Waterproof and insulated roof structure and its construction method

Abstract

To provide a waterproof thermal insulation structure 10 of a roof which is excellent not only in waterproofness but also in thermal insulation property and can be constructed at low cost and significantly easily, and a construction method of the same.SOLUTION: A waterproof thermal insulation structure 10 of a roof is provided between a roofing material 5 and a roof substrate material 4 of a structure and it comprises a first waterproof layer 1 formed on the roof substrate material 4 with a plurality of band-like first roofing sheets (11a, 11b) arranged in line and laid in a state where their lateral edges are overlapped each other and a second waterproof layer 2 formed on the first waterproof layer 1 with a plurality of band-like second roofing sheets (21a, 21b) arranged in line and laid in a state where their lateral edges are overlapped each other. The laying direction of the second roofing sheet and the laying direction of each of the first roofing sheet are orthogonal to each other, and thermal insulation space parts (13, 24) with a step of the lateral edge of each of the roofing sheet as a starting point are formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waterproof and insulating roof structure and a construction method thereof, and more particularly to a waterproof and insulating roof structure that is provided between the roofing material and the roof underlayment of a building and has excellent waterproofing and insulating properties, and a construction method thereof. [Background technology]

[0002] In the past, in buildings such as ordinary houses, it was common to form a waterproof layer to prevent roof leaks by laying various roofing sheets, such as asphalt felt, asphalt roofing, and adhesive asphalt roofing, between roofing materials such as roof tiles, slate, and metal sheets and roof underlayment materials such as sheathing boards and sheathing boards. In this way, the roofing materials provide primary waterproofing for the roof, and the roofing sheets provide secondary waterproofing for the roof.

[0003] However, although this roofing sheet has excellent waterproofing properties, it does not have sufficient insulating properties itself, and for example, in winter, cold air from outside can cause condensation on the underside of the roofing sheet, which can cause the roof underlayment to corrode.

[0004] Therefore, to date, roof insulation structures have been proposed in which an insulating layer made of synthetic resin foam is formed between the roofing sheet and the roof underlayment, or between the roofing sheet and the roofing material (for example, Patent Document 1 below).

[0005] However, this heat insulating structure has drawbacks in that it requires the installation of synthetic resin foam, which increases costs and also requires time and effort for construction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-222985 Summary of the Invention [Problem to be solved by the invention]

[0007] To provide a waterproof and heat-insulating roof structure and a construction method thereof, which has been made in view of the above-mentioned drawbacks of conventional roof heat-insulating structures and is excellent not only in waterproofness but also in heat-insulating properties, and which can be constructed very easily at low cost. [Means for solving the problem]

[0008] The present invention is a waterproof and insulating roof structure provided between a roofing material and a roof underlayment of a building, a first waterproof layer formed on the roof underlayment and consisting of a plurality of strip-shaped first roofing sheets laid in parallel with their side edges overlapping one another; and a second waterproof layer formed on the first waterproof layer and consisting of a plurality of strip-shaped second roofing sheets laid in parallel with their side edges overlapping one another. a third waterproof layer formed on the second waterproof layer and consisting of a plurality of strip-shaped third roofing sheets laid in parallel with their side edges overlapping one another; Equipped with A first insulation space (13) is formed between the first waterproof layer and the roof underlayment, the first insulation space (13) originating from a step formed at the side edge of each of the first roofing sheets, The laying direction of each second roofing sheet of the second waterproof layer is perpendicular to the laying direction of each first roofing sheet of the first waterproof layer, Between the second waterproof layer and the first waterproof layer, the side edge end portions of each of the second roofing sheets a second heat insulating space portion (23) starting from a step occurring in the The step occurring at the side edge of each of the first roofing sheets is used as a starting point. A third insulating space portion (24) is formed And, The laying direction of each of the third roofing sheets of the third waterproof layer and the laying direction of each of the second roofing sheets of the second waterproof layer are perpendicular to each other, Between the third waterproof layer and the second waterproof layer, the side edge end portions of the third roofing sheets a fourth heat insulating space portion (33) starting from a step occurring at the The step occurring at the side edge end of each of the second roofing sheets is used as the starting point. A fifth heat insulating space (34) is formed And, The position of the overlapping portion (32) between the third roofing sheets of the third waterproof layer is made different from the position of the overlapping portion (12) between the first roofing sheets of the first waterproof layer, thereby shifting the positions of the fourth insulation space (33) formed along the overlapping portion (32) of the third waterproof layer and the first insulation space (13) formed along the overlapping portion (12) of the first waterproof layer. It is characterized by the following.

[0009] Further, the present invention provides a method for installing a roof structure in a manner that each of the first roofing sheets of the first waterproof layer is laid along a direction perpendicular to the slope direction of the roof, and each of the second roofing sheets of the second waterproof layer is laid along the slope direction of the roof. The third roofing sheets of the third waterproof layer are laid along a direction perpendicular to the slope direction of the roof. It is characterized by the following.

[0010] The present invention also provides the first roofing sheet. 、 the second roofing sheet and the third roofing sheet However, it is characterized by being made of asphalt felt.

[0011] The present invention is also characterized in that the roofing material is made of sheet metal.

[0012] The present invention also provides a construction method for a waterproof and insulating roof structure provided between a roofing material and a roof underlayment of a building, comprising: a first waterproof layer forming process for forming a first waterproof layer by laying a plurality of strip-shaped first roofing sheets in parallel on the roof underlayment with their side edges overlapping each other; and a second waterproof layer forming process for forming a second waterproof layer by laying a plurality of strip-shaped second roofing sheets in parallel on the first waterproof layer with their side edges overlapping each other and so that the laying direction of each second roofing sheet is perpendicular to the laying direction of each first roofing sheet of the first waterproof layer. a third waterproof layer formation process in which a third waterproof layer is formed by laying a plurality of strip-shaped third roofing sheets on the second waterproof layer in parallel with each other with their side edges overlapping each other and so that the laying direction of each third roofing sheet is perpendicular to the laying direction of each second roofing sheet on the second waterproof layer; Equipped with In the first waterproof layer forming step, a first insulation space portion (13) is formed between the first waterproof layer and the roof underlayment, starting from a step occurring at the side edge end of each of the first roofing sheets; In the second waterproof layer forming step, the side edge end portions of the second roofing sheets are formed between the second waterproof layer and the first waterproof layer. a second heat insulating space portion (23) starting from a step occurring in the The step occurring at the side edge of each of the first roofing sheets is used as a starting point. A third heat insulating space portion (24) is formed, In the third waterproof layer forming step, Between the third waterproof layer and the second waterproof layer, a fourth insulation space portion (33) is formed starting from a step occurring at the side edge end of each of the third roofing sheets, and a fifth insulation space portion (34) is formed starting from a step occurring at the side edge end of each of the second roofing sheets, The position of the overlapping portion (32) between the third roofing sheets of the third waterproof layer is made different from the position of the overlapping portion (12) between the first roofing sheets of the first waterproof layer, thereby shifting the positions of the fourth insulation space (33) formed along the overlapping portion (32) of the third waterproof layer and the first insulation space (13) formed along the overlapping portion (12) of the first waterproof layer. It is characterized by the following. [Effects of the Invention]

[0013] According to the waterproof and insulating roof structure and construction method of the present invention, multiple waterproof layers consisting of multiple strip-shaped roofing sheets are formed, which provides excellent waterproofing and can reliably prevent leaks from the roof, and since insulating spaces are formed between these multiple waterproof layers, the structure also provides excellent insulating properties and can effectively prevent condensation caused by cold outside air during the winter.

[0014] Furthermore, the insulating space between these waterproof layers can be formed by utilizing the step caused by the thickness of the side edge of each roofing sheet, without using separate parts such as spacers, so construction is extremely easy and does not incur high costs. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view of a main part along the roof slope direction X, showing a roof structure to which the waterproof and heat-insulating roof structure of this embodiment is applied. [Figure 2] FIG. 2 is a cross-sectional view of a main part taken along the line S1-S1 in FIG. [Figure 3] FIG. 2 is a partial perspective view illustrating the first waterproof layer forming step of the construction method for the waterproof and insulating roof structure of this embodiment. [Figure 4] 10 is a cross-sectional view of a main part taken along the slope direction X of the roof, illustrating the first waterproof layer forming step. FIG. [Figure 5] FIG. 5 is a cross-sectional view of a main part taken along the line S2-S2 in FIG. 4. [Figure 6] FIG. 2 is a partial perspective view illustrating the second waterproof layer forming step of the construction method for the waterproof and insulating roof structure of this embodiment. [Figure 7] 10 is a cross-sectional view of a main part taken along a direction Y perpendicular to a slope direction X of the roof, illustrating the second waterproof layer forming step. FIG. [Figure 8] FIG. 8 is a cross-sectional view of a main part taken along the line S3-S3 in FIG. 7. [Figure 9] FIG. 2 is a partial perspective view illustrating the third waterproof layer forming step of the construction method for the waterproof and insulating roof structure of this embodiment. [Figure 10] 10 is a cross-sectional view of a main part taken along the slope direction X of the roof, illustrating the third waterproof layer forming step. FIG. [Figure 11] FIG. 11 is a cross-sectional view of a main part taken along the line S4-S4 in FIG. [Figure 12] FIG. 10 is a partial perspective view illustrating a modified embodiment of the waterproof and heat-insulating roof structure according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] As shown in Figures 1 and 2, the waterproof and insulating roof structure 10 of this embodiment is composed of a first waterproof layer 1 formed on a roof underlayment material 4 of a building, a second waterproof layer 2 formed on this first waterproof layer 1, and a third waterproof layer 3 formed on this second waterproof layer 2, and is provided between the roofing material 5 of the building and the roof underlayment material 4.

[0017] The first waterproof layer 1 is formed by laying a plurality of strip-shaped first roofing sheets 11 (11a, 11b) on the roof underlayment 4 in parallel with the side edges of each first roofing sheet 11 overlapping each other. Similarly, the second waterproof layer 2 is formed by laying a plurality of strip-shaped second roofing sheets 21 (21a, 21b) on the first waterproof layer 1 in parallel with the side edges of each second roofing sheet 21 overlapping each other, and the third waterproof layer 3 is formed by laying a plurality of strip-shaped third roofing sheets 31 (31a, 31b) on the second waterproof layer 2 in parallel with the side edges of each third roofing sheet 31 overlapping each other.

[0018] And, between the roof underlayment 4 of the building and the first waterproof layer 1, first A heat insulating space 13 is formed between the first waterproof layer 1 and the second waterproof layer 2. Second insulation space twenty three and the third insulation space 24 is formed between the second waterproof layer 2 and the third waterproof layer 3, Fourth insulation space 33 and the fifth insulation space 34 is formed between the third waterproof layer 3 and the roofing material 5, Sixth A heat insulating space 35 is formed.

[0019] The waterproof and insulating roof structure 10 of this embodiment waterproofs the roof using the multiple first waterproof layers 1, second waterproof layers 2, and third waterproof layers 3, and also insulates the roof using multiple insulating spaces (13, 23, 24, 33, 34, 35).

[0020] Below, the construction process of the waterproof and insulated roof structure 10 of this embodiment will be described in order (FIGS. 3 to 11), and each component of the waterproof and insulated roof structure 10 will be described in detail.

[0021] First, as shown in Figures 3 to 5, a first waterproof layer formation step is carried out to form a first waterproof layer 1 on the roof underlayment 4 of a building. That is, as shown in Figure 3, a long strip-shaped first roofing sheet 11 is laid while being unwound from a roll R along a direction Y perpendicular to the slope direction X of the roof, and multiple first roofing sheets 11 are arranged in parallel in the slope direction X of the roof with their side edges overlapping each other, thereby forming the first waterproof layer 1 over the entire upper surface of the roof underlayment 4.

[0022] In this embodiment, the first roofing sheet 11 is a 100 cm wide, approximately 1 mm thick asphalt felt made by impregnating felt base paper with asphalt, with its side edges overlapping by approximately 10 cm. As shown in Fig. 4, the roof underlayment 4 is constructed by laminating sheathing boards 41 made of structural plywood and sheathing boards 42 made of wood fiberboard coated with a waterproofing agent and having excellent waterproofing, moisture permeability, and sound absorption properties. The first roofing sheet 11 is stapled at its side edges to the sheathing boards 41 of the roof underlayment 4. Of course, the roof underlayment 4 may also be constructed solely of sheathing boards 41 made of structural plywood.

[0023] These multiple first roofing sheets 11 are laid in order from the eaves 43 side of the roof toward the top of the roof slope, and as shown in Figure 4, the lower side edge of the first roofing sheet 11b on the top side of the slope overlaps the upper side edge of the first roofing sheet 11a on the bottom side of the slope. In this way, overlapping portions 12 where adjacent first roofing sheets 11 overlap each other are formed in multiple rows parallel to direction Y.

[0024] By this first waterproof layer forming process, a step is formed between the first waterproof layer 1 and the roof underlayment 4, which is formed from the upper side edge 111 of the first roofing sheet 11a on the lower side of the slope. first A heat insulating space 13 is formed. Various roofing sheets such as asphalt felt have a predetermined thickness necessary to ensure their waterproofing. In addition, they have the flexibility necessary to ensure their workability, but also a predetermined bending stiffness. Therefore, the step formed by the thickness of the side edge 111 of the first roofing sheet 11a on the lower side of the gradient is first Unless the heat insulating space portion 13 is actively compressed during construction, it is formed to extend toward the center of the first roofing sheet 11b on the upper slope side.

[0025] Moreover, in this embodiment, asphalt felt without an adhesive layer is used as the first roofing sheet 11, and only its side edges are stapled, so most of the underside of the first roofing sheet 11 does not adhere to the roof underlayment 4, and there is a gap (not shown) between the underside of the first roofing sheet 11 and the upper surface of the roof underlayment 4. In this embodiment, a wide gap continuous with this gap exists. first A heat insulating space 13 is formed.

[0026] Next, as shown in Figures 6 to 8, a second waterproof layer formation step is performed in which a second waterproof layer 2 is formed on the first waterproof layer 1. That is, as shown in Figure 6, a long strip-shaped second roofing sheet 21 is laid along the slope direction X of the roof while being unwound from a roll R, and multiple second roofing sheets 21 are arranged in parallel in direction Y with their side edges overlapping each other, thereby forming the second waterproof layer 2 over the entire upper surface of the first waterproof layer 1. The laying direction of each second roofing sheet 21 of the second waterproof layer 2 is perpendicular to the laying direction of each first roofing sheet 11 of the first waterproof layer 1.

[0027] In this embodiment, as with the first roofing sheet 11, asphalt felt having a width of 100 cm and a thickness of approximately 1 mm, made by impregnating felt base paper with asphalt, is used as the second roofing sheet 21, and the side edges of the sheets are overlapped by approximately 10 cm. Only the side edges of each second roofing sheet 21 are stapled to the sheathing boards 41 of the roof underlayment 4.

[0028] These multiple second roofing sheets 21 are laid side by side in order from one roof ridge to the other roof ridge 44. As shown in FIG. 7, when viewed upward along the roof slope, the left side edge of the right second roofing sheet 21b overlaps the right side edge of the left second roofing sheet 21a. In this way, overlapping portions 22, where adjacent second roofing sheets 21 overlap, are formed in multiple rows parallel to the roof slope direction X. The overlapping of the second roofing sheets 21 may also be such that the right side edge of the left second roofing sheet overlaps the left side edge of the right second roofing sheet when viewed upward along the roof slope. The overlapping of the second roofing sheets 21 can be selected appropriately taking into account the east-west, north-south, and other directions of the roof.

[0029] By this second waterproof layer forming process, as shown in FIG. 7, a step formed between the second waterproof layer 2 and the first waterproof layer 1 is formed, starting from a step formed by the thickness of the right side edge portion 211 of the left second roofing sheet 21a. secondAt the same time as the heat insulating space portion 23 is formed, as shown in FIG. 8, a step formed by the thickness of the lower side edge portion 111 of the first roofing sheet 11b on the upper side of the gradient is formed as a starting point. third A heat insulating space portion 24 is formed. second Heat insulating space 23 and third The heat insulating spaces 24 are connected to each other near the intersection of the overlapping portion 22 of the second waterproof layer 2 and the overlapping portion 12 of the first waterproof layer 1. As a result, heat insulating spaces (23, 24) are formed between the second waterproof layer 2 and the first waterproof layer 1, extending in a lattice pattern across the entire roof surface of the building. Second insulation space 23 and third insulation space 24 Regarding first Like the heat insulating space portion 13, it is formed over a wide area, starting from the step at the side edge of each roofing sheet and spreading to the center of the adjacent roofing sheet.

[0030] Next, as shown in Figures 9 to 11, a third waterproof layer formation step is performed in which a third waterproof layer 3 is formed on the second waterproof layer 2. That is, as shown in Figure 9, a long strip-shaped third roofing sheet 31 is laid while being unwound from a roll R along a direction Y perpendicular to the slope direction X of the roof, and multiple third roofing sheets 31 are arranged in parallel in the slope direction X of the roof with their side edges overlapping each other, thereby forming the third waterproof layer 3 over the entire upper surface of the second waterproof layer 2. The laying direction of each third roofing sheet 31 of the third waterproof layer 3 is perpendicular to the laying direction of each second roofing sheet 21 of the second waterproof layer 2 and parallel to the laying direction of each first roofing sheet 11 of the first waterproof layer 1.

[0031] In this embodiment, as with the first roofing sheet 11, asphalt felt having a width of 100 cm and a thickness of approximately 1 mm, made by impregnating felt base paper with asphalt, is used as the third roofing sheet 31, and the side edges of the sheets are overlapped by approximately 10 cm. Only the side edges of each third roofing sheet 31 are stapled to the sheathing boards 41 of the roof underlayment 4.

[0032] These multiple third roofing sheets 31 are laid in order from the eaves 43 side of the roof toward the top of the roof slope, and as shown in Figure 10, the lower side edge of the third roofing sheet 31b on the upper side of the slope overlaps the upper side edge of the third roofing sheet 31a on the lower side of the slope. In this way, overlapping portions 32, where adjacent third roofing sheets 31 overlap, are formed in multiple rows parallel to direction Y. In this embodiment, the laying positions of the overlapping portions 32 of the third waterproof layer 3 are aligned with the laying positions of the overlapping portions 12 of the first waterproof layer 1.

[0033] By this third waterproof layer forming process, as shown in FIG. 10, a step formed between the third waterproof layer 3 and the second waterproof layer 2 is formed starting from a step formed by the thickness of the upper side edge 311 of the third roofing sheet 31a on the lower side of the gradient. fourth At the same time as the heat insulating space portion 33 is formed, as shown in FIG. 11, when viewed from above the slope of the roof, a step is formed on the left side edge portion 211 of the second roofing sheet 21b on the right side. Fifth A heat insulating space portion 34 is formed. fourth Heat insulating space portion 33 and Fifth The heat insulating spaces 34 are connected to each other near the intersection of the overlapping portion 32 of the third waterproof layer 3 and the overlapping portion 22 of the second waterproof layer 2. As a result, heat insulating spaces (33, 34) are formed between the third waterproof layer 3 and the second waterproof layer 2, extending in a lattice pattern over the entire roof surface of the building. Fourth heat insulating space 33 and fifth heat insulating space 34 Regarding first Like the heat insulating space portion 13, it is formed over a wide area, starting from the step at the side edge of each roofing sheet and spreading to the center of the adjacent roofing sheet.

[0034] By carrying out the first waterproof layer forming step to the third waterproof layer forming step in order, the waterproof and heat-insulating roof structure 10 of this embodiment is constructed on the roof underlayment 4.

[0035] 1 and 2, the roof of the building is constructed by laying various roofing materials 5 such as roof tiles, slates, metal sheets, etc. on the third waterproof layer 3 of the waterproof and insulating roof structure 10 of this embodiment. In this embodiment, strip-shaped metal sheets made of aluminum-zinc alloy plated steel sheets are used as the roofing materials 5, and multiple metal sheets are laid vertically along the slope direction X of the roof.

[0036] In the waterproof and insulating roof structure 10 of this embodiment, the total thickness of the waterproof layers is greatest at the triple intersection of the overlapping portion 12 of the first waterproof layer 1, the overlapping portion 22 of the second waterproof layer 2, and the overlapping portion 32 of the third waterproof layer 3, and recesses are formed on the upper surface of the third waterproof layer 3 in areas other than the triple intersection. Therefore, when a roofing material 5 is laid on the third waterproof layer 3, as shown in Figures 1 and 2, there are interconnected spaces between the roofing material 5 and the third waterproof layer 3 in areas other than the triple intersection. Sixth A heat insulating space 35 is formed.

[0037] As described above, according to the waterproof and insulating roof structure 10 of this embodiment, multiple first waterproof layers 1, second waterproof layers 2, and third waterproof layers 3 are formed, each consisting of multiple strip-shaped roofing sheets, so that the waterproofing properties are extremely excellent and it is possible to reliably prevent leaks from the roof, etc. In addition, multiple insulating spaces (13, 23, 24, 33, 34, 35) are formed between the roof underlayment 4 and the first waterproof layer 1, between the first waterproof layer 1 and the second waterproof layer 2, between the second waterproof layer 2 and the third waterproof layer 3, and between the third waterproof layer 3 and the roofing material 5, so that the insulating properties are also excellent and it is possible to effectively prevent condensation caused by cold air outside during the winter.

[0038] Furthermore, according to the waterproof and insulating roof structure 10 of this embodiment, the insulating space (23, 24, 33, 34) between the first waterproof layer 1, the second waterproof layer 2, and the third waterproof layer 3 can be formed by utilizing the steps caused by the thickness of the side edge ends of each roofing sheet, without using separate components such as spacers, so that construction is extremely easy without incurring high costs as with conventional products.

[0039] Although the waterproof and heat-insulating roof structure 10 of this embodiment has been described above, the present invention can also be implemented in other embodiments.

[0040] For example, in the above embodiment, the laying position of the overlapping portion 32 of the third waterproof layer 3 is aligned with the laying position of the overlapping portion 12 of the first waterproof layer 1, but the present invention is not necessarily limited to this. As shown in Fig. 12, the laying position of the overlapping portion 32 of the third waterproof layer 3 may be different from the laying position of the overlapping portion 12 of the first waterproof layer 1. This allows the overlapping portion 32 of the third waterproof layer 3 to be formed along the overlapping portion 32. fourth The insulating space 33 and the first waterproof layer 1 are formed along the overlapping portion 12. first The positions at which the heat insulating spaces 13 are formed can be shifted, and the heat insulating spaces (33, 13) can be formed more uniformly over the entire roof surface.

[0041] Furthermore, in the above embodiment, the first roofing sheet 11 of the first waterproof layer 1 is laid along direction Y perpendicular to the roof slope direction X, the second roofing sheet 21 of the second waterproof layer 2 is laid along the roof slope direction X, and the third roofing sheet 31 of the third waterproof layer 3 is laid along the roof direction Y, but the present invention is not necessarily limited to this, and the first roofing sheet 11 of the first waterproof layer 1 may be laid along the roof slope direction X, the second roofing sheet 21 of the second waterproof layer 2 may be laid along the roof direction Y, and the third roofing sheet 31 of the third waterproof layer 3 may be laid along the roof slope direction X. The laying direction of each of these roofing sheets can be appropriately modified in design, taking into account, for example, the type of roofing material 5 and its laying direction.

[0042] In addition, in the above embodiment, the same asphalt felt is used for the first roofing sheet 11, the second roofing sheet 21, and the third roofing sheet 31, but the present invention is not limited to this, and various types of roofing sheets, such as asphalt roofing and asphalt roofing with an adhesive layer, can be used as appropriate. Furthermore, the type, width, thickness, etc. of the strip-shaped roofing sheets may be different in each of the waterproof layers, the first waterproof layer 1, the second waterproof layer 2, and the third waterproof layer 3.

[0043] Also, The waterproof and heat-insulating roof structure according to the present invention may be composed of four or more waterproof layers.

[0044] The present invention may be embodied in various other forms, including improvements, modifications, and variations based on the knowledge of a person skilled in the art, without departing from the spirit of the invention. Furthermore, within the scope of producing the same action or effect, any of the features specifying the invention may be substituted with other technology, and an integrally configured feature of the invention may be composed of multiple components, or an integrally configured feature of the invention consisting of multiple components may be embodied. [Explanation of symbols]

[0045] 10 Waterproof and insulated roof structure 1 First waterproof layer 11 First Roofing Sheet 111 (First roofing sheet) side edge 12 (First roofing sheet overlap) 13 first Insulated space 2 Second waterproof layer 21 Second roofing sheet 211 (Second roofing sheet) side edge 22 (Second roofing sheet overlap) twenty three second Insulated space twenty four third Insulated space 3 Third waterproof layer 31 Third roofing sheet 311 (Third roofing sheet) side edge 32 (between third roofing sheets) overlapping section 33 fourth Insulated space 34 Fifth Insulated space 35 Sixth Insulated space 4 Roof underlayment 5. Roofing materials X Roof slope direction Y: The direction perpendicular to the roof slope direction

Claims

1. A waterproof and insulating roof structure installed between the roofing material and the roof underlayment of a building, a first waterproof layer formed on the roof underlayment and consisting of a plurality of strip-shaped first roofing sheets laid in parallel with their side edges overlapping one another; A second waterproof layer formed on the first waterproof layer and consisting of a plurality of strip-shaped second roofing sheets laid in parallel with their side edges overlapping each other; a third waterproof layer formed on the second waterproof layer and consisting of a plurality of strip-shaped third roofing sheets laid in parallel with their side edges overlapping one another; Equipped with A first insulation space (13) is formed between the first waterproof layer and the roof underlayment, starting from a step occurring at the side edge end of each of the first roofing sheets, The laying direction of each second roofing sheet of the second waterproof layer is perpendicular to the laying direction of each first roofing sheet of the first waterproof layer, Between the second waterproof layer and the first waterproof layer, a second insulating space portion (23) is formed starting from a step occurring at the side edge end of each of the second roofing sheets, and a third insulating space portion (24) is formed starting from a step occurring at the side edge end of each of the first roofing sheets, The laying direction of each of the third roofing sheets of the third waterproof layer and the laying direction of each of the second roofing sheets of the second waterproof layer are perpendicular to each other, Between the third waterproof layer and the second waterproof layer, a fourth insulation space portion (33) is formed, the fourth insulation space portion (33) originating from a step occurring at the side edge end of each of the third roofing sheets, and a fifth insulation space portion (34) originating from a step occurring at the side edge end of each of the second roofing sheets, A waterproof and insulating roof structure characterized in that the laying position of the overlapping portion (32) between the third roofing sheets of the third waterproof layer is made different from the laying position of the overlapping portion (12) between the first roofing sheets of the first waterproof layer, thereby shifting the formation positions of the fourth insulation space portion (33) formed along the overlapping portion (32) of the third waterproof layer and the first insulation space portion (13) formed along the overlapping portion (12) of the first waterproof layer.

2. Each of the first roofing sheets of the first waterproof layer is laid along a direction perpendicular to the slope direction of the roof, Each of the second roofing sheets of the second waterproof layer is laid along the slope direction of the roof, 2. A waterproof and insulating roof structure as described in claim 1, characterized in that each of the third roofing sheets of the third waterproof layer is laid along a direction perpendicular to the slope direction of the roof.

3. 3. A waterproof and heat-insulating roof structure according to claim 1, wherein the first roofing sheet, the second roofing sheet and the third roofing sheet are made of asphalt felt.

4. 3. The waterproof and heat-insulating roof structure according to claim 1, wherein the roofing material is made of metal sheet.

5. A construction method for a waterproof and insulating roof structure installed between a roofing material and a roof underlayment of a building, comprising: a first waterproof layer forming step of forming a first waterproof layer by laying a plurality of strip-shaped first roofing sheets in parallel on the roof underlayment with their side edges overlapping each other; a second waterproof layer formation process in which a second waterproof layer is formed by laying a plurality of strip-shaped second roofing sheets on the first waterproof layer in a state where their side edges are overlapped with each other and in parallel so that the laying direction of each second roofing sheet is perpendicular to the laying direction of each first roofing sheet on the first waterproof layer; a third waterproof layer formation process in which a third waterproof layer is formed by laying a plurality of strip-shaped third roofing sheets on the second waterproof layer in parallel with each other with their side edges overlapping each other and so that the laying direction of each third roofing sheet is perpendicular to the laying direction of each second roofing sheet on the second waterproof layer; Equipped with In the first waterproof layer forming step, a first insulation space portion (13) is formed between the first waterproof layer and the roof base material, starting from a step occurring at the side edge end of each of the first roofing sheets; In the second waterproof layer forming step, a second insulating space portion (23) is formed between the second waterproof layer and the first waterproof layer, the second insulating space portion (23) originating from a step occurring at the side edge end of each of the second roofing sheets, and a third insulating space portion (24) originating from a step occurring at the side edge end of each of the first roofing sheets, In the third waterproof layer forming step, Between the third waterproof layer and the second waterproof layer, a fourth insulation space portion (33) is formed starting from a step occurring at the side edge end of each of the third roofing sheets, and a fifth insulation space portion (34) is formed starting from a step occurring at the side edge end of each of the second roofing sheets, A construction method for a waterproof and insulating roof structure, characterized in that the laying position of the overlapping portion (32) between the third roofing sheets of the third waterproof layer is made different from the laying position of the overlapping portion (12) between the first roofing sheets of the first waterproof layer, thereby shifting the formation positions of the fourth insulation space (33) formed along the overlapping portion (32) of the third waterproof layer and the first insulation space (13) formed along the overlapping portion (12) of the first waterproof layer.

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