Interior construction method using sheet-shaped building materials, and interior material unit

Abstract

To provide an interior construction method and interior material unit using a plate-shaped building material that is significantly lighter while possessing performance equivalent to gypsum board, thereby achieving ease of installation equivalent to or better than gypsum board, and enhancing safety after installation. [Solution] The interior construction method comprises two sheet materials 20 each formed in the shape of a flat plate from recycled paper, and a core member 10 formed from recycled paper to have a corrugated cross-section, sandwiched between the sheet materials 20, with each vertex of the corrugated cross-section of the core member 10 joined to the sheet materials 20, and at least one of the two sheet materials 20 and the core member 10 being formed as a laminate with metal foil, a step of preparing a plate-shaped building material, a step of shaping the plate-shaped building material to a predetermined shape and dimensions, and a step of fixing a plurality of the plate-shaped building materials to the base material of the building's interior with screws.

Description

Technical Field

[0001] The present invention relates to a method for installing an interior using plate-shaped building materials and an interior material unit.

Background Art

[0002] Conventionally, as ceiling materials, gypsum boards having appropriate heat insulation and sound insulation properties have been used. However, while having properties suitable as ceiling materials, a gypsum board having standard dimensions of 12.5 mm × 910 mm × 1820 mm weighs several tens of kilograms per sheet, and a great deal of labor is required to attach it to a ceiling base material composed of a light steel frame or the like. Also, even after construction, accidents have occurred in which the ceiling material of the gypsum board has been damaged and fallen due to an earthquake accompanied by a seismic intensity of 7. Thus, for the ease of construction and safety after construction, there has been a demand for a new ceiling material that is lightweight while ensuring performance equivalent to that of a gypsum board.

[0003] In response to such demands, for example, the proposal of Patent Document 1 has been made. Patent Document 1 describes a ceiling material composed of a cardboard panel using an inorganic fiber mixed paper for a liner adhered to both the front and back sides of a corrugated sheet, aiming to provide a ceiling material excellent in lightness and ease of production.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, while Patent Document 1 suggests that weight reduction has been achieved with the ceiling material, it does not mention whether the low moisture absorption, flame retardancy, or sound insulation properties of the inorganic fiber blended paper can be equivalent to those of gypsum board. Furthermore, it is not clear whether the installation procedure can be carried out in the same way as that of gypsum board, which workers are familiar with. The same requirements apply to wall materials for constructing walls as to the ceiling material described above.

[0006] The present invention aims to provide an interior construction method and interior material unit using a plate-shaped building material that is significantly lighter while possessing performance equivalent to that of gypsum board, thereby achieving ease of construction equivalent to or better than that of gypsum board and enhancing safety after construction. [Means for solving the problem]

[0007] A method for constructing interior finishes using a plate-shaped building material according to one aspect of the present invention comprises the steps of: preparing a plate-shaped building material having a first sheet and a second sheet, each formed in a flat shape from recycled paper, and a third sheet, which is sandwiched between the first sheet and the second sheet and is formed from recycled paper to have a corrugated cross-section, wherein each apex of the corrugated cross-section of the third sheet is joined to the first sheet or the second sheet, and at least one of the first sheet, the second sheet, and the third sheet is formed as a laminate with metal foil; shaping the plate-shaped building material to a predetermined shape and dimensions; and fixing a plurality of the plate-shaped building materials to a base material for the interior finish of a building with screws.

[0008] An interior material unit according to another aspect of the present invention comprises a first sheet and a second sheet, each formed in the shape of a flat plate from recycled paper, and a third sheet, which is sandwiched between the first sheet and the second sheet and is formed from recycled paper to have a corrugated cross-section, wherein each apex of the corrugated cross-section of the third sheet is joined to the first sheet or the second sheet, and at least one of the first sheet, the second sheet and the third sheet is a molded body formed by molding a plate-shaped building material, which is formed as a laminate with metal foil, into a predetermined shape, and a surface finishing layer formed on the surface of the molded body with a paste-like finishing material. [Effects of the Invention]

[0009] According to the present invention, a method for constructing interior finishes using a plate-shaped building material, and an interior material unit, are provided, which have performance equivalent to that of gypsum board but are significantly lighter, thereby achieving ease of construction equivalent to or better than that of gypsum board, and improving safety after construction. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing an example of the overall configuration of a ceiling material according to one embodiment of the present invention. [Figure 2] Figure 1 is a schematic cross-sectional view of the ceiling material. [Figure 3] Figure 1 is a schematic diagram illustrating the installation state of the ceiling material. [Figure 4] This is a cross-sectional view illustrating the state in which ceiling material is attached to the ceiling base material. [Figure 5] This is a schematic cross-sectional view illustrating the installation of heavy objects on ceiling substrates. [Figure 6] This is a schematic plan view illustrating the installation state of a wall material according to one embodiment of the present invention. [Figure 7] Figure 6 is a schematic diagram illustrating the state of the wall material after surface finishing has been carried out. [Modes for carrying out the invention]

[0011] The present invention will be described below with reference to the drawings, in accordance with its embodiments. However, the present invention is not limited to the embodiments described below. Furthermore, the figures referenced in the following description merely provide a schematic representation of the shape, size, and positional relationships to the extent that the contents of this disclosure can be understood. In other words, the present invention is not limited to the shapes, sizes, and positional relationships illustrated in the figures.

[0012] <Composition of plate-shaped building materials> First, an example of the configuration of a plate-shaped building material according to one embodiment of the present invention will be described. Figure 1 schematically shows an example of the overall configuration of the plate-shaped building material according to this embodiment. As shown in Figure 1, the plate-shaped building material 1 typically has a rectangular planar shape, and when used as a ceiling material, for example, the standard dimensions are t=4.0mm, L1=1820mm, L2=910mm, which is the so-called 3x6 plate size. In the case of the 3x6 plate size, the weight is approximately 2.35kg. However, the planar shape is not limited to a rectangle, and may be a polygon such as a triangle or hexagon, or a curved shape such as a circle. The dimensions in such cases can also be determined according to the design of the ceiling and wall surface.

[0013] The plate-shaped building material 1 has a core member 10 as a third sheet, which is continuously bent so that its cross-section is corrugated, and two sheet materials 20 as a first sheet and a second sheet, which are provided so as to sandwich the core member 10. Figure 2 schematically shows the plate-shaped building material 1 of Figure 1 as viewed from the cross section of the core member 10.

[0014] In this embodiment, a sheet material 20, formed by sandwiching and bonding aluminum foil as a metal sheet 30 between recycled paper, is placed above and below the core member 10, which is obtained by bending the sheet material 20 to form a wave shape at a predetermined pitch. The wave-shaped protrusions of the core member 10 come into contact with the sheet material 20 above and below it, and these contact points are bonded with a predetermined adhesive to form a plate-like building material 1. The core member 10 is also formed by sandwiching and bonding aluminum foil between recycled paper, similar to the sheet material 20. Note that it is not necessary to sandwich the aluminum foil between all of the sheet material 20 and the core member 10; it is possible to provide it in at least one of them. As will be described later, when the plate-like building material 1 is fixed to the base material with screws or the like, the screws penetrate the aluminum foil, thereby creating bonding strength between the plate-like building material 1 and the screws. Note that it is also possible to use metal foil other than aluminum.

[0015] <Examples of use as ceiling material> Figure 3 schematically shows the construction process for attaching the plate-shaped building material 1 to the lightweight steel bar 100, which is the ceiling base material. For example, the lightweight steel bar 100, which has an angle-shaped (approximately U-shaped) cross-section, is fixed to a suspension member 150 extending downward from a ceiling structure (not shown) using an appropriate structure.

[0016] The plate-shaped building material 1 as a ceiling material can be fixed to a ceiling base material such as a lightweight steel bar 100 in the same configuration as a gypsum board. In the following, an explanation will be given on the premise that the lightweight steel bar is used as the base, but a wooden frame (wooden axis) can also be used as the base material. In FIG. 3, at the four corners of the plate-shaped building material 1, screws 40 of an appropriate length and nominal diameter are used to fasten to the lightweight steel bar 100. FIG. 4 shows a schematic cross-sectional view of this fastening part. As shown in FIG. 4, the configuration example illustrated in FIG. 3 fastens the plate-shaped building material 1 to the angled lightweight steel bar 100 from below using the screw 40. This is the same as the construction procedure for attaching a conventional gypsum board to a ceiling base material, and the operator does not need to acquire a new different construction operation due to the adoption of the plate-shaped building material 1, and it is excellent in construction ease. Also, since the weight of the plate-shaped building material 1 is suppressed to about 1 / 6 of that of a gypsum board of the same size, the operator can perform the attachment work with significantly less labor than in the case of a gypsum board. Therefore, in recent years when it has become difficult to secure on-site workers due to the progress of the low birthrate and aging population, there is an advantage that even relatively weak elderly people and female workers can perform the construction work.

[0017] Also, regarding the weight reduction of the plate-shaped building material 1, even assuming that the plate-shaped building material 1 may fall off from the lightweight steel bar 100 due to an earthquake or the like after construction, its safety is improved due to its light weight. Note that the Japan Architectural Institute recognizes that ceiling falls can also occur due to moisture intrusion into the ceiling material, such as accidents where the ceiling material absorbs condensed water and falls off, in addition to earthquakes. The high moisture permeability resistance of this building material can also reduce the risk of its falling off.

[0018] Another feature of the plate-shaped building material 1 is that it is excellent in workability at the site. This plate-shaped building material 1 can be easily cut with a utility knife without using any special tools. Almost no dust is generated during that time. The plate-shaped building material 1 can be attached to the lightweight steel base with screws using ordinary tools. At this time, ordinary putty treatment is performed on the screw head.

[0019] The method of attaching the board-shaped building material 1 can be selected from options such as seamless, gap-joint, or PVC joiner. The surface finish of the board-shaped building material 1 can be selected from options such as painting, wallpapering, or plastering. The edges of the board-shaped building material 1 can be chamfered by pressing along the edges with a hard spatula or similar tool, without the need for special tools. By performing this on-site chamfering before fixing to the substrate, the joints between the board-shaped building materials 1 can be made less noticeable. Small damage to the board-shaped building material 1 can also be repaired by applying putty.

[0020] Next, we will describe an example of a configuration when installing heavy objects on the ceiling. Sometimes, it is necessary to install heavy objects on the ceiling, such as lighting fixtures like downlights. Since such heavy objects may exceed the load-bearing capacity of the plate-shaped building material 1, in such cases, it is necessary to configure the system so that the load is directly supported by the lightweight steel bars 100. Figure 5 shows an example of a configuration when installing downlights DL on the ceiling. Brackets 110, each having a roughly L-shaped cross-section, are fixed to adjacent lightweight steel bars 100 from below with screws or the like. For simplicity, the screws are not shown in the diagram and are simply represented by dashed lines. Between opposing brackets 110, a gypsum board 200, processed to match the spacing, is fixed to the brackets 110 with screws. The downlight DL is fixed to the mounting holes in the gypsum board 200 using an appropriate structure, so that the weight of the downlight DL is supported by the lightweight steel bars 100 via the gypsum board 200. Furthermore, when supporting downlights DL etc. with gypsum board 200 in this manner, the shape and dimensions of the plate-shaped building material 1 adjacent to the downlight DL installation location can be easily adjusted by cutting it with a cutter as needed. No special tools are required in this case. In addition, support members with the required strength other than gypsum board 200 can also be used.

[0021] <Examples of use as wall material> Figure 6 shows a schematic plan view of an example of construction when using the plate-shaped building material 1 as a wall material. Figure 6 is a plan view of the interior, including the walls, seen from above, with three studs 300 made of lightweight steel or the like erected. Here again, the explanation below assumes that lightweight steel bars are used as the base material, but wooden frame (timber frame) can also be used as the base material. The plate-shaped building material 1 used as a wall material has a shape that curves from the top to the bottom of the figure. One of the features of the plate-shaped building material 1 is that it can be easily deformed to create a desired curved surface, as shown in Figure 6. Due to this feature, when used as a wall or ceiling material, not only monotonous flat surfaces but also highly decorative curved surfaces can be easily created.

[0022] Figure 7 schematically shows the surface finish of the board-shaped building material 1 as an installed wall material. The sheet material 20 forming the surface of the board-shaped building material 1 is recycled corrugated cardboard, which is suitable for painting (acrylic emulsion paint, etc.) and wallpapering, and is particularly compatible with water-containing paste-like plaster used in plastering work, allowing for a beautiful surface finish with normal plastering work. More specifically, plastering finishes that use water in the construction process are unsuitable for substrates that are susceptible to moisture, but this board-shaped building material 1 can withstand normal plastering finishes due to the moisture resistance effect of the aluminum foil. When applying a finish material such as plaster to a thickness of about 2-3 mm, the basic procedure is to apply a neutral primer before applying the finish coat. When applying a thicker coat, such as in rammed earth finishes, a cation, a material used to adjust the substrate for mortar painting, should be applied as the bottom layer. This is the same method as applying a finish material to gypsum board.

[0023] One of the features of the plate-shaped building material 1 of this embodiment is that it allows for easy construction of curved ceilings and walls. By arranging and assembling lightweight steel frames for curved ceilings and walls, the plate-shaped building material 1 can be bent by hand and screwed along the lightweight steel frames to form a curved surface. Existing gypsum boards for curved processing often require being thoroughly soaked in water before bending, but in that case, the weight of the gypsum board increases due to the moisture, making construction more difficult than for flat surfaces. In this respect, the ease of construction of this plate-shaped building material 1 is extremely useful. By directly applying plastering base material and finishing material to the surface of the plate-shaped building material 1 that has been formed into the desired curved shape, it is possible to finish curved ceilings and walls in the shortest possible number of steps.

[0024] <Interior material unit> The board-shaped building material 1 used as interior material can be pre-processed as a material, such as adjusting its shape and dimensions and creating curved surfaces, before being brought to the construction site. Then, as illustrated in Figure 7, it is possible to complete the interior material unit 500 by pre-painting, plastering, or other surface finishing using a trowel 400, for example. In this case, at the construction site, the only work required is to attach the interior material unit 500 to the already installed base material such as studs 300 with adhesive, thus completing the on-site construction work and streamlining the process. In other words, the interior material unit 500 is produced in a factory or similar facility to the point where only the minimum necessary steps, such as final assembly to the base material, remain at the construction site. For surface finishes, wallpapering can be somewhat difficult depending on the type of wallpaper used, and plastering requires painting skills. Furthermore, the weight increases depending on the finishing material applied. However, since this board-shaped building material 1 is lighter than existing building materials such as gypsum board, even after skilled craftsmen have applied or painted it in the factory, the finished product is still lighter than existing building materials, thus reducing the burden of transportation from the factory to the construction site.

[0025] In addition to being used as an interior material for ceilings and walls, the plate-shaped building material 1 can also be used for purposes such as a base for furniture tabletops. By using the plate-shaped building material 1 of this embodiment, it is possible to diversify the design of furniture through curved surface processing with a small bending radius and surface finishing by plastering work, etc.

[0026] <Examples> Here, we will describe a plate-shaped building material 1 according to one embodiment of the above-described example. The main specifications of the plate-shaped building material 1 according to this embodiment are as follows. • Dimensions: Rectangle with a thickness of 4.0 mm, a length of 1820 mm, and a width of 910 mm. The structure consists of a three-layer sheet made by sandwiching and bonding an aluminum foil approximately 0.02 mm thick between two sheets of recycled corrugated cardboard. The thickness of the upper and lower (outer) flat sheet material 20 is approximately 0.5 mm, the thickness of the corrugated core material 10 sandwiched in the middle is approximately 3 mm, and the overall thickness of the main board-shaped building material 1 is approximately 4 mm. The weight of the main board-shaped building material 1 is 1 m 2 Each weighed approximately 1.4 kg. When fixing such plate-shaped building material 1 to a ceiling base material made of lightweight steel bars with screws, as an example without limitation, rib screws with a length of 20 mm and a nominal diameter of 3 mm can be used. When fixing it to the aforementioned studs 300 as a wall material with screws, screws of similar specifications can be used.

[0027] The main performance characteristics confirmed for the plate-shaped building material 1 according to this embodiment are shown below. (1) Fire resistance This board-shaped building material 1 conforms to the performance evaluation standards of Article 1, Item 5 [Semi-noncombustible materials] of the Building Standards Act Enforcement Order.

[0028] (2) Breathability Because aluminum foil is interposed in the thickness direction of the plate-shaped building material 1, the water vapor resistance is high, preventing the plate-shaped building material 1 from corroding and coming loose from the screws. Therefore, deterioration over time and the resulting detachment are prevented. Specifically, the water vapor resistance Zp ≥ 500 [ng / (m 2It has a moisture permeability of (·s·Pa), which is about 1000 times that of typical gypsum board.

[0029] (3) Sound absorption The average NRC sound absorption coefficient (reverberation room method) for frequencies between 50 and 2,000 Hz was 0.08, which is roughly the same as that of typical decorative gypsum board. To improve the sound absorption coefficient, rock wool sound-absorbing panels can be attached to the interior side, a method similar to that used for typical gypsum board.

[0030] (4) Sound insulation (sound transmission loss) The frequency range of human speech is generally 500-1000 Hz. In the case of the plate-shaped building material 1 in this embodiment, the results were 20 dB at 500 Hz, 26 dB at 1000 Hz, and an average of 20 dB from 100 to 2500 Hz. It has been confirmed that the sound insulation effect is improved when sound insulation material (thermal insulation material) is used in combination.

[0031] (5) Impact resistance (a) Wall pressure test When the maximum value of 1765N, which was used for the certification of high-quality (BL) parts, was applied, no cracks or fractures occurred, and only slight deflection occurred. It was confirmed that it could be used as a wall material without any problems.

[0032] (b) Material impact test A test was conducted in which a 500g steel ball was dropped from a height of 500mm onto the surface of plate-shaped building material 1 to check the degree of denting upon impact. The plate-shaped building material 1 did not break or shatter, confirming that it possesses the flexibility to absorb impact.

[0033] (c) Wall impact test When a concentrated load was applied to it as a partition wall, the residual deformation after the impact was almost zero, confirming that there were no issues with using it as a partition wall under a lightweight steel frame.

[0034] (6) Material bending test When forming a curved surface, we conducted tests to verify the load required for bending and the amount of deflection in different bending directions. We confirmed that in the direction perpendicular to the steps (the paper width direction, the direction on which waves are not visible when viewed from the side) and the direction perpendicular to the steps (the roll-like direction, the direction on which waves are visible when viewed from the side), the load required for bending was slightly greater, but the amount of deflection at the bending failure load was also larger in the former direction.

[0035] (7) Thermal resistance (thermal insulation) According to the standard measurement method of the Japanese Industrial Standards (JIS), the measured value of thermal resistance is 0.041 [m 2 The value obtained was [·K / W]. This value was almost equivalent to that for typical gypsum board (approximately 0.043 or higher for a thickness of 9.5 mm, and approximately 0.057 for a thickness of 12.5 mm).

[0036] As explained above, it has been confirmed that the plate-shaped building material 1 according to this embodiment achieves a significant reduction in weight compared to a typical gypsum board with a thickness of 12.5 mm while maintaining equivalent performance in various aspects.

[0037] <Regarding environmental impact> Reducing the potential environmental impact of industrial products is a crucial issue.

[0038] The plate-shaped building material according to the present invention, after fulfilling its initial purpose as interior ceiling and wall material, can be recycled instead of being sent to landfills. When this building material, once discarded, is combined with waste plastic, it can be reused as a "foaming inhibitor" (a type of additive used in metal refining in blast furnaces. When added to the blast furnace, it suppresses a phenomenon called foaming). This recycling method is called chemical recycling and can be carried out in small quantities.

[0039] One important consideration in recycling is whether the material can be recycled easily from its current state of use. In the case of chemical recycling mentioned above, as evidenced by the fact that a mixture of waste plastic and this material becomes a raw material for a foaming inhibitor, even if the wallpaper, which is largely plastic-based, is attached to the building material, it can be recycled as is. Similarly, when combining rock wool, which functions as a sound-insulating material, with this building material, by installing it without using adhesive, the building material can be chemically recycled and the rock wool can be materially recycled after separation of the two materials following use.

[0040] The benefits of recycling include not only reusing materials, but also addressing the problem of insufficient landfill space for waste.

[0041] The Japan Aluminum Association's website states that "aluminum foil with a thickness of 6-10 μm is thought to be almost completely eroded in about 4-5 years, turning into alumina and returning to the soil."

[0042] The interior construction method using the plate-shaped building material according to the embodiment of the present invention described above comprises the steps of: preparing a plate-shaped building material 1 having two sheet materials 20 each formed in the shape of a flat plate from recycled paper, and a core member 10 formed from recycled paper to have a corrugated cross-section, sandwiched between the sheet materials 20, with each vertex of the corrugated cross-section of the core member 10 joined to the sheet materials 20, and at least one of the two sheet materials 20 and the core member 10 being formed as a laminate with metal foil; shaping the plate-shaped building material 1 to a predetermined shape and dimensions; and fixing a plurality of the plate-shaped building materials 1 to the base material of the building interior with screws.

[0043] This makes it significantly lighter than existing interior materials such as gypsum board, simplifies installation, and improves safety after installation.

[0044] Before fixing the plate-shaped building material 1 to the base material, the process may include a step of crushing the peripheral edge of the plate-shaped building material 1 along its peripheral edge to chamfer the thickness direction of the peripheral edge of the plate-shaped building material 1.

[0045] In this way, the joints between the plate-shaped building materials 1 can be made less noticeable with a simple process that does not require the use of special tools.

[0046] The process may also include a step of forming a surface finishing layer by applying a paste-like finishing material onto one of the two sheet materials 20 that constitute the interior surface of the plate-shaped building material 1.

[0047] In this way, a surface finishing layer can be formed by plastering, similar to existing interior materials.

[0048] The plate-shaped building material 1 has plasticity that enables a predetermined minimum bending radius and can be installed continuously to form a curved surface along the interior surface of the building.

[0049] This method allows for the creation of an aesthetically pleasing interior design that seamlessly connects the ceiling and walls.

[0050] The interior material unit of this embodiment comprises two sheet materials 20, each formed in the shape of a flat plate from recycled paper, and a core member 10, which is formed from recycled paper to have a corrugated cross-section and is sandwiched between the sheet materials 20. Each apex of the corrugated cross-section of the core member 10 is joined to the sheet materials 20. At least one of the two sheet materials 20 and the core member 10 is a molded body formed by molding a plate-shaped building material, which is formed as a laminate with metal foil, into a predetermined shape, and a surface finishing layer formed on the surface of the molded body with a paste-like finishing material.

[0051] In this way, units that have been finished as interior materials are delivered to the construction site, which shortens construction time and improves the efficiency of interior finishing work.

[0052] Furthermore, the technical scope of the present invention is not limited to the embodiments described above, and other modifications, applications, etc., are also included within the scope of the claims. [Explanation of Symbols]

[0053] 1. Plate-shaped building materials 10 Core member 20 Sheet material 30 Metal Sheets 40 screws 100 Lightweight Steel Bar 110 bracket 200 Support Member 300 studs 400 trowels 500 Interior Material Units

Claims

1. The first sheet and the second sheet are formed in a flat shape from recycled paper, The process of preparing a plate-shaped building material comprising: a third sheet formed from recycled paper to have a corrugated cross-section, sandwiched between the first sheet and the second sheet, wherein each apex of the corrugated cross-section of the third sheet is joined to the first sheet or the second sheet, and at least one of the first sheet, the second sheet, and the third sheet is formed as a laminate with metal foil; The process of forming the aforementioned plate-shaped building material into a predetermined shape and dimensions, The process involves fixing multiple plate-shaped building materials to the interior base material of the building with screws, An interior construction method that has [a certain characteristic].

2. The interior construction method according to claim 1, further comprising the step of crushing the peripheral edge of the plate-shaped building material along its peripheral edge to chamfer the thickness direction of the peripheral edge of the plate-shaped building material before fixing the plate-shaped building material to the base material.

3. The process includes a step of forming a surface finishing layer by applying a paste-like finishing material to the first sheet or the second sheet that constitutes the interior surface of the plate-shaped building material. The method for constructing interior finishes according to claim 1.

4. The interior construction method according to claim 1, wherein the plate-shaped building material has plasticity that enables a predetermined minimum bending radius and is installed continuously to form a curved surface along the interior surface of the building.

5. An interior material unit comprising: a first sheet and a second sheet, each formed in a flat shape from recycled paper; a third sheet, sandwiched between the first and second sheets, formed from recycled paper to have a corrugated cross-section, wherein each apex of the corrugated cross-section of the third sheet is joined to the first or second sheet; and at least one of the first, second, and third sheets is a molded body formed by molding a plate-shaped building material, which is formed as a laminate of metal foil, into a predetermined shape; and a surface finishing layer formed on the surface of the molded body by a paste-like finishing material.

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