JP7048807B1 - Waterproof structure of flat roof and waterproof construction method of flat roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure waterproofness of a flat roof while continuing to use the solar panel without removing the solar panel in a structure in which a solar panel is adhesively fixed on an existing waterproof layer on the flat roof. SOLUTION: A flat roof waterproof structure 12 has a solar panel 22 bonded and fixed to a first waterproof layer 18 provided on a flat roof 14 of a building, and a portion of the first waterproof layer 18 where the solar panel 22 is not provided. It has a second waterproof layer 24 that covers and overlaps the solar panel 22 on the opposite side of the first waterproof layer 18 over the entire circumference of the solar panel 22. [Selection diagram] Fig. 2

Description

The technique disclosed in the present application relates to a flat roof waterproof structure and a flat roof waterproof construction method.

Patent Document 1 describes a sheet waterproof solar power generation panel set constructed on a building frame via a sheet joining plate.

Japanese Unexamined Patent Publication No. 2006-28803

The panel set described in Patent Document 1 is a photovoltaic cell in a state in which a transparent upper surface protective layer is arranged on a metal substrate via a crystalline silicon photovoltaic cell module, and a sealing agent filled between the substrate and the upper surface protective layer is used. It has multiple photovoltaic panels with sealed modules and a waterproof connecting sheet that can be fixed to the sheet joint plate.

In a structure in which a solar panel is adhesively fixed on an existing waterproof layer of a flat roof, it may be necessary to newly secure waterproofness due to deterioration of the waterproof performance of the existing waterproof layer. However, it is difficult to remove the solar panel adhesively fixed to the existing waterproof layer, and even if it can be removed, the solar panel may be damaged.

In consideration of the above facts, the present application aims to ensure the waterproofness of the flat roof while continuing to use it without removing the solar panel in the structure in which the solar panel is adhesively fixed on the existing waterproof layer on the flat roof. The purpose.

The waterproof structure of the flat roof of the first aspect covers the solar panel adhesively fixed to the first waterproof layer provided on the flat roof of the building and the portion of the first waterproof layer where the solar panel is not present, and also covers the portion of the first waterproof layer without the solar panel. It has a second waterproof layer that overlaps the solar panel on the opposite side of the first waterproof layer over the entire circumference of the solar panel.

That is, the second waterproof layer covers the portion of the first waterproof layer provided on the flat roof where there is no panel. Further, the second waterproof layer is on the opposite side of the first waterproof layer and overlaps the solar panel over the entire circumference of the solar panel. In this way, by providing the second waterproof layer extending from the first waterproof layer to the entire circumference of the solar panel, the waterproofness of the flat roof can be ensured in the structure in which the solar panel is adhesively fixed on the existing waterproof layer. Further, the second waterproof layer can be installed on the portion where the first waterproof layer does not have a panel and the entire circumference of the solar panel without removing the solar panel.

In the second aspect, the second waterproof layer overlaps the solar panel at a position avoiding the light receiving range of the solar panel in a plan view of the solar panel.

Since the second waterproof layer does not cover the light receiving range of the solar panel, the power generation amount of the solar panel does not decrease.

In the third aspect, the solar panel has a panel-side adhesion layer that adheres the solar panel and the second waterproof layer.

The close contact layer on the panel side can reliably maintain the close contact state between the solar panel and the second waterproof layer.

In the fourth aspect, the roof-side contact layer is provided so that the first waterproof layer and the second waterproof layer are in close contact with each other, and the material of the panel-side contact layer is different from the material of the roof-side contact layer.

By using the panel-side adhesion layer as a material suitable for adhesion between the solar panel and the second waterproof layer, these can be more reliably adhered to each other.

In the fifth aspect of the flat roof waterproofing construction method, the solar panel that is adhesively fixed to the first waterproof layer provided on the flat roof of the building is covered with the portion of the first waterproof layer that does not have the solar panel. A second waterproof layer is provided on the opposite side of the first waterproof layer so as to overlap the solar panel over the entire circumference of the solar panel.

That is, the second waterproof layer is provided so as to cover the portion of the first waterproof layer provided on the flat roof where there is no panel. Further, the second waterproof layer is provided on the opposite side of the first waterproof layer so as to overlap the solar panel over the entire circumference of the solar panel. In this way, by providing the second waterproof layer extending from the first waterproof layer to the entire circumference of the solar panel, the waterproofness of the flat roof can be ensured in the structure in which the solar panel is adhesively fixed on the existing waterproof layer. Further, the second waterproof layer can be installed on the portion where the first waterproof layer does not have a panel and the entire circumference of the solar panel without removing the solar panel.

In the sixth aspect, the liquid waterproof layer material is applied to the first waterproof layer and the solar panel to form the second waterproof layer.

Since the second waterproof layer is formed by applying a liquid waterproof layer material, the construction is easier than when a solid material is used, for example.

In the seventh aspect, the waterproof layer material is applied in a state where the light receiving range of the solar panel is covered with a covering material.

It is possible to prevent a situation in which a liquid waterproof layer material is applied to the light receiving range of the solar panel.

In the present application, in a structure in which a solar panel is adhesively fixed on an existing waterproof layer on a flat roof, the waterproofness of the flat roof can be ensured while continuing to be used without removing the solar panel.

FIG. 1 is a plan view showing a flat roof to which the waterproof structure of the flat roof of the first embodiment is applied. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 showing a flat roof to which the waterproof structure of the flat roof of the first embodiment is applied. FIG. 3 is a perspective view showing a solar panel used in the disclosed technology. FIG. 4 is a partially enlarged cross-sectional view showing a flat roof to which the waterproof structure of the flat roof of the first embodiment is applied. FIG. 5 is an exploded cross-sectional view showing a partially enlarged view of the flat roof to which the waterproof structure of the flat roof of the first embodiment is applied. FIG. 6 is a plan view showing a flat roof at a stage before the waterproof structure of the flat roof of the first embodiment is applied. FIG. 7 is a sectional view taken along line 7-7 of FIG. 7 showing a flat roof in a stage before the waterproof structure of the flat roof of the first embodiment is applied. FIG. 8 is a partially enlarged cross-sectional view showing the flat roof in the stage before the waterproof structure of the flat roof of the first embodiment is applied. FIG. 9 is a cross-sectional view showing a partially enlarged view of the flat roof in the middle of performing the waterproof construction method of the flat roof of the first embodiment. FIG. 10 is a cross-sectional view showing a partially enlarged view of the flat roof in the middle of performing the waterproof construction method of the flat roof of the first embodiment. FIG. 11 is a cross-sectional view showing a partially enlarged view of the flat roof in the middle of performing the waterproof construction method of the flat roof of the first embodiment. FIG. 12 is a partially enlarged cross-sectional view showing a flat roof to which the waterproof structure of the flat roof of the modified example of the first embodiment is applied.

Hereinafter, an example of the embodiment of the present application will be described in detail with reference to the drawings.

FIG. 1 shows a flat roof 14 to which the waterproof structure 12 of the flat roof of the first embodiment is applied in a plan view. FIG. 2 shows the flat roof waterproof structure 12 of the first embodiment as a 2-2 line cross section of FIG.

As shown in FIG. 2, the flat roof 14 of the building is provided with the first waterproof layer 18 on the rooftop material 16 constituting the flat roof 14. The first waterproof layer 18 is formed by using, for example, urethane, a fiber reinforced resin, or the like. The first waterproof layer 18 prevents water on the flat roof 14 from entering the building, and the water flows into a drainage ditch (not shown).

One or more (three in the example shown in FIG. 1) solar panels 22 are adhesively fixed to the first waterproof layer 18 by using an adhesive 20.

As shown in FIG. 3, the solar panel 22 is a rectangle having four sides (long side and short side) in a plan view (arrow A direction view). A frame-shaped edge 22F is set along the four sides of the light receiving surface of the solar panel 22, and the inner portion of the edge 22F receives sunlight for actual power generation 22E. Is.

In the solar panel 22 according to the technique disclosed in the present application, the length of the long side and the short side of the rectangular shape is sufficiently secured, and the thickness is reduced to reduce the weight. The solar panel 22 that has been made thinner and lighter in this way can be easily installed on the flat roof 14. Further, the solar panel 22 which has been made thinner and lighter in this way is directly adhered and fixed on the first waterproof layer 18 of the flat roof 14 by the adhesive 20 without using a pedestal or the like. , The shape of the solar panel 22 is maintained stably.

As shown in FIG. 1, the first waterproof layer 18 has a portion in which the solar panel 22 is installed and a portion in which the solar panel 22 is not installed.

As shown in FIGS. 4 and 5, the waterproof structure 12 of the flat roof of the first embodiment further has a second waterproof layer 24. The second waterproof layer 24 covers at least the portion of the first waterproof layer 18 where the solar panel 22 is absent. The second waterproof layer 24 is formed of, for example, urethane.

A roof-side adhesion layer 26 is arranged between the first waterproof layer 18 and the second waterproof layer 24. The roof-side contact layer 26 causes the second waterproof layer 24 to be in close contact with the first waterproof layer 18. For the roof-side adhesion layer 26, a material capable of effectively enhancing the adhesion thereof is selected in consideration of the materials of the first waterproof layer 18 and the second waterproof layer 24.

On the opposite side (upper side in the vertical direction) of the first waterproof layer 18, the second waterproof layer 24 corresponds to the four sides of the solar panel 22 and overlaps the solar panel 22 over the entire circumference. The portion of the second waterproof layer 24 that overlaps with the solar panel 22 is referred to as an overlapping portion 24P.

A panel-side adhesion layer 28 is arranged between the edge portion 22F of the solar panel 22 and the overlapping portion 24P of the second waterproof layer 24. Due to the panel-side contact layer 28, the overlapping portion 24P of the second waterproof layer 24 is in close contact with the edge portion 22F of the solar panel 22. Therefore, the overlapping portion 24P of the second waterproof layer 24 overlaps with the edge portion 22F of the solar panel 22 via the panel-side contact layer 28. In other words, it can be said that the panel-side contact layer 28 also forms a part of the solar panel 22.

For the panel-side adhesion layer 28, a material capable of effectively enhancing the adhesion between the solar panel 22 and the second waterproof layer 24 is selected in consideration of the materials. In particular, in the present embodiment, the material of the panel-side contact layer 28 is different from the material of the roof-side contact layer 26.

In the present embodiment, the panel-side adhesion layer 28 is formed, for example, with a surface density of 0.1 kg / m ² or more and 0.3 kg / m ² or less. As a result, the solar panel 22 and the second waterproof layer 24 can be reliably brought into close contact with each other without making the panel-side contact layer 28 excessively thick. The panel-side adhesion layer 28 functions as an undercoat layer (primer) when the second waterproof layer 24 is brought into close contact with the solar panel 22.

As shown in FIG. 4, the overlapping portion 24P of the second waterproof layer 24 has a predetermined width W1 and a thickness T1. The width W1 referred to here is the lateral length of the overlapping portion 24P in the cross section (cross section shown in FIG. 4) orthogonal to the extending direction of each side of each of the four sides of the solar panel 22. Further, the thickness T1 is also a cross section shown in FIG. 4, and is the length of the overlapping portion 24P in the normal direction (arrow A direction) of the solar panel 22.

The upper limit of the width W1 of the overlapping portion 24P is set shorter than the width W2 of the edge portion 22F of the solar panel 22. Therefore, the second waterproof layer 24 does not cover the light receiving range 22E of the solar panel 22. The upper limit of the width W1 of the overlapping portion 24P is 53 mm as an example.

The lower limit of the width W1 of the overlapping portion 24P is set so that the second waterproof layer 24 can secure a predetermined length or more for surely adhering to the solar panel 22 via the panel side adhesion layer 28. The lower limit of the width W1 of the overlapping portion 24P is 10 mm as an example.

Further, in the overlapping portion 24P, the adhesion to the solar panel 22 is lowered regardless of whether the thickness T1 is too thick or too thin. The upper limit and the lower limit of the thickness T1 of the overlapping portion 24P are set within a range in which the second waterproof layer 24 can sufficiently secure the adhesion to the solar panel 22. The range of the thickness of the overlapping portion 24P is, for example, 1.0 mm or more and 3.0 mm or less.

Next, the waterproof construction method of the flat roof for obtaining the waterproof structure 12 of the flat roof of the first embodiment and the operation of the waterproof structure 12 of the flat roof will be described.

As shown in FIGS. 7 and 8, the solar panel 22 is adhesively fixed on the first waterproof layer 18 of the flat roof 14 by the adhesive 20. The time for adhesively fixing the solar panel 22 to the first waterproof layer 18 may be, for example, at the time of construction of the building or at a specific time after construction, but at least the second waterproof layer 24 may be attached. Before the installation, the solar panel 22 is adhesively fixed on the first waterproof layer 18 by the adhesive 20.

In particular, the life of the solar panel 22 (the period during which the power generation capacity can be maintained within a predetermined range) is often longer than the life of the first waterproof layer 18 (the period during which the waterproof performance can be maintained). For example, the life of the solar panel 22 may be about 20 to 30 years, while the life of the first waterproof layer 18 may be about 10 years. The life of the first waterproof layer 18 is substantially the waterproof life of the flat roof 14. As described above, although it is necessary to secure or maintain the waterproofness of the flat roof 14, the waterproof construction method of the first embodiment is applied to the flat roof 14 in a state where the life of the solar panel 22 remains.

First, as shown in FIG. 9, in the solar panel 22, the covering material 32 is attached to the light receiving surface side. The covering material 32 is provided so as to cover at least the light receiving range 22E in the vicinity of the edge portion 22F of each of the four sides of the solar panel 22. The covering material 32 is a member for the purpose of preventing the waterproof layer material 34 from covering the light receiving range 22E when the liquid waterproof layer material 34 (see FIG. 11) is applied to the solar panel 22 in a later step. be. Therefore, the shape of the covering material 32 in the plan view of the solar panel 22 may be any shape necessary to achieve such an object. For example, in the plan view of the solar panel 22, it is not necessary to provide the covering material 32 up to the central portion of the light receiving range 22E (see FIG. 3).

Next, as shown in FIG. 10, the roof-side contact layer 26 is formed on the first waterproof layer 18, and the panel-side contact layer 28 is formed on the solar panel 22.

The roof-side adhesion layer 26 is formed in the portion of the first waterproof layer 18 where there is no panel. The portion without the panel is a portion where the second waterproof layer 24 is formed on the first waterproof layer 18 in a later step.

The roof-side adhesion layer 26 can be formed by applying a liquid adhesion layer material to the first waterproof layer 18. As the adhesion layer material of the roof side adhesion layer 26, a material suitable for these adhesions is selected in consideration of the material of the first waterproof layer 18 and the material of the second waterproof layer 24.

The panel-side contact layer 28 is formed on the edge portion 22F of the solar panel 22. The edge portion 22F is a portion where the second waterproof layer 24 is formed on the solar panel 22 in a later step. Since the solar panel 22 is provided with the covering material 32, the covering material 32 can be used as a position reference when forming the panel-side adhesion layer 28. Further, by providing the covering material 32, it is prevented that the panel-side close contact layer 28 covers the light receiving range 22E.

The panel-side adhesion layer 28 can also be formed by applying a liquid adhesion layer material to the edge portion 22F of the solar panel 22. As the adhesion layer material of the panel-side adhesion layer 28, a material suitable for these adhesions is selected in consideration of the material of the solar panel 22 and the material of the second waterproof layer 24.

The front-back relationship that forms the roof-side contact layer 26 and the panel-side contact layer 28 does not matter, and one of them may be ahead of the other or may be substantially simultaneous.

Next, the second waterproof layer 24 (see FIGS. 2 and 4) is formed. In the present embodiment, as shown in FIG. 11, the formation of the second waterproof layer 24 is performed by using a liquid waterproof layer material 34 (for example, liquid urethane) constituting the second waterproof layer 24 in the first waterproof layer 18. This is done by applying it to the portion where there is no space and the edge portion 22F of the solar panel 22.

The solar panel 22 is provided with a covering material 32 that covers the light receiving range 22E in the vicinity of the edge portion 22F. Therefore, when the liquid waterproof layer material 34 is applied to the solar panel 22, even if the waterproof layer material 34 flows and spreads, it is possible to prevent the situation where the light receiving range 22E is covered.

Then, the liquid waterproof layer material 34 is solidified to form the second waterproof layer 24. The covering material 32 is removed in the state where the waterproof layer material 34 is solidified or before it is completely solidified.

Since the roof-side contact layer 26 is provided on the first waterproof layer 18, the roof-side contact layer 26 provides a state in which the second waterproof layer 24 is in close contact with the first waterproof layer 18. Similarly, since the solar panel 22 is provided with the panel-side contact layer 28, a state in which the solar panel 22 is in close contact with the second waterproof layer 24 can be obtained.

As described above, the waterproof structure 12 for the flat roof according to the technique disclosed in the present application can be obtained. In the waterproof structure 12 of the flat roof, the second waterproof layer 24 covers the portion of the first waterproof layer 18 where there is no panel, and further, the light receiving surface of the solar panel 22 (positioned on the opposite side of the first waterproof layer 18). It is in a state of being overlapped with the solar panel 22 over the entire circumference along the four sides. Therefore, even if the waterproof performance of the first waterproof layer 18 is deteriorated due to the life, the waterproofness of the flat roof 14 can be ensured by the second waterproof layer 24.

In particular, the technique disclosed in the present application targets a waterproof structure of a flat roof 14 on which a solar panel 22 is installed. On the flat roof 14, the mass and thickness of the solar panels that can be installed may be limited due to load restrictions, height restrictions, and the like. On the other hand, the solar panel 22 in the technique disclosed in the present application can be installed on the flat roof 14 without being subject to the above restrictions by reducing the thickness and weight.

However, as shown in FIG. 7, the thinned and lightweight solar panel 22 is directly adhered and fixed to the rooftop material 16 of the flat roof 14 by the adhesive 20. It is difficult to remove the solar panel 22 once adhesively fixed, and the removal may cause damage to the solar panel 22.

In the present embodiment, it is not necessary to remove the solar panel 22 from the rooftop material 16 in order to ensure the waterproofness of the flat roof 14 in this way. That is, it is possible to provide a waterproof structure to the flat roof 14 without removing the solar panel 22. For example, even if the first waterproof layer 18 reaches the end of its life, the waterproofness of the flat roof 14 can be ensured while continuing to use the solar panel 22 having the remaining life.

However, the application of the technique disclosed in the present application is not limited to the flat roof 14 on which the solar panel 22 which has been made thinner and lighter is installed. That is, for example, the technique disclosed in the present application can be applied to a flat roof to which a solar panel having a thickness and a mass larger than that of the solar panel 22 shown in FIG. 3 is adhesively fixed.

In the above-mentioned method for waterproofing a flat roof according to the first embodiment, a liquid waterproof layer material 34 is used to form the second waterproof layer 24. Instead of such a liquid waterproof layer material 34, a waterproof sheet or a waterproof tape formed in a predetermined shape is attached to the first waterproof layer 18 and the solar panel 22 to form the second waterproof layer 24. You may. When the liquid waterproof layer material 34 is used as described above, it is easy to handle at the construction site and has a high degree of freedom in shape, so that it is second to the solar panel 22 having various shapes, sizes and arrangements. The waterproof layer 24 can be easily formed at the construction site.

In the first embodiment, the panel-side close contact layer 28 is provided, but even if the structure does not have such a second waterproof layer 24, the overlapping portion 24P of the second waterproof layer 24 is the edge portion of the solar panel 22. It is possible to form the waterproof structure 12 of the flat roof by arranging it in contact with the 22F. That is, even with such a structure, when the waterproof performance of the first waterproof layer 18 is deteriorated due to the service life, the waterproofness of the flat roof 14 can be ensured by the second waterproof layer 24.

In the first embodiment, the overlapping portion 24P of the second waterproof layer 24 is further adhered to the edge portion 22F of the solar panel 22 by the panel side contact layer 28. Therefore, the overlapping portion 24P of the second waterproof layer 24 can maintain the close contact with the edge portion 22F of the solar panel 22 more strongly than the structure without the panel side close contact layer 28. For example, even if an earthquake or vibration of the surrounding environment acts, it is possible to suppress the formation of gaps or cracks between the solar panel 22 and the second waterproof layer 24. As a result, it is possible to prevent moisture from entering between the solar panel 22 and the second waterproof layer 24 and reaching the first waterproof layer 18.

As the panel-side adhesion layer 28, for example, a liquid adhesion layer material can be used. By using the liquid adhesion layer material, the panel-side adhesion layer 28 can be easily formed at the construction site for the solar panels 22 of various shapes and sizes. In addition to this, a sheet-shaped or tape-shaped adhesive layer material can be used as the panel-side adhesive layer 28.

In particular, in the present embodiment, as the adhesion layer material of the roof side adhesion layer 26, a material suitable for adhesion between the first waterproof layer 18 and the second waterproof layer 24 is selected, and the adhesion layer of the panel side adhesion layer 28 is selected. As the material, a material suitable for adhesion between the material of the solar panel 22 and the second waterproof layer 24 is selected. As the adhesion layer material of the panel side adhesion layer 28, a material different from the adhesion layer material of the roof side adhesion layer 26 can be selected to improve the adhesion between the solar panel 22 and the second waterproof layer 24. Of course, the adhesion layer material of the panel-side adhesion layer 28 and the adhesion layer material of the roof-side adhesion layer 26 may be the same.

In the flat roof waterproof structure 12 of the present embodiment, as shown in FIG. 4, the width W1 of the overlapping portion 24P of the second waterproof layer 24 is set to be equal to or less than a predetermined upper limit value, and the second waterproof layer 24 is the sunlight. It does not cover the light receiving range 22E of the panel 22. Therefore, it does not affect the amount of power generated by the solar panel 22.

Further, the width W1 of the overlapping portion 24P of the second waterproof layer 24 is set to be equal to or more than a predetermined lower limit value, and the thickness of the second waterproof layer 24 is also set within a predetermined range (within the range of the upper limit value and the lower limit value). Has been done. In such a configuration in which the width W1 of the overlapping portion 24P of the second waterproof layer 24 and the thickness satisfy the predetermined range, for example, the width W1 of the overlapping portion 24P of the second waterproof layer 24 does not meet the predetermined lower limit value. The state in which the second waterproof layer 24 is in close contact with the solar panel 22 can be reliably maintained as compared with the configuration, the configuration in which the thickness is out of the predetermined range, and the like.

The second waterproof layer 24 has overlapping portions 24P on each of the four sides of the solar panel 22. That is, waterproofness can be ensured by the second waterproof layer 24 on any of the four sides of the solar panel 22.

Further, the structure of the panel-side adhesion layer 28 is not limited to that shown in FIG. 4, and may be, for example, the structure shown in FIG. 12 as a modification of the first embodiment.

In this modification, the panel-side contact layer 28 is provided so as to be continuous not only on the upper surface of the solar panel 22 but also on the side surface. In this structure, the second waterproof layer 24 is in close contact with the panel-side contact layer 28 also on the side surface of the solar panel 22, so that the adhesion is further improved.

12 Waterproof structure 14 Flat roof 16 Rooftop material 18 First waterproof layer 20 Adhesive 22 Solar panel 22E Light receiving range 22F Edge 24 Second waterproof layer 24P Overlapping part 26 Roof side adhesive layer 28 Panel side adhesive layer 32 Covering material 34 Waterproof layer material

Claims (9)

A solar panel glued and fixed to the first waterproof layer on the flat roof of the building,
A second waterproof layer that covers the entire portion of the first waterproof layer without the solar panel and that overlaps the solar panel on the opposite side of the first waterproof layer over the entire circumference of the solar panel.
The waterproof structure of the flat roof. The waterproof structure for a flat roof according to claim 1, wherein the second waterproof layer overlaps the solar panel at a position avoiding the light receiving range of the solar panel in a plan view of the solar panel. The waterproof structure for a flat roof according to claim 1 or 2, further comprising a panel-side adhesion layer that brings the solar panel into close contact with the second waterproof layer. The waterproof structure for a flat roof according to claim 3, further comprising a roof-side adhesion layer that adheres the first waterproof layer and the second waterproof layer. The waterproof structure for a flat roof according to claim 4, wherein the material of the panel-side contact layer is different from the material of the roof-side contact layer. With respect to the solar panel adhesively fixed to the first waterproof layer provided on the flat roof of the building, the entire portion of the first waterproof layer without the solar panel is covered, and the opposite side of the first waterproof layer is covered. A method for waterproofing a flat roof, in which a second waterproof layer is provided so as to overlap the solar panel over the entire circumference of the solar panel. The waterproof construction method for a flat roof according to claim 6, wherein the first waterproof layer and the second waterproof layer are brought into close contact with each other by a roof-side adhesion layer to provide the second waterproof layer. The method for waterproofing a flat roof according to claim 6 or 7 , wherein a liquid waterproof layer material is applied to the first waterproof layer and the solar panel to form the second waterproof layer. The waterproof construction method for a flat roof according to claim 8 , wherein the waterproof layer material is applied in a state where the light receiving range of the solar panel is covered with a covering material.

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