JPH0730604B2 - Girder wall of roof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a roof girder wall fitting part for preventing water from leaking from a space between a roof on a lower floor of a building and a girder wall on an upper floor to an indoor side. .

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 60-215936.
As shown in the publication, an inner layer material is laid on a base member such as a purlin, and a mounting member such as rafters is supported on a water leakage prevention plate laid on the inner layer material and fixed on the base member, Roofing material on the member, between the roofing material and the water leakage prevention plate,
There was a roof with a drainage space that communicated with the opening in the eaves.

Further, the girder face wall fitting part (3) provided between the roof (1) on the first floor and the girder face wall (2) on the second floor shown in FIG.
As an example, the upper edge of the rain presser (4) is supported and fixed to the girder wall (2), and the lower edge of the rain presser (4) abuts on the girder side of the roof material (6). By this, the water flowing down the outdoor side surface of the girder wall (2) is roofed on the roof material (6) through the rain presser (4) and drained from the eaves of the roof material (6) to a gutter (not shown). There was something.

[0004]

Generally, in the girder wall wall joint portion of the roof, water such as rainwater flows down on the outdoor side surface of the girder wall of the upper floor, and the upper surface of the roof material of the lower floor is blown to this water by wind. Water such as rainwater that blows up collides, so water leaks easily to the inside of the room.As with the conventional roof described above, a water leak prevention plate is laid under the roof material via a space for drainage. However, water leakage may occur when the conventional girder wall connection part is stored.

That is, in the conventional housing of the girder wall fitting section,
Due to manufacturing errors in the rain presser, improper installation of the rain presser, etc., rainwater may be discharged to the indoor side of the rain presser from between the lower edge of the rain presser and the top surface of the roof material, or from the seam when the rain presser is spliced. Such as water enters the inside of the girder surface wall fitting part inside, such as dripping inside the girder surface side (indoor side) edge of the water leakage prevention plate and the outside surface of the girder surface. There was a leak.

In particular, when tiles and natural slate are used as a roofing material and these are roofed in a building having a steel frame structure, there has been a problem that water leakage frequently occurs at the girder wall connection portion.

Further, in the draining device for the outer wall surface disclosed in Japanese Utility Model Publication No. 57-143317, there is disclosed a construction in which a drainage drain is attached to the indoor side of the rain cover, but the lower end of the drainage drain is Since it is located on the roofing material, the rainwater received at the drainage drain flows on the roof. However, since the roof material and the lower end of the rain cover are sealed with caulking material, there is a problem that rain water loses its place and stays on the back surface of the rain press plate.

Further, since there is not enough space between the roof plate, the drainage plate and the rain plate, there is a risk that the rainwater may be sucked in due to the capillary phenomenon.

Further, the roof rain presser structure disclosed in Japanese Utility Model Publication No. 60-16176 is one in which the one end is raised and the other end is positioned on the back side of the roofing material. It has some in common with. However, as is clear from Fig. 3, since the rain presser has a slope from the depth direction to the front side, and the wasteboard is also arranged from the back to the front, that is, along the slope, However, there is a problem in that the configuration is significantly different from that of the present invention, which is arranged in a direction orthogonal to each other.

The present invention solves the above-mentioned problems, and even if water such as rainwater enters the indoor side of the rain presser, it is possible to surely prevent the water from leaking to the indoor side of the girder wall fitting section. It is an object of the present invention to provide a girder wall wall joint that can prevent water leakage even in a roof using a roofing material such as a tile that easily leaks water.

[0011]

DISCLOSURE OF THE INVENTION The present invention relates to a girder wall joint portion of a roof, wherein the roof has a capillarity for drainage under a roof material such as a metal plate, a tile or a natural slate. It has a water leakage prevention plate arranged on the base member through a space that does not occur, and the lower edge of the rain presser in the girder wall fitting section is the top surface of the roof material of the lower floor. And the upper part of the contact part is supported by the girder wall of the upper floor, and the inner rain presser is arranged on the indoor side of the rain presser, and the lower edge of the inner rain presser is It is characterized in that it is arranged between the water leakage prevention plate of the roof on the lower floor and the roof surface part, and the upper edge of the inner rain presser is supported by the girder wall.

[0012]

[Operation] For the girder wall wall fitting portion of the roof according to the present invention, the roof has a space below the roof material such as a metal plate, a tile, or a natural slate, which does not cause a capillary phenomenon for drainage. Having a water leakage prevention plate arranged on the base member,
Of the storage of the girder wall attachment section, the lower edge of the rain presser is brought into contact with the upper surface of the roof material of the roof of the lower floor, and the portion above the abutting portion is supported by the girder wall of the upper floor. In addition, an inner rain presser is installed on the indoor side of the rain presser, and the lower edge of this inner rain presser is placed between the water leak prevention plate of the roof on the lower floor and the roof surface layer part. Since the upper edge of the girder is supported on the girder wall, even if water such as rainwater enters the inside of the rain presser due to poor construction, etc., this water will be on the water leakage prevention plate along the outside surface of the inner rain presser. Run down to.

Since the water leakage prevention plate has a slope that rises toward the girder surface side edge (indoor side edge), the water that has run down leaks to the girder surface side more than the lower edge of the inner rain presser. It does not flow on the upper surface of the prevention plate, it flows down by the slope and is discharged from the eaves of the space for drainage to the outside of the roof, but at this time, the space is a sufficient space that does not cause a capillary phenomenon. Therefore, there is no risk of rainwater staying inside.

[0014]

[Embodiment] Hereinafter, the storage of the girder wall fitting portion of the roof according to the first embodiment of the present invention will be described. FIG. 1 is a vertical sectional side view of the first embodiment.

(7) is a base member composed of a purlin made of C-shaped steel, and a plurality of base members are arranged at predetermined intervals in the eaves direction.

A large number of inner layer materials (8) made of hard wood wool etc. are laid on the base member (7), and a water leakage prevention plate (9) is supported on the inner layer material (8) to prevent water leakage. Prevention plate (9)
Is made of a water resistant material such as a thin galvanized steel sheet.

A plurality of metal rafters (10) are supported on the water leakage prevention plate (9) at predetermined intervals, and the rafters (1
0) is orthogonal to the base member (7) and is fixed on them by the rafter fixing device (11) through the inner layer material (8).

That is, as shown in FIG. 2 in which one part of the rafter fixing portion is shown, the rafter fixing device (11) includes a locking metal fitting (1).
2) is hooked on the base member (7) from below, bypasses the opening of the base member (7) and is projected onto the base member (7), and is attached to a portion of the locking metal fitting (12) located on the base member (7). The lower end of the bolt (13) is screwed.

The bolts (13) are provided with inner layer materials (8), (8) adjacent to each other in the direction orthogonal to the longitudinal direction of the rafters (10).
Notches (8a), (8a) formed on the opposite end faces of No. 1 and the notches (8a), (8a) above the inner layer members (8), (8), projecting above these and further adjoining water leaks. Edge protrusions (9a), (9a) of the prevention plates (9), (9)
Of the lower nut (15) and the upper end of the bolt (13) which are passed through the notches and the press fittings (14) provided in the overlapping portion of the By means of the upper nut (16) screwed to the holding metal fitting (14) and the adjacent water leakage prevention plates (9), (9)
The edge protrusions (9a) and (9a) are fixed together.

A rafter (10) having a substantially hat-shaped cross section is arranged on the holding metal fitting (14) so as to straddle the upper nut (16) and the bolt (13), and both side flanges (10a) of the rafter (10), (10a) is supported on the pressing metal fitting (14). Recesses (10b) provided between both sides of the rafter (10) and both side flanges (10a), (10a),
A wedge plate (17) is provided between (10b) and the folded portions (14a), (14a) provided on both sides of the holding metal fitting (14).
The rafter (10) is fixed to the holding metal fitting (14) by driving (17). The rafter fixing devices (11) described above are provided at appropriate intervals in the longitudinal direction of all rafters (10). Further, in FIG. 2, (18) is an asphalt waterproofing material such as asphalt roofing and asphalt felt, and this waterproofing material (18) is laid on the entire surface of the inner layer materials (8), (8).

On the rafters (10), the suspension members (19) are fixed by appropriate means, and a large number of the suspension members (19) are arranged at predetermined intervals in the longitudinal direction of the rafters (10). A ridge-side end portion of a backup material (20) such as a heat insulating plate is fitted between the step portion (19a) of the ridge-side suspension member (19) and the upper surface of the rafter (10), and the suspension member is adjacent to the eaves. Step (19a) of child (19)
The eaves side end of the backup material (20) is supported on the eaves side end, and the eaves side end is received and positioned by the locking part (19b) protruding above the step (19a) of the suspension (19). ing. A large number of backup materials (20) are laid on the water leakage prevention plate (9) via a space (21) for heat insulation and drainage.

In the locking part (19b) of the suspension (19), the eaves side locking part (6a) of the roof material (6) made of a metal plate on the ridge side,
A similar roof material (6) on the eaves side is locked to the ridge side locking portion (6b), and a large number of roof materials (6) are backed up (2
0) It is overlaid on the top.

The space portion (21) is communicated with an opening provided in the eaves end portion by an appropriate means, and forms a sufficient space portion that does not cause a capillary phenomenon. In addition, the space part (2
The roof surface layer portion (22) is configured with the roof material (6) and the backup material (20) arranged above 1) as main members.

The roof (1) of the upper floor constructed as described above
And the girder wall (2) on the lower floor, a girder wall fitting (3) is constructed.

That is, the girder side edges of the inner layer material (8) and the water leakage prevention plate (9) extend to the inside of the girder wall (2) below the girder side edges of the roof surface layer portion (22). The girder surface side edge portion (9b) of the discharge / water leakage prevention plate (9) further projects toward the indoor side with respect to the girder surface side edge of the inner layer material (8), and the protruding edge (9c).
A standing piece (9e) bent at a right angle is continuously provided from both side standing portions (9d) bent obliquely upward to the inside of the room.

A girder (24) made of an angle member and an upper-floor furring strip (25) opening on the upper surface are horizontally mounted on a pillar (23) of the building, and a large number of girder walls (2) are placed on the furring strip (25). ) Is erected. The girder wall (2) is composed of a main body wall (2a) and an exterior wall (2b).

[0027] (27) is an inner rain presser, which is an inner rain presser on the outdoor side surface of the lower main body wall (2a) without the exterior wall (2b) of the girder wall (2) and the upper floor furrow (25). 27)
The intermediate part (27a) is supported. This inner rain presser (27) is made of a thin metal plate such as a galvanized steel plate,
A step portion (27b) is bent outward from the lower edge of the vertical middle portion (27a). A lower portion (27c) is bent downward at a right angle from an outdoor edge of the step portion (27b), and further, a lower edge portion (27d) is bent at a right angle from the lower edge of the lower portion (27c) to the outdoor side. This lower edge (27d)
A folded-back portion is formed on the outdoor side edge (27e), and an outdoor-side folded portion (27g) is provided on the upper edge of the upper edge portion (27f) continuous with the intermediate portion (27a).

The middle portion (27a) of the inner rain presser (27) is pressed from the outdoor side by a wood substrate, that is, the rain presser support member (28), and protrudes above the rain presser support member (28) from the upper edge portion (27f). Is supported and fixed to the outdoor side surface of the main body wall (2a) of the girder wall (2) by an appropriate means together with the upper edge portion (4a) of the rain presser (4) described later.

The rain presser support member (28) is fixed to the upper floor furrow (25) or the outdoor side surface of the main body wall (2a) by an appropriate means through the inner rain presser (27), and the roof surface layer portion ( 22) is provided on the indoor side. Extending stepped portion of the inner flashings (27) from the lower edge of (27b) is flashing support member (28) to the outdoor side, the digit surface of the backup material on the stepped portion (27b) (20 ₁₎ is supported There is. The backup material (20 ₁ ) is cut off at the girder surface side and is disposed outside the lower edge chamber of the rainfighting support member (28) to cover the girder surface side backup material (20 ₁ ). The roof material (6 ₁ ) on the side is cut at the girder surface side edge and rises from the middle, and the rising portion (6 c) is supported by the outdoor side surface of the rainfighting support member (28).

Lower edge (27d) of the inner rain presser (27)
Is supported on the upper surface of the end of the rafter (10) on the girder side, and is fixed to the rafter (10) by screws (29).

When the roof material (6) is a metal plate, the rain presser (4) is made of a metal plate having the same thickness and material as the roof material, and the upper edge (4a) to the step (4b). Is bent at a right angle to the outside of the room, and the upper part (4c) is bent at a right angle from the outside edge of the step (4b) to the upper part (4c).
Lower side (4d) protruding diagonally downward from the lower edge to the outdoor side
The lower edge (4e) is folded back toward the room.

The upper edge portion (4a) of the rain presser (4) is inserted between the outdoor side folded-back portion (27g) and the upper edge portion (27f) of the inner rain presser (27), and the upper edge portion (4f) is inserted. (27f)
Of the outer wall of the girder wall (2) is fixed to the upper outer wall (25) or the outer wall surface of the main body wall (2a) of the girder wall (2) together with the upper edge part (27f). It is covered by the outside. By the step portion (4b) and the upper portion (4c) of the rain presser (4), the upper part of the rain presser support member (28),
The rising portion (6c) of the roof material (6 ₁ ) on the girder side is covered from the outdoor side. Also, the lower edge (4
e) is brought into contact with the upper surface of the roof material (6 ₁ ) on the girder side, and this abutting portion is arranged on the girder surface side of the lower portion (27c) of the inner rain presser (27).

In FIG. 1, (30) is a base member (7).
It is a building beam that supports and fixes the building.

The girder surface wall joint (3) of the first embodiment constructed as described above has the seam of the rain presser (4) and the lower edge (4e) of the rain presser (4). roofing material (6 ₁₎ of water, such as rain water and the like contact portion between the upper surface of the enters the interior side of the flashing (4), a part of the intruded water and flashing the support member (28) digit side The rising part (6) of the roofing material (6 ₁ )
c), it may be guided to the lower part of the roof surface layer part (22) from between the intermediate part (27a) of the inner rain presser (27).

However, the water guided below the roof surface layer portion (22) flows along the stepped portion (27b) and the lower portion (27c) of the inner rain retainer (27), and the water leakage prevention plate (9) is prevented. Can be received on the top surface.

Further, even if water such as rainwater flows down on the indoor side surface of the girder wall (2) due to cracks in the girder wall (2), the water that flows down is the upper edge (27) of the inner rain presser (27).
f) It is received on the upper surface of the girder side edge portion (9b) of the water leakage prevention plate (9) through the indoor side surface of the intermediate portion (27a).

Then, the water received on the upper surface of the water leakage prevention plate (9) flows down due to the gradient, and falls out of the roof from the eaves of the drainage space (21).

FIG. 3, FIG. 4 and FIG.
It is a vertical side view of the 3rd and 4th example, and the same numerals as Drawing 1 in Drawing 3, Drawing 4, and Drawing 5 show a corresponding portion.

As shown in FIG. 3, the girder wall fitting portion of the second embodiment uses, as a rain-pressing support member (28), a wall-discarding valley metal fitting made of a bent metal plate instead of a wooden base. Has been. The rain presser support member (28) has a vertical portion (2
8a), the vertical portion (28a) is bent downward from the upper end of the vertical portion (28a) to the outside, and the hanging portion support portion (28b) is bent downward from the bent end. An inverted U-shaped roof member support portion (28c) protruding from the central portion in the up-down direction to the outdoor side, a step portion (28d) bent from the lower end of the vertical portion (28a) to the outdoor side, and a step portion (28d). ) Is integrally formed with the rafter support portion (28f) bent downward from the lower end of the lower part (28e) bent downward from the outdoor end.

The vertical portion (28) of the rain presser support member (28)
a) is fixed with screws to the upper floor furring strip (25) together with the middle portion (27a) of the inner rain presser (27) having a substantially L-shaped cross section, and the rafter support portion (28f) has the inner rain presser (27f). ) Screw (29) to the rafter (10) together with the lower edge (27d).
Is fixed by. In addition, the rain presser support member (2
On the step portion (28c) of 8), the girder side edge of the girder side backup material (20 ₁ ) is supported, and the roof material supporting portion (2
On the outdoor side surface of 8c), the rising portion (6c) of the roof material (6 ₁ ) on the girder side is fixed with screws. The rising portion (6c) has a folded portion formed on the outside of the upper edge of the room. Rain retainer support part (28) of the rain retainer support member (28)
b) is an upper part (4c) and a step part (4) of the rain presser (4).
It is covered with b) from the outside of the room, and the upper part (4c) is fixed to the hanging part of the rain presser support part (28b) with screws.

The rain presser supporting members (28) are arranged at a plurality of suitable intervals along the longitudinal direction of the girder wall (2).

Further, it is surrounded by the lower surface of the exterior wall (2b) of the girder wall (2), the outdoor side surface of the upper edge (4a) of the rain presser (4) and the step (4b) of the rain presser (4). The joint portion is filled with the sealing material (31).

The structure of the second embodiment other than that described above is the same as that of the first embodiment.

As shown in FIG. 4, in the girder surface wall fitting portion of the third embodiment, as shown in FIG. 4, the inner rain presser (27) and the wall discarding valley metal fittings as the rain presser support member (28) are the same as those of the second embodiment. It is used. Vertical part (28) of the rain presser support member (28)
a) is a concave part (2c) of the girder wall (2) made of concrete.
It is supported by sandwiching the intermediate portion (27a) of the inner rain presser (27) on the outdoor side surface, and is anchor bolts and driving bolts (3).
It is fixed to the recess (2c) by 2) or the like.

A sealing material (3) is provided on the joints surrounded by the lower surface of the convex portion (2d) of the girder wall (2), the outdoor side surface of the upper edge portion (4a) of the rain presser (4) and the upper step portion (4b).
1) is filled.

The structure of the third embodiment other than that described above is the same as that of the second embodiment. In addition, in the third embodiment,
The portion of the girder wall (2) located below the rain-holding support member (28) is arranged further inside the support member (28) so that the girder surface side of the inner layer material (8) and the water leakage prevention plate (9). The edge may be projected to the indoor side of the rain presser support member (28).

As shown in FIG. 5, the girder surface wall joint of the fourth embodiment includes a large number of plywood plates (33) on the rafters (10).
A (backup material) is supported and fixed, and an asphalt-based waterproof material (34) is laid in series on the plywood (33).

On the plywood (33), a large number of roofing materials (6) made of tiles, natural slate, roof tiles, etc. are roofed via an asphalt-based waterproofing material (34), and the roofing material (6) has a plurality of materials. Each of them is fixed to the plywood (33) by a nail (35) or the like.

The upper edge portion (27f) of the inner rain presser (27) having a substantially L-shaped cross section is supported on the outer side surface of the upper floor furring edge (25) or the main body wall (2a) of the girder wall (2) to prevent rain. The upper edge (4a) of the presser foot (4) is superposed on the outdoor side of the upper edge (27f) of the inner rain presser (27), and the upper edge (4)
The outdoor side of a) is covered with the lower edge of the exterior wall (2b) of the girder wall (2).

The upper edge portion (27f) of the inner rain retainer (27),
The upper edge portion (4a) of the rain presser (4) and the attachment member (36) of the girder wall (2) are fastened together by screws to the furring strip (25). The exterior wall (2) of the girder wall (2)
b) It is preferable to fill a sealing material (not shown) between the lower edge and the upper edge (4a) of the rain presser (4).

On the outdoor side of the middle part (27a) of the inner rain presser (27), a rain presser support member (28) made of a wood base is arranged via the rising part (34a) of the asphalt waterproof material (34). The rain presser support member (28) is supported on the girder side roof material (6). The rain-pressing support member (28) is formed in a rectangular cross-section with a long indoor / outdoor direction, and the outdoor side surface of the rain-pressing support member (28) has an upper portion (4c) of the rain presser (4) such as a nail. Is fixed by.

The structure of the fourth embodiment other than that described above is the same as that of the first embodiment.

In the present invention, the means for fixing the inner layer material on the base member comprising the purlin is not necessarily limited to the fixing device shown in FIG. 2 and can be changed as appropriate, the base member is not necessarily limited to the purlin, and the ALC It can be changed to panels, concrete frames, etc.

In the present invention, roofing materials, especially tiles,
The means for fixing the roofing material made of natural slate, roof tiles, etc. to the rafters is not necessarily limited to the nailing described above, such as locking the roof tiles on the rafters fixed on the rafters, and can be appropriately changed.

In the present invention, the water leakage prevention plate is preferably provided with a plurality of reinforcing ridges extending in the eaves direction at appropriate intervals.

[0056]

EFFECTS OF THE INVENTION In the girder wall fitting section according to the present invention, the roof is provided with a space below a roof material such as a metal plate, a tile, a natural slate, etc. through a space portion which does not cause a capillary phenomenon for drainage. Having a water leakage prevention upper plate arranged on the member, the lower edge of the rain presser of the girder surface wall fitting section is brought into contact with the upper surface of the roof material of the roof on the lower floor, and this contact is made. The upper part of the rain presser is supported by the girder wall on the upper floor, and the inner rain presser is arranged on the indoor side of the rain presser, and the lower edge of the inner rain presser is a water leakage prevention plate for the roof on the lower floor. And the roof surface layer, and the upper edge of the inner rain presser was supported by the girder wall, so that the following effects can be obtained.

That is, in the girder surface wall joint of the roof of the present invention, even if water such as rainwater enters the inside of the rain presser due to a construction error, this water will flow along the outside surface of the inner rain presser. Run down on the water leakage prevention plate.

Since the water leakage prevention plate has a slope that rises toward the girder side edge (indoor side edge), the water that has flowed down leaks to the girder surface side from the lower edge of the inner rain presser. It does not flow on the upper surface of the prevention plate, flows down due to the gradient, and is discharged to the outside of the roof from the eave tip of the space part where the capillary phenomenon for drainage does not occur.

Therefore, even if water such as rainwater enters the indoor side of the rain presser, it is possible to reliably prevent the water from leaking to the indoor side of the girder wall coupling portion.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the rafter fixing portion of the first embodiment.

FIG. 3 is a vertical sectional side view of a second embodiment.

FIG. 4 is a vertical sectional side view of a third embodiment.

FIG. 5 is a vertical sectional side view of a fourth embodiment.

FIG. 6 is a schematic perspective view showing a building having a roof girder wall connection section of a conventional example.

[Explanation of symbols]

(1) Roof (2) Girder surface wall (2a) Main body wall (2b) Exterior wall (2c) Recessed portion (2d) Convex portion (3) Girder surface wall mounting portion (4) Rain retainer (4a) Upper edge portion (4b) ) Step
(4c) the upper part (4d) lower part (4e) the lower edge (6) roofing material ₍₆₁₎ digit side of the roofing material (6c) rising portion (7) base member (8) the inner layer member (9 ) water Mori prevention plate (9b) digits plane side (10) rafters (11) rafters fixing device (20) backup material (20 ₁₎ digit side of the backup material (21) space (22) the roof surface portion (23 ) Pillar (25) Upper floor furring (27) Inner rain presser (27a) Middle section (27b) Step section
(27c) Lower part (27d) Lower edge part (27e) Outdoor edge
(27f) Upper edge portion (28) Rain-pressing support member (31) Sealing material (33) Plywood (backup material) (34) Asphalt-based waterproof material

Claims (4)

[Claims] 1. A roof girder wall fitting portion is housed in the roof, and the roof is provided with a space below the roof material such as a metal plate, a tile, or a natural slate that does not cause a capillary phenomenon for drainage. , A water leakage prevention plate disposed on the base member, and, of the girder surface wall joints stored, the lower edge of the rain presser is brought into contact with the upper surface of the roof material of the roof on the lower floor and The part above the contact part is supported by the girder wall on the upper floor, and the inner rain presser is installed on the indoor side of the rain presser, and the lower edge of this inner rain presser prevents water leakage from the roof on the lower floor. A girder surface wall fitting part for a roof, characterized in that it is arranged between the board and the roof surface part, and the upper edge of the inner rain presser is supported by the girder surface wall. 2. The girder face wall joint portion of the roof according to claim 1, wherein the inner rain presser is supported and fixed on the girder side end of the rafter whose lower edge is fixed on the base member. Pay. 3. The girder side edge of the water leakage prevention plate is extended to the girder side edge of the roof surface layer portion mainly composed of a roof material and a backup material arranged below the roof material. The girder face wall fitting part of the roof according to claim 1 or 2. 4. The inner rain presser has an intermediate portion extending downward between the girder wall and the roof surface portion below the upper edge portion,
4. The girder surface wall fitting portion of the roof according to claim 1, wherein the lower edge portion extends to the outside of the lower edge room of the middle portion.