Construction methods for building walls, joint structures, and base preparation materials and primer materials

Abstract

To provide a construction method of a wall surface of a building in which a joint between plate members on a wall surface formed of the plurality of plate members is difficult to be visually recognized.SOLUTION: A construction method of a wall surface of a building comprises: a filling process of filling a base adjustment material 21 in a joint 111 between plate members 101 forming the wall surface of the building; an attachment process of attaching, on the joint 111 filled with the base adjustment material 21, a perforated core material layer 106 having an adhesive layer 162 on a wall surface side to level the perforated core material layer 106 with a pressing tool after the filling process; and a primer coating process of coating a primer material 31 on the plate members 101 including the joint 111 after the attachment process.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The technical field of this specification relates to a construction method for the wall surface of a building including joints between boards that form the wall surface of the building, a joint structure including joints between boards, and a base preparation material and a primer material used in the construction method for the wall surface. [Background technology]

[0002] As a construction method for joints between wall panel materials, a construction method has been known in the following Patent Document 1, in which a hard putty material is filled into the joints formed in the joints, elastic cloth and elastic putty material are layered over the joints to cover them, and then a coating material is applied to form a coating film. Also, a construction method has been known in the following Patent Document 2, in which an elastic body is inserted into the gaps formed in the joints, an elastic putty material is filled into the joints, and a coating material is applied to form a coating film. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-021287 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-107932 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional construction methods had no means of adjusting the thickness of the putty, which meant that unevenness could occur between the areas of the joint where the putty was filled and the other areas, which could make the joints between the boards visible.

[0005] The problem that the technology of this specification aims to solve has been made in consideration of the above points, and its object is to provide a construction method for the wall surfaces of buildings, in which the joints between the panels of a wall surface formed from multiple panels are difficult to see. [Means for solving the problem]

[0006] The construction method for a wall surface of a building according to an embodiment of the present specification includes a filling step of filling a base preparation material into joints of boards that form the wall surface of a building; a step of attaching a perforated core material layer having an adhesive layer on the wall surface side to the joint filled with the base adjustment material, and leveling the perforated core material layer with a pressing tool; A primer coating process is carried out after the pasting process, in which a primer is applied to the board material including the joint; The present invention is characterized by having the following.

[0007] According to the construction method for a wall surface of a building according to an embodiment of the present specification, the base adjustment material filled into the joints of the boards is discharged from the holes in the perforated core material layer by leveling the perforated core material layer attached to the joints filled with the base adjustment material with a pressing tool. This makes it possible to make the thickness of the base adjustment material uniform, and to achieve a finished wall surface formed from multiple boards in which the joints of the boards are difficult to see.

[0008] Here, the construction method for the wall surface of the above-mentioned building can include forming recessed joint portions at the joints of the boards, and before the filling process, including an insertion process of inserting a support member having a resin foam as a base material into the joint portion of the joint.

[0009] According to this, the construction method for the wall surface of a building in the embodiment can be applied to the joints of board materials where recessed joint portions are formed, and the support member can suppress recesses that occur in the joints due to shrinkage of the base adjustment material, resulting in a finished product in which the joints of the board materials are difficult to see.

[0010] Furthermore, in the above-described method for constructing a wall surface of a building, when the support member is inserted into the joint portion, a longitudinal gap can be formed on both short-side ends of the joint portion.

[0011] This allows the hardened base adjustment material layer, which is formed by filling the gaps in the joints with base adjustment material, to mitigate and absorb movements such as vibrations between the boards that form the joint, thereby preventing unevenness from occurring.

[0012] In addition, in the above-described construction method for a wall surface of a building, the perforated core material layer may be provided with a pressing layer on the wall surface side that presses the base adjustment material.

[0013] This allows the base adjustment material, or the base adjustment material and support member, to be pressed evenly, which promotes the base adjustment material to fill the joints and results in a finished product in which the seams of the boards are less visible.

[0014] Here, the joint structure according to the embodiment of the present specification is a joint structure of boards forming a wall surface of a building, in which a recessed joint portion is formed at the joint, A support member having a resin foam as a base material, which is extended in the longitudinal direction of the center of the short side of the joint portion; a surface adjustment material layer formed by solidifying a surface adjustment material embedded in the joint portion and in close contact with the support member from both ends in the short direction of the support member; a perforated core material layer that covers the surface adjustment material layer and is bonded to each of the boards that face each other across the joint portion; A primer layer formed by solidifying a primer material covering the perforated core material layer; The present invention is characterized by having the following.

[0015] According to the joint structure of the embodiment of this specification, the movement between the plates is mitigated and absorbed by the support member, base adjustment material, perforated core material layer and primer material, thereby preventing cracks from occurring in the coating film between the plates.

[0016] Further, the base preparation material and the primer material according to the embodiment of the present specification are the base preparation material and the primer material used in the construction method for the wall surface of the above-mentioned building, It is characterized in that it is composed of the same composition blend, with only the amount of dilution water being different.

[0017] According to the surface preparation materials and primer materials according to the embodiments of the present specification, since they are composed of the same compositional blend, the compositional blend can be standardized. [Effects of the Invention]

[0018] According to the construction method for a wall surface of a building of this specification, it is possible to achieve a finished wall surface formed from a plurality of plate materials in which the joints between the plate materials are difficult to see. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a front view of the perforated core layer of the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a perspective view of the support member of the first embodiment, as viewed from the front side. [Figure 5] FIG. 2 is a horizontal cross-sectional view of a vertical joint of boards forming a wall surface of a building according to the first embodiment, showing the state before construction. [Figure 6] FIG. 10 is a cross-sectional view showing the state after the charging process. [Figure 7] FIG. 10 is a cross-sectional view of the same, showing the state after the filling step. [Figure 8] FIG. 10 is a cross-sectional view showing the state of the adhering step. [Figure 9] This is the same cross-sectional view showing the state after the primer coating process. [Figure 10] FIG. 2 is a perspective view of a plate material painted according to the process sequence of the first embodiment, as seen from the front side. [Figure 11] FIG. 10 is a horizontal cross-sectional view of a vertical joint of the boards forming the wall surface of the building of the second embodiment, showing the state after the filling process. [Figure 12] FIG. 10 is a cross-sectional view showing the state of the adhering step. [Figure 13] This is the same cross-sectional view showing the state after the primer coating process. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, the joint structure of the wall surface of a building according to the first embodiment of this specification will be described with reference to Figures 1 to 10. The scope of the present invention is not limited to the scope disclosed in the embodiments. The joint structure of the wall surface of a building according to the first embodiment includes a support member 5 extending longitudinally from the center of the short side of the joint portion 12 in a recessed joint portion 12 formed in the joint 11 of the boards 1 forming the wall surface, a base adjustment material layer 2 formed by solidifying a base adjustment material 21 embedded in the joint portion 12 and adhering to the support member 5 from both ends of the short side of the support member 5, a perforated core material layer 6 covering the base adjustment material layer 2 and adhering to each of the boards 1 facing each other across the joint portion 12, and a primer layer 3 formed by solidifying a primer 31 covering the perforated core material layer 6. In this specification, the joint 11 of the boards 1 will be described using a vertical joint 11 as an example. Furthermore, as shown in Figure 10, the orientation of the wall surface (board material 1) of the building is determined by the up, down, left and right directions when the vertical joint 11 is viewed from the front, with the side to be constructed being the front and the opposite being the back, and as used in the illustration, U indicates top, D indicates bottom, L indicates left, R indicates right, F indicates front, and B indicates back.

[0021] As shown in Figures 5-10, the boards 1 were ceramic siding boards, each with a joint 11 between them, forming a wide, open joint 12 at the front. The boards 1 were cut out in half of their thickness, eliminating the front joints of the joints that connect the boards 1 together. The front corners of the boards 1 that form the joint 12 were rounded, forming inclined sides 14, resulting in the wide, open joint 12 at the front. The specific dimensions of the joint 12 were 3-4 mm deep (front-to-back), 8-9 mm wide (left-to-right) at the rear and 11-12 mm wide (front-to-back), and 910 mm long (vertical), the same length as the boards 1, but this length was extended by joining the boards 1 together. The reason for the range in the specific size of the joint 12 is due to dimensional tolerances that arise for the boards 1 and their attachment to the wall.

[0022] The support member 5 is a material that is inserted into the joints 12 and supports the perforated core layer 6 in the application step, which will be described in detail later. Figure 4 shows the appearance of the support member 5. The support member 5 has an apparent density of 30 kg / m 3 The support member 5 is made of a closed-cell low-density polyethylene foam as a base material and is provided with an adhesive layer 51 that adheres to the joints 12. The thermal conductivity of the support member 5 is 0.028 kcal / m·hr·°C. This allows it to suppress the effects of temperature changes from the outside on the building wall surface. Furthermore, because the support member 5 is a closed-cell foam, it can prevent further intrusion of rainwater if it is exposed to rainwater due to some defect after installation. The back side of the support member 5 is provided with an adhesive layer 51 that adheres to the joints 12. During installation, the support member 5 is fixed to the joints 12 by the adhesion of the adhesive layer 51. Note that before use (before installation), the adhesive layer 51 is protected by a release paper (not shown). The color of the support member 5 is similar to the color of the board material 1. This is to prevent the support member 5 from being visible through the board after installation. The specific dimensions of the support member 5 are a thickness (front-to-back direction) of 3 mm taking into account the dimensional tolerance of the depth of the joint portion 12, a width (left-to-right direction) of 7 mm, and a length (up-down direction) of 910 mm to match the length of the board material 1.

[0023] The base adjustment material 21 is a material that is filled into the joints 12 and hardens to form the base adjustment material layer 2. The base adjustment material 21 is a coating composition that uses acrylic resin as a binder, and its ingredients and amounts are listed in Table 1.

[0024] [Table 1] The acrylic resin used was an acrylic resin emulsion with a glass transition temperature (Tg) of -20°C. With a Tg of -20°C and a resin to filler (titanium oxide and calcium carbonate) ratio within the ranges listed in Table 1, the surface preparation layer 2 formed from the surface preparation material 21 has moderate flexibility. Therefore, when filled into the joints 12, the surface preparation layer 2 can mitigate and absorb the movement of the board 1, preventing cracks from occurring in the primer layer 3 and topcoat layer 4, which are applied in front of the surface preparation layer 2.

[0025] The Tg of an acrylic resin can be adjusted by adjusting the type and amount of the monomer used. Tg can be calculated using the Fox formula (Equation (1) below). Wi represents the mass fraction of monomer i, and Tgi represents the Tg (°C) of monomer i. The Tg of a monomer can be a known value, such as that listed in the Polymer Handbook (John Willey & Sons). 1 / (273+Tg)=Σ(Wi / (273+Tgi))···(1) The acrylic resin emulsion was prepared by adding an aqueous solution containing a surfactant to a reactor where the polymerization reaction proceeds, adjusting the temperature of the aqueous solution to 86°C, and then adding a pre-emulsified emulsion (pre-emulsified monomer components, milk surfactant, and water) and a polymerization initiator dropwise over a period of 2 hours to the reactor, where the monomer components were polymerized to produce a synthetic resin emulsion.

[0026] Commercially available titanium oxide with a median diameter d50 of 0.25 μm was used. Commercially available calcium carbonate with a median diameter d50 of 1.1 μm was used. Commercially available dispersants, thickeners, antifoaming agents, and preservatives were all used.

[0027] The surface preparation material 21 contains 11.5% of volatile matter, which provides excellent filling ability into the joints 12.

[0028] The perforated core material layer 6 is attached to the left and right boards 1 sandwiching the joint from the front side of the base adjustment material 21 filled in the joint 12, along the joint 12, and is a material that, over the long term, reduces and absorbs the movement of the boards 1. Furthermore, during construction, the perforated core material layer 6 is leveled from the front side with a pressing tool, causing excess base adjustment material 21 to be expelled from the holes 61b of the perforated core material layer 6, thereby adjusting the base adjustment material layer 2 to a uniform thickness.

[0029] As shown in Figures 1 to 3, the perforated core layer 6 is formed of a 100 mm wide mesh glass fiber sheet 61 as a base material, with the glass fiber portion 61a forming the core layer and the mesh of the mesh glass fiber sheet 61 forming the holes 61b. A pressure layer 63 made of a 35 mm wide polyester film is thermocompression bonded to the rear side of the mesh glass fiber sheet 61 at the center of the short side (left-right direction) of the mesh glass fiber sheet 61 in the longitudinal direction (up-down direction). When the perforated core layer 6 is attached along the joints 12 and leveled from the front side of the perforated core layer 6 with a pressure tool, the pressure layer 63 promotes the filling of the base adjustment material 21 into the joints 12, levels the surface (front side) of the base adjustment material 21, and allows excess base adjustment material 21 to escape to the left and right and be discharged out of the perforated core layer 6 through the holes 61b. This allows the thickness of the base adjustment material layer 2 to be uniform. The glass fiber portion 61a that forms the outer frame of the hole portion 61b is hydrophilic, and therefore reduces resistance when the base adjustment material 21 is discharged to the outside of the porous core material layer 6.

[0030] 2 and 3, an adhesive layer 62 made of acrylic resin is provided on the rear side of the reticulated glass fiber sheet 61 to which the pressure layer 63 is thermocompression-bonded. The adhesive layer 62 bonds the perforated core material layer 6 to the left and right boards 1 across the joints 12. This prevents the perforated core material layer 6 from shifting or peeling when the perforated core material layer 6 is leveled from the front side with a pressing tool. The adhesive layer 62 is formed on the glass fiber portions 61a of the reticulated glass fiber sheet 61, but not on the holes 61b, so it does not prevent the base adjustment material 21 from being discharged from the holes 61b to the outside of the perforated core material layer 6.

[0031] The colors of the perforated core layer 6 and the pressing layer 63 are similar to the color of the board material 1. This is to prevent the perforated core layer 6 from being visible after construction. Before use, the adhesive layer 62 is covered with a release film (not shown) to protect it from foreign matter such as dust.

[0032] The primer 31 is a material that adjusts the unevenness of the assembly of boards 1 that form the wall surface to make a smooth surface, and hardens to form the primer layer 3. By applying the primer 31, the perforated core layer 6 attached to the joints 12 is filled into the primer layer 3, and the wall surface is finished smoothly by the primer layer 3.

[0033] Primer 31 is obtained by diluting base preparation material 21 with water; that is, base preparation material 21 and base preparation material 31 are composed of the same compositional blend, differing only in the amount of dilution water. Specifically, base preparation material 31 is obtained by diluting base preparation material 21 listed in Table 1 with water to adjust the volatile content to 14%. The amount of dilution water is 30 parts by mass relative to the blend amount (wet state) in Table 1.

[0034] By forming the primer layer 3, the movement between the plates is alleviated and absorbed by the support member 5, the base adjustment material layer 2, the perforated core material layer 6 and the primer layer 3, thereby preventing cracks from occurring in the coating film (primer layer 3 and top coat layer 4) between the plates.

[0035] On the wall surface on which the primer layer 3 is formed, a topcoat material 41 is applied as a finishing material (decorative material) to form the topcoat layer 4 (Figure 10). The topcoat material 41 is a flexible finishing coating material that forms the finishing layer of the embodiment, as described in Patent Application No. 2020-146798, a patent application filed by the same patent applicant ("WellnestWall" (flexible exterior thin coating material manufactured by WELLNEST HOME Co., Ltd. ("Sunacout EX" (flexible exterior thin coating material manufactured by Sansho Co., Ltd.)). The same composition and formulation were used).

[0036] Next, a construction method for the wall surface of a building according to the first embodiment of this specification will be described. As shown in Figures 5 to 9, the construction method for the wall surface of a building according to the first embodiment is a construction method for the wall surface of a building that uses a board 1 having a recessed joint 12 formed at the joint 11 of the board 1, and is a construction method that performs the following steps in order: a loading step of loading a support member 5 into the joint 12; a filling step of filling the joint 12 with a base adjuster 21 that forms a base adjuster layer 2; a step of attaching a perforated core material layer 6 and leveling the perforated core material layer 6 with a pressing tool; and a primer application step of applying a primer 31 that forms a primer layer 3 to the board 1 including the joint 12.

[0037] The loading process of loading the support member 5 into the joint portion 12 is a process of loading the support member 5 along the longitudinal direction of the joint portion 12 at the center of the joint portion 12 in the lateral direction, with a longitudinal gap on both ends of the lateral direction of the joint portion 12, as shown in Figure 6. The support member 5 is temporarily placed on the bottom portion 13 of the joint portion 12, and then the release paper (not shown) protecting the adhesive layer 51 is peeled off to adhere the adhesive layer 51 of the support member 5 to the bottom portion 13 of the joint portion 12. The longitudinal gap is formed by at least the inclined side surfaces 14 of the joint portion 12.

[0038] The filling step of filling the joint area 12 with the base adjustment material 21 that will form the base adjustment material layer 2 was carried out by using a putty spatula to fill the joint area 12 with the base adjustment material 21. At this time, as shown in Figure 7, the base adjustment material 21 was filled into the joint area 12, piling up about 2 mm forward to prevent any lack of filling. In addition, as shown in Figure 10, the base adjustment material 21 was applied to a width that exceeded the left and right width (35 mm) of the pressing layer 63 of the perforated core material layer 6 that would be applied in the next step.

[0039] The application process of the perforated core layer 6 and leveling it with a pressing tool involved applying the perforated core layer 6 along the joints 12 before the base adjustment material 21 filled in the joints 12 hardened, and then leveling the perforated core layer 6 with a plastering trowel, which was a pressing tool. When applying the perforated core layer 6, the base adjustment material 21 was applied beyond the left and right width of the pressing layer 63. Therefore, by applying the pressing layer 63 so that it does not protrude beyond the base adjustment material 21, the base adjustment material 21 can be used as a guide for positioning the perforated core layer 6. When the perforated core layer 6 is applied to the joints 12, the mesh-like glass fiber sheet 61, which exceeds the left and right width of the base adjustment material 21, adheres to the left and right boards 1 by the adhesive layer 62. This prevents the perforated core layer 6 from peeling off when leveling with the plastering trowel. When the perforated core material layer 6 is leveled with a plastering trowel, the base adjustment material 21 that has been piled up and filled into the joint areas 12 is evenly pressed by the pressing layer 63, facilitating the filling of the joint areas 12. The excess base adjustment material 21 is ejected from the left and right holes 61b of the pressing layer 63 to the outside of the perforated core material layer 6. The ejected base adjustment material 21 is applied to an area exceeding the left and right width of the pressing layer 63. Furthermore, a support member 5 having a thickness (front-to-back direction) equal to or 1 mm thinner than the depth of the joint areas 12 is inserted into the joint areas 12, allowing the perforated core material layer 6 to be attached to the wall surface without any irregularities. Furthermore, the perforated core material layer 6 is kept flat by the left and right boards 1 and the support members 5 in the joint areas 12, so it resists shrinkage when the base adjustment material 21 hardens, maintaining a finish in which the joints 11 of the boards 1 are difficult to see.

[0040] The primer application process, which applies primer 31 to form primer layer 3 on board 1, including joint area 12, was carried out by using a plastering trowel to apply primer 31 to the entire board 1, including joint area 12 to which perforated core layer 6 had been attached, after the base preparation material 21 had hardened. Because base preparation material 21 and primer 31 are composed of the same composition, differing only in the amount of dilution water, the number of coating materials used can be reduced. Furthermore, because they have the same composition, the base preparation material layer 2 and primer layer 3 formed from base preparation material 21 and primer 31 have the same linear expansion coefficient. This allows for the same expansion and contraction due to temperature changes and vibrations on the wall surface, preventing unevenness and delamination due to differences in linear expansion coefficients.

[0041] As shown in FIG. 10, a topcoat material 41 was applied as a finishing material (decorative material) to the wall surface on which the undercoat material layer 3 was formed, thereby forming a topcoat material layer 4.

[0042] The joint structure of the boards 1 forming the wall surface of the building of the first embodiment constructed in this manner can produce a finish in which the joints 11 of the boards 1 are difficult to see at the joints 12 of the boards 1 during construction. The support member 5 can prevent depressions that occur at the joints 11 due to shrinkage of the base preparation material 21 at the joints 12, thereby maintaining a finish in which the joints 11 of the boards 1 are difficult to see. The joint structure of the boards 1 forming the wall surface of the building of the first embodiment is particularly suitable for large-wall construction methods in which multiple boards 1 are lined up to form a single large wall. Furthermore, after construction, the movement of the joints 11 between the boards is alleviated and absorbed by the support member 5, base preparation material layer 2, perforated core material layer 6, and primer layer 3, preventing cracks from occurring in the coating film at the joints 11 between the boards.

[0043] Next, a joint structure for a wall surface of a building according to the second embodiment will be described with reference to Figures 11 to 13. The joint structure for a wall surface of a building according to the second embodiment differs from the joint structure for a wall surface of a building according to the first embodiment in that no joints are formed at the joints 111 of the boards 101 that form the wall surface, that no support members are inserted into the joints because no joints are formed, and that the perforated core material layer 106 does not have a pressing layer. As the rest of the structure is the same as the joint structure for a wall surface of a building according to the first embodiment, the same reference numerals as in the first embodiment are used for corresponding elements, and their description will be omitted.

[0044] The joint structure of the wall surface of a building in the second embodiment, in which no joint portion is formed, comprises a base adjustment material layer 2 formed by solidifying base adjustment material 21 embedded in the joints 111 of the boards 101 that form the wall surface, a perforated core material layer 106 that covers the base adjustment material layer 2 and is adhered to each of the boards 101 facing each other across the joint portion 12, and a primer layer 3 formed by solidifying primer material 31 that covers the perforated core material layer 106.

[0045] As shown in FIGS. 11 to 13, ceramic siding boards were used for the boards 101, in which the boards 101 were joined together by butting seams 111.

[0046] The base adjustment material 21 is embedded in the joint 111 by stroking. Stroking is a method of applying a coating material thinly and evenly by rubbing with a plastering trowel. The base adjustment material 21 is the same as that used in the first embodiment, and contains 11.5% volatile matter. This gives it excellent filling properties into the joint 111.

[0047] The perforated core layer 106 differs from the perforated core layer 6 of the first embodiment in that it does not have a pressing layer, but is otherwise the same as the perforated core layer 6 of the first embodiment. The perforated core layer 106 is attached to the left and right plate materials 101 across the seam 111. The perforated core layer 6 is adhered to the left and right plate materials 101 that sandwich the seam 111 by the adhesive layer 62. Therefore, when the perforated core layer 6 is smoothed from the front side with a pressing tool, shifting and peeling of the perforated core layer 6 is suppressed.

[0048] The primer material 31 and top coat material 41 are the same as those used in the first embodiment.

[0049] Next, a construction method for the wall surface of a building according to the second embodiment will be described. As shown in Figures 11 to 13, the construction method for the wall surface of a building according to the second embodiment is a construction method that includes a filling step of filling the joints 111 of the boards 101 that form the wall surface of the building with a base preparation material 21, a pasting step of attaching a perforated core material layer 106 having an adhesive layer 162 on the wall surface side to the joints 111 filled with the base preparation material 21 and smoothing the perforated core material layer 106 with a pressing tool, and a primer application step of applying a primer 31 to the boards 101 including the joints 111.

[0050] The filling step of filling the joints 111 of the board material 101 with the base adjustment material 21 was carried out by filling the joints 111 with the base adjustment material 21 by pressing. This makes it possible to make the joints 111 smooth and without any steps.

[0051] The attachment step of attaching the perforated core layer 6 and leveling the perforated core layer 6 with a pressing tool was carried out by attaching the perforated core layer 6 along the seam 111 and leveling the perforated core layer 6 using a pressing tool. When the perforated core layer 6 is attached to the seam 111, the reticulated glass fiber sheet 61 spanning the seam 111 is adhered to the left and right boards 101 by the adhesive layer 62.

[0052] The primer application process of applying primer 31 to board material 101 including joint 111 and the process of applying topcoat material 41 as a finishing material (decorative material) to form topcoat material layer 4 are the same as in the first embodiment.

[0053] The joint structure of the boards 101 forming the wall surface of the building of the second embodiment constructed in this manner can produce a finish in which the joints 111 of the boards 101 are difficult to see during construction. It is particularly suitable for large-wall construction methods in which a large number of boards 101 are lined up to form a single large wall. Furthermore, after construction, the movement of the boards at the joints 111 is alleviated and absorbed by the base adjustment material layer 2, the perforated core material layer 106, and the primer layer 3, and cracks can be prevented from occurring in the coating film at the joints 111 between the boards.

[0054] The joint structure of the wall surface of the building of the embodiment can also be implemented by changing its configuration to the following form.

[0055] In the joint structure of the wall surface of the building in the embodiment, ceramic siding boards are used for the boards 1, 101, but the boards 1, 101 are not limited to this and metal siding boards, wood siding boards, ALC, extruded cement boards, etc. can also be used. Also, in the embodiment, the vertical joint 11 is described as an example, but the direction of the joint 11 can also be horizontal or diagonal. Of course, the structure can be applied to both new construction and renovation of buildings.

[0056] The construction method for the wall surface of a building according to the second embodiment is a construction method that includes a filling step of filling the joints 111 of the boards 101 that form the wall surface of the building with base preparation material 21, an attachment step of attaching a perforated core material layer 106 having an adhesive layer 162 on the wall surface side to the joints 111 filled with base preparation material 21 and leveling the perforated core material layer 106 with a pressing tool, and a primer application step of applying a primer 31 to the boards 101 including the joints 111. However, in the construction method for the wall surface of a building according to the second embodiment, if the joints 111 do not have any unevenness such as steps, the filling step of filling the base preparation material 21 can be omitted.

[0057] In the joint structure for the wall surface of a building according to the first embodiment, the joint 12 is described as having a depth of 3 to 4 mm, a width of 8 to 9 mm (rear side) and 11 to 12 mm (front side), and a wide opening at the front side. However, the joint 12 is not limited to this, and a joint structure can be formed with various shapes and dimensions as long as the joint 12 is formed at the joint 11 of the board material 1. Suitable dimensions for the joint 12 include a depth of 2 to 50 mm, a width of 2 to 50 mm at the rear side, and a width of 2 to 100 mm at the front side. If the joint 12 is smaller than these dimensions, it may be difficult to insert the support member 5. On the other hand, if the joint 12 is larger than these dimensions, the joint 11 may become indented due to shrinkage during hardening of the base adjustment material 21. The shape and dimensions of the support member 5 can also be changed appropriately to match the shape and dimensions of the joint portion 12, but the thickness of the support member 5 can be the same as or 1 mm shorter than the depth of the joint portion 12, or in another embodiment, 0.5 to 1 mm shorter than the depth of the joint portion 12.

[0058] In the joint structure of the wall surface of the building of the first embodiment, the support member 5 uses a closed-cell low-density polyethylene foam as the base material and is provided with an adhesive layer 51 that adheres to the joint portion 12, but the support member 5 is not limited to this. For example, the support member 5 may be made only of a closed-cell low-density polyethylene foam and fixed to the joint portion 12 using an adhesive, double-sided tape, or the like.

[0059] In the first embodiment of the joint structure for the building wall, a low-density polyethylene foam with a thermal conductivity of 0.028 kcal / m·hr·°C is used for the support member 5. However, if the support member 5 has a thermal conductivity of 0.05 kcal / m·hr·°C or less, the effects of temperature changes from outside the building wall can be suppressed. If the thermal conductivity of the support member 5 exceeds 0.05 kcal / m·hr·°C, the thin plate material 1 in the joint portion may be affected by temperature changes from outside. In another embodiment, the thermal conductivity of the support member 5 can be 0.04 kcal / m·hr·°C or less, and in yet another embodiment, the thermal conductivity of the support member 5 can be 0.03 kcal / m·hr·°C or less. The lower limit of the thermal conductivity of the support member 5 is 0.02 kcal / m·hr·°C, which is approximately the thermal conductivity of air (20°C).

[0060] In the joint structure of the wall surface of the building of the first embodiment, the support member 5 has an apparent density of 30 kg / m 3 In the present embodiment, a closed-cell low-density polyethylene foam is used, but the support member 5 is not limited to this. The apparent density of the support member 5 is 5 to 500 kg / m 3 If the apparent density of the support member 5 is 5 kg / m 3 If the pressure is less than 500 kg / m, the perforated core layer 6 may be deformed during the application process in which the perforated core layer 6 is leveled with a pressing tool, and the seam 11 may not be finished smoothly. 3 If the apparent density exceeds 100 kg / m, the support member 5 may slip down due to its own weight, and the joint 11 may not be finished smoothly. 3 In another embodiment, the density is 20 to 50 kg / m 3The material of the support member 5 can be any common resin foam made of polyurethane, polystyrene, polyphenol, etc. The foam is not limited to closed-cell foam, and even open-cell foam can be used by coating the surface with a resin coating agent.

[0061] In the embodiment, the perforated core layer 6 uses a reticulated glass fiber sheet 61 having a width of 100 mm as the substrate, but the substrate of the perforated core layer 6 is not limited to this. The width of the perforated core layer 6 can be 50 to 150 mm. This is because the perforated core layer 6 can be easily attached by overlapping it with the joints 12. If the width is less than 50 mm, the narrow width may cause the perforated core layer 6 to come off the joints 12 during attachment. On the other hand, if the width exceeds 150 mm, the substrate of the perforated core layer 6 is prone to warping and wrinkling, which may result in a finish in which the joints 11, 111 of the boards 1, 101 are difficult to see. In another embodiment, the width of the perforated core layer 6 can be 70 to 130 mm, and in yet another embodiment, 80 to 120 mm. The substrate of the perforated core layer 6 is not limited to the reticulated glass fiber sheet 61; a reticulated resin fiber sheet, stainless steel mesh, etc. may also be used. The thickness of the base material of the perforated core layer 6 can be 0.1 to 0.5 mm if it is a meshed glass fiber sheet 61, 0.2 to 0.5 mm if it is a meshed resin fiber, or 0.02 to 0.2 mm if it is a stainless steel mesh.

[0062] In the joint structure of the wall surface of the building of the first embodiment, the left and right width of the pressing layer 63 is set to 35 mm, but if it exceeds the width (front side) of the joint portion 12, the base adjustment material layer 2 formed from the base adjustment material 21 can be adjusted to a uniform thickness. This is because the pressing layer 63 with a width exceeding the width of the joint portion 12 presses the base adjustment material 21 filled in the joint portion 12 uniformly all over.

[0063] In the embodiment, a plastering trowel is used as the pressing tool to press the perforated core material layer 6, but the pressing tool is not limited to this and a putty spatula (made of plastic or metal), a plastic roller, a metal roller, etc. can also be used.

[0064] In the embodiment, the topcoat 41 is a flexible coating material ("WellnestWall" (flexible thin exterior coating material manufactured by WELLNEST HOME Co., Ltd.)) that forms the finishing layer of the embodiment, as described in Japanese Patent Application No. 2020-146798. However, any flexible coating material can be used for the topcoat 41. Flexible coating materials include flexible thin exterior coating materials and waterproof thin exterior coating materials as specified in JIS A 6909 (2014) "Architectural Finishing Coating Materials."

[0065] In the embodiment, the volatile content of the surface preparation material 21 is 11.5%, but if the volatile content of the surface preparation material 21 is 5 to 30%, excellent filling ability into the joints 12 can be achieved. If the volatile content of the surface preparation material 21 is less than 5%, the surface preparation material 21 may lack fluidity and may be poorly able to fill the joints 12. On the other hand, if the volatile content exceeds 30%, when filling the joints 12 that require thickness, shrinkage during hardening of the surface preparation material 21 may be significant, making it difficult to obtain a smooth finish. In another embodiment, the volatile content of the surface preparation material 21 may be 10 to 20%, and in yet another embodiment, 10 to 15%.

[0066] In the embodiment, the volatile content of the primer 31 is 14%, but if the volatile content of the primer 31 is 10 to 40%, the primer 31 can be made to have excellent workability. If the volatile content of the primer 31 is less than 10%, the primer 31 may not have the fluidity necessary for application, and workability may be poor. On the other hand, if it exceeds 40%, the primer 31 may shrink significantly when hardening, and a smooth finish may not be obtained. In another embodiment, the volatile content of the primer 31 may be 12 to 25%, and in yet another embodiment, 12 to 20%.

[0067] In the embodiment, the primer application step of applying the primer 31 to form the primer layer 3 on the board 1 including the joint portion 12 was performed after the base preparation material 21 had hardened, but the primer application step can also be performed before the base preparation material 21 has hardened. This is because the base preparation material 21 and the primer 31 are made from the same compositional blend, so no adverse effects will occur from mixing them.

[0068] In the embodiment, the base preparation material 21 (including the primer 31; the same applies hereinafter except for the explanation of the reference numerals) used had the component composition shown in Table 1. However, the component composition of the base preparation material 21 is not limited thereto, and any component within the preferred composition range when the amount of acrylic resin is fixed, as shown in Table 1, can be used as the base preparation material 21. Specifically, the base preparation material 21 can be blended with 1 to 100 parts by weight of titanium oxide per 100 parts by weight of the non-volatile acrylic resin, thereby providing base hiding properties and excellent workability. If the amount of titanium oxide blended is less than 1 part by weight per 100 parts by weight of the non-volatile acrylic resin, the base hiding properties may be poor. On the other hand, if the amount exceeds 100 parts by weight, the amount of fine titanium oxide increases, which may result in poor workability. In another embodiment, 5 to 50 parts by weight of titanium oxide can be blended with 10 to 30 parts by weight per 100 parts by weight of the non-volatile acrylic resin. In addition, the titanium oxide blended into the base conditioner 21 can be omitted, provided that the topcoat material 41 has sufficient hiding power. Furthermore, the base conditioner 21 can be blended with 300 to 1,000 parts by weight of calcium carbonate per 100 parts by weight of nonvolatile acrylic resin, thereby providing conformability to the movement of the base while suppressing shrinkage during hardening. If the blending amount of calcium carbonate is less than 300 parts by weight per 100 parts by weight of nonvolatile acrylic resin, shrinkage during hardening may not be suppressed. On the other hand, if it exceeds 1,000 parts by weight, conformability to the movement of the base may be poor. In another embodiment, 400 to 900 parts by weight of calcium carbonate can be blended per 100 parts by weight of nonvolatile acrylic resin, and in yet another embodiment, 500 to 800 parts by weight of calcium carbonate can be blended.

[0069] In the embodiment, an acrylic resin emulsion with a glass transition temperature (Tg) adjusted to −20° C. was used as the acrylic resin compounding component of the base preparation material 21, but the acrylic resin is not limited to this, and for example, a commercially available product can also be used. Commercially available acrylic resin emulsions such as Polytron (manufactured by Asahi Kasei Corporation), Pegal (manufactured by High Pressure Gas Industrial Co., Ltd.), and Acronal (manufactured by BASF Ltd.) can be appropriately selected and used. Furthermore, acrylic resin refers to a resin whose main skeleton is acrylic resin, and acrylic copolymer resins such as styrene-acrylic copolymer resin, urethane-acrylic copolymer resin, and silicone-acrylic copolymer resin are also included in the acrylic resin of the embodiment.

[0070] In the embodiment, an acrylic resin emulsion with a resin Tg of -20°C was used as the acrylic resin compounding component of the base preparation material 21, but any resin with a Tg of -45 to 0°C can be used as the acrylic resin for the base preparation material 21. If the resin's Tg is less than -45°C, the base preparation material layer 2 (primer layer 3) formed from the base preparation material 21 will be soft and may deform when subjected to external force. On the other hand, if the Tg exceeds 0°C, the base preparation material layer 2 formed from the base preparation material 21 will harden and will not be able to follow the movement of the plate material 1, which may cause cracks. In another embodiment, the resin's Tg can be -38 to -10°C, and in yet another embodiment, it can be -30 to -15°C. [Explanation of symbols]

[0071] 1...board material, 2...base adjustment material layer, 3...primer material layer, 4...top coat material layer, 5...support member, 6...perforated core material layer, 11...seam, 12...joint portion, 13...bottom, 14...inclined side, 21...base adjustment material, 31...primer material, 41...top coat material, 51...adhesive layer, 61...reticulated glass fiber sheet, 61a...glass fiber portion, 61b...hole portion, 62...adhesive layer, 63...pressure layer, 101...board material, 106...perforated core material layer, 111...seam, 162...adhesive layer.

Claims

1. A construction method for a wall surface of a building in which a recessed joint portion is formed at the joint of the board material that forms the wall surface, A loading step of loading a support member having a resin foam as a base material into the joint portion; a filling step of filling the joint into which the support member has been inserted with a surface preparation material; a step of attaching a perforated core material layer having an adhesive layer on the wall surface side to the joint filled with the base adjustment material, and leveling the perforated core material layer with a pressing tool; A primer coating process is carried out after the pasting process, and applies a primer to the board material including the joint. The method for constructing a wall surface of a building is characterized in that the thickness of the support member is the same as or 1 mm thinner than the depth of the joint portion.

2. 2. The method for constructing a wall surface of a building according to claim 1, wherein when the support member is inserted into the joint portion, a gap is formed in the longitudinal direction on both ends of the short side of the joint portion.

3. 2. The method for constructing a wall surface of a building according to claim 1, wherein the perforated core material layer has a pressing layer on the wall surface side that presses the base adjustment material.

4. A construction method for the wall surface of a building as described in claim 3, characterized in that the color of the perforated core material layer and the pressing layer is the same color as the color of the board material (a color that prevents the support member from being seen through after construction).

5. A joint structure of boards forming a wall surface of a building, in which a recessed joint portion is formed at the joint, A support member having a resin foam as a base material, which is extended in the longitudinal direction of the center of the short side of the joint portion; a surface adjustment material layer formed by solidifying a surface adjustment material embedded in the joint portion and in close contact with the support member from both ends in the short direction of the support member; a perforated core material layer that covers the surface adjustment material layer and is bonded to each of the boards that face each other across the joint portion; and a primer layer formed by solidifying a primer material that covers the perforated core layer; The joint structure is characterized in that the thickness of the support member is the same as or 1 mm thinner than the depth of the joint portion.

Images