JP5965631B2 - Roof structure and roof construction method - Google Patents

Description

  The present invention relates to a roof structure such as a residential building and a roof construction method.

  In order to prevent the penetration of moisture such as rain and snow, as a waterproofing sheet construction method for waterproofing and insulating structures on the rooftops of buildings and balcony floors of houses, etc. There is known a method of laying a waterproof sheet.

  As this type of roof structure, for example, a roof structure as shown in Patent Document 1 is known. In the roof structure of Patent Document 1, a heat insulating plate is laid on the roof frame, and a gradient plate is provided above the heat insulating plate to form a water gradient. The water gradient is formed in a downward slope toward the parapet (the rising portion of the outer wall panel). In addition, a steel plate that forms a drainage groove along the rise of the parapet is provided, and precipitation on the roof flows down along the water gradient of the gradient plate, reaches the drainage groove, and drainage provided in the drainage groove. It will be drained from the roof by a pipe.

JP 2010-43409 A

  However, in the configuration according to Patent Document 1, the panel-like heat insulating plate extends from the base end portion of the rising portion of the outer wall panel to the lower side of the gradient plate. In order to change the depth of the drainage groove provided along the rising portion of the outer wall panel, it is necessary to reduce the thickness of the heat insulating plate over the entire surface of the roof, which may reduce the heat insulating property of the roof.

  Then, an object of this invention is to provide the roof structure which can change the height of a drain groove part easily.

A roof structure according to the present invention includes a flat roof surface forming portion, a roof frame portion having a rising portion standing around the roof surface forming portion, a waterproof layer covering at least the roof surface forming portion, and a roof surface An intermediate layer that is provided between the forming portion and the waterproof layer and is formed of a foamable resin and adjusts a distance between the roof surface forming portion and the waterproof layer; and a drainage groove portion that is formed along the rising portion. In the roof structure, the intermediate layer is laid on the roof surface forming portion in a state surrounded by the outer peripheral edge portion and the outer peripheral edge portion provided on the roof surface forming portion along the rising portion of the roof frame portion. comprising a main body portion that, the, the body portion is riveted to the roof surface forming section, an outer peripheral edge portion is laid placed between the rising portion and the body portion, each other and the drainage groove and the outer peripheral edge portion It is characterized by not being fixed .

  According to the roof structure according to the present invention, the main body portion of the intermediate layer is attached to the roof surface forming portion, while the outer peripheral edge portion of the intermediate layer is only laid on the roof surface forming portion. The edges are cut off from each other. As a result, the thickness and shape of the outer peripheral edge can be set independently from the main body of the intermediate layer. As a result, the drainage groove having an arbitrary depth is formed by arbitrarily adjusting the height of the outer peripheral edge. Will be able to. In addition, the outer peripheral edge can be removed while the intermediate layer main body is placed on the roof surface forming portion, and the outer peripheral edge can be easily replaced.

  Further, in the roof structure according to the present invention, the main body portion includes a heat insulating layer formed by a flat plate panel, a gradient forming layer formed by a gradient panel provided with a water gradient on the upper surface of the flat panel panel, It is preferable to provide. According to this configuration, since the gradient forming layer can take a water gradient by the gradient panel, the heat insulating layer is formed by the flat panel, so that the heat insulating property of the heat insulating layer is in the roof surface forming portion below the main body portion. It can be set uniformly, and a predetermined water gradient can be formed while ensuring heat insulation over substantially the entire roof surface.

  Moreover, in the roof structure which concerns on this invention, it is preferable that a gradient formation layer is provided on the roof surface formation part of a roof housing | casing part, and a heat insulation layer is provided on the gradient formation layer. According to this structure, the gradient forming layer is covered with the heat insulating layer. When excessive heat due to solar radiation or the like is transmitted to the gradient forming layer, the gradient forming layer may be deformed and affect the smoothness of the roof surface. On the other hand, by covering and protecting the gradient forming layer with the heat insulating layer, it is possible to suppress excessive heat from being transferred to the gradient forming layer.

  Moreover, in the roof structure which concerns on this invention, it is preferable that an outer periphery part is comprised as a heat insulation layer formed with a flat panel, and is connected with the heat insulation layer of a main-body part. According to this structure, since the outer peripheral edge is also formed as a heat insulating layer and connected to the heat insulating layer of the main body, a heat insulating line is formed over the entire roof surface, and the heat insulating property of the roof surface forming portion is improved. It will be even higher.

The roof construction method according to the present invention includes a step of forming a roof body portion having a flat roof surface forming portion and a rising portion erected around the roof surface forming portion, and an intermediate layer on the roof surface forming portion. Providing a water gradient and a step of laying a waterproof layer on the intermediate layer, and in the step of forming the water gradient, the outer peripheral edge portion is laid along the rising portion of the roof frame portion. Then, by forming a main body portion having a downwardly inclined water gradient toward the outer peripheral edge portion in a space surrounded by the outer peripheral edge portion, a drainage groove portion that is not fixed to the outer peripheral edge portion is formed. It is characterized by.

  According to the roof construction method according to the present invention, the main body portion of the intermediate layer is attached to the roof surface forming portion, while the outer peripheral edge portion of the intermediate layer is only laid on the roof surface forming portion. Are cut off from each other. As a result, the thickness and shape of the outer peripheral edge can be set independently from the main body of the intermediate layer. As a result, the drainage groove having an arbitrary depth is formed by arbitrarily adjusting the height of the outer peripheral edge. Will be able to. In addition, the outer peripheral edge can be removed while the intermediate layer main body is placed on the roof surface forming portion, and the outer peripheral edge can be easily replaced.

  According to the present invention, the height of the drainage groove can be easily changed.

It is sectional drawing which shows the roof structure which concerns on embodiment of this invention. It is a figure which shows the procedure of the roof construction method which concerns on embodiment of this invention. It is a figure which shows the procedure of the roof construction method which concerns on embodiment of this invention. It is sectional drawing which shows the conventional roof structure. It is sectional drawing which shows the roof structure which concerns on the modification of this invention.

  FIG. 1 is a cross-sectional view showing a roof structure according to an embodiment of the present invention. The roof structure 1 is applied to a rooftop portion provided with a parapet in a building 100 such as a house. The roof structure 1 includes a roof housing part 2 constituting a housing near the roof in the building 100, a waterproof layer 3 covering the roof surface forming part 10 of the roof housing part 2, and between the roof surface forming part 10 and the waterproof layer 3. Are provided with an intermediate layer 4 for adjusting the distance between the two and a drainage groove 6 for draining the roof.

  The roof housing part 2 includes a roof surface forming part 10 and a rising part 11. The roof surface forming unit 10 forms a planar roof surface 10 a in a region inside the rising portion 11 of the building 100. The roof surface forming portion 10 is configured by a roof panel 12 laid on the upper end of the building 100 and a mortar 13 that fills a gap near the outer edge of the roof panel 12. The roof panel 12 is formed by laying a flat lightweight aerated concrete (ALC) panel. Since the ALC panel is lightweight and has high heat insulation performance, it can be preferably used as an outer wall material. The roof panel 12 is laid on a beam 14 erected on the upper end of the housing of the building 100. Since a space is formed between the outer edge of the roof panel 12 and the rising portion 11, the mortar 13 is filled in the space. The upper surface of the mortar 13 is set to a height that coincides with the upper surface of the roof panel 12, and the roof surface 10a is formed by these upper surfaces.

  The rising portion 11 is configured by raising the outer wall of the building 100 to a position higher than the roof surface 10a. The rising portion 11 is formed so as to surround the outer periphery of the building 100, that is, so as to surround the entire periphery of the roof surface forming portion 10 (see, for example, FIGS. 2 and 3). Specifically, the rising portion 11 is configured by the outer wall panel 16 of the building 100 that has risen to a position higher than the roof surface 10a. The vicinity of the upper end of the outer wall panel 16 is supported by a base metal piece 17. The base metal 17 includes a vertical portion 17a that covers the inner surface near the upper end of the outer wall panel 16, a joint portion 17b that is bent inward from the lower end of the vertical portion 17a and is bolted to the upper flange of the beam 14, and a vertical portion. An upper end covering portion 17c that bends from the upper end of the portion 17a to the outside of the building 100 and covers the upper end surface of the outer wall panel 16. The upper end portion of the rising portion 11 is covered with a cap 15.

  The intermediate layer 4 is provided between the roof surface forming portion 10 and the waterproof layer 3 and is formed of a foamable resin. The intermediate layer 4 is laid on the roof surface forming portion 10 in a state surrounded by the outer peripheral edge portion 21 and an outer peripheral edge portion 21 provided on the roof surface forming portion 10 along the rising portion 11 of the roof frame portion 2. And a main body portion 22.

  The main body 22 includes a heat insulating layer 24 formed by a flat plate panel 23 and a gradient forming layer 27 formed by a gradient panel 26 having a water gradient on the upper surface of the flat panel. The gradient forming layer 27 is provided on the roof surface forming portion 10 of the roof frame portion 2, and the heat insulating layer 24 is provided on the gradient forming layer 27. An incombustible plate 28 is laid on the heat insulating layer 24. The outer peripheral edge of the heat insulating layer 24 of the main body part 22 and the outer peripheral edge of the gradient forming layer 27 coincide with each other and form the same surface, and constitute the small edge surface 22 a of the main body part 22. A space for disposing the outer peripheral edge 21 is formed between the small edge surface 22 a of the main body 22 and the rising portion 11.

  The gradient panel 26 constituting the gradient forming layer 27 is formed by laying a plate material, which is mainly made of foamable resin, on the roof surface 10 a, that is, the upper surface of the roof panel 12. Further, the slope panel 26 is formed in a state where the upper surface is slightly inclined to about 1/100 to 1/200 with respect to the lower surface, and a water gradient is formed on the uppermost surface of the roof structure 1 by the inclination. It will be a thing. As a material that can be used as the gradient panel 26, an extruded polystyrene foam heat retaining plate can be used. The extruded polystyrene foam heat retaining plate has an advantage that a water gradient can be formed at a low cost in the roof structure 1 from the viewpoint of processability and cost. In addition, as the gradient panel 26, a bead method polystyrene foam or the like can be employed.

  The heat insulating layer 24 is laid on the upper surface of the gradient forming layer 27, that is, the gradient surface of the gradient panel 26 on which the gradient is formed. The heat insulating layer 24 is configured by overlapping two flat panels 23. Various materials can be adopted as the flat panel 23 constituting the heat insulating layer 24. As the flat panel 23, a heat insulating material made of a thermosetting resin can be used. Moreover, a phenol resin foam (phenol foam) is employable as a thermosetting resin. For example, Neoma (registered trademark, trademark holder: Asahi Kasei Construction Materials Co., Ltd., hereinafter referred to as Neoma or Neoma Foam) can be used as the heat insulating layer 24 mainly composed of such a phenol resin foam. In addition, the protective surface material is normally provided in the front and back of a phenol resin foam. Although it does not specifically limit as a material which comprises this protective surface material, For example, it is possible to use the nonwoven fabric which consists of synthetic fibers containing a polyester nonwoven fabric. Further, the thickness of the flat panel 23 of the heat insulating layer 24 is set at the manufacturing stage, and is standardized into a flat plate having a predetermined width and length and cut. That is, the width of the flat panel 23 can be set according to the module size set for the house. Further, the heat insulating layer 24 is not limited to two layers formed of a single material as described above, but a laminate of a plurality of flat panels 23 made of the material, a single layer, or a flat panel of different materials. Also included are those formed by laminating 23 as appropriate.

  The incombustible plate 28 is laid on the upper surface of the heat insulating layer 24, that is, the upper surface of the upper flat panel 23. The incombustible plate 28 has a function of preventing the intermediate layer 4 from burning. As the incombustible plate 28, an insulation board, a calcium silicate board, other hard wood cement board, a sizing board, or the like can be used.

  The outer peripheral edge 21 is configured as a heat insulating layer 32 formed by a flat panel 31. The heat insulating layer 32 of the outer peripheral edge portion 21 is connected to the heat insulating layer 24 of the main body portion 22. The small edge surface 22a of the main body 22 and the small edge surface 21a of the outer peripheral edge 21 are in contact with each other, so that the heat insulating layer 32 and the heat insulating layer 24 are in contact with each other without a gap. Further, the fore edge surface 21 b outside the outer peripheral edge portion 21 is in contact with the rising portion 11. Thereby, the whole area | region of the roof surface 10a can be covered with the heat insulation layer 32 and the heat insulation layer 24. FIG. The heat insulating layer 32 of the outer peripheral edge portion 21 is configured by overlapping two panels 31. As the flat panel 31, the same material and the same thickness as the flat panel 23 of the main body 22 may be used, but different materials and thicknesses may be used. The upper surface of the outer peripheral edge 21 is lower than the upper surface of the main body 22, and a step for forming the drainage groove 6 is formed.

  The main body portion 22 is attached to the roof surface forming portion 10. Specifically, the main body portion 22 is attached by the attachment member 34. The caulking member 34 passes through the drainage groove bottom plate 41, the incombustible plate 28, the flat panel 23, and the gradient panel 26 and extends to the roof panel 12 of the roof surface forming portion 10. Thereby, the main body portion 22 is attached to the roof surface forming portion 10. A disc-shaped member (not shown) is disposed between the head of the staking member 34 and the non-combustible plate 28. A screw or the like can be used as the adhesive member 34. The outer peripheral edge portion 21 is laid between the rising portion 11 and the main body portion 22. The outer peripheral edge portion 21 is placed on the roof surface 10 a of the roof surface forming portion 10 and is not attached like the main body portion 22. The facet surface 21a and the facet surface 22a are separated from each other and are not fixed to each other. That is, the outer peripheral edge portion 21 is in a state where the edge is cut off from the main body portion 22 that is attached to the roof surface forming portion 10 and is not fixed to each other.

  The waterproof layer 3 is formed to be stretched on the upper surface of the incombustible plate 28. The material capable of forming the waterproof layer 3 is preferably a vinyl chloride resin sheet, but in addition, a flat roof slate, a synthetic resin emulsion-based finishing coating material, a polyethylene sheet with a glass nonwoven fabric, a polyethylene sheet with a glass cloth, In addition, it is possible to employ a sheet in which any one of these sheets is laminated. The waterproof layer 3 covers at least the roof surface forming part 10.

  The drain groove 6 is formed on the roof surface forming part 10 and along the rising part 11. The drain groove 6 is formed above the outer peripheral edge 21. The drain groove portion 6 is configured by covering the upper portion of the outer peripheral edge portion 21 with a drain groove bottom plate 41. The drain groove bottom plate 41 includes an inclined portion 41a inclined downward from the main body portion 22a toward the rising portion 11, a connection portion 41b connected to the main body portion 22a, and a vertical portion 41c that contacts the vertical portion 17a of the base metal fitting 17. And an upper end cover portion 41 d that covers the upper end cover portion 17 c of the base metal member 17. The drain groove bottom plate 41 can be formed of a steel plate. The surface of the drainage groove bottom plate 41 may be coated with a vinyl chloride resin by laminating or the like. Further, the waterproof sheet constituting the waterproof layer 3 may extend to the inclined portion 41a, the vertical portion 41c, and the upper end cover portion 41d of the drain groove bottom plate 41.

  Next, the roof construction method according to the present embodiment will be described with reference to FIGS. 2 and 3 are views showing the procedure of the roof construction method according to the present embodiment, and are views of the roof of the building 100 as viewed from above.

  First, the step of forming the roof housing part 2 including the flat roof surface forming part 10 and the rising part 11 standing around the roof surface forming part 10 is executed. Next, the step of providing the intermediate layer 4 on the roof surface forming portion 10 to form a water gradient is executed.

  In the step of forming the water gradient, first, the outer peripheral edge portion 21 is laid along the rising portion 11 of the roof frame portion 2. Next, the main body 22 having a downwardly inclined water gradient is laid in the space surrounded by the outer peripheral edge 21 toward the outer peripheral edge 21.

  Specifically, as shown in FIG. 2A, the outer peripheral edge along the rising part 11 is formed by laying a panel 31 on each side of the outer peripheral edge of the roof surface forming part 10 to form a heat insulating layer 32. Part 21 is formed.

  Further, as shown in FIG. 2B, a gradient forming layer 27 is configured by laying a gradient panel 26 in a portion surrounded by the outer peripheral edge portion 21 of the roof surface forming portion 10. The gradient panel 26 is divided into a plurality of pieces, and a desired gradient pattern is formed by a combination of the pieces. In the present embodiment, the portions of the lines L1, L2, L3, L4, and L5 are ridges that form a mountain upward. As a result, a portion surrounded by the lines L1 and L2 forms the same plane so as to be inclined downward toward the outer peripheral edge 21 (on the left side). A portion surrounded by the lines L3 and L4 forms the same plane that is inclined downward toward the outer peripheral edge 21 (on the right side). The portions surrounded by the lines L1, L3, and L5 form the same plane that is inclined downward toward the outer peripheral edge 21 (on the upper side). The portions surrounded by the lines L2, L4, and L5 form the same plane that is inclined downward toward the outer peripheral edge portion 21 (on the lower side).

  Next, as shown in FIG. 3A, the heat insulating layer 24 is configured by laying the flat panel 23 on the upper surface of the gradient forming layer 27 so as to cover the entire surface of the gradient forming layer 27. The flat panel 23 is divided into a plurality of pieces, and is laid so that a gradient corresponding to the gradient of the gradient forming layer 27 is formed. Thereby, the main-body part 22 is formed. When the main body portion 22 is formed, a non-combustible plate 28 is laid on the upper surface of the gradient forming layer 27 so as to cover the entire surface of the heat insulating layer 24 as shown in FIG. The intermediate layer 4 is configured as described above.

  After forming the intermediate layer 4, a step of forming the drain groove portion 6 along the rising portion 11 is executed. Next, the step of attaching the drainage groove 6 and the intermediate layer 4 to the roof surface forming part 10 is executed. Thereafter, the step of laying the waterproof layer 3 on the intermediate layer 4 is executed. As described above, the roof structure 1 is completed.

  Next, the operation and effect of the roof structure 1 and the roof construction method according to the present embodiment will be described.

  First, a conventional roof structure PA will be described with reference to FIG. 4 showing a conventional roof structure. In the conventional roof structure PA, the flat panel 23 constituting the heat insulating layer 24 extends to the rising portion 11, and is laid on the roof surface 10 a so as to cover substantially the entire area of the roof surface forming portion 10. On the heat insulation layer 24, a gradient forming layer 27 is laid by a gradient panel 26. In this roof structure PA, the flat panel 23 is united by the main-body part 22 and the outer periphery part 21, and the edge is not cut | disconnected like the roof structure 1 which concerns on this embodiment. In such a roof structure PA, in order to change the depth of the drainage groove 6, it is necessary to reduce the thickness of the flat panel 23 over the entire roof including the main body 22 as well as the outer peripheral edge 21. There is a risk of lowering the heat insulation property.

  On the other hand, in the roof structure 1 according to the present embodiment, the main body portion 22 is attached to the roof surface forming portion 10, and the outer peripheral edge portion 21 is laid between the rising portion 11 and the main body portion 22. According to such a configuration, the main body portion 22 of the intermediate layer 4 is attached to the roof surface forming portion 10, while the outer peripheral edge portion 21 of the intermediate layer 4 is only laid on the roof surface forming portion 10. Therefore, they are in a state where the edges are cut off from each other. As a result, the thickness and shape of the outer peripheral edge 21 can be set independently of the main body 22 of the intermediate layer 4, and as a result, the height of the outer peripheral edge 21 can be arbitrarily adjusted to drain water having an arbitrary depth. The groove 6 can be formed. Further, the outer peripheral edge 21 can be removed while the main body portion 22 of the intermediate layer 4 is placed on the roof surface forming portion 10, and the outer peripheral edge 21 can be easily replaced. Yes.

  Further, in the conventional roof structure PA, the two layers of the heat insulating layer 24 and the gradient forming layer 27 are attached together (because the drainage groove bottom plate 41 exists), so that the flat panel 23 in the vicinity of the outer peripheral edge portion 21. Will contact the rising portion 11 without being attached. In this configuration, when a vertical movement such as an earthquake is applied, the attached portion moves up and down integrally with the roof surface forming portion 10, whereas the protruding portion protrudes from the attached portion. The vicinity of the outer peripheral edge portion 21 has a free end shape as viewed from the attachment portion, so that the displacement becomes large. On the other hand, if the tip portion is in close contact with the rising portion 11 as the outer wall, the movement of the rising portion 11 follows. As a result, unexpected displacement may occur. On the other hand, since the elasticity (out-of-plane deformation) of the flat panel 23 is not so large, the flat panel 23 may be cracked as a result. Furthermore, when a crack occurs, the entire flat plate panel 23 needs to be replaced, and there is a problem that the repair is remarkably troublesome.

  On the other hand, according to the roof structure 1 according to the present embodiment, the main body portion 22 of the intermediate layer 4 is attached to the roof surface forming portion 10, but the outer peripheral edge portion 21 is only laid on the roof surface forming portion 10. Therefore, the edges are cut off from each other, and there is no possibility that the load from the main body 22 is transmitted to the outer peripheral edge 21. Therefore, even if the vertical movement such as an earthquake is transmitted to the roof surface forming portion 10, the main body portion 22 moves up and down integrally with the roof surface forming portion 10, while a load is transmitted to the outer peripheral edge portion 21. The outer peripheral edge 21 and the main body 22 are only slid with each other on the small facets 21a and 22a, and the cracking of the outer peripheral edge 21 is suppressed as much as possible. Even if a crack or the like occurs in the outer peripheral edge 21, only the outer peripheral edge 21 that is independent from the main body 22 needs to be replaced, so that the repair is remarkably facilitated.

  In the roof structure 1 according to this embodiment, the main body 22 includes a heat insulating layer 24 formed by a flat plate panel 23 and a gradient forming layer 27 formed by a gradient panel 26. According to this configuration, the gradient forming layer 27 can take a water gradient by the gradient panel 26, while the heat insulating layer 24 is formed by the flat panel 23 so that the heat insulating property of the heat insulating layer 24 is the roof under the main body 10. The surface forming portion 10 can be set uniformly, and a predetermined water gradient can be formed while ensuring heat insulation over the entire roof surface 10a.

  Further, in the roof structure 1 according to the present embodiment, the gradient forming layer 27 is provided on the roof surface forming portion 10 of the roof frame portion 2, and the heat insulating layer 24 is provided on the gradient forming layer 27. According to this structure, the gradient forming layer 27 is covered with the heat insulating layer 24. When excessive heat due to solar radiation or the like is transmitted to the gradient forming layer 27, the gradient forming layer 27 may be deformed and affect the smoothness of the upper surface of the roof. On the other hand, by covering and protecting the gradient forming layer 27 with the heat insulating layer 24, it is possible to prevent excessive heat from being transferred to the gradient forming layer 27.

  In the roof structure 1 according to the present embodiment, the outer peripheral edge 21 is configured as a heat insulating layer 32 formed by a flat panel 31 and is connected to the heat insulating layer 24 of the main body 22. According to this structure, since the outer peripheral edge portion 21 is also formed as the heat insulating layer 32 and connected to the heat insulating layer 24 of the main body portion 22, a heat insulating line is formed over the entire roof surface 10a, and roof surface formation is performed. The thermal bridge due to the exposure of the portion 10 is suppressed, and the heat insulating property of the roof surface forming portion 10 is further enhanced.

  According to the roof construction method according to the present embodiment, the main body portion 22 of the intermediate layer 4 is attached to the roof surface forming portion 10, while the outer peripheral edge portion 21 of the intermediate layer 4 is laid on the roof surface forming portion 10. Therefore, they are in a state where the edges are cut off from each other. As a result, the thickness and shape of the outer peripheral edge 21 can be set independently of the main body 22 of the intermediate layer 4, and as a result, the height of the outer peripheral edge 21 can be arbitrarily adjusted to drain water having an arbitrary depth. A groove part can be formed. Further, the outer peripheral edge 21 can be removed while the main body portion 22 of the intermediate layer 4 is placed on the roof surface forming portion 10, and the outer peripheral edge 21 can be easily replaced. Yes.

  The present invention is not limited to the embodiment described above.

  For example, you may employ | adopt the roof structure 201 as shown in FIG. In the roof structure 201, the heat insulating layer 24 is laid on the roof surface 10a, and the gradient forming layer 27 is laid thereon. The outer peripheral edge 21 and the main body 22 are in a state where the edges are cut.

  Since the outer peripheral edge 21 is independent from the main body 22, it can be set to a free shape and size regardless of the flat panel 23 of the main body 22. Therefore, you may make the heat insulation layer 32 of the outer periphery part 21 into the shape which fills the part shown, for example by the dashed-two dotted line SP of FIG. In this case, a separate member that fills the SP may be disposed, or the upper panel 31 may be raised upward to fill the SP. Moreover, although the two panels 31 are used in the outer periphery part 21, the panel in which both the panels 31 were formed integrally may be used. Other shapes / sizes may be set. The same applies to the outer peripheral edge 21 in FIG.

  DESCRIPTION OF SYMBOLS 1,201 ... Roof structure, 2 ... Roof frame part, 3 ... Waterproof layer, 4 ... Middle layer, 6 ... Drainage groove part, 10 ... Roof surface formation part, 11 ... Rising part, 21 ... Outer peripheral edge part, 22 ... Main-body part 23 ... Flat panel, 24 ... Heat insulation layer, 26 ... Gradient panel, 27 ... Gradient forming layer, 31 ... Panel, 32 ... Thermal insulation layer.

Claims (5)

A roof housing part having a flat roof surface forming part and a rising part standing around the roof surface forming part;
A waterproof layer covering at least the roof surface forming portion;
An intermediate layer that is provided between the roof surface forming portion and the waterproof layer and is formed of a foamable resin to adjust a distance between the roof surface forming portion and the waterproof layer;
A drainage groove formed along the rising portion, and a roof structure comprising:
The intermediate layer is
An outer peripheral edge provided on the roof surface forming part along the rising part of the roof frame part;
A body part laid on the roof surface forming part in a state surrounded by the outer peripheral edge part,
The main body portion is attached to the roof surface forming portion, and the outer peripheral edge portion is laid between the rising portion and the main body portion ,
The drainage groove and the outer peripheral edge are not fixed to each other .   The main body includes a heat insulating layer formed by a flat plate panel and a gradient forming layer formed by a gradient panel provided with a water gradient on the upper surface of the flat panel. The roof structure according to claim 1. The gradient forming layer is provided on the roof surface forming part of the roof frame part,
The roof structure according to claim 2, wherein the heat insulating layer is provided on the gradient forming layer.   The roof structure according to claim 2, wherein the outer peripheral edge is configured as a heat insulating layer formed by a flat panel and is connected to the heat insulating layer of the main body. Forming a flat roof surface forming portion, and a roof frame portion including a rising portion standing around the roof surface forming portion;
Providing a middle layer on the roof surface forming portion to form a water gradient;
Laying a waterproof layer on the intermediate layer,
In the step of forming the water gradient,
Laying the outer peripheral edge along the rising part of the roof skeleton part,
Forming a drainage groove portion that is not fixed to the outer peripheral edge portion by laying a body portion having a downwardly inclined water gradient toward the outer peripheral edge portion in a space surrounded by the outer peripheral edge portion. A roof construction method characterized by

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