Roof structure

Abstract

To provide a roof structure that is less prone to loss of roofing material attachment strength.SOLUTION: A roof structure 1 is equipped with a roof base plate 2, a roofing material 3, and an adhesive section 4. The roof base plate 2 includes a sandwich panel with a core material 22 placed between two metal outer shells 21. The roofing material 3 has a metal roofing material body 31 and an adhesive layer 32 provided on the underside of the roofing material body 31. The roofing material 3 is positioned above the roof base plate 2. The adhesive layer 32 is a rubber or resin containing coating. The adhesive section 4 is disposed between the roof base plate 2 and the roofing material 3. The adhesive layer 32 is adhered to the adhesive section 4 and the adhesive section 4 is adhered to the roof base plate 2, to secure the roofing material 3 to the roof base plate 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates generally to roof structures, and more particularly to roof structures comprising roof underlayments and roofing materials. [Background technology]

[0002] Patent Document 1 describes a flat roofing material. A plurality of these flat roofing materials are arranged on the top surface of the sheathing boards, and the flat roofing materials are fixed to the sheathing boards with metal fixing nails. In this case, the fixing nails are driven from the top surface of the flat roofing materials to the sheathing boards. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-231586 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the structure described in Patent Document 1 had the problem that the fixing nails were easily exposed to wind and rain and deteriorated due to corrosion, which reduced the strength of the fixing nails themselves and caused deterioration around the nail holes in the flat roofing material, making it easy for the fixing strength of the flat roofing material to decrease.

[0005] The present disclosure aims to provide a roof structure in which the fixing strength of the roofing material is less likely to decrease. [Means for solving the problem]

[0006] A roof structure according to one aspect of the present disclosure includes a roof underlayment, a roofing material, and an adhesive portion, the roof underlayment including a sandwich panel having a core material disposed between two metal skins, the roofing material having a metal roofing material body and an adhesive layer provided on the underside of the roofing material body, and being disposed above the roof underlayment, the adhesive layer including rubber or resin. and a paint containing asphalt, urethane polymer, and calcium chloride.The adhesive layer is a coating film, and the adhesive portion is arranged between the roof underlayment and the roofing material, and the roofing material is fixed to the roof underlayment by adhering the adhesive layer to the base material and the adhesive layer to the roof underlayment. [Effects of the Invention]

[0007] According to the present disclosure, the roofing material is fixed to the roofing underlayment by the adhesive portion disposed between the roofing underlayment and the roofing material, so the adhesive portion is less likely to be exposed to wind and rain and is less likely to deteriorate, which has the advantage that the fixing strength of the roofing material by the adhesive portion is less likely to decrease. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are perspective and cross-sectional views of a roof structure according to a first embodiment of the present disclosure. [Figure 2] Fig. 2A is a perspective view showing a roof underlayment board of a roof structure according to the present disclosure, and Figs. 2B and 2C are cross-sectional views showing the same in an installed state. [Figure 3] Fig. 3A is a perspective view showing a roof material of embodiment 1 of the roof structure according to the present disclosure, and Figs. 3B to 3D are perspective views showing other examples of the same roof material. [Figure 4] Fig. 4A is a cross-sectional view showing an adhesive portion of the roof structure according to embodiment 1. Fig. 4B is a cross-sectional view showing an adhesive portion of a modified example of the roof structure according to the present disclosure. [Figure 5] Fig. 5A is a plan view showing a roof material of embodiment 1 of the roof structure according to the present disclosure, and Figs. 5B and 5C are cross-sectional views showing the same roof material. [Figure 6] Fig. 6A is a perspective view showing a roof structure using the roofing materials of Fig. 5A to C. Fig. 6B is a cross-sectional view showing the state in which the hooking portion of the roofing material and the hook receiving portion are hooked. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment 1) The roof structure 1 according to this embodiment comprises a roof underlayment 2, a roofing material 3, and an adhesive part 4 (see FIG. 1A). The roof structure 1 according to this embodiment is applicable to buildings such as houses, factories, stores, gymnasiums, and halls, and is particularly suitable for use in medium-sized buildings.

[0010] The roof structure 1 has multiple roof underlayment boards 2. The multiple roof underlayment boards 2 are arranged in the eaves-ridge direction and in a direction perpendicular to the eaves-ridge direction. The roof underlayment boards 2 are installed vertically or horizontally. Here, the eaves-ridge direction is equivalent to the slope direction of the roof, and the direction indicated by arrow X1 in Figure 1A is the ridge direction, and the direction opposite to arrow X1 is the eaves direction. The direction perpendicular to the eaves-ridge direction is the direction perpendicular to the eaves-ridge direction on the roof surface (for example, the eaves direction), and the direction indicated by arrow Y1 in Figure 1A is the rightward direction, and the direction opposite to arrow Y1 is the leftward direction. The direction indicated by arrow Z1 in Figure 1A is the upward direction, which is perpendicular to the roof surface. The direction opposite to arrow Z1 is the downward direction.

[0011] As shown in FIG. 2A, the roof underlayment 2 is a sandwich panel in which a core material 22 is placed between two metal skins 21. The metal skins 21 are formed into a desired shape by rolling or pressing a metal plate. The metal plate has a thickness of, for example, about 0.25 to 1.6 mm. The metal plate may be a painted steel plate, a zinc-plated steel plate, an aluminum-zinc alloy-plated steel plate, a Galvalume steel plate (registered trademark), an SGL (registered trademark) steel plate, a stainless steel plate, a copper plate, an aluminum plate, a titanium plate, a zinc alloy plate, or the like, but is not limited to these.

[0012] The core material 22 is a resin foam, a fibrous inorganic material, or a combination thereof, and has heat insulating properties and fire resistance. The resin foam has a density of, for example, 40 to 60 kg / m 3Examples of the fibrous inorganic material include polyisocyanurate foam, urethane foam, and phenol foam. The fibrous inorganic material is, for example, a plurality of blocks of rock wool or glass wool bound with a binder or the like, arranged in the form of a single plate. The core material 22 is attached to the metal skin 21 by, for example, adhesive. The core material 22 may be a combination of a layer of fibrous inorganic material and a layer of resin foam laminated in the thickness direction of the sandwich panel (the direction in which the two metal skins 21 face each other). Furthermore, among the core materials 22, a fire-resistant core material having higher fire resistance than the fibrous inorganic material or resin foam may be used for the core material located at the peripheral edge of the sandwich panel. In this case, the fire-resistant core material is, for example, an inorganic material such as gypsum board or calcium silicate board. Rock wool, which has excellent heat insulation properties, is preferably used for the core material 22, and in this case, the thickness is preferably 35 to 50 mm.

[0013] The roof underlayment board 2 is a substantially rectangular plate in plan view (seen from above). In this embodiment, it is arranged in a so-called vertical installation, with the eaves-ridge direction being the longitudinal direction (length direction) of the roof underlayment board 2 and the girder direction being the transverse direction (width direction). The roof underlayment board 2 may also be arranged horizontally. The roof underlayment board 2 has a mating protrusion 23 at its right end and a mating recess 24 at its left end. The mating protrusion 23 and mating recess 24 are provided along the longitudinal direction at the end of the roof underlayment board 2 in the girder direction. A gasket such as rock wool felt is arranged at the bottom of the mating recess 24. The roof underlayment board 2 has a length in the eaves-ridge direction of, for example, 3635 mm and a width in the girder direction of, for example, 910 mm, but other sizes are also possible.

[0014] The roof underlayment 2 is arranged spanning multiple support members 5. Support members 5 include, for example, purlins, rafters, and beams in a wooden building. The multiple support members 5 are arranged side by side at a predetermined interval along the eaves-ridge direction. Each support member 5 is arranged to extend along the girder direction. One roof underlayment 2 is arranged spanning at least two adjacent support members 5. For example, C-beams, H-beams, I-beams, etc. are used as support members 5.

[0015] Two adjacent roof underlayment boards 2 in the girder direction are connected by fitting their mating convex portions 23 and mating concave portions 24 together, as shown in Figure 2B. Two adjacent roof underlayment boards 2 in the eaves-ridge direction are installed by butting their ends together with a packing material such as rock wool felt interposed between them, as shown in Figure 2C. Two adjacent roof underlayment boards 2 in the eaves-ridge direction may also be butted together directly without using a sealant. Each roof underlayment board 2 is fixed at multiple points to multiple support members 5 using fasteners 6 such as drill screws, and is installed in a state where it spans multiple support members 5 adjacent in the eaves-ridge direction.

[0016] A base treatment material 7 is provided on the upper surface of the roof underlayment 2. The base treatment material 7 can be formed, for example, as a 0.5 to 2 mm coating on the upper surface of the metal skin 21 (the surface not facing the core material 22) that constitutes the upper surface of the roof underlayment 2. The base treatment material 7 is preferably formed so as to cover the entire upper surface of the roof underlayment 2. The base treatment material 7 is provided for purposes such as correcting unevenness on the upper surface of the roof underlayment 2, improving adhesion between the upper surface of the roof underlayment 2 and the adhesive layer 42, and improving the waterproofing of the roof. The base treatment material 7 can be formed from a primer material including, for example, a butyl rubber-based base treatment material (or treatment layer), an acrylic resin-based base treatment material (or treatment layer), a urethane resin-based base treatment material (or treatment layer), a silicone resin-based base treatment material (or treatment layer), or a styrene-butadiene resin-based base treatment material (or treatment layer). One or more types of primer materials can be used.

[0017] The adhesive portion 4 is disposed above the roof underlayment 2. Since a base treatment material 7 is formed on the upper surface of the roof underlayment 2, the adhesive portion 4 is provided in contact with the upper surface of the base treatment material 7. As shown in FIG. 4A, the adhesive portion 4 can be an adhesive material having adhesive layers 42 provided on both the upper and lower surfaces of a substrate 41. The adhesive portion 4 can have a thickness of 0.5 to 2.0 mm, and preferably 0.8 to 1.5 mm.

[0018] The substrate 41 is preferably flexible, and may be made of, for example, a rubber sheet or a vinyl chloride sheet. Among rubber sheets, a butyl rubber sheet is preferred because of its excellent weather resistance and adhesiveness. Alternatively, the substrate 41 may be made of, for example, a non-vulcanized butyl rubber sheet with a polyolefin reinforcing layer.

[0019] The adhesive layer 42 on the upper surface of the substrate 41 adheres to the lower surface of the adhesive layer 32 of the roofing material 3. The adhesive layer 42 on the lower surface of the substrate 41 adheres to the upper surface of the base treatment material 7. Here, "adhesion" refers to a type of adhesion, which adheres at room temperature for a short period of time by applying only slight pressure without using water, solvents, or heat. In this embodiment, the adhesive layer 42 adheres to the lower surface of the adhesive layer 32 and the upper surface of the base treatment material 7 primarily due to the weight of the roofing material 3. Furthermore, by pressing the roofing material 3, the adhesive layer 42 adheres to the lower surface of the adhesive layer 32 and the upper surface of the base treatment material 7. The adhesive layer can be formed using one or more types of adhesive materials, such as butyl rubber adhesives, acrylic resin adhesives, silicone resin adhesives, rubber adhesives, urethane adhesives, and styrene-butadiene adhesives. The adhesive layer 42 can be formed by integrating the adhesive material onto the upper and lower surfaces of the substrate 41 by methods such as adhesion, self-adhesion, pasting, and coating. The adhesive layer 42 may be formed using a double-sided adhesive material. The adhesive layer 42 may be formed using a sheet material or tape.

[0020] The adhesive portion 4 is used to adhere and fix the roofing material 3 to the roof underlayment 2. Therefore, in the roof structure 1 according to this embodiment, nails, screws, retaining clips, etc. for fixing the roofing material 3 are not used, or can be used very little. Therefore, holes are not formed in the roofing material 3 and the adhesive portion 4, improving the waterproofing of the roof. Furthermore, the adhesive portion 4 is used to improve the waterproofing of the roof. Therefore, roofing materials such as asphalt roofing do not need to be used, and the reduction in the number of parts allows for cost reduction.

[0021] The roofing material 3 comprises a roofing material body 31 and an adhesive layer 32. The roofing material body 31 is a member that constitutes the upper surface of the roofing material 3 and is made of metal. The roofing material body 31 is formed into a desired shape by rolling or pressing a metal plate. The metal plate has a thickness of, for example, approximately 0.25 to 1.6 mm. The metal plate may be a painted steel plate, a galvanized steel plate, an aluminum-zinc alloy plated steel plate, a Galvalume steel plate (registered trademark), an SGL (registered trademark) steel plate, a stainless steel plate, a copper plate, an aluminum plate, a titanium plate, a zinc alloy plate, or the like, but is not limited to these. In this embodiment, the roofing material body 31 has a hook portion 34 at its eaves side end. The roofing material body 31 also has a hook receiving portion 33 at its ridge side end. The hook portion 34 and the hook receiving portion 33 are formed over substantially the entire length of the roofing material body 31 in the girder direction. The eave side end of the roof material body 31 is the end that faces the eaves side when the roof material 3 is placed above the roof underlayment 2. The ridge side end of the roof material body 31 is the end that faces the ridge side when the roof material 3 is placed above the roof underlayment 2. The girder direction of the roof material body 31 is the direction that is approximately parallel to the girder direction when the roof material 3 is placed above the roof underlayment 2.

[0022] The roofing material body 31 can be formed in various shapes. As shown in Figures 3B and 3C, the roofing material body 31 may further have a hook portion 35 and a hook receiving portion 36 on both side ends approximately parallel to the girder direction. In this case, adjacent roofing materials 3 in a direction parallel to the eaves are connected by hooking the hook portion 35 and the hook receiving portion 36. Alternatively, as shown in Figure 3D, a roofing material for line roofing can be used as the roofing material 3. The roofing material 3 for line roofing has a hook receiving portion 33 and a hook portion 34, as described above, and further has one end of the adhesive layer 32 protruding outward from one end of the roofing material body 31 in the girder direction. A water-stop rubber 37 is provided on the protruding portion of the adhesive layer 32.

[0023] As shown in FIG. 5A, the roofing material 3 for diamond roofing has a roofing material main body 31 that is formed in a diamond shape in a plan view. As shown in FIG. 5B, a hook portion 34 is provided along the entire length of one of the two eave side ends of the roofing material main body 31. Furthermore, a hook receiving portion 33 is provided along the entire length of one of the two ridge side ends of the roofing material main body 31. As shown in FIG. 5C, a hook portion 34 is provided along the entire length of the other of the two eave side ends of the roofing material main body 31. Furthermore, a hook receiving portion 33 is provided along the entire length of the other of the two ridge side ends of the roofing material main body 31. In this way, the hook receiving portion 33 and the hook portion 34 are located on both the left and right sides of the roofing material 3. Furthermore, an adhesive layer 32 is provided on the underside of the roofing material main body 31 and the upper surface of the hook receiving portion 33.

[0024] The adhesive layer 32 is provided on the underside of the roofing material body 31. The adhesive layer 32 is provided on the roofing material 3 to adhere the roofing material body 31 to the substrate 41 of the adhesive portion 4. The adhesive layer 32 has adhesive properties with the substrate 41 and can be formed, for example, from a coating containing rubber or resin. In this case, non-vulcanized rubber can be used as the rubber. Non-vulcanized rubber is preferred because it has higher flexibility and adhesiveness than vulcanized rubber. As the non-vulcanized rubber, non-vulcanized butyl rubber is preferred from the perspective of durability. Examples of resins include acrylic resin, urethane resin, silicone resin, and styrene-butadiene resin. The adhesive layer 32 preferably contains at least one resin selected from the group consisting of non-vulcanized rubber, acrylic resin, urethane resin, and silicone resin. Among these, the adhesive layer 32 preferably contains non-vulcanized rubber, which makes it easier to obtain an adhesive layer 32 with excellent flexibility and adhesiveness.

[0025] The adhesive layer 32 is a coating film containing the above-mentioned rubber or resin. That is, the adhesive layer 32 can be formed by applying a paint in which the above-mentioned rubber or resin is dissolved or dispersed in a solvent to the underside of the roofing material main body 31, and then drying it. When the adhesive layer 32 is a coating film, it is easy to form it with a uniform thickness, and even if the underside of the roofing material main body 32 is uneven, the adhesive layer 32 can easily be formed to follow the uneven surface. The paint for forming the adhesive layer 32 preferably contains 20 to 50 parts by mass of rubber or resin and 50 to 80 parts by mass of solvent. This makes it easy to form a coating film with a uniform thickness. The solvent can be one or more selected from the group consisting of water, toluene, n-hexane, gasoline, and thinner.

[0026] Furthermore, the paint for forming the adhesive layer 32 preferably contains asphalt, a urethane polymer, and calcium chloride. In this case, an adhesive layer 32 with excellent flexibility and adhesiveness is easily obtained. A paint containing these three components preferably contains, for example, 40 to 60 parts by mass of asphalt, 25 to 45 parts by mass of urethane polymer, and 5 to 25 parts by mass of calcium chloride. Since such an adhesive layer 32 has high adhesive strength, the adhesive layer 4 may be omitted. If the adhesive layer 4 is not present, the adhesive layer 32 can also serve as the adhesive layer 4. The asphalt and urethane polymer are liquid, and the calcium chloride is powdered.

[0027] The viscosity of the paint used to form adhesive layer 32 is preferably in the range of 5 to 30 Pa·s (25°C). This makes it easy to apply the paint and to form a coating film of a consistent thickness. The paint used to form adhesive layer 32 can be applied to the underside of roofing material body 31 by, for example, spray coating, roll coating, brush coating, or other methods.

[0028] The thickness of adhesive layer 32 is preferably 0.02 to 5 mm, and more preferably 0.04 to 3 mm. If the thickness of adhesive layer 32 is less than the above-mentioned range, it will be difficult to sufficiently adhere roofing material body 31 to substrate 41, and if the thickness of adhesive layer 32 exceeds the above-mentioned range, roofing material 3 will be too heavy and difficult to install.

[0029] The adhesive layer 32 can be provided over the entire underside of the roofing material body 31. In this case, the entire underside of the roofing material body 31 can be bonded to the substrate 41 by the adhesive layer 32, improving the fixing strength of the roofing material 3. On the other hand, the adhesive layer 32 can also be provided on a portion of the underside of the roofing material body 31. In this case, the adhesive layer 32 can be provided only on the portion of the underside of the roofing material body 31 where the substrate 41 is to be bonded. For example, as shown in FIG. 1B , the adhesive layer 32 may be provided on approximately half of the ridge side of the underside of the roofing material body 31. In this case, approximately half of the ridge side of the underside of the roofing material body 31 is bonded to the substrate 41 of the adhesive portion 4, and approximately half of the eave side of the underside of the roofing material body 31 is separated from the substrate 41 of the adhesive portion 4 and is not bonded. Furthermore, when the adhesive layer 32 is provided on a portion of the underside of the roofing material body 31, the amount of adhesive layer 32 used is reduced, resulting in cost savings. It is preferable that the adhesive layer 32 is provided on the upper surface of the hook receiving portion 33, so that when the hook receiving portion 34 and the hook receiving portion 33 are hooked together, the adhesive layer 32 can bond the hook receiving portion 34 and the hook receiving portion 33 together.

[0030] The roof structure 1 according to this embodiment can be formed as follows. First, multiple roof underlayment boards 2 are placed above the support members 5. In this case, each roof underlayment board 2 is placed across multiple support members 5. Each roof underlayment board 2 is then fixed to the support members 5 with fasteners 6, such as nails or screws. Adjacent roof underlayment boards 2 in the longitudinal direction are connected by fitting their mating recesses 24 into their mating protrusions 23 (see Figure 2B). Adjacent roof underlayment boards 2 in the eaves-ridge direction are connected by butting their ends together. Each support member 5 must be provided with fire-resistant material 51 on its outer surface to improve fire resistance. For fire-resistant buildings under the Building Standards Act, fire-resistant certified materials (e.g., sprayed rock wool) are used as the fire-resistant material 51. It is preferable to seal gaps between adjacent roof underlayment boards 2 with tape material 25, such as aluminum tape, to ensure temporary waterproofing during temporary fastening and fire resistance.

[0031] 1A, a base treatment material 7 is formed on the upper surface of the roof furring board 2. The base treatment material 7 can be formed over the entire upper surface of the roof furring board 2 fixed to the support member 5, but is not limited to this, and the base treatment material 7 may also be formed on only a portion of the roof furring board 2.

[0032] Next, adhesive portion 4 is formed above roof underlayment 2. In this case, if adhesive portion 4 is formed using a sheet-like adhesive material, adhesive portion 4 is formed by laying the sheet-like adhesive material on the upper surface of base treatment material 7. Adhesive portion 4 is formed so that adhesive layer 42 provided on the underside of substrate 41 contacts the upper surface of base treatment material 7. Therefore, substrate 41 of adhesive portion 4 faces upward. Also, adhesive layer 42 provided on the underside of substrate 41 adheres (bonds) to base treatment material 7. Here, if both adhesive layer 42 and base treatment material 7 contain non-vulcanized butyl rubber, the adhesive strength between adhesive layer 42 and base treatment material 7 is increased, thereby improving the fixing strength of roofing material 3 and the wind pressure resistance of roofing material 3.

[0033] Next, as shown in FIG. 1A, multiple roofing materials 3 are placed above the adhesive portion 4. The multiple roofing materials 3 are arranged in a horizontal laying configuration. Therefore, adjacent roofing materials 3 in the eaves-ridge direction are connected by hooking the hook portion 34 of the roofing material 3 on the ridge side onto the hook receiving portion 33 of the roofing material 3 on the eaves side from above, as shown in FIG. 6B. Furthermore, when roofing materials 3 are adjacent in the girder direction, the horizontal ends of the roofing materials 3 are connected by overlapping them vertically.

[0034] 1A, the roofing material 3 is fixed to the roof underlayment 2 by the adhesive portion 4. That is, the adhesive layer 32 on the back surface of the roofing material 3 is adhered to the upper surface of the adhesive portion 4, i.e., to the adhesive layer 42 provided on the upper surface of the base material 41. Here, if both the adhesive layer 42 and the adhesive layer 32 contain non-vulcanized butyl rubber, the adhesive strength between the adhesive layer 42 and the adhesive layer 32 is increased, thereby improving the fixing strength of the roofing material 3 and the wind pressure resistance performance of the roofing material 3. The roofing material 3 is then fixed to the roof underlayment 2 via the adhesive portion 4 and the base treatment material 7, and the roof structure 1 according to this embodiment is formed.

[0035] When using the roofing materials 3 shown in Figures 5A to 5C, multiple roofing materials 3 are laid side by side in the eaves-ridge and girder directions, as shown in Figure 6A. At this time, as shown in Figure 6B, adjacent roofing materials 3 are connected by hooking their hook portions 34 and hook receiving portions 33. Furthermore, each roofing material 3 is adhered to the base treatment material 7 via the adhesive portion 4, as in the case of Figures 1A and 1B.

[0036] In the roof structure 1 according to this embodiment, the roof material 3 is fixed to the roof underlayment 2 by an adhesive portion 4 that is arranged between the roof underlayment 2 and the roof material 3. This makes the adhesive portion 4 less susceptible to exposure to wind and rain, making the adhesive portion 4 less susceptible to deterioration, and making it less likely that the fixing strength of the roof material 3 by the adhesive portion 4 will decrease.

[0037] In the roof structure 1 according to this embodiment, nails, screws, retaining clips, etc. are not used, or are used almost exclusively, to fasten the roofing material 3. This prevents corrosion and loss of strength at the nailed fastening portions of the roofing material, as occurs in the past, and also makes it extremely unlikely that the roofing material 3 will be blown away by a typhoon (strong winds) that exceed the current design strength.

[0038] In the roof structure 1 of this embodiment, the roof underlayment 2, adhesive portion 4, and roof material 3 are integrated into a single structure, which increases strength and enables a purlin spacing that is more than twice as long as that of conventional construction methods (e.g., wood wool cement boards, etc., with a purlin spacing of 606 mm), with 1300 mm being the standard, for example.

[0039] As shown in Figure 1A, the roof structure 1 according to this embodiment includes a roof underlayment 2, an adhesive portion 4, and a roofing material 3, and therefore has excellent fire resistance (non-damage, flame-proof) in terms of the fire resistance performance stipulated in the Building Standards Act. For example, the roof structure 1 according to this embodiment can obtain a 30-minute fire-resistant roof structure certification. Meanwhile, while the fire-resistant specifications for conventional construction methods such as wood wool cement boards, resin foam insulation, and roofing materials stipulate a purlin spacing of 606 mm or less, the roof structure 1 according to this embodiment allows for a purlin spacing specification that is greater than 606 mm, up to 1300 mm or less, approximately double this, reducing material costs and improving workability.

[0040] Furthermore, as shown in FIG. 2A , the roof structure 2 uses a sandwich panel with a core material 22 sandwiched between two metal skins 21. This allows for a wider spacing (pitch) between adjacent support members 5 in the eaves-ridge direction without reducing the strength of the roof, compared to roof structures using conventional sheathing. For example, in a conventional roof structure using 20-25 mm thick wood-wool cement boards and 20-30 mm thick rigid urethane foam boards, the spacing between support members 5 can be 606 mm. However, in the roof structure 1 according to this embodiment, the spacing between support members 5 can be 900-1300 mm, which is 1.4 to 2 times wider than conventional structures. Therefore, the roof structure 1 according to this embodiment can use fewer support members 5 than conventional structures, thereby reducing costs. Furthermore, because the roof structure 1 according to this embodiment uses sandwich panels, which have excellent strength and thermal insulation performance, it is not necessary to install the wood-wool cement boards and rigid urethane foam boards separately, as in conventional structures, improving workability.

[0041] In the roof structure 1 according to this embodiment, the peel strength of the roofing material 3 was measured using a 180° peel adhesion test (a test equivalent to the "180° peel method" of JIS Z 0237), and the result was an adhesion strength of 22 to 24 N / 25 mm in an atmosphere of 40°C. A similar test was also performed on a conventional roof structure, and the peel strength between the roofing material and the rigid polyurethane foam was found to be an adhesion strength of 12.7 N / 25 mm. Therefore, in the roof structure 1 according to this embodiment, the roofing material 3 is less likely to peel off from the roof underlayment 2, and the roof structure 1 has excellent wind pressure resistance.

[0042] (Variation) The first embodiment is merely one of various embodiments of the present disclosure, and various modifications can be made to the first embodiment depending on the design and the like, as long as the object of the present disclosure can be achieved.

[0043] In the first embodiment, the case where the roofing material 3 is horizontally laid is described, but this is not limited to this, and the present disclosure can also be applied to cases where the roofing material 3 is vertically laid, diagonally laid, diamond-shaped laid, etc.

[0044] In the first embodiment, the adhesive layer 42 is provided on both the upper and lower surfaces of the substrate 41, but this is not limiting, and the adhesive layer 42 may be provided only on the lower surface of the substrate 41, as shown in FIG. 4B. In this case, the adhesive layer 42 provided on the lower surface of the substrate 41 is adhered to the base treatment material 7. If the adhesive strength of the adhesive layer 32 is strong, the adhesive layer 42 on the upper surface of the substrate 41 is not necessary, and the adhesive layer 32 can be directly adhered to the upper surface of the substrate 41.

[0045] The base treatment material 7 of embodiment 1 does not have to be formed. If the base treatment material 7 is not formed, the adhesive layer 42 provided on the underside of the base material 41 is directly adhered (bonded) to the upper surface of the metal skin 21 above the roof underlayment 2. If the base treatment material 7 is not formed, the adhesive portion 4 contacts the upper surface of the roof underlayment 2 and forms a waterproof layer.

[0046] In the first embodiment, the case where the surface of the metal skin 21 is flat has been described, but this is not limiting, and the surface of the metal skin 21 may also be uneven. In this case, the metal skin 21 may be formed of, for example, a metal plate having an embossed, corrugated, ribbed, or the like. If the upper surface of the metal skin 21 that forms the upper surface of the roof underlayment 2 is uneven, the adhesion area with the adhesive material 4 becomes larger, and the fixing strength of the roof material 3 is likely to be improved.

[0047] In the first embodiment, the multiple roof underlayment boards 2 may be arranged either vertically or horizontally. That is, the multiple roof underlayment boards 2 may be arranged in either a direction perpendicular to or parallel to the longitudinal direction of the support member 5.

[0048] (summary) As described above, the first aspect is a roof structure (1) comprising a roof underlayment (2), a roofing material (3), and an adhesive portion (4). The roof underlayment (2) comprises a sandwich panel in which a core material (22) is disposed between two metal skins (21). The roofing material (3) has a metal roofing material body (31) and an adhesive layer (32) provided on the underside of the roofing material body (31), and is disposed above the roof underlayment (2). The adhesive layer (32) is a coating containing rubber or resin. The adhesive portion (4) is disposed between the roof underlayment (2) and the roofing material (3). The adhesive layer (32) is adhered to the adhesive portion (4), and the adhesive portion (4) is adhered to the roof underlayment (2), thereby fixing the roofing material (3) to the roof underlayment (2).

[0049] According to the first aspect, the roofing material (3) is fixed to the roofing material (2) by the adhesive portion (4) arranged between the roof underlayment (2) and the roofing material (3), so the adhesive portion (4) is less likely to be exposed to wind and rain and is less likely to deteriorate. This has the advantage that the fixing strength of the roofing material (3) by the adhesive portion (4) is less likely to decrease.

[0050] The second embodiment is the roof structure (1) of the first embodiment. The adhesive layer (32) is provided on a part of the lower surface of the roof material body (31).

[0051] According to the second aspect, the adhesive layer (32) can be provided only in the portion that adheres to the adhesive portion (4) of the roofing material main body (31), and there is no need to provide the adhesive layer (32) on the entire surface of the roofing material main body (31), which has the advantage of reducing wasteful use of the adhesive layer (32).

[0052] The third aspect is the roof structure (1) of the first or second aspect. The thickness of the adhesive layer (32) is 0.02 to 5 mm.

[0053] According to the third aspect, there is an advantage that the roofing material (3) is less likely to peel off from the adhesive portion (4) and has excellent wind pressure resistance.

[0054] The fourth aspect is the roof structure (1) of any one of the first to third aspects. The rubber or resin contained in the adhesive layer (32) is at least one selected from the group consisting of unvulcanized rubber, acrylic resin, urethane resin, silicone resin, and styrene-butadiene resin.

[0055] According to the fourth aspect, there is an advantage that the roofing material (3) is less likely to peel off from the adhesive portion (4) and has excellent wind pressure resistance.

[0056] The fifth aspect is the roof structure (1) of any one of the first to fourth aspects. No nails, screws or retaining clips are used to fix the roof material (3) to the roof underlayment material (2).

[0057] According to the fifth aspect, there is an advantage that holes for fixing to the roof material (3) are less likely to be formed, improving waterproofing. [Explanation of symbols]

[0058] 1. Roof structure 2 Roof base plate 3. Roofing materials 31 Roofing material body 32 Adhesive layer 4 Adhesive part

Claims

1. The roofing system includes a roof underlayment, a roofing material, and an adhesive portion. The roof underlayment includes a sandwich panel having a core material disposed between two metal skins; The roofing material has a metal roofing material body and an adhesive layer provided on the underside of the roofing material body, and is disposed above the roof underlayment, the adhesive layer is a coating film of a paint containing rubber or resin and containing asphalt, a urethane polymer, and calcium chloride; The adhesive portion is disposed between the roof underlayment and the roof material, The adhesive layer is adhered to the adhesive portion, and the adhesive portion is adhered to the roof underlayment, thereby fixing the roof material to the roof underlayment. Roof structure.

2. The adhesive layer is provided on a portion of the lower surface of the roofing material body. The roof structure of claim 1 .

3. The thickness of the adhesive layer is 0.02 to 5 mm.

3. A roof structure according to claim 1 or 2.

4. The rubber or resin contained in the adhesive layer is at least one selected from the group consisting of non-vulcanized rubber, acrylic resin, urethane resin, silicone resin, and styrene-butadiene resin. A roof structure according to any one of claims 1 to 3.

5. No nails, screws or retaining clips are used to secure the roofing material to the roof underlayment. A roof structure according to any one of claims 1 to 4.

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