (26) such as a self-tapping screw is installed.
The groove (18) of the inner engaging part (17) is passed through the supporting part (28) and the outer engaging part (21) from above the supporting part (28).
Fix the tightening at the bottom. In this state, the locking member (27
) The drainage hole (31) provided in
Place them apart. After that, the line side nine eave side protrusions (32) and (33) protruding from the lower surface of the single roofing material (11) made of tile blocks are attached to the line side one eave side locking portion of the locking member (27). The single roof material (11) is fixed to the locking member (27) by being elastically locked to (29) and (30), respectively.

The configuration of the second embodiment other than those described above is the same as that of the first embodiment, and FIG. 8, '! In Figure J9, the same symbols as in Figures 1 to 5 indicate corresponding parts.

Since the double roof of the second embodiment is configured as described above, rainwater enters between the overlapping parts of the single roof material (11) between the overlapping parts of the single roof material (11) and enters the lower part of the roof, that is, the indoor side. Most of the water drains from the rising part of the sub-roofing material (12) (
It falls onto the recess (16) between 14) and (15), flows down to the eaves side of the recess (16) due to the roof slope, and is discharged from the eaves. In addition, among the water that entered the indoor side, the support part (28) of the locking member (27)
) Most of the water led upward falls from the drainage hole (31) provided at the edge of the eaves side of the locking member (27) into the recess (16) of the lower roofing material (12), and The wood (11) joins with the wood that has fallen into the recess (16) from the indoor side and is discharged from the eaves. And a small amount of wood is the fixture (26) of the support part (28).
Water is introduced from the penetrating portion between the lower surface of the support portion (28) and the upper surface of the outer engaging portion (21) of the lower roofing material (12). As in the case of , it is guided into the concave portion (16) of the sub-roofing material (12) adjacent in the left and right direction, and is reliably prevented from flowing between the rising portions (14) and (ls).

10 and 11 show a modification of the 'fS2 embodiment.

In this modification, the rising part (14) on the right side edge of the lower roofing material (12) is made into a V-shaped double wall where the metal plates are not in close contact with each other, and the left side edge is placed slightly upward. Stepped section (34)
The rising portion (
15) is bent, and the intermediate support portion (22) is a protrusion with a trapezoidal cross section with an open bottom surface, which are different from the lower roofing material of the second embodiment. Then, among the horizontally adjacent lower roofing materials (12), (12), the left lower roofing material (
12), which is fixed to the roof support member (13) by the mounting tool (25), is attached to the right lower roofing material (12).
) is covered with a step (34).

In addition, the locking member (27) does not have a locking part on the line side, but has an eave side locking part (30) that is folded back upwards in a horizontal U shape on the eave side edge, and One roofing material (11) is supported and fixed on the locking member (27) by locking the locking groove (35) of the top roofing material (1) at the 30th inch from the line side. It is.

The configuration of this modification other than that described above is the same as that of the second embodiment, and the same reference numerals as in FIGS. 8 and 9 in FIGS. 10 and 11 indicate corresponding parts.

Also,'! The locking member used in the J2 embodiment and its modified examples is not limited to a long one, but may be one in which the divided part is divided into a plurality of parts located on the recessed part of the sub-roofing material and the intermediate support part. The drainage hole may be omitted so that rainwater etc. led from the part to the support part can be drained away.

The double-roofed roof of the present invention is not limited to the configurations of the above-described embodiments and modifications, and the fixing device may be placed on the opposite side of the raised groove from the groove provided in the engaging portion, A concave groove is formed on both sides, and the concave grooves of the sub-roofing materials adjacent in the left and right direction are stacked and fitted vertically, or a concave groove is provided on the outer engaging part of the metal plate made of 2MM thread, and the bottom of this concave groove is Fixing nuts and bolts are fixed on the top by welding or gluing, and bolts and nuts are tightened from above the single roofing material or the locking member, or extruded aluminum products are used as the underlayment roofing material. Changes can be made as appropriate within the scope of the claims, such as using natural slate as a roofing material. Furthermore, this invention can be used as the exterior wall of a building by making the roofing board vertical.

(Effects of the Invention) The present invention provides a double-roofed roof comprising a single roofing material for surface decoration and a waterproofing under-roofing material supported on a roof support member, wherein the under-thatching roofing material is A rising portion is formed on both edges in the left and right direction, and inner and outer engaging portions are formed that bend inward and outward in the left and right direction from the rising portions on one side edge and the other side edge, respectively. A concave groove is formed along the eave direction in at least one of the joint parts, and the rising parts of both the horizontally adjacent lower roofing materials are made to face each other, and the raised parts that are continuous with the inner engaging part are formed on the outside in the left and right direction. fixing a sub-roofing material on the support member;
The inner and outer engaging parts of both under-roof roofing materials are overlapped and engaged in the vertical direction, the groove is arranged in a portion closer to the center in the left-right direction than the rising part of one of the under-roofing materials, and material,
Since it is supported on the outer engaging part of the under-roofing roofing material and fixed to the concave groove part of the inner and outer engaging parts or the part on the opposite side of the rising part from the concave groove using a fixing device, the following effects can be obtained. .

That is, in the double roof according to the present invention, a material such as tile blocks that does not have sufficient rain-shedding performance in the overlapping part is used as the single roof material, so that rainwater during a storm flows under the single roof material, that is, on the indoor side. Even if water does enter, most of the water that has entered falls onto the recesses between the rising parts on both sides of the roofing material, flows down to the eaves, and is discharged from the eaves, similar to the conventional method described above. Ru. In addition, a small portion of the water that has entered the indoor side is led between the lower surface of the first roofing material and the upper surface of the outer engaging part of the lower roofing material; Since the joining part extends from the rising part of the other lower roofing material to a part closer to the center in the left-right direction than the rising part of one of the adjacent lower roofing materials in the left-right direction, both sides of the outer engaging part in the left-right direction What is led from the edge to the recessed portions of the two adjacent lower roofing materials, merges with most of the water mentioned above, and is discharged, and at least one of the inner and outer engaging portions of both the lower roofing materials. The flow is divided into those guided by the grooves formed.

The water guided into the groove does not flow over the rising part of the lower roofing material that formed this groove and flows out between the rising parts of both lower roofing materials, so it falls outside of the rising part. Water will not get into the parts where the roofing material is fixed.

Therefore, by improving the sub-roofing material, it is possible to reliably prevent water from leaking into the room from the sub-roofing material without requiring any special leakage prevention measures, and furthermore, it is possible to eliminate the use of hanger members. The structure is also relatively simple.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional side view showing a double roof according to a first embodiment of the present invention, FIG. 2 is a partial cross-sectional front view, FIG. 3 is an enlarged cross-sectional front view of the outer engaging portion, and FIG. 5 and 5 are partial schematic plan views showing the installation states of different one-roofing materials, and FIGS. 6 and 7 are partial cross-sectional explanatory views showing the first and second modifications of the first embodiment, respectively. Figures 8 and 9
The figures are a partially sectional side view and a partially sectional front view showing a double roof according to a second embodiment of the present invention, FIG.
Fig. 1 is a partial sectional side view and a partial sectional front view showing a modification of the second embodiment, and Figs. 12 and 13 are a partial perspective view and a partial side sectional view showing a conventional double roof. . (11)...One roofing material, (12)...Sub-roofing material, (13)...Roof support member, (14), (15)...Rising part, (16)...
・Concave part, (17)...Inner engaging part,...Concave groove,
(19)...Space part,...Mounting part, (21)
... Outer engaging part, ... Intermediate support part, (23) ... Purlin material, ... Base material, (25) ... Mounting tool, ...
Fixing tool, (27)...Locking member,...Support part 1, (30)...Line side 1, Eave side locking part,...Drain hole 1, (33)...1 Roof Two eave side protrusions on the line side of the roofing material...
Step part, ...1 Roofing material locking groove.

Claims (6)

[Claims] (1) A double-roofed roof comprising a top-thatched roofing material for surface decoration and a waterproofing under-thatched roofing material supported on a roof support member, wherein both edges in the left-right direction of the said under-thatched roofing material A rising portion is formed, and inner and outer engaging portions are formed that bend inward and outward in the left and right direction from above the rising portion on one side edge and the other side edge, respectively, and at least one of these engaging portions is formed. A concave groove is formed along the direction of the eave, and the rising parts of both the lower roofing materials adjacent in the left and right direction are made to face each other, and the lower roofing material is placed on the outer side in the left and right direction of the rising part connected to the inner engaging part. It is fixed on a support member, the inner and outer engaging parts of both under-roofing roofing materials are overlapped and engaged in the vertical direction, and the groove is arranged in a portion closer to the center in the left-right direction than the rising part of one of the under-roofing roofing materials. Further, the upper roofing material is supported on the outer engaging part of the lower roofing material, and the fixing device is used to support the upper roofing material on the recessed groove part of the inner and outer engaging parts or the part on the side opposite to the rising part from the recessed groove. A double roof that is characterized by being fixed. (2) The under-roofing material is a bent product made of metal plates in which the engaging portions with grooves are closely stacked in claim (1).
) The double roof described in ). (3) The double-roofed roof according to claim 2, wherein the under-roofing material has a space between the upper and lower plates on the side rising from the concave groove of the double-layered engagement portion. (4) The lower roofing material has the mounting part bent outward in the left and right direction of the lower edge of the rising part that connects with the inner engaging part, and the rising part that connects with the outer engaging part is inclined diagonally outward and upward in the left and right direction. 3. The double roof according to claim 1, wherein the mounting portion is supported and fixed on a roof support portion below an inclined rise. (5) Claim (1) wherein the lower roofing material has an intermediate support portion protruding between the rising portions of both side edges to support the upper roofing material.
, (2), (3) or (4). (6) A claim in which the upper roofing material is supported and fixed on the outer engaging part of the lower roofing material via a locking member placed between the upper roofing material and the lower roofing material. 1), (2), (3), (
4) or the double roof described in (5).