JP2000145042A - Frp-made roof material and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an earthquakeproofing property by arranging a pair of plates at least one of which is made of FRP with a clearance and interposing a rib structural body to connect the both plates in this clearance. SOLUTION: An FRP made roof material 1 provided with a pair of plates 3a, 3b arranged in parallel with a clearance 2 and a rib structural body 4 to connect the both plates 3a, 3b in the clearance 2 is formed. Additionally, dimensions of the clearance 2 formed between a pair of the plates 3a, 3b are formed constant in the plate extending direction and the other plate is shaped to extend in a straight line by changing the one plate 3 in a curved line on 'this FRP made roof material 1. Furthermore, the clearance 2 is arranged to be kept constant by forming the one plate 3 in a saw blade folded plate shape by arranging a crest part and a valley part alternately and forming both of a pair of the plates 3 in a folded plate shape or in a zigzag shape. Consequently, it is possible to extensively improve a designing property by forming it in a free shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roofing material made of FRP and a method for manufacturing the same, and more particularly to a roofing material made of FRP which can be easily formed into an arbitrary shape with a light weight and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a roof material for constructing a roof itself or an eaves portion, a metal material such as a folded plate is generally adhered to a frame made of a steel frame. Therefore, there is a problem of deterioration due to generation of rust. In addition, since the main member is made of metal, the weight is large, which is disadvantageous for the earthquake resistance of the building. When lighter,
It is difficult to ensure sufficient strength and rigidity.

Further, it is difficult to form a curved surface or a three-dimensional shape in a structure in which a metal material made of a flat plate or a folded plate is attached. Design constraints are increased, and there is a limit in improving the design by forming the roofing material into a desired shape.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the possibility of rusting, to improve the building's seismic resistance, to be lightweight, and to ensure high strength and rigidity while maintaining a high design quality. An object of the present invention is to provide an FRP roofing material that can be formed into a shape and a method for manufacturing the same.

[0005]

In order to solve the above-mentioned problems, at least one of the FRP roofing materials of the present invention is made of FR.
A pair of plates made of P are arranged with a gap, and a rib structure for joining the two plates is interposed in the gap.

As the material of the rib structure, FRP, metal, wood, or the like can be used, and it is preferable that the rib structure is arranged and incorporated at the same time as forming a pair of plates.

[0007] The dimension of the gap between the pair of plates may be substantially constant or may vary in the direction in which the plates extend.

The shape of the plate itself may be a simple flat plate. For example, at least one of the plates may be formed in a folded plate shape in which peaks and valleys are alternately arranged. You can also. The peaks and / or valleys may be linearly extended in a certain direction or may be three-dimensionally formed in a pyramid shape.

The gap between the pair of plates can be formed in a space as it is, but a sandwich structure in which a filler having a specific gravity smaller than any of the pair of plates is disposed in the gap can also be used.

[0010] Further, a structure may be employed in which a connecting member to be connected to another member is attached to an outer surface of at least one plate. It is preferable that the connecting member is attached to a position corresponding to the installation position of the rib structure. As the connecting member, a member having a universal joint is preferable in order to prevent the connecting member or the FRP roofing material from being twisted and to enable connecting with other members located in various directions.

The rib structure can have various cross-sectional shapes as shown in embodiments described later, but can also be formed into a truss or a ramen structure.

Further, the FRP roofing material according to the present invention includes:
An opening penetrating in the thickness direction may be provided. If the window component is attached to the opening, a window capable of lighting can be installed at a predetermined location, and if the opening of the predetermined shape is left,
Ventilation holes or the like in an open-structure roof or the like can be formed.

In the FRP roofing material according to the present invention, it is preferable that the matrix resin of at least one of the plates is made of a phenol resin in order to improve fire resistance. Further, a layer made of a refractory material, for example, a refractory material or a refractory paint may be provided on at least one side.

Further, it is possible to form the entire FRP roofing material or the entire FRP roofing material constituting the roof into a three-dimensional shape. For example, a structure in which at least one plate has a polyhedral three-dimensional shape portion or a structure in which at least one plate has a three-dimensional shape portion having a three-dimensional curved surface portion can be employed. Further, a structure having both of these three-dimensionally shaped portions may be adopted.

The above-mentioned FRP roofing material can be manufactured by various methods. In particular, in the case of a large-sized FRP roofing material, the following method is suitable. That is, the method of manufacturing a roofing material made of FRP according to the present invention comprises, when forming a plate made of at least one FRP of the roofing material made of FRP described above, disposing a reinforcing fiber base material in a mold, After covering with, make the inside covered with the bag base material a vacuum,
The method comprises a step of injecting a resin, diffusing the resin into the surface of the reinforcing fiber base, and impregnating the reinforcing fiber base to form the resin.

In such a roofing material made of FRP according to the present invention, since the main member is made of FRP, it is lighter in weight and less likely to generate rust as compared with the case where the main member is made of metal. Since the weight of the entire roof can be reduced, the earthquake resistance of the building is improved.

Further, since a rib structure for joining the two plates is provided between a pair of plates at least one of which is made of FRP, high strength and rigidity are secured as a whole FRP roofing material. In addition, since the gap between the plates has a space or a structure filled with a low specific gravity material such as a foam material, the heat insulating property is excellent.

Further, since at least one of the plates made of FRP can be freely formed into an arbitrary shape by changing its molding die, design restrictions on the roof shape are greatly relaxed, and the designer can achieve the target. It is possible to adopt a free shape having high designability.

Further, by using a phenol resin as the matrix resin of the FRP, excellent fire resistance can be imparted, and by providing a refractory material on at least one side, further excellent fire resistance can be imparted. Therefore, an FRP roofing material that can be applied not only to eaves materials with loose legal regulations but also to roof bodies with tight legal regulations can be configured.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a partial longitudinal section of an FRP roofing material according to an embodiment of the present invention. In FIG. 1, a roofing material 1 made of FRP includes a pair of plates 3 a and 3 b
And a rib structure 4 that joins the two plates 3a and 3b. In this embodiment, both the plates 3a and 3b are made of FRP, and the rib structure 4 is also made of FRP.
It is composed of RP. However, the rib structure 4 can be made of another material such as metal or wood. When the rib structure 4 is made of any material, the plate 3
It is preferable to perform arrangement and incorporation simultaneously with the molding of a and 3b.

As the matrix resin of the FRP in the present invention, a thermosetting resin such as an epoxy resin, a phenol resin, an unsaturated polyester resin, a urethane resin, and a melamine resin is preferable.
It is excellent in flame retardancy and is preferably used.

As the reinforcing fibers of the FRP, inorganic fibers are preferably used. For example, glass fibers, tyrano fibers, carbon fibers, silicon carbide fibers, silicon nitride fibers, boron fibers, alumina fibers, mineral fibers, etc. Can be used. These fibers cost,
It can be used alone or in combination with consideration of performance. Further, examples of the form of the reinforcing fiber base include a woven fabric (plain weave, unidirectional weave), a nonwoven fabric, a knitted fabric, and a braided fabric. Among them, a woven fabric which is often used for FRP and has a large reinforcing effect is preferable.

The cross-sectional shape of the rib structure can take various shapes. FIG. 1 shows the rib structure 4 having a cross-sectional shape extending only in the vertical direction, but various shapes as shown in FIG. 2 can be adopted, for example. In the structure shown in FIG. 2A, the cross-sectional shape is an I-shaped or H-shaped rib structure 4a. In the structure shown in FIG. 2B, the cross-sectional shape is a C-shaped rib structure 4b. In the structure shown in (1), the C-shaped rib structure is a rib structure 4c arranged back to back.
In the structure shown in (D), the cross-sectional shape is a rib structure 4d having a key shape or a connecting member shape. In the structure shown in (E),
The cross-sectional shape is a hat-shaped rib structure 4e. Further, the rib structures having different cross-sectional shapes can be selected according to the portion of the FRP roofing material, and can be adopted in combination.

In the FRP roofing material according to the present invention,
As shown in FIGS. 1 and 2, the size of the gap 2 formed between the pair of plates 3a and 3b (the size in the vertical direction in the drawing)
Can be substantially constant in the plate extending direction. Further, a configuration may be adopted in which the size of the gap changes in the plate extending direction. For example, as shown in FIG. 3, when viewed in cross section, one plate 3 c changes in a curved shape, and the other plate 3 d has a shape that extends linearly.
c, The dimension of the gap 2a between 3d can be changed continuously.

As the roofing material, a folded plate-shaped member may be used in some cases in order to increase the strength and rigidity. However, the same can be adopted in the present invention. For example, FIG.
As shown in the cross-section, one plate 3e is formed in a sawtooth-shaped folded plate shape in which peaks and valleys are alternately arranged,
The other plate 3f can have a shape extending linearly.

In the structure shown in FIG. 3, the plate 3d may also be formed in a shape that changes in a curved manner on the lower side of the figure. In the structure shown in FIG. 4, the plate 3f on the lower side of the figure is also folded. It may be formed in a plate shape.

As shown in FIG. 5, a pair of plates 3g, 3g
h may be formed in a folded plate shape or a zigzag shape so that the gap 2 is kept substantially constant between the two plates.

Further, the irregular shape of the FRP plate as described above can be three-dimensionally enlarged. For example, as shown in FIG. 6, a plate 3i made of FRP is bulged or dented in a pyramid shape, and the bulge or dent portion 5 is provided alone or in a plurality. it can. The bulging portion or the dent portion 5 may be formed in a curved surface (three-dimensional curved surface).

As described above, by forming the surface (one or both surfaces) of the roofing material with a plate made of FRP, the roofing material can be formed into a substantially free shape, the design restrictions are greatly reduced, and the design is improved. Can be greatly improved. Moreover, a desired free shape can be realized at low cost.

Further, since the roofing material is mainly composed of the FRP board, the weight can be significantly reduced as compared with the conventional roofing material mainly composed of metal, and the earthquake resistance of the building can be improved accordingly. Moreover, since a structure in which a metal portion does not easily appear on the outer surface can be obtained, there is essentially no fear of rust.

Further, since it has a structure in which the two plates 3a and 3b are joined with the rib structure 4, the strength and rigidity of the roofing material itself are extremely high while maintaining lightness. Moreover, both plates 3a,
Since the gap 2 is provided between 3b, the heat insulating property is extremely high.

Further, when a phenol resin is used as the matrix resin of FRP, excellent fire resistance can be obtained.

In each of the above embodiments, the gap 2 between the two plates is formed in the space. In this gap 2, for example, a filler having a specific gravity smaller than any of the pair of plates can be arranged. By using such a filler having a small specific gravity, the strength and rigidity can be further improved and the heat insulating property can be improved without impairing the lightness of the entire roofing material. Further, the predetermined cross-sectional shape can be more reliably maintained.

As the filler, for example, wood or foam can be used, but foam is preferable in terms of weight reduction. As the material of the foam, polyurethane, polystyrene, polyethylene, polypropylene, PVC, silicon, or the like is used, and its specific gravity is preferably selected from 0.02 to 0.2. The material and specific gravity of the foam can be selected according to the required characteristics of the FRP roofing material, the type of resin used, and the like. If the specific gravity is less than 0.02, sufficient strength may not be obtained. Moreover, the specific gravity is 0.
If it exceeds 2, the strength will be high, but the weight will increase, which is contrary to the purpose of reducing the weight.

This filler functions as a core material 12 of an FRP roofing material 11 configured as a sandwich structure, as shown in FIG. 7, for example.

In the roofing material made of FRP according to the present invention,
A truss or a ramen structure can be arranged as a rib structure between a pair of plates. For example, FIG. 8 shows a structure in which a ramen structure 13 is disposed in a gap 2 between a pair of plates 3a and 3b. With the ramen structure 13, both plates 3
a and 3b are bonded very firmly, and the dimensional deviation between the plates is suppressed. Materials such as FRP, metal, and wood can be used for the ramen structure 13 and the truss structure.

When the FRP roofing material is actually constructed, it is preferable that a connecting member to be connected to another member (other building member) is attached to the outer surface of at least one plate of the FRP roofing material. . This connecting member is preferably attached to a position corresponding to the position where the rib structure is provided in order to maintain a predetermined cross-sectional shape of the FRP roofing material.

For example, as shown in FIG.
The connecting members 14a and 14b are attached to the outer surface of the plate 3a and the outer surface of the plate 3b corresponding to the arrangement position of a. The attachment may be performed by a method of bonding to the outer surface of the plate or a method of integrally molding with the plate. However, it is preferable to directly connect and join the rib structure 4a with the through bolt 15 or the like from the viewpoint of load transmission.

Further, as shown in FIG.
Preferably has a universal joint 16 that can rotate not only in one direction but also in multiple directions to prevent twisting. The use of the universal joint 16 facilitates installation and construction of the FRP roofing material, and prevents generation and transmission of undesired stress such as torsional stress. In addition, in the universal joint 16 shown in FIG. 10, since the rotation range is slightly narrow, the oblique base 14c is used as an auxiliary. However, it may not be necessary to use the oblique base 14c depending on the angle.

FIG. 11 shows the use of the universal joint 16 as described above, and the disposition of rib structures 4, 4a having a shape corresponding to the part of the FRP roofing material (a plurality of types of rib structures are mixed). An example of a preferred embodiment using a core material 12 made of a foam is shown. In the example shown in FIG.
a has two pins 16b extending in directions perpendicular to each other;
16c is used.

Further, in the FRP roofing material according to the present invention, an opening penetrating in the thickness direction can be provided in order to form a window or a ventilation hole.

For example, as shown in FIG. 12, an opening 17 may be formed to penetrate the FRP roofing material 1 in the thickness direction, and a window component 18 may be attached to the opening 17. Outer edge and opening 1 of window component 18
An appropriate fitting structure may be adopted between the inner edge portion 7 and the inner edge portion. A window glass member 19 made of a translucent material such as acrylic, glass, or polycarbonate is fitted into the window component 18. The window component 18 may be made of the same material and the same arrangement as the rib structure, or may be manufactured separately and then joined to the FRP roof material.

Further, the FRP roofing material according to the present invention may have a structure in which a refractory material is provided on at least one side in order to enhance the fire resistance.

For example, as shown in FIG. 13, a refractory material layer 20 can be provided on one surface of the roofing material 1 made of FRP.
As the refractory material, a refractory paint or a foamable refractory plastic material can be used. Foamable refractory plastic materials
When heated to a predetermined temperature, it foams and exhibits heat insulation performance.

The FRP roofing material according to the present invention as described above can be freely formed into various three-dimensional shapes. For example, as shown in FIG. 14, a polyhedral shape (a quadrangular pyramid shape in the illustrated example)
A structure in which a window component 42 is attached to a desired surface (two surfaces in the illustrated example) is formed on a roof material 41 made of FRP, and each surface is combined at an arbitrary angle as shown in FIG. It can also be configured as an FRP roofing material 43 having a complicated shape. Further, as shown in FIG. 16, an FRP roofing material 45 having a three-dimensionally shaped portion having a three-dimensional curved surface diagram 44 or the like can be used.

Even if the FRP roofing material according to the present invention is large, it can be easily integrally formed by using a predetermined mold or the like by the following method. FIG. 17 shows an example of the integral molding method according to the present invention,
For the sake of simplicity of explanation, a case where the whole is a flat FRP roofing material is shown, but by changing the mold, it can be formed into a freely shaped one.

In the method shown in FIG. 17, a plurality of core members 22 made of a foam or the like are arranged in a mold 21, and a reinforcing fiber base material 23 is arranged on at least both sides thereof. In the present embodiment, the plurality of core members 22 are arranged vertically and horizontally as viewed in plan. The ends of the rows of the arranged core materials 22 may be arranged so that the reinforcing fiber base material 23 wraps the core material 22 or, as shown in FIG. 17, a U-shaped cap-shaped reinforcing fiber base material. Material 28 may be arranged.

Each core member 22 is constituted, for example, as shown in FIG. The core member 22 has a large groove 24 serving as a path for the resin, and a number of small grooves 25 branched from the large groove 24. The resin is diffused through the large grooves 24 and the small grooves 25 in the surface direction of the reinforcing fiber base 23, and the diffused resin is impregnated into the base 23 in the thickness direction of the reinforcing fiber base 23. In this embodiment, the core member 22 itself is provided with a diffusion path for diffusing the resin in the direction of the substrate surface by the groove portion. However, separately from this structure or together with this structure, a separate member is formed. Alternatively, a sheet-like medium that diffuses the resin in the surface direction of the reinforcing fiber base may be provided. This medium can be arranged on the upper surface side of the reinforcing fiber base material 23 or on both upper and lower surfaces. The structure of the medium is not particularly limited,
A sheet-like member having a groove structure similar to that shown in FIG. 18, a sheet-like member having vertical and horizontal grooves, and a net-like member can be used.

In the embodiment shown in FIG. 18, cutout recesses 26 are formed on both sides (or four sides) of the core member 22, and the cutout recesses 26 have a U-shaped cross section as shown in FIG. A reinforcing fiber base 27 for forming a rib-like structure is arranged. At the center of the FRP roofing material, the U-shaped reinforcing fiber base material 27 forming the rib structure is abutted against each other, and at the end of the arranged core material 22, the U-shaped reinforcing fiber for the cap is formed. Substrates 28 are arranged, and these are covered with the core material 22 by the reinforcing fiber substrates 23 arranged on both sides. However, when the end portions of the arranged core members 22 are covered with the reinforcing fiber base material 23, the U-shaped cap-shaped reinforcing fiber base material 28 at the end portions is not necessarily provided. .

The upper surface of the reinforcing fiber substrate 23 is covered with a bag substrate 29, and the inside is evacuated by suction by a vacuum pump 30. Next, the valve 31 is opened, and the liquid resin 32 is injected into the mold 21 maintained in the vacuum state. The injection is performed through an edge breather 33 made of, for example, a porous material, and the suction to the pump 30 is also performed through the same edge breather 34. The resin injection position, the vacuum suction position, and the installation positions of the edge breathers 33 and 34 can be appropriately changed. For example, resin can be injected from the center of the FRP roofing material. Further, in the present embodiment, the upper surface of the reinforcing fiber base 23 is directly covered with the bag base 29. However, if necessary, a release material (not shown) which is peeled off after molding is interposed. You may. In the above embodiment, the bag base material 29 has the function of a release material. As a release material provided as necessary, resin can pass through, but is peeled off after curing and
A release material that can be removed from the RP structure (such as a nylon taffeta woven sheet) is preferred. Furthermore, a rigid plate such as an iron plate may be arranged between the bag base material 29 and the upper surface of the mold of the reinforcing fiber base material 23.

The resin injected is, as described above, the core material 2
While being rapidly diffused in the surface direction of the reinforcing fiber base material 23 along the second large groove 24 and the small groove 25, it is gradually impregnated in the thickness direction of the reinforcing fiber base material 23. At this time, at the same time, the U-shaped reinforcing fiber base materials 27 and 2 forming the rib structure and the cap are formed.
8 is also impregnated with a resin, and the rib structure and the cap are integrally formed. The impregnated resin is hardened at room temperature and possibly by heating to complete the FRP roofing material.
After curing, the bag substrate 29 is removed and the cured FRP
The structure is removed from the mold 21. In this way, the FRP roofing material is integrally formed.

[0052]

As described above, according to the roofing material made of FRP of the present invention, there is no possibility of rusting, and it is possible to exhibit sufficiently high strength, rigidity and heat insulating property while being light in weight, It is possible to provide a very practical and highly useful roofing material that can contribute to the improvement of earthquake resistance and can be easily formed into any shape having high designability.

If a phenol resin is used as the matrix resin of the FRP, or if a refractory material is provided on the surface, a roof material having excellent fire resistance can be obtained.

Further, according to the method of manufacturing an FRP roofing material of the present invention, even if the FRP roofing material having excellent performance as described above is large, it can be substantially integrally molded. Can be easily and inexpensively manufactured.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of an FRP roofing material according to an embodiment of the present invention.

FIG. 2 is a partial longitudinal sectional view of an FRP roofing material according to each of the other embodiments of the present invention.

FIG. 3 is a partial vertical sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 4 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 5 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 6 is a perspective view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 7 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 8 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 9 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 10 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 11 is a partial vertical sectional view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 12 is a plan view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 13 is a partial longitudinal sectional view of an FRP roofing material according to still another embodiment of the present invention.

14A is a plan view of an FRP roofing material according to still another embodiment of the present invention, and FIG. 14B is a side view.

15A is a plan view of an FRP roofing material according to still another embodiment of the present invention, and FIG. 15B is a side view.

FIG. 16 is a perspective view of an FRP roofing material according to still another embodiment of the present invention.

FIG. 17 is a schematic vertical sectional view showing a method for manufacturing an FRP roofing material according to an embodiment of the present invention.

18 is an enlarged perspective view of a core material used in the manufacturing process of FIG.

[Explanation of symbols]

1,11 FRP roofing material 2,2a Gap 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3
i plate 4, 4a, 4b, 4c, 4d, 4e Rib structure 5 Swelling portion or dent portion 12 Core material 13 Ramen structure 14, 14a, 14b Connecting member 15 Bolt 16, 16a Universal joint 17 Opening 18 Window configuration Member 19 Window glass member 20 Refractory material layer 21 Mold 22 Core material 23 Reinforcement fiber base material 24, 25 Groove 26 Recess 27 Reinforcement fiber base material for forming a rib structure 28 Cap-shaped reinforcement fiber base material 29 Bag base material 30 Vacuum pump 31 Valve 32 Resin 33, 34 Edge breather 41, 43, 45 FRP roofing material 42 Window component 44 Three-dimensional curved surface

Claims (16)

[Claims] 1. A roofing material made of FRP, wherein a pair of plates at least one of which is made of FRP are arranged with a gap, and a rib structure for joining the two plates is interposed in the gap. 2. The FRP roofing material according to claim 1, wherein the dimension of the gap is substantially constant in the plate extending direction. 3. The FRP roofing material according to claim 1, wherein the size of the gap changes in the plate extending direction. 4. The at least one plate is formed in a folded plate shape in which peaks and valleys are alternately arranged.
4. The FRP roofing material according to any one of 3. 5. A filler having a lower specific gravity than any of the pair of plates is disposed in the gap.
4. The FRP roofing material according to any one of the above. 6. A connecting member connected to another member is attached to an outer surface of at least one of the plates.
5. The FRP roofing material according to any one of 5. 7. The FRP roofing material according to claim 6, wherein the connecting member is attached to a position corresponding to the installation position of the rib structure. 8. The FRP roofing material according to claim 6, wherein the connecting member has a universal joint. 9. The FR according to claim 1, wherein the rib structure comprises a truss or a ramen structure.
P roofing material. 10. The FRP roofing material according to claim 1, which has an opening penetrating in a thickness direction. 11. The FRP roofing material according to claim 10, wherein a window component is attached to the opening. 12. The FRP roofing material according to claim 1, wherein the matrix resin of at least one plate is made of a phenol resin. 13. The FRP roofing material according to claim 1, wherein a refractory material is provided on at least one side. 14. The FRP roofing material according to claim 1, wherein at least one of the plates has a polyhedral solid portion. 15. The FRP roofing material according to claim 1, wherein at least one plate has a three-dimensionally shaped portion having a three-dimensional curved surface portion. 16. An F according to claim 1, wherein
When molding a plate made of at least one FRP of RP roofing material, a reinforcing fiber base material is arranged in a mold, and the inside covered with the bag base material is evacuated after covering the whole with the bag base material, A method of manufacturing a roofing material made of FRP, characterized by molding by injecting a resin and diffusing it to the surface of the reinforcing fiber base material and impregnating the reinforcing fiber base material.