Metal roof heat insulation waterproof structure and metal roof heat insulation waterproof construction method

Abstract

To provide a metal roof heat insulation waterproof structure and a metal roof heat insulation waterproof construction method, which improve wind pressure resistance, prevent tread-through of a waterproof base board when walking on the metal roof, improve heat insulation, and make it difficult for dew to occur.SOLUTION: Provided is a metal roof heat insulation and waterproof structure 10 including: a metal roof 1 having a recess 11 and a protrusion 12; a hard heat insulation material 2 fixed to the protrusion 12 so as to cover the recess 11 of the metal roof 1; an urethane foam 3 sprayed and filled into the recess 11 of the metal roof 1; and a waterproof sheet 4 joined to a surface of the hard heat insulation material 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a thermal insulation and waterproof structure and a thermal insulation and waterproof construction method that are constructed by laying a thermal insulation material and a waterproof layer on a metal roof. [Background technology]

[0002] Metal roofs made by processing metal sheets, such as folded plate roofs and tile roofs, are known. In general, metal roofs are lighter than concrete roofs such as RC and ALC, and tile roofs, and installation work is easier. Taking advantage of these advantages, metal roofs are widely used, mainly in factories, warehouses, large commercial facilities, etc. Metal roofs easily transmit heat, and rainwater easily penetrates through the joints of the metal sheets and the fixing bolt holes, so it is preferable to apply either or both of insulation and waterproofing treatment.

[0003] Insulation treatments for metal roofs can be broadly divided into internal and external insulation. Internal insulation is a method of placing insulation material on the inside of a metal roof, while external insulation is a method of placing insulation material on the outside of a metal roof. External insulation can reduce temperature changes in the metal roof itself, making it possible to extend its service life. In addition, placing insulation material on the outside of a metal roof provides a smooth surface without steps, which has the advantage of making it easier to apply waterproofing, and so the use of external insulation is on the rise.

[0004] As an example of a heat-insulating and waterproof structure for a metal roof, Patent Document 1 discloses a heat-insulating and waterproof structure in which a metal roof base material, a heat-insulating material, and a rubber sheet are bonded and fixed with an adhesive (see FIG. 4 of the present application). The effect of this invention is described as being that it can provide a heat-insulating and waterproof structure that is more reliable in terms of resisting wind loads during strong winds. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-122370 A [Patent Document 2] Japanese Patent Application Publication No. 7-26665 [Patent Document 3] Japanese Patent Application Publication No. 9-125608 Summary of the Invention [Problem to be solved by the invention]

[0006] However, such a conventional heat-insulating and waterproof structure (see FIG. 4) has the following problems. First, since the insulation material is only attached to the convex parts (parts that protrude upward) of the metal roofing underlayment, it is difficult to increase wind pressure resistance (wind load resistance). Secondly, because the recesses in the metal roofing underlayment are hollow, there is a risk that if a person places their foot on it, they will step through the insulation (causing the insulation to buckle). Measures are particularly needed because workers need to walk on the roof during insulation processing work. Thirdly, the recesses in the metal roofing underlayment are hollow, which means that they do not provide sufficient insulation, and there is a risk of condensation forming and causing water leaks.

[0007] In response to these problems, Patent Document 2 discloses a method for insulating and waterproofing a metal roof, which comprises: fitting a synthetic resin foam having a fitting portion of the same shape as the recess of the metal roof and a height equal to or greater than the protrusion of the metal roof into the recess of the metal roof, injecting a urethane foam concentrate into the space surrounded by the protrusion of the metal roof and the synthetic resin foam to form a urethane foam layer flush with the upper surface of the synthetic resin foam, and covering the upper surfaces of the synthetic resin foam and the urethane foam layer with a waterproof sheet member. The effects of the invention are described as being extremely high insulating effect, and easy construction since the urethane foam layer can be formed by the on-site foaming method.

[0008] Patent Document 3 discloses a structure in which heat insulating and sound insulating materials are fitted and filled on the concave surface of a metal folded plate, a base board (plywood) is placed on the folded plate, and an outer plate made of a metal plate is laid on the base board. The effect of the invention is described as being that the corrugated folded plate can be made flat, allowing workers to easily walk on the outer plate.

[0009] Therefore, the object of the present invention is to provide a metal roof insulation waterproof structure and a metal roof insulation waterproof construction method which improve wind pressure resistance, prevent the waterproof base board from being pierced when walking on a metal roof, improve insulation properties while also making condensation less likely to occur. [Means for solving the problem]

[0010] The present invention relates to a metal roof having projections and recesses, A waterproof base board is fixed to the protruding portion so as to cover the recessed portion of the metal roof; A urethane foam is sprayed onto the recessed portion of the metal roof to fill the recessed portion; A waterproof layer is bonded to the surface of the waterproof base board.

[0011] According to the above configuration, the urethane foam sprayed onto the recessed portion of the metal roof acts as an adhesive, increasing the adhesive strength between the metal roof and the waterproof base board, thereby improving wind pressure resistance. In addition, by filling the recessed areas with urethane foam, workers can be prevented from stepping through the waterproof base board when walking on the metal roof. In addition, filling the recessed areas with urethane foam improves insulation, and since there are no hollow spaces, condensation is less likely to occur, preventing water leakage and corrosion.

[0012] The present invention also provides the above-mentioned metal roof insulation and waterproof structure, The urethane foam may be foamed when sprayed, so that the urethane foam is integrally bonded to the recessed portion and the waterproof base board.

[0013] According to the above-mentioned configuration, the self-adhesiveness of the urethane foam allows the recessed portion of the metal roof and the waterproof base board to be integrally bonded. In addition, since the urethane foam is filled between the recessed portion of the metal roof and the waterproof base board, the filling condition can be visually confirmed, and the urethane foam can be used without waste.

[0014] The present invention also provides the above-mentioned metal roof insulation and waterproof structure, The urethane foam may be a rigid urethane foam having an expansion ratio of 10 to 50 times.

[0015] If the expansion ratio of the urethane foam is less than 10 times, the heat insulating properties will decrease, and if it exceeds 50 times, there is a risk of the strength decreasing. Therefore, by adopting the above-mentioned configuration, it is possible to obtain a metal roof insulation and waterproof structure that has a good balance between insulation properties and strength.

[0016] The present invention also provides the above-mentioned metal roof insulation and waterproof structure, The density of urethane foam is 7 to 50 kg / m 3 The range may be:

[0017] According to the above configuration, it is possible to prevent workers from stepping through the waterproof base board when walking on the metal roof, while ensuring light weight.

[0018] In addition, the present invention includes a waterproof base board fixing step of fixing a waterproof base board to the convex portion so as to cover the concave portion of the metal roof having an unevenness; After the waterproof base board fixing process, a urethane foam filling process is performed in which urethane foam is sprayed onto the recessed portion of the metal roof to fill it therein, and the recessed portion and the waterproof base board are integrally bonded together by foaming when sprayed. This is a metal roof insulation waterproofing method, which is characterized by including a waterproofing process of joining a waterproof layer to the surface of the waterproof base board.

[0019] According to the above method, after fixing the waterproof base board to the convex part so as to cover the concave part of the metal roof, the polyurethane foam is sprayed and filled in the concave part of the metal roof, so that the concave part of the metal roof and the waterproof base board can be integrally bonded by the self-adhesiveness of the polyurethane foam. Also, since the polyurethane foam is filled between the concave part of the metal roof and the waterproof base board, the filling condition can be visually confirmed, so the polyurethane foam can be used without waste. In addition, in Patent Document 2, it is necessary to prepare a synthetic resin foam with a fitting portion of the same shape as the recessed portion of the metal roof, which increases the number of steps and causes problems such as gaps easily occurring between the metal roof and the synthetic resin foam. In contrast, in the above method, the recessed portion and the waterproof base board can be filled without gaps simply by spraying urethane foam, which reduces the number of steps and prevents condensation from occurring.

[0020] The present invention also provides a method for spraying and filling urethane foam into the recessed portions of a metal roof having projections and recesses; a scraping step of scraping off the urethane foam protruding from the recessed portion after the urethane foam filling step; A waterproof base board fixing process for fixing a waterproof base board to the convex portion so as to cover the urethane foam filled in the concave portion; This is a metal roof insulation waterproofing method, which is characterized by including a waterproofing process of joining a waterproof layer to the surface of the waterproof base board.

[0021] According to the above method, after spraying and filling the recessed parts of the metal roof with urethane foam, the urethane foam that protrudes from the recessed parts is scraped off, and then the waterproof base board is fixed to the convex parts so as to cover the urethane foam filled in the recessed parts, so that the waterproof base board can be fixed after confirming that the urethane foam has been completely filled in the recessed parts. This allows the work to be carried out while making sure that there are no gaps in the recessed parts of the metal roof. Effect of the Invention

[0022] To provide a metal roof insulation waterproof structure and a metal roof insulation waterproof construction method which improve wind pressure resistance, prevent a waterproof base board from being pierced when walking on a metal roof, improve heat insulation and make condensation less likely to occur. [Brief description of the drawings]

[0023] [Figure 1] 1 is an explanatory diagram of a metal roof insulation waterproof structure according to an embodiment. FIG. [Diagram 2] This is an explanatory diagram of the metal roof insulation waterproofing method (part 1). [Diagram 3] This is an explanatory diagram of the metal roof insulation waterproofing method (part 2). [Figure 4] FIG. 1 is an explanatory diagram of a conventional heat insulating and waterproof structure for a metal roof. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] (Embodiment) In this embodiment, an example of a metal roof insulation and waterproof structure 10 on a metal roof 1 produced by processing a metal plate and a metal roof insulation and waterproof construction method for forming the metal roof insulation and waterproof structure 10 will be described.

[0025] (Metal roof insulation waterproof structure 10) As shown in Figure 1, the metal roof insulation waterproof structure 10 comprises a metal roof 1 having a plurality of recesses 11 (corresponding to recessed portions) and a plurality of protrusions 12 (corresponding to protruding portions) arranged alternately in the width direction, a rigid insulation material 2 (corresponding to a waterproof base board) fixed to the plurality of protrusions 12 so as to cover the plurality of recesses 11 of the metal roof 1, urethane foam 3 sprayed and filled into each recess 11 of the metal roof 1, and a waterproof sheet 4 (corresponding to a waterproof layer) joined to the surface of the rigid insulation material 2.

[0026] (Metal Roof 1) The metal roof 1 of this embodiment is a folded-plate roof made by processing a metal sheet so that recesses 11 formed as grooves in the vertical direction (parallel to the roof slope) and protrusions 12 formed as vertical peaks are arranged alternately in the width direction (wave-shaped). The metal roof 1 is not particularly limited as long as it is a metal roof made by processing a metal sheet, and may be a tiled roof. A tiled roof has multiple ribs (tile bars) extending vertically, and when a heat insulating material is laid on top of these ribs, a cavity is created between the metal roof and the heat insulating material, just like the folded plate roof of this embodiment.

[0027] (Hard insulation material 2) The rigid heat insulating material 2 is in the form of a board, and is fixed to the surface of the top of each of the protruding portions 12 of the metal roof 1 by adhesive 5 .

[0028] As the rigid heat insulating material 2, a foamed plastic heat insulating material as specified in JISA9521:2022 (heat insulating material for construction) can be used, and among them, a rigid urethane foam heat insulating material is preferable. The rigid heat insulating material 2 of this embodiment is formed by a rigid polyurethane foam. The rigid polyurethane foam forming the rigid heat insulating material 2 is a foam with excellent heat insulating properties in which a large number of fine bubbles are contained in polyurethane, which is the matrix portion, by mixing a polyisocyanate having two or more isocyanate groups, a polyol having two or more hydroxyl groups, a foaming agent, etc. The matrix portion forming the rigid polyurethane foam may be formed only of polyurethane, or may be a mixture with other synthetic resins other than polyurethane. However, in order not to impair the properties of the rigid polyurethane foam, such as strength and heat insulating properties, the proportion of polyurethane in the entire rigid polyurethane foam is preferably 50% by mass or more.

[0029] In order to improve strength and heat insulation, the cells in the rigid polyurethane foam are preferably closed cells.

[0030] The density of the rigid insulation material 2 is 10 to 60 kg / m 3 is preferably in the range of 30 to 50 kg / m 3 range, and even 35-45kg / m 3In addition, when priority is given to the light weight of the rigid heat insulating material 2, the density of the rigid heat insulating material 2 is preferably in the range of 15 to 30 kg / m 3 In particular, the range of 20-25 kg / m 3 The range may be as low as 100 nm. The thermal conductivity of the rigid thermal insulator 2 is preferably about 0.01 to 0.06 W / (m·K) (more preferably about 0.02 to 0.04 W / (m·K)).

[0031] As the foam molding method, an extrusion foam molding method or a bead foam molding method can be used. The foaming ratio is preferably about 10 to 50 times, for example. If the foaming ratio is less than 10 times, the heat insulating property may decrease, and if it exceeds 50 times, the strength may decrease. The thickness of the rigid heat insulating material 2 is preferably about 5 to 100 mm, more preferably about 10 to 50 mm, and further preferably about 25 to 45 mm. If the thickness is less than 5 mm, the heat insulating property and strength may decrease, and if it exceeds 100 mm, the light weight may be impaired.

[0032] Furthermore, the rigid heat insulating material 2 is not limited to being made of rigid polyurethane foam. The rigid heat insulating material 2 may be made of a foam sheet other than rigid polyurethane foam, such as polyethylene foam, polystyrene foam, polyisocyanurate foam, or phenol foam.

[0033] In addition, the rigid insulation material 2 may be provided with a facing material (a moisture-permeable facing material such as nonwoven fabric, or a non-moisture-permeable facing material such as a resin film) on the surface of the foam base material for the purpose of protecting the base material and improving workability.

[0034] In addition, in this embodiment, as described above, a hard foamed resin (hard insulating material 2) is used as the waterproof base board, but a hard foamed resin does not have to be used. That is, as long as it can be used as a base for the waterproof sheet 4 (waterproof layer), a resin board (polyethylene, polypropylene, PET, ABS, polycarbonate, acrylic, nylon, polyvinyl chloride, etc.) or a wooden board (plywood, plywood, etc.) may be used. In this way, even if a resin board or a wooden board is used as the waterproof base board, the recesses 11 of the metal roof 1 are filled with urethane foam, so that sufficient thermal insulation can be ensured.

[0035] The adhesive 5 is a solvent-based adhesive, a water-based adhesive, a solventless adhesive that hardens by chemical reaction, etc. Specific examples include adhesives in which chloroprene rubber, butyl rubber, etc. are dissolved in a solvent, polyurethane-based adhesives, modified silicone-based adhesives, epoxy-based adhesives, etc. Among these adhesives, it is preferable to use a solvent-based adhesive, in particular a chloroprene rubber-based adhesive, a butyl rubber-based adhesive, or a polyurethane-based adhesive, in terms of excellent adhesive strength and workability.

[0036] (Urethane foam 3) The urethane foam 3 may be either a rigid urethane foam having an expansion ratio of 50 times or less (particularly about 30 times) or a flexible urethane foam having an expansion ratio of more than 50 times (particularly about 100 times). In this regard, from the viewpoint of improving strength and heat insulation, rigid urethane foam is preferred. In this case, rigid urethane foam having an expansion ratio of 10 to 50 times is more preferred. If the expansion ratio is less than 10 times, the heat insulation may decrease, and if it exceeds 50 times, the strength may decrease. Also, from the viewpoint of cost and workability, flexible urethane foam is preferred. In this embodiment, the urethane foam 3 is a rigid polyurethane foam similar to that used for the rigid thermal insulation material 2.

[0037] The density of the urethane foam 3 is 7 to 50 kg / m 3 is preferably in the range of 15 to 40 kg / m 3 range, and even 20-30kg / m3 The range is preferably: The density of urethane foam 3 is 7kg / m 3 If the density of the urethane foam 3 is lower than 50 kg / m, the effect of preventing a worker from stepping through the rigid insulation material 2 when walking on the metal roof 1 may not be obtained. 3 If it is higher than this, the metal roof heat insulating and waterproof structure 10 may become too heavy, which may impair its lightweight nature.

[0038] The thermal conductivity of the urethane foam 3 is preferably in the range of 0.010 to 0.060 W / (m·K), more preferably in the range of 0.015 to 0.040 W / (m·K), and further preferably in the range of 0.020 to 0.035 W / (m·K).

[0039] Examples of urethane foam 3 satisfying the above conditions include "Achilles Airlon (registered trademark)" manufactured by Achilles Corporation, "Foamlite (registered trademark)" manufactured by BASF INOAC Polyurethanes Co., Ltd., "Soflan (registered trademark)" manufactured by Sekisui Soflan With Co., Ltd., and "Clarafoam (registered trademark)" manufactured by Kurabo Industries Co., Ltd.

[0040] The polyurethane foam 3 is sprayed into each recess 11 of the metal roof 1 by fixing the rigid insulation material 2 to each protrusion 12 of the metal roof 1 and then spraying it into the recess 11 (the hollow space between the recess 11 of the metal roof 1 and the rigid insulation material 2) to fill it (see the metal roof insulation waterproofing method (part 1) described below). That is, the urethane foam 3 is foamed when sprayed, and is integrally bonded to the recess 11 of the metal roof 1 and the rigid insulating material 2.

[0041] In addition, after spraying the urethane foam 3 into the recesses 11 of the metal roof 1, the urethane foam 3 that protrudes above the protrusions 12 of the metal roof 1 can be scraped off to flatten the surface, and then the rigid insulation material 2 can be fixed to each protrusion 12 (see the metal roof insulation waterproofing method (part 2) described below).

[0042] Among these, the former method is preferable from the viewpoint of reducing waste of the material of the urethane foam 3, since the self-adhesiveness of the urethane foam 3 allows the recess 11 of the metal roof 1 and the rigid insulation material 2 to be integrally bonded, and the urethane foam 3 is filled between the recess 11 of the metal roof 1 and the rigid insulation material 2, allowing visual confirmation of the degree of filling. In particular, in Patent Document 2, it is necessary to prepare a synthetic resin foam having a fitting portion having the same shape as the recess of the metal roof, which increases the number of steps and has the problem that gaps are likely to occur between the metal roof and the synthetic resin foam. In contrast, in this embodiment, the urethane foam 3 as an insulation material can be filled into the recess 11 without any gaps simply by spraying the urethane foam 3, thereby reducing the number of steps and preventing condensation.

[0043] In the former method, if one attempts to spray urethane foam 3 after fixing rigid insulation material 2 to each convex portion 12 of metal roof 1, it may be difficult to fill urethane foam 3 deep into concave portion 11. Therefore, it is preferable to lay rigid insulation material 2 measuring, for example, 910 mm x 1820 mm continuously in the width direction, then spray urethane foam 3 into concave portion 11 (the hollow portion between concave portion 11 of metal roof 1 and rigid insulation material 2), and thereafter repeat the laying of rigid insulation material 2 and spraying of urethane foam 3 in the same manner. Moreover, it is preferable that the rigid heat insulating material 2 is laid on each of the protruding portions 12 of the metal roof 1 without leaving any gaps.

[0044] (Tarp 4) The waterproof sheet 4 is formed of rubber (vulcanized rubber, cross-linked rubber), elastomer (thermosetting elastomer, thermoplastic elastomer), synthetic resin, etc. More specifically, EPDM (ethylene-propylene-diene terpolymer), IIR (butyl rubber), NR (natural rubber), SBR (styrene-butadiene rubber), CR (chloroprene rubber), NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber), CSM (chlorosulfonated polyethylene), polyethylene, polypropylene, PVC (polyvinyl chloride), EVA (ethylene-vinyl acetate copolymer), etc. The waterproof sheet 4 may be a single sheet integrally molded, or may be a sheet formed by bonding multiple sheets. The thickness of the waterproof sheet 4 is preferably 1.0 to 2.5 mm. If the thickness is less than 1.0 mm, the strength may be insufficient. On the other hand, a thickness of more than 2.5 mm is not preferable because it results in a large step at the joint when multiple waterproof sheets 4 are stacked and connected, which leads to poor drainage and poor design. The waterproof sheet 4 may be made of the above-mentioned rubber, elastomer, or synthetic resin sheet with a reinforcing cloth made of glass fiber, polyester fiber, or the like embedded therein to improve mechanical strength and dimensional stability. In this embodiment, the waterproof sheet 4 is an EPDM sheet having a thickness of 1.0 mm.

[0045] In this embodiment, the waterproof sheet 4 is used as the waterproof layer, but paint film waterproofing or asphalt waterproofing may also be used.

[0046] According to the metal roof insulation waterproof structure 10 configured as described above, the urethane foam 3 sprayed into the recess 11 of the metal roof 1 acts like an adhesive, increasing the adhesive strength between the metal roof 1 and the rigid insulation material 2 and improving wind pressure resistance. Furthermore, by filling the recesses 11 with the urethane foam 3, it is possible to prevent workers from stepping through the rigid insulating material 2 when walking on the metal roof 1. Furthermore, by filling the recesses 11 with the urethane foam 3, the heat insulation is improved, and since there are no cavities, condensation is less likely to occur, making it possible to prevent water leakage and corrosion.

[0047] (Metal roof insulation and waterproofing method: Part 1) Next, a metal roof insulation and waterproofing construction method (part 1) for forming the metal roof insulation and waterproofing structure 10 according to this embodiment will be described.

[0048] (1: Waterproof base board fixing process) First, as shown in Fig. 2(A), in a metal roof 1 in which recesses 11 formed as vertical grooves and protrusions 12 formed as vertical mountains are alternately arranged in the width direction, adhesive 5 is applied to the surface of the top of each protrusion 12. Then, rigid insulation material 2 (corresponding to a waterproof base board) is installed so as to cover each recess 11, and each protrusion 12 of the metal roof 1 and the rigid insulation material 2 are fixed with adhesive 5.

[0049] In this embodiment, the rigid insulation material 2 and each convex portion 12 of the metal roof 1 are fixed together with an adhesive 5, but the rigid insulation material 2 and each convex portion 12 of the metal roof 1 may also be fixed together with a mechanical fixing method using screws, bolts, anchors, fixing disks, etc.

[0050] (2: Urethane foam filling process) Next, as shown in FIG. 2(B), urethane foam 3 is sprayed to fill each recess 11 (the hollow portion between the recess 11 and the rigid insulation material 2) of the metal roof 1, and the foaming that occurs when the foam is sprayed bonds each recess 11 and the rigid insulation material 2 together.

[0051] (3: Waterproofing process) Next, as shown in Figure 2(C), the waterproof sheet 4 is joined to the surface of the rigid insulation 2 by "applying adhesive to the entire surface of the rigid insulation 2, and then superimposing the waterproof sheet 4," "applying adhesive to the entire back surface of the waterproof sheet 4, and then superimposing the waterproof sheet 4 on the surface of the rigid insulation 2," or "applying adhesive to both the entire surface of the rigid insulation 2 and the entire back surface of the waterproof sheet 4, and then superimposing the waterproof sheet 4 on the surface of the rigid insulation 2." In addition to applying adhesive to the backside of the waterproof sheet 4 on-site, a waterproof sheet 4 with glue or an adhesive layer may also be used (the release paper protecting the adhesive layer is peeled off on-site before use).

[0052] In the above embodiment, the waterproof sheet 4 and the rigid insulation material 2 are joined by an adhesive (adhesive method), but a mechanical fixing method may also be used in which fixed disks are placed at predetermined intervals on the surface of the rigid insulation material 2 and the waterproof sheet 4 is fixed to the fixed disks placed at predetermined intervals by heat fusion. Of these, the adhesive method is preferred because it is less likely to cause steps at the joint between the waterproof sheet 4 and the rigid insulation material 2, and the adhesive method in which an adhesive is applied to the entire surface of the waterproof sheet 4 is preferred from the viewpoint of improving adhesive strength (wind pressure resistance).

[0053] Through the above steps, the metal roof heat insulating and waterproof structure 10 is formed.

[0054] According to the above construction method, the rigid insulation material 2 is fixed to the protrusion 12 so as to cover the recess 11 of the metal roof 1, and then the urethane foam 3 is sprayed and filled into the recess 11 of the metal roof 1, so that the recess 11 of the metal roof 1 and the rigid insulation material 2 can be integrally bonded by the self-adhesiveness of the urethane foam 3. Furthermore, since the urethane foam 3 is filled between the recess 11 of the metal roof 1 and the rigid insulation material 2, the degree of filling can be visually confirmed, and therefore the urethane foam 3 can be used without waste.

[0055] Furthermore, in Patent Document 2, it is necessary to prepare a synthetic resin foam having a fitting portion of the same shape as the recess 11 of the metal roof 1, which increases the number of steps and causes problems such as gaps easily occurring between the metal roof 1 and the synthetic resin foam. In contrast, in the above-mentioned method, the urethane foam 3 can be filled without gaps between the recess 11 and the rigid insulation material 2 simply by spraying it, which reduces the number of steps and prevents condensation from occurring.

[0056] (Metal roof insulation and waterproofing method: Part 2) Next, a second method for forming a metal roof insulation and waterproof structure 10 using a different procedure from the first method for forming a metal roof insulation and waterproof structure 10 will be described.

[0057] (1: Urethane foam filling process) First, as shown in FIG. 3(A), urethane foam 3 is sprayed into each recess 11 of a metal roof 1 to fill it.

[0058] (2: Scraping process) Next, as shown in Fig. 3(B), after the urethane foam filling step, excess portions 31 (see Fig. 3(A)) of the urethane foam 3 that protrude from each recess 11 beyond the top surfaces of the protrusions 12 are scraped off. As a result, the upper surfaces of the urethane foam 3 filled in the recesses 11 and the top surfaces of the protrusions 12 become flush with each other, resulting in a flat shape.

[0059] (3: Waterproof base board fixing process) Next, as shown in Fig. 3(C), adhesive 5 is applied to the surface of the peak of each protrusion 12 of the metal roof 1. Then, rigid insulation material 2 (corresponding to a waterproof base board) is installed so as to cover the urethane foam 3 filled in each recess 11, and each protrusion 12 of the metal roof 1 and the rigid insulation material 2 are fixed with adhesive 5. In addition, by interposing (applying) an adhesive between the upper surface of the urethane foam 3, which has been flattened in the scraping process, and the rigid insulation material 2, the adhesive strength between the urethane foam 3 and the rigid insulation material 2 can be increased, thereby improving wind pressure resistance.

[0060] (4: Waterproofing process) Next, as shown in Figure 3 (C), adhesive is applied to the entire surface of the rigid insulation 2 and then a waterproof sheet 4 is laid over it, or adhesive is applied to the entire back surface of the waterproof sheet 4 and then the waterproof sheet 4 is laid over the surface of the rigid insulation 2, thereby joining the waterproof sheet 4 to the surface of the rigid insulation 2.

[0061] Through the above steps, the metal roof heat insulating and waterproof structure 10 is formed.

[0062] According to the above method, after the urethane foam 3 is sprayed and filled into the recess 11 of the metal roof 1, the excess 31 of the urethane foam 3 protruding from the recess 11 is scraped off, and then the rigid insulation material 2 is fixed to the protrusion 12 so as to cover the urethane foam 3 filled in the recess 11, so that after it is confirmed that the urethane foam 3 is securely filled in the recess 11, the rigid insulation material 2 can be fixed to the metal roof 1. This allows the work to be carried out while checking that the urethane foam 3 is securely filled in the recess 11 of the metal roof 1 without any gaps. [Explanation of symbols]

[0063] 1. Metal roof 11 Recess 12 Convex part 2. Rigid insulation 3. Urethane foam 4. Tarpaulin 5. Glue 10. Metal roof insulation and waterproofing structure

Claims

1. A metal roof having projections and recesses; A waterproof base board is fixed to the protruding portion so as to cover the recessed portion of the metal roof; A urethane foam is sprayed onto the recessed portion of the metal roof to fill the recessed portion; A metal roof insulation waterproof structure comprising: a waterproof layer joined to the surface of the waterproof base board.

2. 2. The metal roof insulation waterproof structure according to claim 1, wherein the urethane foam is foamed when sprayed and is integrally bonded to the recessed portion and the waterproof base board.

3. 3. The metal roof insulation waterproof structure according to claim 1, wherein the urethane foam is a hard urethane foam having an expansion ratio of 10 to 50 times.

4. The urethane foam has a density of 7 to 50 kg / m 3 The metal roof heat insulation and waterproof structure according to claim 1 or 2, characterized in that the range of

5. A waterproof base board fixing process for fixing a waterproof base board to the convex portion so as to cover the concave portion of the metal roof having an unevenness; After the waterproof base board fixing process, a urethane foam filling process is performed in which urethane foam is sprayed onto the recessed portion of the metal roof to fill it therein, and the recessed portion and the waterproof base board are integrally bonded together by foaming when sprayed. A metal roof insulation waterproofing method comprising: a waterproofing step of bonding a waterproof layer to the surface of the waterproof base board.

6. A urethane foam filling step of spraying urethane foam onto the recessed portions of the metal roof having projections and recesses to fill them; a scraping step of scraping off the urethane foam protruding from the recessed portion after the urethane foam filling step; A waterproof base board fixing process for fixing a waterproof base board to the convex portion so as to cover the urethane foam filled in the concave portion; A metal roof insulation waterproofing method comprising: a waterproofing step of bonding a waterproof layer to the surface of the waterproof base board.

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