JP2012107470A - Building plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building plate having an indistinctive abutting part, so as to form a wall with good appearance.SOLUTION: A building plate A has a plurality of block patterned protrusions 1 with an approximately equal vertical width which are continuously arranged in lateral direction for construction. At least one side end 4 of the building plate A is provided with a side-end groove part 2 to form a longitudinal joint 6 when constructed. A part of the block patterned protrusion 1 to be located adjacent to the side-end groove part 2 when constructed is provided with a collapse part 3 at the end surface adjacent to the side-end groove part 2. An arrangement is made such that the collapse parts 3 are not adjoined in lateral direction when constructed.

Description

  The present invention relates to a building plate used as a wall material.

  2. Description of the Related Art Conventionally, a building plate having a plurality of block-shaped convex portions provided on the surface is known (for example, Patent Document 1). Such building plate materials are end-faced by construction, and a block-like pattern is formed on the wall surface.

JP 2004-332226 A

  In a building board provided with such block-shaped convex portions, grooves for forming vertical joints are often formed at both end portions. And when constructed, the side edge of the building board and the side edge of the other building board adjacent to this building board are abutted, and the grooves on both side edges are united. Become a vertical joint.

  However, the vertical joint formed by abutting the side end portions is conspicuous, so that there is a problem that the butted portion of the building board material is easily visually recognized and the sense of unity of the block-like pattern is impaired.

  This invention is made | formed in view of said problem, and makes it a subject to provide the board | plate material for construction which forms the wall surface with a favorable external appearance that the butt | matching location of a board | plate material for construction is not conspicuous.

  The building board material according to the present invention has a plurality of block-shaped convex portions that are arranged so as to be continuous in the horizontal direction when constructed, and has been constructed at least on one side end portion. A plate material for a building having a side end groove portion that forms a vertical joint at the time of construction, and a part of the block-like convex portion adjacent to the side end groove portion when constructed is a surface of the end portion on the side end groove portion side. A collapsed part is formed, and the collapsed part is a building plate material arranged so as not to be adjacent in the lateral direction when constructed.

  And the said collapsing part may be formed every other block-shaped convex part arrange | positioned in the vertical direction.

  Further, a part of the block-shaped convex part adjacent to the vertical joint formed in the center is formed with a vertical joint collapse part in which the surface of the end part on the vertical joint side is collapsed, and the vertical joint collapse part is in the lateral direction. May be formed so as not to be adjacent to each other.

  ADVANTAGE OF THE INVENTION According to this invention, the wall surface of the external appearance which gives the impression that the butt | matching location of the board | plate material for construction is not conspicuous, and a block tone pattern continued can be formed.

(A) is a top view which shows an example of embodiment of the board | plate material for construction, (b) is an end view of the (i)-(i) cross section of (a), (c) is (a). It is an end elevation of the section (ii)-(ii). (A) is schematic which shows an example of a mode that the board | plate material for construction is constructed, (b) is a front view which shows an example of the wall formed with the board | plate material for construction. (A) is a top view which shows another example of embodiment of the board | plate material for construction, (b) is an end view of the (i)-(i) cross section of (a), (c) is ( It is the end view of the (ii)-(ii) cross section of a), (d) is the end view of the (iii)-(iii) cross section of (a). (A) is the schematic which shows an example of a mode that construction board | plate material is constructed, (b) is a front view which shows an example of the wall formed with the board | plate material for construction. (A) is a top view which shows another example of embodiment of the board | plate material for construction, (b) is an end view of the (i)-(i) cross section of (a), (c) is ( It is the end view of the (ii)-(ii) cross section of a), (d) is the end view of the (iii)-(iii) cross section of (a). It is a front view which shows an example of the wall formed with the board | plate material for construction.

  Drawing 1 shows an example of an embodiment of board material A for construction of the present invention. This building board material A is used as an outer wall material. The building plate A is formed in a rectangular shape, and may be vertically long, horizontally long, or square. For example, the horizontal length can be set to 303 to 3030 mm, and the vertical length can be set to 100 to 3030 mm. Moreover, although the board | plate material A for construction is laid down and attached to the surface of a wall base in the case of construction, the attachment method may be vertically stretched or horizontally stretched. The building board A is formed using an appropriate material, and is formed of, for example, a cement board, a concrete board, a wood board, or the like.

  On the surface of the building plate A, a plurality of block-like convex portions 1 are provided integrally with the surface. The block-shaped convex portion 1 is formed so as to protrude in a horizontally long rectangular shape on the surface of the plate material, and the vertical width thereof is formed substantially equal. In the form of FIG. 1, the lateral width is also formed equal, but the lateral width may not be equal. Moreover, the block-shaped convex part 1 is arrange | positioned along with the linear form in the horizontal direction. In the form of FIG. 1, the block-shaped convex portions 1 are arranged in a straight line in the vertical direction. Therefore, the block-shaped convex portions 1 are arranged in a grid pattern as a whole. In addition, arrangement | positioning of the block-shaped convex part 1 is. For example, the upper block-shaped convex portions 1 are arranged straddling two of the lower block-shaped convex portions 1, and are arranged in a staggered manner in the vertical direction. It may be something like this.

  The surface of the block-shaped convex part 1 may be flat, and the uneven | corrugated pattern may be formed. Moreover, the pattern that a part of block-shaped convex part 1 collapse | crumbles a little may be sufficient. As a result, it is possible to form a pattern that is a stack of slightly broken stones, and it is possible to express a sense of luxury and softness. Although the dimension of the block-shaped convex part 1 is not restrict | limited in particular, For example, a protrusion width (thickness) shall be about 1.0-10 mm, a horizontal width shall be about 10-1000 mm, and a vertical width shall be about 6-300 mm. be able to.

  The protruding peripheral edge of each block-shaped convex portion 1 is a chamfered slope or curved surface, and as shown in FIGS. 1B and 1C, the cross-sectional shape is a straight line or a rounded arc. ing. By chamfering, the shape can be made closer to a stone, and a pattern like a pile of stones can be expressed.

  A plurality of vertical joints 6 are formed between the block-shaped convex portions 1, 1 arranged side by side by grooves formed by protruding the block-shaped convex portions 1. In addition, a plurality of horizontal joints 7 are formed between the block-like convex portions 1 and 1 arranged in the vertical direction by grooves formed by the protruding block-like convex portions 1. The vertical joints 6 and the horizontal joints 7 provided in advance on the plate material are provided by imitating the joints of the walls formed by stacking actual blocks, and serve as pseudo joints.

  Moreover, the vertical joint 6 and the horizontal joint 7 can form the small-sized building board A as a cut product by cutting in this part. Among these, it is preferable that the vertical joint 6 is formed in the position of about half of the width of the building board material A. In that case, the building plate A can be cut at the vertical joint 6 and used as a 1/2 size product, and the convenience of the building plate A can be enhanced. In the form of FIG. 1, the vertical joints 6 are formed at the positions of 1/4, 1/2, 3/4 of the horizontal width, and specifications that can obtain 1/4 size products or 3/4 size products are also available. It has become.

  The color and pattern of the building board material A are not particularly limited. For example, if the joints (vertical joints 6 and horizontal joints 7) are black or dark gray and the block-shaped convex part 1 is light gray, the stone tone The block pattern can be formed. Moreover, if the block-shaped convex part 1 is made into a reddish brown color, a brick-like block pattern can be formed.

  A side end groove portion 2 is provided on the side end portion 4 of the building plate A as a groove formed by protruding the block-shaped convex portion 1 on the side end portion 4 side. In the form of FIG. 1, the side end groove portion 2 is formed in both side end portions 4 and 4 in the longitudinal direction, but the side end groove portion 2 may be formed only in one of the side end portions 4. Good. The lateral width of the side end groove portion 2 is such that the sum of the side end groove portion 2 of the one side end portion 4 and the side end groove portion 2 of the other side end portion 4 is formed substantially equal to the lateral width of the vertical joint 6. preferable. Thereby, the horizontal width of the vertical joint 6 formed by the butting of the side end portions 4 is the same width dimension as the vertical joint 6 provided in advance on the plate material, and a natural appearance is given to the wall surface that becomes a block-like pattern. Can do. For example, the lateral width of each side end groove 2, 2 can be approximately half the width of the vertical joint 6, but is not limited to this, even if the lateral width of each side end groove 2, 2 is different, Further, the side end groove portion 2 having substantially the same width as the vertical joint 6 may be formed only in one of the side end portions 4.

  Moreover, in the form of FIG. 1, also in the upper end part and lower end part of the board | plate material A for construction, the upper end groove part 5 and the lower end groove part 8 are formed as a groove | channel formed when the block-shaped convex part 1 protrudes. At the time of construction, when the construction material A is disposed in the vertical direction, a horizontal joint 7 is formed by the upper end groove portion 5 and the lower end groove portion 8. The vertical width of the upper end groove 5 and the lower end groove 8 can be, for example, approximately half the vertical width of the vertical joint 7.

  And the block-shaped convex part 1 is arrange | positioned so that a block-like pattern may continue linearly in the horizontal direction, when it constructs. That is, the block-shaped convex portions 1 forming the horizontal rows are aligned on the vertical direction across the plurality of building board materials A, so that a linear pattern extending in the horizontal direction is formed on the wall surface. It is.

  Fig.2 (a) has shown the mode at the time of facing and attaching the board | plate material A for construction of FIG. Moreover, FIG.2 (b) has shown the wall surface which the board | plate material A for construction of FIG. 1 was attached. As shown in FIG. 2B, in the adjacent building plate A, the block-shaped convex portions 1 facing each other with the side end groove portions 4 therebetween have the same vertical position. Thus, when the vertical positions of the block-shaped convex portions 1 are aligned, a continuous block-like pattern with a sense of unity can be formed on the wall surface.

  And in this embodiment, when it constructs, the collapsing part 3 which the surface of the edge part by the side end groove part 2 side collapsed is formed in a part of block-shaped convex part 1 adjacent to the side end groove part 2. Yes. In other words, in the block-shaped convex portion 1 arranged on the side end portion 4 side among the plurality of block-shaped convex portions 1 provided on the building plate A, a collapsed portion 3 is formed in a part thereof. In the form of FIG. 1, the collapsing part 3 is provided in a part of the block-shaped convex part 1 adjacent to the side end groove part 2 provided in the both side edge parts 4 and 4 of the board | plate material A for construction, and the surface and end surface It is formed as a beveled slope. This inclined surface may be a flat surface as shown in the figure, or may be a curved surface. Moreover, the collapsing part 3 may not be a slope, for example, may be stepped. In addition, when the side end groove part 2 is formed only in any one side edge part 4, you may form the collapse part 3 in the block-shaped convex part 1 adjacent to the side end groove part 2, or a side end groove part The collapsed portion 3 may be formed on the block-shaped convex portion 1 of the side end portion 4 on the side where 2 is not formed, or collapsed on both the side where the side end groove portion 2 is formed and the side where it is not formed. The part 3 may be formed.

  The collapsed part 3 is formed over the longitudinal direction of the block-like convex part 1. As shown in FIG. 1B, the depth dimension L1 of the collapsing part 3 is, for example, about 1/5 to 4/5, preferably about 1/3 to 2/3 of the projecting dimension of the block-like convex part 1. Can be. Specifically, the depth dimension L <b> 1 of the collapsed part 3 may be approximately half of the projecting dimension of the block-shaped convex part 1. The lateral dimension L2 of the collapsing part 3 can be set to about 1/10 to 1/2 of the lateral width of the block-shaped convex part 1, for example. Specifically, the lateral width L2 of the collapsed portion 3 may be set to approximately 1/3 of the lateral width of the block-shaped convex portion 1. When the collapsing portion 3 is formed with an inclined surface, the inclination angle θ with respect to the surface of the plate material may be set to 15 to 60 degrees, or 30 to 45 degrees. Thus, by setting the dimensions of the collapsing portion 3, the appearance of the butted portion can be made better. If the dimension of the collapsed portion 3 becomes too large, the appearance may be changed and damaged.

  The collapsed portion 3 is formed so as not to be arranged adjacent to each other in the horizontal direction when it is constructed. That is, the row of the block-shaped convex portions 1 arranged in the horizontal direction (hereinafter referred to as a row) is formed by at least the following two types of rows. The first row is, for example, 1, 3, 5 rows from the top of FIG. 1A, and the collapsed portion 3 is formed on one side end portion 4 side (left side of FIG. 1A). It is a row of the block-shaped convex part 1 in which the collapsing part 3 is not formed in the other side edge part 4 side (right side of Fig.1 (a)). The second rows are, for example, 2, 4, and 6 rows from the top in FIG. 1A, and the side end portion 4 side where the collapsed portion 3 is formed in the first row (left side of FIG. 1A). In the first row, the block-shaped convexity in which the collapsed portion 3 is formed on the side end 4 side (the right side in FIG. 1A) where the collapsed portion 3 is not formed in the first row. Part 1 is a row. In this way, by forming the collapsed portion 3 at one of the side end portions 4, it is possible to prevent the collapsed portions 3 from being arranged side by side when construction is performed. In one row of the block-shaped convex portions 1, if the collapsed portions 3 are formed at both side end portions 4, 4, the collapsed portions 3 are disposed adjacent to each other at the time of construction. In one row of the block-shaped convex portion 1, the collapsed portions 3 may not be formed on both the side end portions 4 and 4, but in order to improve the appearance of the butted portion, It is preferable that the collapsed portion 3 is formed on either one.

  In the form of FIG. 1, the collapsed portions 3 are formed every other block-shaped convex portion 1 arranged in the vertical direction. That is, as described above, the first rows and the second rows in which the collapsed portions 3 are formed on the opposite sides of the side end portions 4 are alternately arranged in the vertical direction. When arranged in this way, the collapsed portions 3 are not continuously arranged in the vertical direction, and a more natural appearance can be given.

  Then, as shown in FIG. 2B, when the wall surface is formed by abutting the building plate A, the collapsing portion 3 is formed vertically with the vertical joint 6 formed by the side end groove portions 2 and 2 interposed therebetween. It is arranged in a staggered pattern in the direction. As described above, the collapsing portion 3 is formed adjacent to the abutting portion, so that the abutting portion becomes difficult to understand and the appearance can be improved. Moreover, when the collapsing portions 3 are arranged in a zigzag pattern, an appearance having a block-like pattern is provided.

  By the way, as shown in FIG. 2A, when the building plate A is abutted and attached to the wall base, the vertical position of the building plate A and the vertical position of each block-shaped convex portion 1 are attached together. However, in the left and right building plate materials A and A, a slight shift may occur in the vertical direction, or one building plate material A may be inclined with respect to the other building plate material A. In some cases, the left and right building plates A, A are spread out from each other in the horizontal direction, and the vertical joints 6 formed by the side end groove portions 2 are formed wider than the vertical joints 6 provided in advance. Further, depending on the degree of attachment to the wall base, there may be a slight shift in the front-rear direction (thickness direction) of the wall surface in the left and right building plates A, A. In this way, when there is a shift in the building plate A, the vertical joint formed by the side end groove portion 2 is a plate material in which only the block-shaped convex portion 1 that protrudes in a simple rectangular shape without the collapsing portion 3 is formed. In the block-shaped convex portion 1 facing each other with the 6 in between, the vertical position and the front-rear position of the end edges on the side end portion 4 side are different, and the abutting portion may be conspicuous due to light reflection (shine) or the like. .

  However, in the present invention, the collapsed portion 3 is formed on one side of the block-shaped convex portion 1 that sandwiches the vertical joint 6 formed by butting the side end portions 4, so that the block-shaped convex portions 1 that are adjacent to each other at the butted portion. This makes it difficult to understand the positional deviation of the edges of the light, and can suppress the sense of incongruity of the light shine and make the butt portion inconspicuous. Moreover, since the block-shaped convex portions 1 on which the collapsed portions 3 are formed are not arranged adjacent to each other, there is no occurrence of a new misalignment or the like that may occur when the collapsed portions 3 are adjacent to each other. An unnatural appearance such as discontinuity is not given, and the butted portion can be made inconspicuous while maintaining a natural appearance.

  FIG. 3 is another example of the embodiment of the building board material A of the present invention. The description of the same parts as those in FIG. 1 is omitted.

  In this embodiment, the block-shaped convex part 1 is comprised by the block-shaped convex part 1 (long block-shaped convex part 1a) with a long lateral width, and the block-shaped convex part 1 (short block-shaped convex part 1b) with a short lateral width. ing. The vertical block-shaped convex portions 1a and the horizontal block-shaped convex portions 1b are formed with substantially the same vertical width. A plurality of (two in the figure) horizontal block-shaped convex portions 1b are arranged in the horizontal direction so as to be substantially equal to the horizontal width of the long block-shaped convex portions 1a. A block dividing groove 10 extending in the vertical direction is provided between the adjacent horizontal block-shaped convex portions 1 b and 1 b at the same depth as the vertical joint 6 and the horizontal joint 7. That is, the short block-shaped convex portion 1 b is formed by dividing a part of the long block-shaped convex portions 1 a arranged vertically and horizontally into a plurality of blocks by the block dividing grooves 10. Further, it may be said that one section of the long block-shaped convex portion 1a is replaced with a plurality of short block-shaped convex portions 1b. The horizontal width of the block dividing groove 10 is preferably formed with a width substantially equal to that of the vertical joint 6.

  In the section in which the long block-shaped convex portion 1a is replaced with a plurality of short block-shaped convex portions 1b, the other block-shaped convex portions 1 in which the edges of the short block-shaped convex portions 1b arranged at the side ends are arranged in the vertical direction. It is arrange | positioned so that the edge of this and the position of a horizontal direction may align. Thereby, the horizontal width of the vertical joint 6 is constant over the vertical direction, and a stable impression can be given to the block-like pattern as a whole.

  The lateral width of the short block-shaped convex portion 1b may be substantially half of that of the long block-shaped convex portion 1a, but can be, for example, about 1/10 to 4/5 of the long block-shaped convex portion 1a. If the width of the short block-shaped convex portion 1b is too short, the appearance of the block-like pattern may be impaired.

  The positions at which the short block-shaped convex portions 1b are formed (sections in which the long block-shaped convex portions 1a are replaced with a plurality of short block-shaped convex portions 1b) may be set randomly, but may be regular. . However, if there are too many continuous short block-shaped convex portions 1b arranged in the vertical direction, the appearance of the block-like pattern may be impaired. Therefore, when the short block-shaped convex portions 1b are arranged in the vertical direction, the number is 5 or less. It is preferable. The number of sections in which the short block-shaped protrusions 1b are formed (the number of sections in which the long block-shaped protrusions 1a are replaced with a plurality of short block-shaped protrusions 1b) is the entire block-shaped protrusions 1a. In this case, the number is preferably about 1/10 to 1/2 of the long block-shaped convex portion 1a. If the number of short block-shaped convex portions 1b is too large, the appearance of the block-like pattern may be impaired.

  As shown in FIGS. 4A and 4B, the block-shaped convex portion 1 is configured by the block-shaped convex portions 1 having different widths such as the long block-shaped convex portion 1a and the short block-shaped convex portion 1b. In addition, the butt portion can be made more inconspicuous when constructed. That is, by inserting the short block-shaped convex portions 1b in places so as to be vertically allocated, it is possible to weaken the horizontal joint 7 and the shading that passes through the horizontal direction formed by the horizontal alignment of the block-shaped convex portions 1. It is possible to relieve the uncomfortable feeling of the vertical joint 6 between the building plate materials A. Moreover, it becomes possible to express the appearance of a gentle image by arranging the short block-shaped convex portions 1b at random.

  In this embodiment, the collapsing part 3 is formed by a plurality of inclined surfaces having different inclination angles. In the form of FIG. 3, the gently falling portion 3 a whose inclination angle with respect to the surface of the building plate A is a gentle angle, and the sudden falling portion 3 b where the inclination angle with respect to the surface of the building plate A is a steep angle. Two types of inclined collapsed portions 3 are provided. The gently collapsing portion 3a is formed on the long block-shaped convex portion 1a, and the sudden collapsing portion 3b is provided on the short block-shaped convex portion 1b. By providing such a plurality of collapsing portions 3 having different inclination angles, a natural block-like pattern can be formed, and the butt portion can be made more difficult to understand.

  FIG. 5 is another example of the embodiment of the building board material A of the present invention. A description of the same parts as those in FIGS. 1 and 3 will be omitted.

  In the present embodiment, a vertical joint collapse portion 9 in which the surface of the end portion on the vertical joint 6 side collapses is formed in a part of the block-shaped convex portion 1 adjacent to the vertical joint 6 arranged in the center. . In the form of FIG. 5, the vertical joint collapse portion 9 is formed as an inclined surface with a surface and an end face cut out. This inclined surface may be a flat surface as shown in the figure, or may be a curved surface. Moreover, the vertical joint collapse part 9 may not be a slope, for example, may be stepped. However, in order to form a block-like pattern with a better appearance, the shape of the vertical joint collapse portion 9 is preferably the same shape as the collapse portion 3. The center may be between 1/5 and 4/5 in the horizontal direction.

  Thus, by forming the vertical joint collapse part 9, as shown in FIG. 6, the part where the surface collapsed will be formed not only in the butted part but also in the center of the building plate A, The butted portion of the building plate A can be made even less conspicuous.

  Further, in the illustrated form, a vertical joint collapse portion 9 is formed adjacent to the vertical joint 6 at a position substantially half of the building board A. Thereby, when cut | disconnecting by this vertical joint 6 and forming a 1/2 cut product, even when cut | disconnected the vertical joint 6 with the other board | plate material A for construction, it can make an abutting part inconspicuous. The convenience of the building plate A can be enhanced. In addition, the vertical joint collapse part 9 may be formed adjacent to the vertical joint 6 at a position of 1/4 or 3/4 in the horizontal direction.

  The dimension of the vertical joint collapse portion 9 can be formed in the same manner as the collapse portion 3. Thereby, a more natural appearance can be formed.

  In this embodiment, the vertical joint landslide portion 9 is formed by a plurality of inclined surfaces having different inclination angles, and the gentle vertical joint landslide portion 9a having a gentle inclination angle with respect to the surface of the plate A for construction, There are provided two types of sloping vertical joint collapse portions 9 and a steep vertical joint collapse portion 9b having a steep inclination angle with respect to the surface of the plate material A. The gentle vertical joint collapse portion 9a is formed on the long block-shaped convex portion 1a, and the steep vertical joint collapse portion 9b is provided on the short block-shaped convex portion 1b. By providing the plurality of vertical joint collapse portions 9 having different inclination angles, it is possible to make the butt portion more difficult to understand.

  The block-shaped convex part 1 in which the vertical joint collapse part 9 is formed is formed so as not to be arranged adjacent to each other in the horizontal direction. If the block-shaped convex portions 1 in which the vertical joint collapse portions 9 are formed are arranged adjacent to each other in the horizontal direction, the appearance of the block-like pattern may be impaired. The vertical joint collapse portions 9 may not be formed on both side end portions of the block-shaped convex portion 1 facing each other with the vertical joint 6 interposed therebetween, but the vertical joint collapse portion 9 is formed on either one of the side end portions. If formed, the butted portion can be made less noticeable.

  The vertical joint collapse portions 9 may be formed on the side opposite to the collapse portion 3 as shown in FIGS. 5B and 5C in the row of the block-shaped convex portions 1, as shown in FIG. As shown, it may be formed on the same side as the collapsed portion 3.

  In the form of FIG. 5, the vertical joint collapse portions 9 are randomly formed, but may be formed every other block-shaped convex portion 1 arranged in the vertical direction. That is, the arrangement is staggered in the vertical direction across the vertical joint 6. With such an arrangement, the vertical joint collapse portions 9 are not continuously arranged in the vertical direction, and a natural appearance can be given.

  And the wall surface formed with the board | plate material A for building of the form of FIG. 5, as shown in FIG. 6, a butting part is not conspicuous and a block-like pattern with a sense of unity is formed, and the design property is excellent. It becomes the outer wall.

A Architectural plate material 1 Block-shaped convex portion 2 Side end groove portion 3 Collapsed portion 4 Side end portion 5 Upper end groove portion 6 Vertical joint 7 Horizontal joint 8 Lower end groove portion 9 Longitudinal joint collapse portion 10 Block split groove

Claims (3)

  Side edges that have a plurality of block-shaped convex parts that are approximately the same in vertical width and are arranged so as to be continuous in the horizontal direction when constructed, and that form vertical joints when constructed on at least one side edge. A building plate provided with a groove part, and when constructed, a part of the block-like convex part adjacent to the side end groove part is formed as a collapsed part where the surface of the end part on the side end groove part side collapsed, The collapsible part is a building board material arranged so as not to be adjacent in the lateral direction when it is constructed.   The said collapsed part is the board | plate material for construction of Claim 1 currently formed in every other of the said block-shaped convex part arrange | positioned in the vertical direction.   A part of the block-shaped convex portion adjacent to the vertical joint formed in the center is formed with a vertical joint collapse portion in which the surface of the end portion on the vertical joint side collapses, and the vertical joint collapse portion is adjacent to the horizontal direction. The building board according to claim 1, wherein the building board is formed so as not to fit.

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