JP7576278B2 - Roof structure - Google Patents

Description

This disclosure relates generally to roof structures, and more particularly to roof structures comprising a roof underlayment and a roofing material.

Patent Document 1 describes a flat roofing material. A number of these flat roofing materials are arranged side by side 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 material to the sheathing boards.

Japanese Patent Application Publication No. 10-231586

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 deteriorated the areas around the nail holes in the flat roofing material, which reduced the mounting strength of the flat roofing material.

The purpose of this disclosure is to provide a roof structure that is less likely to reduce the mounting strength of roofing materials.

A roof structure according to one aspect of the present disclosure includes a roof underlayment, a base treatment material, a metal roofing material, and an adhesive part, the roof underlayment includes a sandwich panel having a core material disposed between two metal skins, the base treatment material is provided on the upper surface of one of the metal skins of the roof underlayment, the adhesive part is formed with an adhesive layer on both the upper and lower surfaces of the base material and is disposed between the base treatment material and the roofing material, the adhesive layer on the lower side of the adhesive part is adhered to the upper surface of the base treatment material, and the adhesive layer on the upper side of the adhesive part is adhered to the lower surface of the roofing material, thereby fixing the roofing material to the roof underlayment.

According to the present disclosure, the roofing material is fixed to the roofing underlayment by an 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. This has the advantage that the mounting strength of the roofing material by the adhesive portion is less likely to decrease.

1A and 1B are a perspective view and a cross-sectional view, respectively, of one embodiment of a roof structure according to the present disclosure; Fig. 2A is a perspective view showing a roof underlayment board of the roof structure according to the present disclosure, and Figs. 2B and 2C are cross-sectional views showing the same in an installed state. Fig. 3A is a perspective view showing a roof material of the first embodiment 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. FIG. 4 is a cross-sectional view showing an adhesive portion of the roof structure according to the first embodiment of the present disclosure. FIG. 5 is a perspective view showing a roof material of a second embodiment of a roof structure according to the present disclosure. FIG. 6 is a cross-sectional view showing an adhesive portion of a second embodiment of a roof structure according to the present disclosure. 7A is a plan view showing a roof material of a roof structure according to a third embodiment of the present disclosure, and FIGs. 7B and 7C are cross-sectional views showing the same roof material. 8A and 8B are perspective and cross-sectional views of a third embodiment of a roof structure according to the present disclosure.

(Embodiment)
The roof structure 1 according to this embodiment includes a roof underlayment 2, a roof material 3, and an adhesive portion 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.

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 the same as the slope direction of the roof, and the direction indicated by the arrow X1 in Figure 1A is the ridge direction, and the direction opposite to the 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 the arrow Y1 in Figure 1A is the rightward direction, and the direction opposite to the arrow Y1 is the leftward direction. The direction indicated by the arrow Z1 in Figure 1A is the upward direction, which is perpendicular to the roof surface. The direction opposite to the arrow Z1 is the downward direction.

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 skin 21 is a metal plate formed into a desired shape by rolling or pressing. The metal plate has a thickness of, for example, about 0.25 to 1.6 mm. The metal plate may be, but is not limited to, 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, etc.

The core material 22 is a resin foam or a fibrous inorganic material, or a combination thereof, and has heat insulating properties and fire resistance. The resin foam is, for example, a polyisocyanurate foam, a urethane foam, or a phenol foam having a density of 40 to 60 kg/m ^3. The fibrous inorganic material is, for example, a block body made of rock wool or glass wool solidified with a binder or the like, arranged in a single plate shape. The core material 22 is attached to the metal skin 21, for example, by adhesion. The core material 22 may be a combination of a layer made of a fibrous inorganic material and a layer made of a resin foam, which are laminated in the thickness direction of the sandwich panel (the direction in which the two metal skins 21 face each other). In addition, among the core materials 22, a fire-resistant core material having a higher fire resistance than the fibrous inorganic material or the resin foam may be used as the core material located at the peripheral end of the sandwich panel. In this case, the fire-resistant core material is, for example, an inorganic material such as a gypsum board or a calcium silicate board. The core material 22 is preferably made of rock wool, which has excellent heat insulating properties, and in this case, the thickness is preferably 35 to 50 mm.

The roof underlayment board 2 is a substantially rectangular plate in plan view (seen from above). In this embodiment, the roof underlayment board 2 is arranged vertically so that the eaves-ridge direction is the longitudinal direction (length direction) of the roof underlayment board 2 and the girder direction is the transverse direction (width direction). The roof underlayment board 2 may be arranged horizontally. The roof underlayment board 2 has a mating protrusion 23 at the right end and a mating recess 24 at the left end. The mating protrusion 23 and the mating recess 24 are provided along the longitudinal direction at the end of the girder direction of the roof underlayment board 2. A packing is provided 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.

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

Two roof underlayment boards 2 adjacent in the girder direction are connected by fitting the mating convex portion 23 and the mating concave portion 24 together, as shown in FIG. 2B. Two roof underlayment boards 2 adjacent in the eaves-ridge direction are installed by butting their ends together via a packing material such as rock wool felt, as shown in FIG. 2C. Two roof underlayment boards 2 adjacent in the eaves-ridge direction may 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 constructed in a state of spanning multiple support members 5 adjacent in the eaves-ridge direction.

It is preferable to provide a base treatment material 7 above the roof underlayment 2. The base treatment material 7 can be formed, for example, as a coating film of 0.5 to 2 mm on 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 the purposes of 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 of 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), etc. One or more types of primer materials can be used.

The adhesive portion 4 is disposed above the roof underlayment 2. If 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. If the base treatment material 7 is not formed, the adhesive portion 4 is provided as a waterproof layer in contact with the upper surface of the roof underlayment 2. The adhesive portion 4 can be an adhesive material having an adhesive layer 42. For example, a sheet-shaped butyl rubber-based adhesive can be used. For example, as shown in FIG. 4, the adhesive portion 4 can be an adhesive material having an adhesive layer 42 provided on the lower surface of a substrate 41. The adhesive portion 4 can be 0.5 to 2.0 mm thick, preferably 0.8 to 1.5 mm thick.

The substrate 41 is preferably flexible, and may be, for example, a rubber sheet or a polyvinyl chloride sheet. Of the rubber sheets, it is preferable to use a butyl rubber sheet, which has excellent weather resistance and adhesiveness. The substrate 41 may be, for example, a non-vulcanized butyl rubber sheet with a polyolefin reinforcing layer.

The adhesive layer 42 is a layer that adheres to the upper surface of the base treatment material 7 or the roof underlayment 2. Here, adhesion is a type of bonding, and refers to bonding that is performed at room temperature for a short period of time by applying only slight pressure without using water, solvents, heat, etc. In this embodiment, the adhesive layer 42 adheres to the upper surface of the base treatment material 7 or the roof underlayment 2 mainly due to the weight of the roof material 3. In addition, the adhesive layer 42 adheres to the upper surface of the base treatment material 7 or the roof underlayment 2 by pressing the roof material 3. As the adhesive material, one or more types of butyl rubber adhesives, acrylic resin adhesives, silicone resin adhesives, rubber adhesives, urethane adhesives, etc. can be used. The adhesive layer 42 can be formed by integrating the adhesive material with the lower surface of the substrate 41 by methods such as adhesion, self-adhesion, pasting, and coating.

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, etc. for fixing the roofing material 3 are not used, or can be used very little. Therefore, no holes are formed in the roofing material 3 and the adhesive portion 4, improving the waterproofing of the roof. The adhesive portion 4 is also used to improve the waterproofing of the roof. Therefore, there is no need to use roofing materials such as asphalt roofing, and the reduction in the number of parts allows for lower costs.

The roofing material 3 comprises a roofing material body 31 and a backing material 32. The roofing material body 31 is a member that constitutes the upper surface of the roofing material 3, and is made of, for example, 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, 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, etc., but is not limited thereto. In this embodiment, the roofing material body 31 has a hook portion 34 at the eaves side end. The roofing material body 31 also has a hook receiving portion 33 at the ridge side end. The hook portion 34 and the hook receiving portion 33 are formed over almost the entire length of the roofing material body 31 in the girder direction. The eaves side end of the roofing material body 31 is the end that faces the eaves side when the roofing 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.

The backing material 32 is provided over almost the entire underside of the roofing material body 31. The backing material 32 is provided on the upper surface of the hook receiving portion 33. The backing material 32 is flexible and adhesive, and can be formed of, for example, non-vulcanized rubber. Non-vulcanized rubber is preferable because it has higher flexibility and adhesiveness than vulcanized rubber. As the non-vulcanized rubber, it is preferable to use non-vulcanized butyl rubber from the viewpoint of durability. The backing material 32 can be provided over the entire underside of the roofing material body 31, but this is not limited thereto, and the backing material 32 may be provided on a part of the underside of the roofing material body 31 to be bonded to the adhesive portion 4 and integrated. For example, in FIG. 1B, the adhesive portion 4 may be disposed only on the portion in contact with the underside of the roofing material 3. In this case, the adhesive portion 4 is not disposed on the portion not in contact with the underside of the roofing material 3, and the amount of adhesive portion 4 used is reduced, resulting in cost reduction.

As shown in Figures 3B and 3C, the roofing material 3 may further have a hook portion 35 and a hook receiving portion 36 on both ends that are 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. As shown in Figure 3D, the roofing material 3 may be a roofing material for line roofing. 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 backing material 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 backing material 32.

The roof structure 1 according to this embodiment can be formed as follows. First, multiple roof underlayment panels 2 are placed above the support members 5. In this case, each roof underlayment panel 2 is placed on multiple support members 5 and spanned. Each roof underlayment panel 2 is fixed to the support members 5 with fasteners 6 such as nails or screws. Adjacent roof underlayment panels 2 in the girder direction are connected by fitting the fitting recesses 24 and the fitting protrusions 23 together (see FIG. 2B). Adjacent roof underlayment panels 2 in the eaves-ridge direction are connected by butting their ends together. It is necessary to provide fireproof material 51 on the outer surface of each support member 5 to improve fire resistance. For fireproof buildings under the Building Standards Act, a fireproof certified product (e.g., sprayed rock wool) is used as the fireproof material 51. It is also preferable to seal the gaps in the connection parts of adjacent roof underlayment panels 2 with tape material 25 such as aluminum tape to ensure temporary waterproofing during temporary fastening and fireproof performance.

Next, as shown in FIG. 1A, a base treatment material 7 is formed on the upper surface of the roof underlayment 2. The base treatment material 7 can be formed over the entire upper surface of the roof underlayment 2 fixed to the support member 5, but is not limited to this, and the base treatment material 7 may be formed on only a part of the roof underlayment 2.

Next, the adhesive portion 4 is formed above the roof underlayment 2. In this case, if the adhesive portion 4 is formed with an adhesive material, the adhesive material is laid on the upper surface of the base treatment material 7 to form the adhesive portion 4. The adhesive portion 4 is formed so that the adhesive layer 42 is in contact with the upper surface of the base treatment material 7. Therefore, the base material 41 of the adhesive portion 4 faces upward. The adhesive layer 42 is also adhered (bonded) to the upper surface of the base treatment material 7. Note that if the base treatment material 7 is not formed, the adhesive layer 42 is adhered (bonded) to the upper surface of the roof underlayment 2.

Next, as shown in FIG. 1A, multiple roofing materials 3 are placed above the adhesive portion 4. The multiple roofing materials 3 are placed horizontally. 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. When roofing materials 3 are adjacent in the girder direction, the horizontal ends of the roofing materials 3 are overlapped and connected vertically.

As shown in FIG. 1A, the roofing material 3 is fixed to the roof underlayment 2 by the adhesive portion 4. That is, the backing material 32 on the back side of the roofing material 3 is adhered to the substrate 41 on the upper surface of the adhesive portion 4. As a result, the roofing material 3 is 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. For example, a sheet-shaped butyl rubber-based adhesive is used to adhere the backing material 32 to the substrate 41. For example, a butyl rubber-based adhesive is used to adhere the backing material 32 to the substrate 41.

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 disposed between the roof underlayment 2 and the roof material 3. This makes the adhesive portion 4 less likely to be exposed to wind and rain, and the adhesive portion 4 is less likely to deteriorate, so that the mounting strength of the roof material 3 by the adhesive portion 4 is less likely to decrease.

In the roof structure 1 according to this embodiment, nails, screws, etc., are not used or are used very little to secure the roofing material 3. This prevents corrosion and loss of strength at the nailed fastening parts of the roofing material as in the past, and makes it extremely unlikely that the roofing material 3 will fly off even in the case of a typhoon (strong winds) that exceed the current design strength.

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

As shown in FIG. 1A, the roof structure 1 according to this embodiment includes the roof underlayment 2, the adhesive portion 4, and the roof material 3, and therefore has excellent fire resistance (non-damage, flame-resistant) in terms of fire resistance under the Building Standards Act. For example, the roof structure 1 according to this embodiment can obtain a 30-minute fire-resistant roof certification. Meanwhile, while the fire-resistant specifications of conventional construction methods such as wood wool cement boards, resin foam insulation materials, and roof materials require a purlin spacing of 606 mm or less, the roof structure 1 according to this embodiment can specify a purlin spacing of up to 1300 mm or less, which is approximately double the 606 mm, reducing material costs and improving workability.

As shown in FIG. 2A, a sandwich panel with a core material 22 between two metal skins 21 is used as the roof underlayment 2, so that the strength of the roof can be prevented from decreasing even if the interval (pitch) between adjacent support members 5 in the eaves-ridge direction is made wider than in a roof structure using a conventional sheathing board. For example, in a conventional roof structure equipped with a 20-25 mm thick wood wool cement board and a 20-30 mm thick rigid urethane foam board, the interval between the support members 5 can be 606 mm, but in the roof structure 1 according to this embodiment, the interval between the support members 5 can be 1300 mm, which is more than twice as long as in the conventional structure. Therefore, in the roof structure 1 according to this embodiment, the number of support members 5 used can be reduced compared to the conventional structure, and costs can be reduced. In addition, since the roof structure 1 according to this embodiment uses a sandwich panel with excellent strength and heat insulation performance, there is no need to install the wood wool cement board and the rigid urethane foam board separately as in the conventional structure, and workability is improved.

In the roof structure 1 according to this embodiment, the peel strength of the roofing material 3 was measured by a 180° peel adhesion test (a test equivalent to the "180° peel method" of JIS Z 0237), and an adhesion strength of 22 to 24 N/25 mm was obtained 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 urethane foam was 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 it has excellent wind pressure resistance.

(Modification)
The first embodiment is merely one of various embodiments of the present disclosure. The first embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.

In the first embodiment, the case where the roofing material 3 is laid horizontally is described, but this is not limited thereto, and the present disclosure is also applicable to cases where the roofing material 3 is laid vertically or diagonally (diamond-shaped).

The adhesive layer 42 in embodiment 1 may be formed using a double-sided adhesive material. The adhesive layer 42 may be a sheet material or a tape.

(Embodiment 2)
The roof structure 1 according to this embodiment differs from the roof structure 1 according to the first embodiment in the configurations of the roof material 3 and the adhesive portion 4. Hereinafter, the same configurations as those in the first embodiment will be denoted by the same reference numerals and will not be described as appropriate. The configuration described in the second embodiment can be applied in appropriate combination with the configuration described in the first embodiment (including the modified example).

In this embodiment, the roofing material 3 corresponds to the roofing material body 31 of the roofing material 3 of embodiment 1 shown in FIG. 3A, excluding the backing material 32. That is, as shown in FIG. 5, the roofing material 3 is made of metal, for example, and is formed into the desired shape by rolling or pressing a metal plate. The roofing material 3 has a hook portion 34 at the eaves side end. The roofing material 3 also has a hook receiving portion 33 formed at the ridge side end. The hook portion 34 and the hook receiving portion 33 are formed over almost the entire length of the roofing material body 31 in the girder direction.

In this embodiment, the adhesive portion 4 is the adhesive portion 4 of embodiment 1 shown in FIG. 4, further comprising an adhesive layer 42. That is, as shown in FIG. 6, the adhesive portion 4 has adhesive layers 42 provided on both the upper and lower surfaces of the substrate 41. In other words, the substrate 41 is sandwiched between a pair of upper and lower adhesive layers 42 to form the adhesive portion 4.

In this embodiment, as in the above, when forming the adhesive portion 4 above the roof underlayment 2, an adhesive material is laid on the upper surface of the base treatment material 7 to form the adhesive portion 4, but in this case, the adhesive layer 42 provided on the lower surface of the base material 41 is formed so as to contact the upper surface of the base treatment material 7. Therefore, the adhesive layer 42 on the lower side of the adhesive portion 4 is adhered (adhered) to the upper surface of the base treatment material 7.

Next, multiple roofing materials 3 are placed above the adhesive portion 4. In this embodiment, the roofing materials 3 are placed so that the lower surface of the roofing materials 3 contacts the upper surface of the adhesive layer 42 provided on the upper surface of the base material 41. Therefore, the adhesive layer 42 on the upper side of the adhesive portion 4 is adhered (adhered) to the lower surface of the roofing material 3. Then, the roofing material 3 is fixed to the roof underlayment 2 by the adhesive portion 4. That is, the roofing material 3 is adhered to the adhesive layer 42 on the upper surface of the base material 41, and the adhesive layer 42 on the lower surface of the base material 41 is adhered to the base treatment material 7. As a result, the roofing material 3 is 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. Note that in the second embodiment, the roofing material 3 may be any of horizontal, vertical, and diamond roofing.

(Embodiment 3)
The roof structure 1 according to this embodiment differs from the roof structure 1 according to the first and second embodiments in the configuration of the roof material 3. Hereinafter, the same configurations as those in the first and second embodiments will be denoted by common reference numerals and will not be described as appropriate. The configuration described in the second embodiment can be applied in appropriate combination with the configurations (including modified examples) described in the first and second embodiments.

In this embodiment, the roofing material 3 is covered with diamond roofing. As shown in FIG. 7A, the roofing material 3 has a roofing material body 31 formed in a diamond shape in a plan view. As shown in FIG. 7B, a hook portion 34 is provided over the entire length of one of the two eaves side ends of the roofing material body 31. Also, a hook receiving portion 33 is provided over the entire length of one of the two ridge side ends of the roofing material body 31. As shown in FIG. 7C, a hook portion 34 is provided over the entire length of the other of the two eaves side ends of the roofing material body 31. Also, a hook receiving portion 33 is provided over the entire length of the other of the two ridge side ends of the roofing material body 31. In this way, the hook receiving portion 33 and the hook portion 34 are arranged on both the left and right sides of the roofing material 3. Also, a backing material 32 is provided on the lower surface of the roofing material body 31 and the upper surface of the hook receiving portion 33.

As shown in FIG. 8A, multiple roofing materials 3 are laid in a line in the eaves-ridge direction and the girder-row direction. At this time, as shown in FIG. 8B, adjacent roofing materials 3 are connected by hooking the hooking portion 34 and the hook receiving portion 33. Also, each roofing material 3 is adhered to the roof underlayment 2 or the underlayment material 7 via the adhesive portion 4, as in the above embodiment.

(summary)
As described above, the first aspect is a roof structure (1) including a roof underlayment (2), a base treatment material (7), a metal roofing material (3), and an adhesive part (4). The roof underlayment (2) includes a sandwich panel in which a core material (22) is disposed between two metal skins (21). The base treatment material (7) is provided on the upper surface of one of the metal skins (21) of the roof underlayment (2). The adhesive part (4) is formed with an adhesive layer (42) on both the upper and lower surfaces of the base material (41), and is disposed between the base treatment material (7) and the roofing material (3). The adhesive layer (42) on the lower side of the adhesive part (4) is adhered to the upper surface of the base treatment material (7), and the adhesive layer (42) on the upper side of the adhesive part (4) is adhered to the lower surface of the roofing material (3), thereby fixing the roofing material (3) to the roof underlayment (2).

According to the first aspect, the roofing material (3) is fixed to the roof underlayment (2) by the adhesive portion (4) disposed between the base treatment material (7) and the roofing material (3), so that the adhesive portion (4) is less likely to be exposed to wind and rain, and the adhesive portion (4) is less likely to deteriorate. This has the advantage that the mounting strength of the roofing material (3) by the adhesive portion (4) is less likely to decrease.

In the second aspect, in the roof structure (1) of the first aspect, each of the adhesive layers (42) is adhered to the base treatment material (2) or the roof material (3) by the weight of the roof material 3.

The second aspect has the advantage that the roofing material (3) can be fixed to the roof underlayment (2) by the adhesive portion (4) arranged between the underlayment material (7) and the roofing material (3).

In the third aspect, in the roof structure (1) of the first or second aspect, the peel strength of the roof material (3) is 22 to 24 N/25 mm in an atmosphere at 40°C when measured by a 180° peel adhesion test.

The third aspect has the advantage that the roof material (3) is less likely to peel off from the roof underlayment (2) and has excellent wind pressure resistance.

In the fourth aspect, in the roof structure (1) of any one of the first to third aspects, no nails or screws are used to fasten the roof material (3) to the roof underlayment (2).

The fourth aspect has the advantage that corrosion and loss of strength at the nailed fixing parts of the roofing material (3) as in the past can be prevented, and the possibility of the roofing material (3) being blown away is extremely low even in the case of a typhoon (strong winds) that exceed the current design strength.

In the fifth aspect, in the roof structure (1) of any one of the first to fourth aspects, the roof underlayment (2) is arranged across multiple support members (5).

The fifth aspect has the advantage that the distance between adjacent support members (5) can be made wider than in the past, which reduces costs.

The sixth aspect is the roof structure (1) of the fifth aspect, in which the spacing between the multiple support members (5) is 1,300 mm or less.

According to the sixth aspect, the interval between adjacent support members (5) can be made wider than before, which has the advantage of reducing costs and improving the efficiency of construction work. Therefore, the interval between the support members (5) can not only be made larger than the conventional 606 mm, but also the standard of 1300 mm can be achieved for strength, and 1300 mm or less can be achieved for fire-resistant construction certification.

The seventh aspect is a roof structure (1) according to the fifth or sixth aspect, in which a fireproof material (51) is provided on the outer surfaces of the multiple support members (5).

The seventh aspect has the advantage of improving fire resistance.

In the eighth aspect, in the roof structure (1) of any one of the first to seventh aspects, the base treatment material (7) is formed of a primer material containing at least one selected from the group consisting of butyl rubber-based base treatment materials, acrylic resin-based base treatment materials, urethane resin-based base treatment materials, and silicone resin-based base treatment materials.

The eighth aspect has the advantage that the roofing material (3) can be fixed to the roof underlayment (2) by the adhesive portion (4) arranged between the underlayment material (7) and the roofing material (3).

In the ninth aspect, in the roof structure (1) of any one of the first to eighth aspects, the base treatment material (7) is formed of a coating film having a thickness of 0.5 to 2 mm.

The ninth aspect has the advantage that the roofing material (3) can be fixed to the roof underlayment (2) by the adhesive portion (4) arranged between the underlayment material (7) and the roofing material (3).

Reference Signs List 1 Roof structure 2 Roof underlayment 3 Roof material 4 Adhesive part 41 Substrate 42 Adhesive layer 5 Support member 51 Fireproof material 7 Undercoat treatment material

Claims (9)

The roofing system includes a roof underlayment board, a base treatment material, a metal roofing material, and an adhesive part.
The roof underlayment includes a sandwich panel having a core material disposed between two metal skins;
The base treatment material is provided on an upper surface of the metal exterior of one of the roof underlayments,
The adhesive portion is formed by having an adhesive layer on both the upper surface and the lower surface of the base material, and is disposed between the base treatment material and the roofing material,
The adhesive layer on the lower side of the adhesive portion is adhered to the upper surface of the base treatment material, and the adhesive layer on the upper side of the adhesive portion is adhered to the lower surface of the roof material, thereby fixing the roof material to the roof base board.
Roof structure. Each of the adhesive layers is adhered to the base treatment material or the roofing material by the weight of the roofing material.
The roof structure of claim 1. The peel strength of the roofing material is 22 to 24 N/25 mm in an atmosphere of 40° C. when measured by a 180° peel adhesion test.
A roof structure according to claim 1 or 2. No nails or screws are used to fasten the roofing material to the roof underlayment.
A roof structure according to any one of claims 1 to 3. The roof underlayment is disposed across a plurality of support members.
A roof structure according to any one of claims 1 to 4. The interval between the plurality of support members is 1300 mm or less.
The roof structure of claim 5. The outer surfaces of the plurality of support members are provided with a fireproof material.
A roof structure according to claim 5 or 6. The base treatment material is formed of a primer material including at least one selected from the group consisting of a butyl rubber-based base treatment material, an acrylic resin-based base treatment material, a urethane resin-based base treatment material, and a silicone resin-based base treatment material.
A roof structure according to any one of claims 1 to 7. The base treatment material is formed of a coating film having a thickness of 0.5 to 2 mm.
A roof structure according to any one of claims 1 to 8.

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