JP2000303652A - Joint decoration method and reentrant-angle decoration method and building board for executing these method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decorate a joint without using a masking tape. SOLUTION: In a joint 20 formed between each of the mutually adjacent backing surfaces of a pair of the building boards 2, 2, in which the backing surfaces are formed to one side edge sections and protective sheets 8 are disposed so as to cover the surfaces of decorative layers 6 excepting the backing surfaces 10 while side faces 3 arranged adjacently in parallel on the surface of a foundation 100, is filled with a caulking material 22 and the surface of the sheet 8 is levelled in a pair of the building boards 2, 2 composed of the laminates of base layers 4, the decorative layers 6 and the protective sheets 8 respectively. The caulking material 22 is cured, and each of the protective sheets 8 is peeled from the surfaces of the decorative layers 6 of the building boards 2, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for jointly dressing a pair of architectural boards which are arranged side by side on the surface of a foundation with their side surfaces adjacent to each other, and with a predetermined angle so that a corner is formed between them. The present invention relates to a method of making a corner of a pair of architectural boards arranged on a surface of a base, and a architectural board for performing these methods.

[0002]

BACKGROUND OF THE INVENTION In the traditional style of building interiors or exteriors, plastering, wet finishes such as plaster, dolomite plaster, jujube or cement are applied to the surface of the substrate. Such plastering work is a skilled artisan work and is relatively expensive. Further, since the wet finishing material requires a relatively long curing time after application, the plastering work requires a relatively long construction period. Therefore, recently, instead of applying a wet finishing material, it has been proposed to attach a building board having a decorative layer on the surface to the surface of the base. Examples of a building board that can be suitably used include those disclosed in Japanese Patent Application Laid-Open No. 9-85879 filed by the present applicant, Tokuyama Corporation. This architectural board comprises a rectangular plate-shaped base layer and a decorative layer applied to the surface of the base layer.
The base layer is preferably formed from a breathable board such as a calcium silicate board or a gypsum board, and the decorative layer is preferably formed from a solidified curable composition. When using such building boards, there is no need to apply a wet finish to the surface by plastering due to the provision of a decorative layer, thus reducing construction costs and shortening the construction period can do.

When using the above-mentioned building board,
If the boundaries or joints of the architectural boards arranged side by side on the surface of the foundation with the side surfaces adjacent to each other are exposed as they are, an undesired appearance is exhibited. Therefore, it is necessary to appropriately make up the joints, and it may be intended to partially apply plastering only to the joint area to make up the joints. A typical example of the conventional method of applying a plaster to only the joint area to partially apply the joint has been performed as follows. That is, when performing interior or exterior construction with a pair of architectural boards consisting of a base layer and a decorative layer applied to the surface of the base layer, first, one side of each surface of the base layer (therefore, the surface of the decorative layer) The boundary corner between the edge and the corresponding side is cut to form a receding surface (chamfered surface) composed of an inclined surface. The cutting of the receding surface is generally performed using a chamfered canner. Next, a band-shaped masking tape having a fixed width is attached to one side edge of each surface of the base layer along a boundary with the receding surface. After the masking tape has been applied to the surface of each side edge of the base layer, each of the building boards is arranged in parallel on the surface of the substrate, with the mutual sides adjacent. Caulking material is filled into joints of a groove structure in which a cross section formed by each of the adjacent inclined surfaces has a substantially V shape. The filling of the caulking material is performed by discharging the caulking material from a nozzle provided at the tip of a container having a tube structure containing the caulking material. After filling the joint with the caulking material, the surface is smoothed with a special spatula to perform a finishing operation. The caulking material protruding from the joint is received on each surface of the masking tape. In this state, the caulking material is left for a predetermined time to cure the caulking material, and then the masking tape is peeled off from the surface of the corresponding decorative layer of the architectural board to complete the joint makeup.

[0004] On the other hand, a predetermined angle (typically, a corner) is formed so that one side surface of one building board abuts one side surface of the other building board to form a corner between them. 90
°), a pair of architectural boards placed on the surface of the base also apply a masking tape along the corners to each surface of the base layer forming the corners, and then fill the corners with a caulking material. Then, after the surface is smoothed by a special spatula, the caulking material is hardened by being left for a predetermined time. After the caulking material has cured, the in-corner makeup is accomplished by peeling each of the masking tapes from the surface of the corresponding building board decorative layer.

[0005]

As described above, when applying the makeup to joints of a pair of building boards arranged side by side on the surface of the base with the side surfaces adjacent to each other, each of the pair of building boards is applied with makeup. One each, a total of two masking tapes must be prepared. Therefore, the cost increases and the parts management becomes necessary.
In addition, since it is necessary to attach and detach a masking tape to and from each surface of a pair of building boards, the burden of labor increases, the construction time increases, and the construction cost also increases. Furthermore, it is necessary to perform a cutting operation for cutting a boundary corner between a side edge and a corresponding side surface on each surface of the building board to form a receding surface formed of an inclined surface. As the burden of labor increases, the construction time increases, and the construction cost also increases.

On the other hand, when makeup is applied to the corners of a pair of architectural boards disposed on the surface of the base at a predetermined angle so that the corners are formed between the corners, the makeup and the appearance of the corners may be reduced. The caulking material cannot be filled sufficiently. As a result, a gap may be generated in the corner due to a temporal change of one and / or the other of the building board, and the appearance is deteriorated. In other words, it is difficult to stably secure the appearance at the beginning when the makeup is applied to the corner. Further, as in the case of the joint makeup described above, two masking tapes, one for each of the pair of building boards, must be prepared. Therefore, the cost increases accordingly.
Also, component management is required. In addition, since it is necessary to attach and detach a masking tape to and from each surface of a pair of building boards, the burden of labor increases, the construction time increases, and the construction cost also increases.

Recently, as a style of interior or exterior of a building, a rectangular plate-like base layer, a decorative layer applied to the surface of the base layer, and a protective sheet disposed to cover the surface of the decorative layer are provided. It has been proposed to attach an architectural board made of a laminate of the above to the surface of a base. Then, by placing each side of such a building board adjacently and arranging it in parallel along the groundwork, or by bringing one side of the building board into contact with the surface of one building board By arranging them on the ground so that the corners are formed, the wall whose surface is covered with the decorative layer can be formed much more easily than in the conventional plastering work. The protective sheet is not removed from the surface of the decorative layer at the time of construction and even after the construction until it is handed over to the user's hand, and is made to be in a laminated state so as to cover the decorative layer. The surface is protected from damage.

The present inventors have paid attention to the above-mentioned construction of the building board in which the surface of the decorative layer is covered with the protective sheet, and by utilizing the features of the construction, the conventional joint as described above is used. The present invention has succeeded in developing a novel joint makeup method, a corner makeup method, and a building board for carrying out these methods, which solve the above problems of the makeup method and the corner makeup method.

The present invention has been made based on the above-mentioned facts, and an object of the present invention is to provide a novel joint cosmetic method and a novel joint cosmetic method capable of performing a joint cosmetic without using a masking tape which has been conventionally required. To provide an architectural board for implementing the method.

[0010] Another object of the present invention is to provide a novel joint board makeup method and a corner for a building board, which can reduce the labor burden, shorten the construction time and reduce the construction cost as compared with the prior art. It is to provide a cosmetic method and an architectural board for performing the method.

Still another object of the present invention is to make it possible to sufficiently fill a caulking material, so that the appearance at the time of applying the makeup to the corner can be ensured more stably for a longer period than before. It is an object of the present invention to provide a novel method of making a corner of a building board and a building board for carrying out the method.

[0012]

According to one aspect of the present invention, a rectangular plate-shaped base layer, a decorative layer provided on the surface of the base layer, and a protective layer disposed to cover the surface of the decorative layer. A pair of architectural boards each composed of a laminate with a sheet, wherein at least one of both widthwise side edges of the laminate has a boundary corner between a surface of the laminate and a corresponding side surface removed. A pair of architectural structures, wherein a receding surface is formed and the protective sheet is disposed so as to substantially cover the surface of the decorative layer excluding the receding surface, and the side surfaces are adjacent to each other and arranged in parallel on the surface of the foundation. Filling the joint formed between each of the mutually adjacent receding surfaces of the board with a caulking material to level the surface,
And performing a makeup of a joint by peeling each of the protective sheets from a surface of the decorative layer of the corresponding building board after curing the caulking material. , Are provided.

According to another aspect of the present invention, a laminate of a rectangular plate-shaped base layer, a decorative layer provided on the surface of the base layer, and a protective sheet disposed to cover the surface of the decorative layer A pair of architectural boards, each of which is configured such that one side edge in the width direction of the protective sheet of one of the architectural boards disposed on the surface of the foundation is peeled from a corresponding surface of the decorative layer. The surface of the laminate is exposed, and the other architectural board has a receding surface formed at one side edge in the width direction of the laminate, in which a boundary corner between the surface of the laminate and a corresponding side surface is removed. And the protective sheet is disposed so as to substantially cover the surface of the decorative layer except the retreating surface, and the side on which the retreating surface is formed is exposed on one of the building boards. Placed on the surface of the base in a state of contact with the surface After applying a masking tape along the corner to the exposed surface of the decorative layer on one of the building boards of the pair of architectural boards with the formed corner, caulking is performed at the corner. After filling the material, leveling the surface, and curing the caulking material, the masking tape and the protective sheet are peeled off from the surface of the decorative layer on the corresponding building board, so that the decorative material at the corner is formed. And a method of making a corner of an architectural board.

According to still another aspect of the present invention, there are provided a base plate having a rectangular plate shape, a decorative layer provided on the surface of the base layer, and a protective sheet provided to cover the surface of the decorative layer. A retreating surface is formed on each side edge in the width direction of the laminate, in which a boundary corner between a surface of the laminate and a corresponding side surface is removed, and the protective sheet is substantially formed of the laminate. An architectural board is provided, which is disposed so as to cover the entire area of the surface of the decorative layer except for each of the receding surfaces.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, preferred embodiments of a joint board making method and a corner making method of a building board according to the present invention and a preferred embodiment of a building board for carrying out the method will be described below in more detail. Will be described. 1 to 12
, Substantially the same parts are denoted by the same reference numerals.

First, a preferred embodiment of a joint board makeup method for a building board and a building board for carrying out the method according to the present invention will be described. FIGS. 1 and 2 show a part of the interior of a building constructed by performing the joint making method according to the present invention using one embodiment of the building board according to the present invention. A pair of architectural boards 2 are fixed to the surface of a plurality of bases 100 provided in the building with an appropriate adhesive, for example, a bond 102 for woodwork. The pair of architectural boards 2 are arranged in parallel with one side 3 in the width direction adjacent to each other, preferably close to each other. The lower edge surfaces of a pair of building boards 2 arranged in parallel on the surface of the base 100 are covered with a baseboard 104, and the upper edge surfaces are covered with a peripheral edge 106. The baseboard 104 and the peripheral edge 106 are fixed to required parts by, for example, adhesion. As will be easily understood from the following description, the joints 20 formed by the receding surfaces 10 formed on the respective side edges of the building board 2 are decorated with a caulking material 22. Further, each of the protective sheets 8 is removed from the surface of the decorative layer 6 of the corresponding building board 2, and each surface of the decorative layer 6 is exposed.

Since each of the pair of building boards 2 has substantially the same configuration as each other, the configuration of one of the building boards 2 will be described. Referring to FIGS. 2 and 3, architectural board 2 is provided so as to cover rectangular plate-shaped base layer 4, decorative layer 6 applied to the surface of base layer 4, and the surface of decorative layer 6. It is composed of a laminate with the protective sheet 8. On both side edges in the width direction of the laminate, receding surfaces 10 (surfaces receding to the rear surface side with respect to the surface of the laminate) are formed, each of which has a boundary corner between the surface of the laminate and the corresponding side surface 3 removed. ing. The protective sheet 8 is disposed so as to cover substantially the entire surface of the decorative layer 6 except for each of the receding surfaces 10.

More specifically, the base layer 4 in the illustrated embodiment is a commercially available gypsum board, and a core 12 formed by mixing a small amount of inorganic fine aggregate and the like into hemihydrate gypsum as a main component. And the cardboard 14 covering the front and back surfaces and both side surfaces of the core 12 (one end surface and the other end surface in the longitudinal direction of the core 12 are exposed without being covered with the cardboard 14). On both side edges in the width direction of the base layer 4, chamfered surfaces 16 in a form in which a boundary corner between the surface of the base layer 4 and the corresponding side surface 3 are removed are formed. Chamfer 1
Each of the base layers 6 is formed from a flat inclined surface in the illustrated embodiment, and is formed to extend from one end to the other end in the longitudinal direction of the base layer 4. The decorative layer 6 is formed from a solidified curable composition. Such a decorative layer 6 can be suitably formed by laminating a kneaded product of the curable composition and water on the surface of the base layer 4 in an appropriate manner, then curing and solidifying. In the illustrated embodiment, the decorative layer 6 is disposed so as to cover substantially the entire area of the surface of the base layer 4 including the chamfered surfaces 16 with a predetermined thickness. The protective sheet 8 has a substantially rectangular shape and the decorative layer 6
Is substantially detachably disposed so as to cover a portion covering each of the chamfered surfaces 16, that is, all other regions except each of the retreating surfaces 10. Laminate, and therefore building board 2
Each of the receding surfaces 10 is defined by the surface of the decorative layer 6 covering each of the chamfered surfaces 16 of the base layer 4 (a flat inclined surface extending along the chamfered surface 16). Both side edges in the width direction of the protective sheet 8 are positioned so as to extend from one end to the other end of the base layer 4 along a boundary between the corresponding receding surface 10 and the other surface of the decorative layer 6 except the receding surface 10. Can be As is clear from the above description, the surface of the decorative layer 6 which is the surface of the building board 2 has substantially only the retreating surface 10 exposed, and substantially the entire other flat surface has the protective sheet 8.
It is constituted so that it may be covered by.

The base layer 4 of the building board 2 is made of a suitable material widely used as a base material in a building, for example, a plaster board, a calcium silicate board,
Asbestos cement calcium silicate board, wood plywood, steel plate,
It can be formed from wood wool cement board, hollow cement board, foam cement board, concrete board, mortar board and the like. In particular, it is preferable to form the base layer 4 from a breathable board such as a gypsum board, a calcium silicate board, an asbestos cement calcium silicate board, or a wood plywood. Such a breathable board can be used as the base layer 4 as it is in a commercially available form. The base layer 4 in this embodiment is composed of the gypsum board as described above.

The decorative layer 6 cures the slurry kneaded material,
It is formed by solidification. Such a kneaded material can be formed by kneading the curable composition and water. The curable composition used for forming the kneaded material is advantageously an inorganic curable composition which is solidified by an appropriate method. Inorganic curable compositions preferably used include those obtained by adding appropriate additives to curable compounds such as calcium hydroxide, calcium sulfate, and magnesium oxide, particularly, plastered slaked lime, plaster, and water such as dolomite plaster. Curable compositions containing calcium oxide as a main component, in particular, those obtained by adding an aqueous emulsion to calcium hydroxide can be used. Further, if necessary, short fibers, inorganic fine aggregates, fine particles, thickeners, fluidizers, defoamers and the like can be added. Plaster is used as the curable composition of the kneaded material in this embodiment.

As the protective sheet 8, a porous sheet having a non-uniform air permeability is preferable, and a preferable example thereof is a fiber sheet made of a synthetic resin such as polypropylene, polyethylene, polyester, etc. Examples thereof include water-resistant paper having unevenness, and a microporous resin sheet in which air permeability unevenness is generated by a method such as heat fusion. As a preferable example of the nonwoven fabric, “Tyvek 1059B” (trade name) manufactured by Asahi DuPont Flashpan Products Co., Ltd. can be mentioned. As a preferred example of the microporous resin sheet, NF sheet: "NF sheet NG" (trade name) manufactured by Tokuyama Corporation can be exemplified.
Note that a microporous resin sheet is used as the protection sheet 8 in this embodiment.

Next, an embodiment of the joint makeup method of the present invention in the case where the interior of a building wall is constructed using a pair of the building boards 2 constructed according to the present invention will be described. Before the pair of building boards 2 are mounted on the base 100 as shown in FIG. 2, the upper edge and the lower edge of the protection sheet 8 disposed on each of the building boards 2 are
It is cut along the upper and lower ends of the corresponding building board 2 and is peeled off from the corresponding surface of the decorative layer 6 and removed. FIGS. 4 and 6 show a state where the lower edge of the protective sheet 8 is cut off and removed from each of the building boards 2 to expose the corresponding surface of the decorative layer 6. The upper edge surface and the lower edge surface of each of the building boards 2 on which the surface of the decorative layer 6 is exposed by peeling off the protective sheet 8 correspond to portions covered by the peripheral edge 106 and the baseboard 104, respectively. . The reason for performing the above-described cutting and peeling work of the protection sheet 8 is that even if an attempt is made to bond the peripheral edge 106 and the baseboard 104 to the building board 2 via the protection sheet 8, the bonding to the protection sheet 8 is impossible. Because it is.

A bond 102 for woodwork is formed on the surface of the substrate 100.
Is applied in a bead shape, and a pair of architectural boards 2 are arranged in parallel on the surface of the base 100 with the side surfaces 3 adjacent to each other. A plurality of screws 108 (see FIGS. 4 and 6) are provided at appropriate intervals along the upper edge and the lower edge of the building board 2 where the surface of the decorative layer 6 is exposed. Type. Thus, the upper edge and the lower edge of each of the building boards 2 are fixed to the corresponding base 100. Reciprocally adjacent receding surfaces 10 of each of the building boards 2
A joint 20 (see FIGS. 2 and 3) forming a V-shaped groove structure is formed between them. Next, each joint 2 of the building board 2
A plurality of temporary nails (not shown) are hammered out at an appropriate interval along the zero. This makes the building board 2
The back surface of each adjacent side edge portion is pressed against the surface of the base 100 via the bond 102. Each temporary nail is driven through a synthetic resin washer member (not shown) dedicated to the temporary nail. In the center of the substantially disk-shaped washer member,
The cylindrical portion is formed so as to protrude in one axial direction of the washer member. The temporary nail is inserted so as to be relatively movable from the protruding end of the cylindrical portion, but is configured so that further relative movement is restricted by contacting the head of the temporary nail with the protruding end of the cylindrical portion. I have. When the false nail is driven, the washer member is positioned so that its flat bottom surface abuts the surface of each adjacent side edge of the building board 2 across the joint 20. As a result, even if there is a slight step between each of the building boards 2, the step is removed or reduced. Each of the temporary nails is also driven into the other side edge of the building board 2 via a washer member. On the back surface of each of the other side edges of the building board 2, a base 100 is of course arranged.

After the pair of building boards 2 are temporarily mounted on the surface of the base 100 as described above, a predetermined time (for example, 5
Wait for more than an hour). After a lapse of a predetermined time, the bond 102 is cured, and each of the building boards 2 is firmly fixed to the surface of the base 100. Bond 1
After 02 has been cured, each of the nails that have been driven in is pulled out. The temporary nail is pulled out by using an appropriate tool such as pliers. Specifically, it is performed by grasping the cylindrical portion of the washer member with pliers and pulling out the temporary nail together.

After all the temporary nails have been pulled out, V-groove-shaped joints 2 formed between the retreating surfaces 10 of the building board 2
0 is filled along with the caulking material 22 (see FIGS. 4 and 5).
reference). As shown in FIG. 4 and FIG.
Is performed by discharging the caulking material 22 from a nozzle 26 provided at the tip of a container 24 containing the caulking material 22. The main body of the container 24 having a tube structure which can be made of a commercially available product is formed of a flexible synthetic resin, and the caulking material 22 is discharged from the tip of the nozzle 26 by pressing the body. can do. In each of the building boards 2, the protection sheet 8 is disposed on the surface of the decorative layer 6 except for the cut and removed upper edge and lower edge. And, as described above, in each of the building boards 2, both side edges in the width direction of the protective sheet 8 are boundaries between the corresponding receding surface 10 and other surfaces of the decorative layer 6 except the receding surface 10. And extends substantially linearly from one end to the other end of the base layer 4. That is,
In each of the building boards 2, the surface of the decorative layer 6, which is the respective surface, is configured such that substantially only each of the receding surfaces 10 is exposed, and the entire other flat surface is covered with the protective sheet 8. Therefore, even if the joints 20 formed between the retreating surfaces 10 are filled with the caulking material 22, a part of the caulking material 22 that has protruded (extruded) from both side edges of the joint 20 is protected by the protective sheet 8. Is received on the surface of the corresponding side edge. Therefore, the caulking material 22 is reliably prevented from adhering to the surface of the decorative layer 6 other than each of the receding surfaces 10 forming the joints 20, that is, the surface of the decorative layer 6 where the adhering of the caulking material 22 is not allowed in appearance. .
In addition, in each partial area | region of each of the upper end edge part and the lower end edge part in which the surface of the decorative layer 6 was exposed,
Even if the caulking material 22 protrudes, there is no problem because these areas are areas finally covered by the peripheral edge 106 and the baseboard 104. As the caulking material 22 suitably used, an elastic resin caulking material such as a water-based acrylic, urethane-based, or silicone-based material can be used.

The caulking material 2 is applied to the joint 20 as described above.
Immediately after filling 2, as shown in FIGS. 6 and 7,
A finishing operation for smoothing the surface with a special spatula 28 is performed. The spatula 28, which may use a configuration known per se, is formed of a scoop-shaped member made of synthetic resin in the illustrated embodiment. In the finishing work on the joint 20, the tip of the spatula 28 is pressed from the surface of the caulking material 22 filled in the joint 20, and the joint 2
Performed by moving along zero. Joint 20
The surface of the caulking material 22 filled into the surface is leveled to a smooth concave surface according to the curved surface of the tip of the spatula 28. In the finishing operation of the joint 20 performed as described above, the amount of the caulking material 22 filled in the joint 20 protruding to both side edges is further increased. The sheet 8 is received on the surface of the corresponding side edge. Caulking material 22 filled in joint 20
After performing the finishing work for smoothing the surface of the building board 2, the peripheral edges of the upper and lower edge surfaces of the building board 2 on which the surface of the decorative layer 6 is exposed as described above are respectively provided. The 106 and the baseboard 104 are attached via an appropriate adhesive. A predetermined time (for example, 2
Leave for 4 hours or more) to cure the caulking material 22 and the adhesive. After the caulking material 22 and the adhesive are cured, each of the protective sheets 8 is peeled off from the surface of the decorative layer 6 of the corresponding building board 2 as shown in FIG. As described above, the makeup of the joint 20 is performed, and the interior work of the wall is completed. 1 and 2 show a state in which the above-described construction has been completed.

In the above embodiment of the joint makeup method of the present invention, the construction board 2 constructed according to the present invention is used.
Is used to construct the interior of the wall of the building, but in this embodiment, it is necessary to form the receding surfaces 10 on both side edges in the width direction of the laminate, that is, each of the building boards 2. However, the present invention can be realized if the receding surface 10 is formed on at least one of the side edges in the width direction (side edges on the side forming the joint 20 adjacent to each other). This is the same in other embodiments of the building board 2 described later. In an embodiment in which three or more building boards 2 are arranged in parallel, joints 20 are provided between both side faces in the width direction of a specific building board 2 and side faces of another building board 2.
Are formed, it is necessary to form the receding surfaces 10 on both side edges in the width direction of the specific building board 2.

In the joint decorative method of the building board 2 according to the present invention, the base layer 4, the decorative layer 6, and the protective sheet 8
A pair of architectural boards 2 each composed of a laminate of the above, wherein the retreat surface 10 is formed on at least one of the widthwise side edges of the laminate, and the protective sheet 8 is substantially
A pair of architectural boards 2 that are arranged to cover the surface of the decorative layer 6 excluding the receding surface 10 and are arranged in parallel on the surface of the base 100 with the side surfaces 3 adjacent to each other. Caulking material 2 is applied to joints 20 formed between
2, the protective sheet 8 is hardened after the caulking material 22 is cured by filling the protective sheet 8 with the corresponding building board 2.
The cosmetic of the joint is achieved by peeling off from the surface of the decorative layer 6 in the above. According to this method, when the joint 20 is filled with the caulking material 22 and when the surface of the caulking material 22 filled in the joint 20 is leveled, a part of the caulking material 22 that protrudes to both side edges of the joint 20 is Since it is received by the side edge surface of the corresponding protective sheet 8,
The joint 20 can be provided with makeup without using a masking tape which has been required conventionally. As a result, it is not necessary to prepare two masking tapes in total, one for each of the pair of building boards 2 as in the related art, so that the cost can be reduced by that much and the parts management for the masking tapes can be reduced. Is also unnecessary. Furthermore, when the joints 20 are applied, it is not necessary to apply a masking tape to each of the adjacent side edge surfaces of each of the building boards 2 and separate them, so that the burden of labor is reduced. The construction time is shortened and the construction cost is reduced. As is apparent from the above description, in the present invention, the protective sheet 8
It has a remarkable feature in that it also has a function as a masking tape conventionally required when performing the makeup of the joint 20.

The architectural board 2 used to carry out the above-described joint dressing method comprises a laminate of a base layer 4, a decorative layer 6, and a protective sheet 8. Receding surfaces 10 are respectively formed on both side edges in the width direction of the laminate, and the protective sheet 8 is disposed so as to cover substantially the entire area of the surface of the decorative layer 6 except for each of the receding surfaces 10. In the embodiment of the building board 2 illustrated in FIG. 3, chamfered surfaces 16 in a form in which a boundary corner between the surface of the base layer 4 and the corresponding side surface 3 are removed are formed on both side edges in the width direction of the base layer 4. ing. The decorative layer 6 is substantially the chamfered surface 1 of the surface of the base layer 4.
6 so as to cover the entire area including each of them. The protective sheet 8 is disposed so as to cover substantially the entire surface of the surface of the decorative layer 6 except for a portion covering each of the chamfered surfaces 16. Each of the receding surfaces 10 is defined by the surface of the decorative layer 6 covering each of the chamfered surfaces 16 of the base layer 4. Since the embodiment of the construction board 2 of the present invention is configured as described above, each side 3 is adjacent to the base 1
The joints 20 forming a V-shaped groove structure between the mutually adjacent receding surfaces 10 in a state of being arranged in parallel on the surface
Is formed. Moreover, both side edges in the width direction of the protection sheet 8 are substantially linear from one end to the other end of the base layer 4 along the boundary between the corresponding receding surface 10 and the other surface of the decorative layer 6 except the receding surface 10. When the joint 20 is filled with the caulking material and the surface is leveled, a part of the caulking material 22 that protrudes to both side edges of the joint 20 is placed on the corresponding protective sheet 8. Is received by the side edge surface of the As a result, it is possible to apply makeup to the joints 20 without using a masking tape that has been required conventionally, so that two masking masks, one for each of the pair of building boards 2 as in the related art, are used. Since it is not necessary to prepare a tape, the cost can be reduced correspondingly, and component management for the masking tape becomes unnecessary. Furthermore, when the joints 20 are applied, it is not necessary to apply a masking tape to each of the adjacent side edge surfaces of each of the building boards 2 and separate them, so that the burden of labor is reduced. The construction time is shortened and the construction cost is reduced. Therefore, by using the above-mentioned building board 2 of the present invention, the above-described joint makeup method of the present invention can be suitably implemented.

FIGS. 9 to 11 show a pair of other embodiments of the construction board 2 of the present invention.
Are shown adjacent to each other in a state in which they are arranged in parallel on the surface of a.
In any of the embodiments of the building board 2 illustrated in FIGS. 9 to 11, similarly to the building board 2 illustrated in FIG. 3, the base layer 4 having a rectangular plate shape, and the decorative layer applied to the surface of the base layer 4. 6
And a protective sheet 8 arranged to cover the surface of the decorative layer 6
A retreating surface 10 is formed at both side edges in the width direction of the laminate, in which a boundary corner between the surface of the laminate and the corresponding side surface 3 is removed.
Are arranged so as to cover substantially the entire area of the surface of the decorative layer 6 except for each of the receding surfaces 10. Each of the building boards 2 in each pair has substantially the same configuration.

In the architectural board 2 shown in FIG. 9, the boundary between the both side edges in the width direction on the surface of the base layer 4 and the corresponding side surface 3 is formed so as to form a boundary corner. The boundary corners are substantially at right angles. The decorative layer 6 is disposed so as to cover substantially the entire surface of the base layer 4. On both side edges in the width direction of the decorative layer 6, chamfered surfaces 16 in a form in which a boundary corner between the surface of the decorative layer 6 and the corresponding side surface of the decorative layer 6 are removed are formed. Each of the chamfered surfaces 16 is formed of a flat inclined surface in the illustrated embodiment, and is formed so as to extend substantially linearly from one end to the other end in the longitudinal direction of the base layer 4. The protective sheet 8 substantially covers the surface of the decorative layer 6,
It is arranged so as to cover all areas other than each of the chamfered surfaces 16. Each of the receding surfaces 10 is a chamfered surface 1 of the decorative layer 6.
6 is defined by each surface. Since the building boards 2 shown in FIG. 9 are configured as described above, they are adjacent to each other in a state in which the side surfaces 3 of the pair of building boards 2 are arranged adjacent to each other in a state of being arranged in parallel on the surface of the base 100. Joints 20 forming a V-shaped groove structure are formed between each of the receding surfaces 10. Moreover, both side edges in the width direction of the protection sheet 8 are substantially linear from one end to the other end of the base layer 4 along the boundary between the corresponding receding surface 10 and the other surface of the decorative layer 6 except the receding surface 10. 3 when used to perform the joint cosmetic method as described above.
It is clear that substantially the same operation and effect as those of the building board 2 shown in FIG.

In the architectural board 2 shown in FIG. 10, chamfered surfaces 16 are formed on both side edges in the width direction of the base layer 4 in a form in which a boundary corner between the surface of the base layer 4 and the corresponding side surface 3 is removed. ing. This configuration is substantially the same as the construction board 2 shown in FIG. However, the decorative layer 6 is provided so as to substantially cover the entire area of the surface of the base layer 4 except for each of the chamfered surfaces 16. The protection sheet 8 is substantially
The decorative layer 6 is provided so as to cover the entire area of the surface. Each of the receding surfaces 10 is defined by a respective surface of the chamfered surface 16 of the base layer 4. Since the architectural boards 2 shown in FIG. 10 are configured as described above, they are adjacent to each other in a state where the side surfaces 3 of the pair of architectural boards 2 are arranged side by side on the surface of the base 100 with the side surfaces 3 adjacent to each other. Joints 20 each having a substantially V-shaped groove structure are formed between each of the receding surfaces 10. In addition, both side edges in the width direction of the protection sheet 8 correspond to the corresponding receding surfaces 10.
Is positioned so as to extend substantially linearly from one end to the other end of the base layer 4 along the boundary between the decorative layer 6 and the other surface excluding the receding surface 10. It is clear that substantially the same operational effects as those of the building board 2 shown in FIG.

Each of the building board 2 shown in FIG. 3, the building board 2 shown in FIG. 9, and the building board 2 shown in FIG. 10 can be integrally and continuously formed by a manufacturing apparatus. . An apparatus for manufacturing such a building board is disclosed in Japanese Patent Application No. 11-107776, filed by Tokuyama Corporation (filing date: April 1999).
On the 15th of the month, the description is omitted in the specification of the title of the invention: apparatus for manufacturing building boards). Due to the fact that the building board 2 of the present invention can be integrally manufactured in advance by a manufacturing apparatus, the retreat surface 10 is formed by cutting before the joint makeup method is performed as in the related art. Eliminating the need for this means that the burden on labor is reduced,
Construction time and construction costs are reduced.

Each of the architectural boards 2 shown in FIG. 11 has a boundary corner between the widthwise side edges on the surface of the laminate composed of the base layer 4, the decorative layer 6 and the protective sheet 8 and the corresponding side surface 3. It is formed in advance to form. One of the boundary corners (both if necessary) is cut by a cutting tool such as a canner (not shown) to be used for performing the above-described joint making method, and the retreat surface 10. Are formed in advance. The receding surface 10 is a flat inclined surface (chamfered surface). In a state where the side surfaces 3 on which the retreating surfaces 10 of the pair of building boards 2 are formed are adjacent to each other and are arranged in parallel on the surface of the base 100, each of the retreating surfaces 10 adjacent to each other A joint 20 having a V-shaped groove structure is formed therebetween. Moreover, one side edge in the width direction of each protective sheet 8 extends substantially linearly from one end to the other end of the base layer 4 along the boundary between the corresponding receding surface 10 and the surface of the decorative layer 6. Since it is positioned, it is clear that, when used in the execution of the joint filling method as described above, the same operation and effect can be achieved except for a part of the building board 2 shown in FIG. Description is omitted. The difference in the function and effect is that since the retreat surface 10 is formed by cutting in the building board 2 shown in FIG. 11, the burden of labor, the construction time and the construction cost are increased accordingly. However, it is exactly the same as the building board 2 shown in FIG. 3 in that there is no need to use a masking tape, and in that respect, it is apparent that a superior effect can be achieved as compared with the related art.

Next, a preferred embodiment of a method for making a corner of a building board according to the present invention and a building board for carrying out the method will be described. FIG. 12 shows the corners of the interior of a building, which are constructed by performing one embodiment of the corner making method according to the present invention using one embodiment of the building board 2 according to the present invention. Have been. FIG.
In the embodiment of the present invention shown in FIG. 3, a pair of architectural boards 2 having substantially the same configuration as the architectural board 2 shown in FIG. 3 is used. For convenience of explanation, one of the building boards 2 is denoted by a symbol a, and the other building board 2 is denoted by a symbol b. The base 100
The same applies to

At the corner of the building, two foundations 100a and 100b are arranged such that their surfaces are at right angles to each other. Before each of the building boards 2a and 2b is placed on the surface of the bases 100a and 100b as described below, the upper edge and the lower edge of each protective sheet 8 are cut in the same manner as in the previous embodiment. And peeled off. One side edge in the width direction of one architectural board 2a has a back surface on which the decorative layer 6 is not present disposed on the surface of one base 100a and is fixed by a bond 102 in the same manner as in the previous embodiment. The surface (one side surface) 3 is positioned so as to substantially contact the surface of the other base 100b. The upper edge and the lower edge of the building board 2a have a plurality of screws 108.
Are fixed to the base 100a and other bases 100a (not shown) arranged at intervals on the side of the base 100a. One side edge in the width direction of the protection sheet 8 of the building board 2a (one side edge corresponding to the one side edge in the width direction of the building board 2a) is peeled from the corresponding surface of the decorative layer 6. The surface of the decorative layer 6 is exposed. In addition, one edge in the width direction of the other building board 2b has its front end face (one side face) 3 abutted against (butted against) the exposed surface of the decorative layer 6 of the one building board 2a. ) State, is disposed on the surface of the base 100b, and is fixed by the bond 102 as in the previous embodiment. Architectural board 2b
Are fixed to a base 100b and a plurality of bases 100b (not shown) spaced apart from each other by a plurality of screws 108. As in the previous embodiment, a plurality of temporary nails (not shown) are driven into the one side edge and the other side edge of the building board 2a via a washer member, and are pulled out after a predetermined time elapses. As described above, the construction boards 2a and 2b
As a result, the interior corners 30 of the interior which are substantially perpendicular to each other are formed.

Next, a description will be given of an embodiment of a method for dressing a corner formed by the building boards 2a and 2b. First, a masking tape 32 in the form of a band along the corner 30 is attached to the exposed surface of the decorative layer 6 at the one side edge of the one architectural board 2a. next,
In the same manner as in the previous embodiment, the caulking material 2 is placed in the corner 30 using the container 24 (see FIGS. 4 and 5).
Fill 2 Caulking material 22 protruding from entry corner 30
Is received on the surface of the masking tape 32, and the other is received on the surface of the side edge of the protective sheet 8 in the building board 2b. Therefore, the decorative layer 6 that forms the corner 30 and the decorative layer 6 other than the receding surface 10
The caulking material 22 is reliably prevented from adhering to other surfaces, that is, the surface of the decorative layer 6 where the appearance of the caulking material 22 is not allowed. In addition, even if the caulking material 22 protrudes in each of the upper edge and the lower edge of the building board 2 where the surface of the decorative layer 6 is exposed, these areas are formed by the peripheral edge 106 and the width. There is no problem because it is the area finally covered by the tree 104.

As described above, the caulking material 2
Immediately after filling 2, a finishing operation is performed in a manner substantially similar to that in the previous embodiment, in which the surface is smoothed by a special spatula of another form (not shown). After performing a finishing operation to smooth the surface of the caulking material 22 filled in the corner 30, the surfaces of the upper end edges of the building boards 2a and 2b on which the surface of the decorative layer 6 is exposed as described above. And a peripheral edge 106 on the lower edge surface, respectively.
And the baseboard 104 is attached via an appropriate adhesive. In this state, the caulking material 22 and the adhesive are hardened by being left for a predetermined time (for example, 24 hours or more).
After the caulking material 22 and the adhesive are cured, the masking tape 32 and the protective sheet 8 are peeled off from the surfaces of the decorative layers 6 of the building boards 2a and 2b. The makeup of the corner 30 is performed as described above, and the interior work at the corner of the wall is completed.

In the method for making a corner of a building board 2 according to the present invention, the base layer 4, the decorative layer 6, and the protective sheet 8 are provided.
And a pair of architectural boards 2a and 2b, each of which is formed from a laminate of the above, and one side edge in the width direction of the protective sheet 8 of one architectural board 2a disposed on the surface of the base 100a is a decorative layer 6 Is peeled off from the corresponding surface of the laminate, the surface is exposed, and the other architectural board 2b has a receding surface 10 formed on one side edge in the width direction of the laminated body, and the protective sheet 10 substantially has the receding surface 10 The side surface 3 on the side on which the receding surface 10 is formed is provided so as to cover the surface of the decorative layer 6 excluding the surface of the decorative layer 6, and is brought into contact with the exposed surface of the decorative layer 6 in one of the building boards 2a. One of the pair of architectural boards 2a and 2b in which the corners 30 are formed by being disposed on the surface of the base 100b in the state,
a, a masking tape 32 is adhered to the exposed surface of the decorative layer 6 along the corner 30 and then the caulking material 22 is filled into the corner 30 to level the surface.
After curing, the masking tape 32 and the protective sheet 8 are peeled off from the surface of the decorative layer 6 on the building boards 2a and 2b to complete the makeup of the corner 30.

As described above, the corner 30 is formed on the exposed surface of the decorative layer 6 at one side edge of the building board 2a while the side 3 of the other building board 2b is in contact therewith. However, since the receding surface 10 formed of an inclined surface is formed at the side edge of the building board 2b, the above-mentioned surface (flat surface) of the decorative layer 6 of the building board 2a and the receding of the building board 2b. The corner (joint) 30 formed between the surface 10 and the surface 10 has a groove structure having an acute angle in cross section. As a result, the caulking material 2 is compared with the conventional corner structure having no groove.
2 can be sufficiently filled, so that the building board 2
The generation of a gap in the corner 30 due to the aging of one and / or the other of a and 2b is reliably prevented. As a result, it is possible to ensure the appearance of the inset corner 30 at the beginning when the makeup is applied stably over a longer period than before. The other architectural board 2b has a receding surface 10 formed on one side edge in the width direction of the laminate, and the protective sheet 10 is disposed so as to substantially cover the surface of the decorative layer 6 excluding the receding surface 10. Since the side surface 3 on which the receding surface 10 is formed is arranged on the surface of the base 100b in a state in which the side surface 3 is in contact with the exposed surface of the decorative layer 6 of the one architectural board 2a, the masking tape is used. 32 only needs to be prepared for one building board 2a. As a result, the cost increase is reduced by half and the parts management becomes easier than before. Also, the work of attaching and detaching the masking tape does not have to be performed on the building boards 2a and 2b as in the related art, but only needs to be performed on one of the building boards 2a. The labor burden is reduced, the construction time is shortened, and the construction cost is also reduced.

The other architectural board 2b used for carrying out the above-described in-corner makeup method has a receding surface 1 on its side edge.
0 is formed. Therefore, one building board 2
The corner 30 formed by abutting the side surface 3 of the other building board 2b on the exposed surface of the decorative layer 6 at one side edge of the a has a groove structure having a cross section of an acute angle as described above. Make As a result, the caulking material 22 can be sufficiently filled as compared with the conventional corner structure having no groove, so that the appearance of the corner 30 at the beginning when the makeup is applied is more stable for a longer time than before. And secure it. In addition, one side surface 3 is brought into contact with the exposed surface of the decorative layer 6 on one of the building boards 2a.
The other architectural board 2b has a receding surface 10 formed on one side edge in the width direction of the laminated body (one side edge on the one side surface 3 side), and the protective sheet 10 is substantially a decorative layer excluding the receding surface 10. 6
Since the masking tape 32 is provided so as to cover the surface of the building board 2a, only one piece of the masking tape 32 is prepared for one of the building boards 2a, so that the caulking material 22 filled in the corner 30 is sufficiently secured. Can respond to. As a result, the cost increase is halved compared to the past,
Also, parts management is easier than before. In addition, since the work of attaching and removing the masking tape does not have to be performed on the building boards 2a and 2b as in the related art, it is sufficient to perform the operation on only one of the building boards 2a.
Compared with the related art, the burden of labor is reduced, the construction time is shortened, and the construction cost is also reduced. In the embodiment shown in FIG. 12, the building board 2b is constituted by the building board 2 shown in FIG. 3, but is established by using any of the building boards 2 shown in FIGS. In the embodiment in which the receding surfaces 10 are formed on both side edges in the width direction of the building board 2b, if it is necessary to adjust the length in the width direction, the building board 2b is placed at a required position in the width direction. Used by cutting in the longitudinal direction. In this case, the receding surface 10 is formed by cutting at a side edge of the building board 2b on the cut end surface side. This end face has a shape substantially as shown in FIG. Further, in the embodiment shown in FIG. 12, the retreat surface 10 is formed on one side edge of the one architectural board 2 a in the width direction and on one side edge on the corner side as shown in the drawing. , And even if they are not formed, they all hold. As is clear from the above description, also in the present invention, the protective sheet 8 is provided with the joints 20.
The present invention has one remarkable feature in that it also has a function as a masking tape that has been conventionally required in performing the makeup.

The practical dimensions of the building board 2 are generally as follows. That is, the base layer 2
Has a width of 910 mm or 1,000 mm and a height of 1,82
0mm to 2,730mm, thickness is 9.5mm or 12.
5 mm; the thickness of the decorative layer is 0.4 mm to 20.0 mm; and the thickness of the protective sheet 32 is 0.05 mm to 0.1 mm.

As described above, the present invention has been described in detail based on the embodiments with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and does not depart from the scope of the present invention. Various other variations or modifications are possible. For example, in the above-described embodiment, the shape of the receding surface 10 is formed as a flat inclined surface whose cross section extends substantially linearly. However, in some embodiments, the cross section is formed to have a concave curved surface or a convex curved surface. Embodiments in which the cross section has an L shape are also conceivable.

[0044]

According to the joint making method of the present invention using the architectural board of the present invention, it is possible to perform joint making without using a masking tape which has been required conventionally. In addition, if the joint making method and the corner making method of the present invention are realized by using the building board of the present invention, the burden of labor can be reduced, the construction time can be reduced, and the construction cost can be reduced as compared with the related art. Enable. Also, if the method for making a corner of the present invention is realized by using the architectural board of the present invention, it becomes possible to sufficiently fill the caulking material, and as a result, the appearance at the time of applying the makeup to the corner of the corner is improved. For a longer period of time than before.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of the interior of a building constructed by performing one embodiment of a joint dressing method according to the present invention using one embodiment of a building board according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a perspective view showing one embodiment of a building board according to the present invention, with a part thereof being omitted.

FIG. 4 is a schematic perspective view showing a state of one operation step in the execution of the joint makeup method according to the present invention.

FIG. 5 is a sectional view taken along the line BB of FIG. 4;

FIG. 6 is a schematic perspective view showing the state of another working step in the execution of the joint makeup method according to the present invention.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

FIG. 8 is a schematic perspective view showing a state of still another working step in the execution of the joint makeup method according to the present invention.

FIG. 9 is a cross-sectional view showing a part of a state in which another embodiment of the building board according to the present invention is arranged on a base.

FIG. 10 is a cross-sectional view showing a part of a state in which still another embodiment of the building board according to the present invention is arranged on a base.

FIG. 11 is a cross-sectional view showing a main part of a building board according to still another embodiment of the present invention arranged on a base.

FIG. 12 shows a part of an interior corner of a building, which is constructed by performing an embodiment of an interior corner makeup method according to the present invention using one embodiment of a building board according to the present invention. FIG. 2 is a schematic perspective view showing a cutaway perspective view of a state immediately before performing makeup at a corner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Architectural board 3 Side surface 4 Base layer 6 Decorative layer 8 Protective sheet 10 Retreating surface 16 Chamfered surface 20 Joint 22 Caulking material 30 Corner 32 Masking tape 100 Base

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2E001 DA01 DB02 EA09 FA03 FA10 FA52 FA64 FA73 GA12 GA42 HA01 HA03 HA21 HA31 HB02 HC01 HC07 HC08 HD03 HF02 JA01 JA02 JA04 JA06 JA22 JA24 KA01 LA04 LA12 MA02 MA06 NA07 2E110 AA09 AA57 AA42A AB04 AB23 AB28 BA04 BA12 BD26 CA07 CB02 CC04 DA03 DA12 DC15 DC21 DC22 DC36 DD03 GA14Z GA24Z GA32Z GA33W GA33Z GA36X GA42W GA42Z GA43W GB02Z GB11W GB15W GB16Z GB17Z GB19Z GB23Z GB24Z GB43Z GB44Z GB53Z GB54GB62GB

Claims (6)

[Claims] 1. A pair of buildings each composed of a laminate of a rectangular plate-shaped base layer, a decorative layer applied to the surface of the base layer, and a protective sheet disposed to cover the surface of the decorative layer. A retreating surface in which at least one of the side edges in the width direction of the laminated body is formed with a boundary corner between the surface of the laminated body and a corresponding side face removed, and the protective sheet is substantially formed. A pair of building boards arranged so as to cover the surface of the decorative layer excluding the receding surface and arranged in parallel on the surface of the base with the side surfaces adjacent to each other, between each of the mutually adjacent receding surfaces. After filling the caulking material into the joint formed on the surface to level the surface, and curing the caulking material, each of the protective sheets is peeled off from the surface of the decorative layer on the corresponding building board to form a joint. Perform makeup,
A joint makeup method for a building board. 2. A pair of buildings each comprising a laminate of a rectangular plate-shaped base layer, a decorative layer applied to the surface of the base layer, and a protective sheet disposed to cover the surface of the decorative layer. For a board, one side edge in the width direction of the protective sheet of one of the architectural boards disposed on the surface of the foundation is peeled from the corresponding surface of the decorative layer, the surface is exposed, On the other hand, the architectural board has a receding surface on one side edge in the width direction of the laminate in which a boundary corner between a surface of the laminate and a corresponding side surface is removed, and the protection sheet is substantially formed. The side surface on which the retreat surface is formed is disposed so as to cover the surface of the decorative layer except the retreat surface, and the side surface on which the retreat surface is formed abuts on the exposed surface of the decorative layer in one of the building boards. A pair of corners formed by being placed on the surface of the base After applying a masking tape to the exposed surface of the decorative layer on one of the architectural boards of the architectural board along the corner, the corner is filled with a caulking material to level the surface. Performing the makeup of the corner by peeling off each of the masking tape and the protective sheet from the surface of the decorative layer in the corresponding building board after curing the caulking material. How to make corners for building boards. 3. A laminate comprising a rectangular plate-shaped base layer, a decorative layer provided on the surface of the base layer, and a protective sheet disposed to cover the surface of the decorative layer. On both side edges in the width direction, receding surfaces formed by removing a boundary corner between the surface of the laminate and the corresponding side surface are formed, and the protective sheet is substantially the decorative layer except for each of the receding surfaces. An architectural board arranged to cover the entire area of the surface of the building. 4. A chamfered surface having a form in which a boundary corner between a surface of the base layer and a corresponding side surface is removed is formed at both side edges in a width direction of the base layer, and the decorative layer is substantially formed of the base layer. The protective sheet is applied so as to cover the entire area of the surface of the decorative layer including each of the chamfered surfaces, and the protective sheet covers the entire other area of the surface of the decorative layer except for the portion substantially covering each of the chamfered surfaces. 4. The architectural board of claim 3, wherein each of said recessed surfaces is disposed and is defined by a surface of a decorative layer covering each of said chamfered surfaces of said base layer. 5. The base layer is formed so as to form a boundary corner between both side edges in the width direction and the corresponding side surface on the surface of the base layer, and the decorative layer is disposed so as to cover substantially the entire surface of the base layer; On both side edges in the width direction of the decorative layer, chamfered surfaces in a form in which a boundary corner between the surface of the decorative layer and the corresponding side surface of the decorative layer are removed are formed, and the protective sheet is formed of the decorative layer. 4. The surface of claim 3, wherein said surface is disposed so as to cover substantially all of said surface except for each of said chamfered surfaces, each of said recessed surfaces being defined by a respective surface of said chamfered surface of said decorative layer. Architectural board. 6. A chamfered surface in which a boundary between a surface of the base layer and a corresponding side surface is removed is formed at both side edges in a width direction of the base layer, and the decorative layer is formed on a surface of the base layer. Wherein the protective sheet is disposed to cover substantially the entire area except for each of the chamfered surfaces, and the protective sheet is disposed so as to cover substantially the entire area of the surface of the decorative layer; The architectural board of claim 3, defined by a surface of each of the chamfers.