Interior construction method

Abstract

To provide an interior construction method capable of suppressing condensation in a concealing part between an indoor space and an outdoor space with a simple configuration.SOLUTION: A concealing part (22) comprises: an interior material (2) whose front face faces an indoor space; a heat-insulating material (3); a substrate material (4); and metallic screws (5, 5A) which penetrate the interior material, the heat insulating material, and the substrate material and protrude from the substrate material to the concealing part side. An interior construction method includes the steps of: preparing, as the metallic screws (5), the first metallic screw (5) with a short protrusion length that protrudes from the substrate material toward the concealing part side and the second metallic screw (5A) with a long protrusion length that protrudes from the substrate material toward the concealing part; selecting the first metallic screw (5) when the lowest setting temperature of an indoor space (21) is set to a relatively high T1; and selecting the second metallic screw (5A) when the lowest setting temperature of the indoor space (21) is set to a relatively low T2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an interior construction method for suppressing condensation in a concealed portion between an indoor space and an outdoor space. [Background technology]

[0002] BACKGROUND ART Conventionally, heat insulating panels, for example, have been proposed as a measure against condensation on interior materials such as wall materials or ceiling materials of buildings.

[0003] Japanese Patent Laid-Open Publication No. 8-246609 (Patent Document 1) discloses a roof structure in which fireproof material, heat insulating material, and a waterproof layer are layered in that order above a half-height roof toward the outdoors, and then secured with screws. This roof structure can improve insulation, heat resistance, and fire resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-246609 Summary of the Invention [Problem to be solved by the invention]

[0005] The roof structure of Patent Document 1 is insufficient to prevent condensation caused by the temperature difference between the indoor and outdoor spaces. In addition, the structure is large-scale because it requires multiple members to be stacked above the half-height roof.

[0006] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide an interior construction method that can suppress condensation in concealed areas between indoor and outdoor spaces with a simple configuration. [Means for solving the problem]

[0007] An interior construction method according to one aspect of the present invention is an interior construction method for suppressing condensation in a concealed area between an indoor space and an outdoor space, wherein the concealed area comprises an interior material whose surface faces the indoor space, an insulating material superimposed on the back side of the interior material, a base material positioned on the insulating material, and a metal screw that penetrates the interior material, the insulating material, and the base material and protrudes from the base material toward the concealed area, and the interior construction method comprises the steps of preparing, as the metal screws, a first metal screw that protrudes from the base material toward the concealed area with a short protruding length and protruding from the base material toward the concealed area, and a second metal screw that protrudes from the base material toward the concealed area with a long protruding length, and selecting the first metal screw when the minimum set temperature of the indoor space is set to a relatively high T1, and selecting the second metal screw when the minimum set temperature of the indoor space is set to a relatively low T2.

[0008] Preferably, when selecting the optimum metal screw from among a plurality of types of metal screws having different lengths of protrusion from the base material toward the concealed portion, the thermal resistance of the heat insulating material is further taken into consideration.

[0009] Another aspect of the present invention provides an interior construction method for suppressing condensation in a concealed area between an indoor space and an outdoor space, wherein the concealed area comprises an interior material whose surface faces the indoor space, an insulating material superimposed on the back side of the interior material, a base material positioned on the insulating material, and a metal screw that penetrates the interior material, the insulating material, and the base material and protrudes from the base material toward the concealed area, and the interior construction method includes the steps of preparing, as the metal screws, a first metal screw that protrudes from the base material toward the concealed area with a short protruding length and protruding from the base material toward the concealed area, and a second metal screw that protrudes from the base material toward the concealed area with a long protruding length, and selecting the first metal screw when the thermal resistance of the insulating material is set to a relatively high R1, and selecting the second metal screw when the thermal resistance of the insulating material is set to a relatively low R2.

[0010] Preferably, the protruding length of the metal screw is equal to or greater than 10 mm and equal to or less than 100 mm.

[0011] Preferably, the thermal resistance of the insulation is 1.0 m 2 K / W or more. [Effects of the Invention]

[0012] According to the interior construction method of the present invention, it is possible to suppress condensation in the concealed portion between the indoor space and the outdoor space with a simple configuration. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are diagrams showing a building according to the present embodiment, in which (A) is a longitudinal cross-sectional view and (B) is a view seen from the arrow II in FIG. 1A. [Figure 2] 1A and 1B are cross-sectional views showing a schematic view of a part of the concealing portion in this embodiment, in which (A) uses a short metal screw, and (B) uses a long metal screw. [Figure 3] 3A and 3B are analytical models simulating an air-conditioned indoor space, where (A) is an external view, and (B) and (C) are enlarged views of a portion of FIG. 3A. [Figure 4] 10 is a table showing the relationship between the minimum set temperature of an indoor space and the surface temperature of a protruding portion of a metal screw. [Figure 5] 1 is a table showing the relationship between the protrusion length of the protrusion of a metal screw and the surface temperature. [Figure 6] 10 is a graph showing the relationship between the protrusion length of the protruding part of a metal screw and the thermal resistance of the insulating material when the minimum set temperature of the indoor space is set to 13°C. [Figure 7] 10 is a graph showing the relationship between the protrusion length of the protruding part of a metal screw and the thermal resistance of the insulating material when the minimum set temperature of the indoor space is set to 12°C. [Figure 8] 10 is a graph showing the relationship between the protrusion length of the protruding part of a metal screw and the thermal resistance of the insulating material when the minimum set temperature of the indoor space is set to 11°C. [Figure 9] 10 is a graph showing the relationship between the protrusion length of the protruding part of a metal screw and the thermal resistance of the insulating material when the minimum set temperature of the indoor space is set to 10°C. [Figure 10] FIG. 1 is a schematic cross-sectional view showing a typical building. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which like reference numerals denote like or corresponding parts and will not be described repeatedly.

[0015] First, before describing the interior structure according to this embodiment, a brief description will be given of condensation that occurs in summer in general non-residential buildings such as factories, warehouses, temporary facilities, and laboratories with reference to FIG. 10.

[0016] Referring to FIG. 10 , a building 100 has a half-height roof with roofing material 101 supported by exterior walls 102. The roofing material 101 and exterior walls 102 face an outdoor space 120. A ceiling material 112 is provided below the roofing material 101, and an attic space 122 is formed between the roofing material 101 and the ceiling material 112. An interior wall 113 is provided on the indoor space 121 side of the exterior wall 102, and a back-of-wall space 123 is formed between the exterior wall 102 and the interior wall 113. The attic space 122 and the back-of-wall space 123 are also referred to as "concealed portions." The ceiling material 112 and the interior walls 113 are attached using a general light-weight steel base construction method. The light-weight steel base construction method is a method in which interior materials such as plasterboard are fixed to a general light-weight steel base with metal screws.

[0017] In such a building 100, air conditioning is performed in the indoor space 121 during the summer when the outside air is hot and humid. Heat insulating materials are used in the ceiling material 112 and the interior wall 113, mainly for the purpose of reducing the air conditioning load. If the performance of the heat insulating material is poor, the temperature on the ceiling space 122 side of the ceiling material 112 will drop below the dew point temperature of the ceiling space 122, and condensation C1 will occur on the ceiling space 122 side of the ceiling material 112. Furthermore, the temperature on the back-of-wall space 123 side of the interior wall 113 will also drop below the dew point temperature, and condensation C2 will occur on the back-of-wall space 123 side of the interior wall 113.

[0018] On the other hand, the heads of the metal screws used to attach the ceiling material 112 and the interior wall 113 are exposed on the indoor space 121 side, and the tips of their shanks protrude towards the concealed portions 122, 123. Metal screws are generally made of steel and have high thermal conductivity. Therefore, the heads of the metal screws are cooled by the low-temperature air in the indoor space 121 cooled by air conditioning, and the shanks of the metal screws are also cooled by the thermal bridge. As a result, the surface temperature of the tips of the shanks of the metal screws protruding towards the concealed portions 122, 123 becomes lower than the temperature of the concealed portions 122, 123, and condensation occurs on the surface of the tips of the shanks of the metal screws.

[0019] In order to alleviate the occurrence of condensation in the concealed parts caused by such factors, this embodiment focuses particularly on the metal screws protruding into concealed parts 122 and 123, and suppresses the occurrence of condensation on the metal screws. Below, the structure of the concealed parts that can suppress condensation will be described in detail.

[0020] <About the overview> An overview of a building 1 in this embodiment will be described with reference to Figures 1(A) and 1(B). In this embodiment, the building 1 is a facility in which the temperature of an indoor space 21 is set to a constant temperature, such as a general factory, warehouse, temporary facility, research laboratory, or other non-residential building.

[0021] The building 1 includes a folded-plate roofing material 11, opposing exterior walls 12, and multiple beams 17 that support the roofing material 11. The beams 17 are assumed to be H-shaped, corresponding to a so-called main beam, but may also be sub-beams that are perpendicular to the main beam. The multiple beams 17 extend in a first direction (the direction indicated by arrow A1 in FIG. 2) and are spaced apart from one another in a second direction (the direction indicated by arrow A2 in FIGS. 1 and 2) that is perpendicular to the first direction.

[0022] In this embodiment, the ceiling structure 10 is arranged using these beams 17. In the following description, the small space above the ceiling structure 10 (the space between the roof material 11 and the ceiling structure 10) is referred to as the "attic space 22." The attic space 22 is a concealed portion, and the concealed portion includes the ceiling structure 10. Furthermore, the large space below the ceiling structure 10 (the space between the ceiling structure 10 and the floor 16) is referred to as the "indoor space 21." Note that the ceiling structure 10 described below may be used not only in one-story buildings but also in multi-story buildings. Furthermore, an interior wall structure 30 is arranged in the indoor space 21 of the exterior wall 12. The space between the interior wall structure 30 and the exterior wall 12 is referred to as the "wall space 23." Note that the ceiling structure 10 and the interior wall structure 30 are collectively referred to as the "interior structure." In the following description, the ceiling structure 10 will be described, but approximately the same configuration as the ceiling structure 10 is also applied to the interior wall structure 30, although there are differences in direction and materials used.

[0023] Furthermore, the temperature environment in the concealed portions of the attic space 22 and the back-of-wall space 23 changes depending on the airtightness of the building 1. In the case where the building 1 is, for example, using a third-class mechanical ventilation system, if there are many gaps in the exterior of the building 1, hot and humid air (outside air) from the outdoor space 20 will enter the concealed portions through the gaps. As a result, the temperature and humidity in the concealed portions may approach the temperature and humidity of the outside air. In the present embodiment, the building 1 has many gaps in the exterior, uses a third-class mechanical ventilation system, and the temperature and humidity in the concealed portions are assumed to be approximately the same as the outside air (i.e., hot and humid).

[0024] <About the ceiling structure (interior structure)> Next, a description will be given of a ceiling structure 10 according to this embodiment. Referring to Fig. 2(A), the ceiling structure 10 includes an interior material 2 whose surface faces an indoor space 21, a heat insulating material 3 superimposed on the back side of the interior material 2, a base material 4 positioned on the heat insulating material 3, and metal screws 5 that penetrate these.

[0025] The interior material 2 is, for example, a ceiling material, and also includes, for example, a finishing material and a decorative material. The interior material 2 is a surface material, and its front surface (the bottom surface in FIG. 2(A)) faces the indoor space 21, and its back surface (the top surface in FIG. 2(A)) faces the heat insulating material 3. The interior material 2 is attached across multiple base materials 4. Specifically, as shown in FIG. 1(B), the interior material 2 is preferably attached to the entire ceiling.

[0026] The heat insulating material 3 is preferably a foam heat insulating material with excellent moisture resistance, such as polyethylene foam or phenol foam. The heat insulating material 3 has a moisture permeability resistance of 0.0069[(m 2 ·s·Pa) / ng] or more. 2 ·s·Pa) / ng] or more, condensation at the interface between the heat insulating material 3 and the interior material 2 can be suppressed in the temperature and humidity environment of the concealed area expected in summer.

[0027] Insulation 3 has a thermal resistance of 1.0 m 2 It is preferable that the thermal resistance is 1.0m 2 If the thermal resistance is 3.0 m / s or more, a sufficient reduction in the air conditioning load can be expected. 2 It is preferable that the thermal resistance is 3.0m 2 Insulating materials with a rating of 100 K / W or less have the advantage of being widely available on the market and easy to obtain. The thickness of the insulating material 3 is preferably 100 mm or less. If it is 100 mm or less, it can be installed by fixing with screws. Insulating materials 3 with different thermal resistances can be selected depending on the protruding length of the protruding portion 52b of the screw 5. Details will be described later.

[0028] The metal screw 5 is preferably made of steel, but may be made of any metal such as stainless steel, brass, aluminum, or magnesium. The screw 5 includes a head 51 and a shaft 52. The head 51 has a groove in the shape of a "+" or "-", and serves as an operating part for screwing in the screw 5. The head 51 is exposed on the indoor space 21 side. After the screw 5 is screwed in, the head 51 serves as a retaining part for preventing it from coming out of the base material 4.

[0029] The shaft 52 has a diameter smaller than that of the head 51, one end of which is connected to the head 51, and the other end of which extends longitudinally. The shaft 52 has a helical thread. The shaft 52 has a penetration portion 52a that penetrates the interior material 2, the insulation material 3, and the base material 4, and a protrusion 52b that protrudes from the base material 4 into the ceiling space 122. The protrusion length of the protrusion 52b is preferably, for example, 10 mm to 100 mm. If the protrusion length of the protrusion 52b is 10 mm or more, the interior material 2, the insulation material 3, and the base material 4 can be stably fixed. Due to the restrictions imposed by the standard for the screw 5 used in this structure, the protrusion length of the protrusion 52b is preferably 100 mm or less. Furthermore, if the protrusion length of the protrusion 52b is 100 mm or less, it does not get in the way in the ceiling space 122.

[0030] Because the screws 5 are made of metal, they easily conduct heat and act as a thermal bridge. Therefore, in summer, when the air-conditioning temperature of the indoor space 21 is low, the surface temperature of the protruding parts 52b of the screws 5 protruding into the attic space 22 becomes lower than the surface temperature of the insulating material 3 in the attic space 22. This makes it easier for condensation to form on the protruding parts 52b of the screws 5.

[0031] As a result of extensive research, the inventors discovered that if the protruding length of the protruding portion 52b of the screw 5 is increased, the surface of the protruding portion 52b will be warmed by the warm air in the attic space 22, making it less likely for condensation to form on the protruding portion 52b of the screw 5. For this reason, they devised an interior construction method in which the length of the protruding portion 52b of the screw 5 is selected depending on the minimum set temperature of the indoor space 21.

[0032] Specifically, as shown in FIG. 2(A), when the minimum set temperature of the indoor space 21 is high, the protrusion length of the protrusion 52b of the screw 5 is shortened to L1. On the other hand, as shown in FIG. 2(B), when the minimum set temperature of the indoor space 21 is low, the protrusion length of the protrusion 52b of the screw 5A is lengthened to L2. When the minimum set temperature of the indoor space 21 is low in summer, the temperature difference with the attic space 22 increases, making it easier for condensation to form on the protrusion 52b of the screw 5. Therefore, by lengthening the protrusion length of the protrusion 52b of the screw 5, the warm air in the attic space 22 can warm the surface of the protrusion of the screw 5, making it less likely for condensation to form on the protrusion of the screw.

[0033] In the interior construction method of this embodiment, the protrusion length of the protrusion 52b of the screw 5 is selected according to the minimum set temperature of the indoor space 21. That is, if the minimum set temperature of the indoor space 21 is high, a screw 5 with a short protrusion length of the protrusion 52b is selected, and if the minimum set temperature of the indoor space 21 is low, a screw 5A with a long protrusion length of the protrusion 52b is selected. Therefore, since it is only necessary to select the length of the screw 5 according to the minimum set temperature of the indoor space 21, condensation prevention can be achieved at the minimum necessary cost. Furthermore, by further considering the thermal resistance of the insulation material 3 when selecting the screws 5, 5A, condensation in the concealed area can be more optimally suppressed.

[0034] In the interior construction method of this embodiment, the protrusion length of the protrusion 52b of the screw 5 is selected to match the minimum set temperature of the indoor space 21, but insulating materials with different thermal resistances may also be selected to match the protrusion length of the protrusion 52b of the screw 5. Specifically, for insulating materials with high thermal resistance, screws 5 with short protrusion lengths of the protrusions 52b may be selected, and for insulating materials with low thermal resistance, screws 5A with long protrusion lengths of the protrusions 52b may be selected. In this case, by further considering the minimum set temperature of the indoor space 21, condensation can be suppressed more optimally.

[0035] <How to calculate the protruding length of the screw> Next, a method for calculating the screw protrusion length for the minimum temperature setting in the indoor space will be described.

[0036] The screw protrusion length was calculated based on values ​​calculated by CFD (fluid dynamics) analysis. Figure 3(A) shows an analytical model simulating an air-conditioned indoor space, and Figures 3(B) and (C) are enlarged views of a portion of Figure 3(A). As shown in these figures, the space on the left side of the page is indoor space 221, and the space on the right side is attic space 222. Indoor space 221 and attic space 222 are separated by interior structure 210. In indoor space 221, as indicated by the arrow, wind blows from air generation panel 214 to air intake panel 215 at a speed of 0.1 m / s, reproducing the air temperature of the indoor space. Furthermore, in attic space 222, as indicated by the arrow, wind blows from air generation panel 216 to air intake panel 217 at a speed of 0.1 m / s, reproducing the air temperature of the attic space.

[0037] The screws 250, interior material 202, heat insulating material 203, and base material 204 were modeled as shown in Figures 3(B) and (C), and were reproduced by setting them to typical thermal conductivity and thickness. Screws 251 were used, for example, screws with a diameter of about 4 mm, such as 3.5 mm or 4.2 mm. In particular, various shapes are used for the base material 204, but in this analysis, a single ceiling joist (depth W: 25 mm, height H: 19 mm) with a small surface area and low heat dissipation effect was used.

[0038] Specifically, in interior structure 210, interior material 202 is arranged on the indoor space 221 side, insulation material 203 is arranged on the attic space 222 side, and base material 204 is provided in contact with insulation material 203. Screw 251 penetrates interior material 202, insulation material 203, and base material 204 in this order from the indoor space 221 side toward attic space 222, and protrudes toward attic space 222. Screw 251 is composed of head 251 and shank 252, and the portion of shank 252 that penetrates interior material 202, insulation material 203, and base material 204 is penetration portion 252a, and the portion that protrudes from base material 204 is protrusion 252b.

[0039] First, to calculate the required protrusion length of the screw, we calculated the relationship with the minimum temperature setting for the indoor space. Figure 4 is a table showing the relationship between the temperature setting for the indoor space and the surface temperature of the protrusion of the metal screw.

[0040] As shown in Figure 4, the temperature of the ceiling space is set to 28°C and the thermal resistance of the insulation is set to 1.0 m 2 K / W, the protruding length of the screw was fixed at 10 mm, and the surface temperature of the protruding part of the screw was estimated when the minimum set temperature of the indoor space was changed from 10°C to 20°C in 1°C increments.

[0041] In a typical non-residential building, it is known that chronic condensation will not occur if the surface temperature exceeds 25°C in the summer when the outdoor temperature is 28°C and the outdoor dew point is 25°C. Therefore, if the surface temperature of the screw protrusion is 25°C or higher, condensation will not occur, and a "Yes" is indicated. If it is below 25°C, condensation will occur, and a "No" is indicated. If the minimum temperature setting for the indoor space is 14°C or higher, the surface temperature of the screw protrusion will be 25.1°C or higher, which is higher than the dew point of 25°C, so condensation will not occur on the screw protrusion. On the other hand, if the minimum temperature setting for the indoor space is between 10°C and 13°C, the surface temperature of the screw protrusion will be 24.8°C or lower, which is lower than the dew point of 25°C, so condensation will occur on the screw protrusion.

[0042] The minimum temperature settings for indoor spaces where condensation is determined to occur on the protruding parts of screws under the above conditions are 10°C, 11°C, 12°C, and 14°C. Of these, we calculated how long the protruding length of the screws needs to be to prevent condensation from occurring on the surface of the protruding parts of the screws, particularly when the minimum temperature setting for indoor spaces is 12°C.

[0043] Figure 5 is a table showing the relationship between the protrusion length of a metal screw and the surface temperature when the minimum temperature setting is 12°C. As shown in Figure 5, when the protrusion length of the screw is 10 mm, the surface temperature of the screw protrusion is 24.62°C. When the protrusion length of the screw is 20 mm, the surface temperature of the screw protrusion is 24.82°C. Since this is lower than the dew point temperature of 25°C, it was determined that condensation would occur on the screw protrusion. On the other hand, when the protrusion length of the screw is 30 mm, the surface temperature of the screw protrusion is 25.02°C. Since this is higher than the dew point temperature of 25°C, it was determined that condensation would not occur on the screw protrusion. As such, it was found that even when the minimum temperature setting of an indoor space is set low, such as below 12°C, condensation can be prevented by increasing the protrusion length of the screw protrusion.

[0044] Similarly, the relationship between the thermal resistance of the insulation material and the protruding length of the screw protrusion was calculated with the minimum temperature setting in the indoor space kept constant.

[0045] Figure 6 shows the case where the minimum temperature setting for the indoor space is 13°C. Three points were plotted, and an approximate line was calculated from these three points. This approximate line is a line with a margin to prevent condensation from occurring, and the equation for the approximate line is y = -20x + 40. Furthermore, the thermal resistance of the insulation material is 1.0m 2 It is preferable that the screw protrusion length is 10mm or more. When the minimum temperature setting for the indoor space is 13℃, it was found that condensation on the screws can be prevented by keeping the screw protrusion length and the thermal resistance of the insulation within the numerical range shown in light ink.

[0046] Figure 7 shows the case where the minimum temperature setting for the indoor space is 12°C. Four points were plotted and an approximate straight line was calculated from these four points. The equation for the approximate straight line is y = -21x + 50. As with the case where the minimum temperature setting is 13°C (Figure 6), when the minimum temperature setting for the indoor space is 12°C, it was found that condensation on the screws can be prevented by keeping the protruding length of the screw protrusions and the thermal resistance of the insulation within the numerical ranges shown in light ink.

[0047] Figure 8 shows the case where the minimum temperature setting for the indoor space is 11°C. Five points were plotted and an approximate straight line was calculated from these five points. The equation for the approximate straight line is y = -44x + 105. As with the case where the minimum temperature setting is 13°C (Figure 6), when the minimum temperature setting for the indoor space is 11°C, it was found that condensation on the screws can be prevented by keeping the protruding length of the screw protrusions and the thermal resistance of the insulation within the numerical ranges shown in light ink.

[0048] Figure 9 shows the case where the minimum temperature setting for the indoor space is 10°C. Five points were plotted and an approximate straight line was calculated from these five points. The equation for the approximate straight line is y = -68x + 180. As with the case where the minimum temperature setting is 13°C (Figure 6), when the minimum temperature setting for the indoor space is 10°C, it was found that condensation on the screws can be prevented by keeping the protruding length of the screw protrusions and the thermal resistance of the insulation within the numerical range shown in light ink.

[0049] This shows that if the minimum temperature setting for the indoor space is 14°C or higher, condensation on the screws can be prevented by setting the protruding length of the screw protrusion to 10mm. Furthermore, if the minimum temperature setting for the indoor space is 13°C, 12°C, 11°C, or 10°C, condensation on the screws can be prevented by setting the numerical range (protruding length of the screw protrusion and thermal resistance of the insulation) within the light-shaded ranges in the graphs shown in Figures 6 to 9. [Explanation of symbols]

[0050] 2 Interior material, 3 Heat insulating material, 4 Base material, 5, 5A Metal screws, 21 Indoor space, 22 Ceiling space (concealed part), 52 Shaft part, 52a Penetration part, 52b Protrusion part.

Claims

1. In an interior construction method to suppress condensation in the concealed area between the indoor and outdoor spaces, the concealing portion includes an interior material whose surface faces the indoor space, a heat insulating material superimposed on the back side of the interior material, a base material positioned on the heat insulating material, and a metal screw that penetrates the interior material, the heat insulating material, and the base material and protrudes from the base material toward the concealing portion, The interior construction method is as follows: a step of preparing, as the metal screws, a first metal screw having a short protruding length protruding from the base material toward the concealing portion, and a second metal screw having a long protruding length protruding from the base material toward the concealing portion; selecting the first metal screw when the minimum set temperature of the indoor space is set to a relatively high T1; and selecting the second metal screw when the minimum set temperature of the indoor space is set to a relatively low T2.

2. 2. The interior construction method according to claim 1, wherein the thermal resistance of the insulating material is further taken into consideration when selecting the most suitable metal screw from among a plurality of types of metal screws having different protruding lengths from the base material toward the concealed portion.

3. In an interior construction method to suppress condensation in the concealed area between the indoor and outdoor spaces, the concealing portion includes an interior material whose surface faces the indoor space, a heat insulating material superimposed on the back side of the interior material, a base material positioned on the heat insulating material, and a metal screw that penetrates the interior material, the heat insulating material, and the base material and protrudes from the base material toward the concealing portion, The interior construction method is as follows: a step of preparing, as the metal screws, a first metal screw having a short protruding length protruding from the base material toward the concealing portion, and a second metal screw having a long protruding length protruding from the base material toward the concealing portion; selecting the first metal screw when the thermal resistance of the insulating material is set to a relatively high value R1; and selecting the second metal screw when the thermal resistance of the insulating material is set to a relatively low value R2.

4. The interior construction method according to any one of claims 1 to 3, wherein the protruding length of the metal screw is 10 mm or more and 100 mm or less.

5. The thermal resistance of the insulating material is 1.0 m ２ The interior construction method according to any one of claims 1 to 4, wherein the tensile strength is 1000 kJ / W or more.

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