Interior structure and construction method

Abstract

To provide an interior structure and interior construction method that can suppress condensation in concealed areas between indoor and outdoor spaces with a simple configuration.SOLUTION: An interior structure (10) is for controlling condensation in a concealed area (22) between the indoor space (21) and the outdoor space. The interior structure (10) comprises: an interior material (2) whose surface faces the interior space (21); a heat insulating material (3) overlapped on the back side of the interior material (2); a base material (4) located on a heat insulation material (3); and a metal screw (5) penetrating the interior material (2); heat insulation material (3), and base material (4). The insulation material (3) has a moisture permeability resistance of 0.0069 [(m2*s*Pa) / ng] or higher.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an interior structure and 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 structure and 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 structure according to one aspect of the present invention is an interior structure for suppressing condensation in a concealed portion between an indoor space and an outdoor space, and includes an interior material having a surface facing 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 metal screws penetrating the interior material, the heat insulating material, and the base material, and the heat insulating material has a moisture vapor resistance of 0.0069[(m 2 ·s·Pa) / ng or more.

[0008] Preferably, the insulation has a thermal resistance of 1.0 m 2 It is about K / W.

[0009] Preferably, the heat insulating material is at least one selected from polyethylene foam and phenol foam.

[0010] An interior structure according to another aspect of the present invention is an interior structure for suppressing condensation in a concealed area between an indoor space and an outdoor space, and 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, metal screws that penetrate the interior material, the insulating material, and the base material, and other insulating material that covers the protruding portions of the metal screws that protrude from the base material.

[0011] Preferably, a moisture-proof sheet is further provided between the heat insulating material and the base material.

[0012] According to another aspect of the present invention, an interior construction method for selecting an interior structure for suppressing condensation in a concealed portion between an indoor space and an outdoor space includes an interior material having a surface facing 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 metal screws penetrating the interior material, the heat insulating material, and the base material, and the heat insulating material has a moisture vapor resistance of 0.0069[(m 2A first interior structure having a moisture-proof sheet attached between the insulation and the base material in addition to the first interior structure, and a third interior structure in which the protruding portions of metal screws from the base material are covered with a second insulation material in addition to the second interior structure are planned, and when the set temperature of the indoor space is 20°C or higher but less than 25°C, the first interior structure is selected, when the set temperature of the indoor space is 15°C or higher but less than 20°C, the second interior structure is selected, and when the set temperature of the indoor space is 10°C or higher but less than 15°C, the third interior structure is selected. [Effects of the Invention]

[0013] According to the interior structure and interior construction method of the present invention, it is possible to suppress condensation in the concealed area between the indoor space and the outdoor space with a simple configuration. [Brief explanation of the drawings]

[0014] [Figure 1] 1A and 1B are diagrams showing a building equipped with an interior structure according to the first embodiment, in which (A) is a vertical cross-sectional view and (B) is a bottom view seen from the arrow II in FIG. 1A. [Figure 2] FIG. 1 is a perspective view of an interior structure according to the first embodiment, viewed from the ceiling space side. [Figure 3] 1 is a cross-sectional view that schematically shows a part of an interior structure according to the first embodiment. [Figure 4] FIG. 10 is a cross-sectional view that schematically shows a part of an interior structure according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a cross-sectional view that schematically shows a part of an interior structure according to a third embodiment of the present invention. [Figure 6] 10 is a diagram schematically showing a part of an interior structure according to a third embodiment, and is a cross-sectional view taken along the longitudinal direction of the base material shown in FIG. 2. FIG. [Figure 7] 7A is an end view taken along line VIIa in FIG. 6, and FIG. 7B is an end view taken along line VIIb in FIG. [Figure 8] FIG. 1 is a schematic cross-sectional view showing a typical building. [Figure 9]FIG. 9 is a schematic cross-sectional view showing an enlarged portion of FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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.

[0016] First, prior to describing the interior structure according to this embodiment, condensation that occurs in summer in general non-residential buildings such as factories, warehouses, temporary facilities, and laboratories will be briefly described with reference to FIGS. 8 and 9.

[0017] Referring to FIG. 8, 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-the-ceiling space 122 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 screws.

[0018] 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 to prevent condensation. If the performance of the heat insulating materials is poor, the temperature in the attic space 122 will drop below the dew point temperature, and condensation C1 will occur on the attic space 122 side of the ceiling material 112. Furthermore, the temperature in the wall back space 123 will also drop below the dew point temperature, and condensation C2 will occur on the wall back space 123 side of the interior wall 113.

[0019] The effects of such condensation C1 and C2 cause mold to grow on the interior materials that make up the ceiling material 112 and the interior wall 113. In summer, in buildings where the set temperature of the indoor space 121 is lower than the normal set temperature (for example, about 25°C), condensation water causes mold to grow on the interior materials, so mold prevention measures are necessary in concealed areas. Furthermore, as a result of extensive research, the inventors of this application have found that when mold grows on the interior materials, rust also forms on the screws that secure the interior materials to the light steel base material.

[0020] 9, metal screws 105 are used to fasten interior material 102, such as gypsum board, to light steel base material 104. Metal screws 105 include penetration portions 105a that penetrate interior material 102 and base material 104, and protrusion portions 105b that protrude from base material 104 into attic space 122. The inventors of the present application have focused on the occurrence of rust particularly at penetration portions 105a of screws 105, and have considered the cause of rust occurring in screw parts.

[0021] As a result of extensive research, the inventors have discovered the following three causes for rust formation at the penetration portion 105a of the screw 105. First, as indicated by arrow F1, condensation C3 occurs on the protruding portion 105b of the screw 105, and the condensed water penetrates the interior material 102 through the penetration hole in the interior material 102 (first cause: condensation on the screw). Second, as indicated by arrow F2, moisture in the attic space 122 penetrates the interior material 102, causing condensation C4 at the penetration portion 105a of the screw 105 (second cause: condensation on the interior material due to moisture penetration). Third, as indicated by arrow F3, condensation C5 occurs on the surface of the interior material 102 facing the attic space 122, and the condensed water penetrates the interior material 102 and reaches the penetration portion 105a of the screw 105 (third cause: condensation on the surface of the interior material).

[0022] To prevent rust on the screws 105 caused by these three factors, this embodiment places a heat insulating material between the interior material and the base material, and also focuses on the moisture permeability resistance of the heat insulating material, thereby suppressing rust on the screws. This interior structure 10 will be described in detail below.

[0023] <About the overview> 1(A) and 1(B), an overview of a building 1 in which a ceiling structure 10 according to this embodiment is provided will be described. 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.

[0024] 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.

[0025] 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." 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.

[0026] Prior to describing the ceiling structure 10 according to this embodiment, a ceiling underlayment material that supports the ceiling structure 10 will be described with further reference to FIG.

[0027] In this embodiment, the ceiling structure 10 is attached to a ceiling substrate. The ceiling substrate includes a plurality of first rod-shaped members 70 and a plurality of second rod-shaped members 4 that extend in a predetermined direction and are spaced apart from one another. The plurality of second rod-shaped members 4 are, for example, suspended and connected to beams 17 via the first rod-shaped members 70. The plurality of first rod-shaped members 70 extend, for example, in the same first direction as the beams 17, and are spaced apart in a second direction perpendicular to the first direction. In this case, the second rod-shaped members 4 extend in the second direction and are spaced apart in the first direction.

[0028] As shown in FIG. 2, the first rod-shaped member 70 is a so-called joist support, and is an elongated member formed in a horizontal U-shape (an inverted U-shape) when viewed from a first direction. The first rod-shaped member 70 is formed, for example, from a metal material. The first rod-shaped member 70 is supported by a hanger 72 suspended by a suspension bolt 71 fixed to a flange of the beam 17. Note that the first rod-shaped member 70 may have any cross-sectional shape as long as it is an elongated member, and may have, for example, a solid rectangular or circular shape.

[0029] The second rod-shaped member 4 is a so-called rough joist, and is a long member formed in a U-shape (an upward-facing C-shape) when viewed from the second direction. The second rod-shaped member 4 is formed, for example, from a metal material. The second rod-shaped member 4 is preferably made, for example, of light-gauge steel (LGS) base material. The second rod-shaped member 4 is supported by a clip 73 (shown by a dashed line in FIG. 7(A)) suspended from the first rod-shaped member 70. In the following description, the second rod-shaped member 4 will be simply referred to as the "base material."

[0030] In this embodiment, the base material 4 is hung from the first rod-shaped member 70 via the clip 73, but the base material 4 may be attached directly to the first rod-shaped member 70 and hung from the first rod-shaped member 70. Also, if the first rod-shaped member 70 is not provided, the base material 4 may be attached directly to a beam 17 or the like. In other words, the above-described ceiling structure 10 is an example of this embodiment.

[0031] <About the ceiling structure (interior structure)> Next, a description will be given of a ceiling structure 10 according to this embodiment. Referring to Fig. 3, 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 the above.

[0032] 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. 3) faces the indoor space 21, and its back surface (the top surface in FIG. 3) 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.

[0033] 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.

[0034] Insulation material 3 has a thermal resistance of 1.0 m 2 K / W, 0.8m 2 K / W or more 1.2m 2 It is preferable that the thermal resistance is 0.8m 2 K / W or more 1.2m 2If the thickness is 30 mm or less, condensation in the concealed area can be suppressed. The thickness of the insulating material 3 is preferably 30 mm or less. If the thickness is 30 mm or less, condensation in the concealed area can be suppressed. In addition, insulating materials with a thickness of 30 mm are widely available on the market, and have the advantage of being easy to obtain. Furthermore, if the thickness is 30 mm or less, the indoor space 21 will not become narrower. The moisture permeation resistance of the insulating material is calculated by multiplying the moisture permeation resistivity by the thickness. The insulating material 3 has, for example, a rectangular shape in a plan view, and is preferably formed by combining multiple sheets and overlapping them over the entire surface of the interior material 2, but it may also be formed into a long strip and provided only in the area that overlaps with the base material 4.

[0035] 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 shank 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. After the screw 5 is screwed in, the head 51 also serves as a retaining part for preventing it from coming loose from the base material 4.

[0036] Shank 52 has a smaller diameter than head 51, one end connected to head 51, and the other end extending in the longitudinal direction. Shank 52 may be provided with a helical thread. Shank 52 has penetration portion 52a that penetrates interior material 2, insulation material 3, and base material 4, and protrusion 52b that protrudes from these into attic space 122. The dimension of protrusion 52b is preferably, for example, about 10 mm.

[0037] 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.

[0038] If the set temperature of the indoor space 21 is between 20°C and 25°C, the set temperature is not so low. Therefore, the temperature of the screw 5 is unlikely to drop, and the risk of condensation on the protruding portion 52b of the screw 5 is low. 2 By using a thermal insulation material 3 with a thermal insulation resistance of at least [MPa], it is possible to prevent condensation from forming inside the thermal insulation material 3. Furthermore, it is possible to make it difficult for moisture from the attic space 22 to reach the interior material 2, thereby preventing condensation from occurring at the interface with the interior material 2.

[0039] <Embodiment 2> 4 is a diagram schematically illustrating a ceiling structure 10A according to embodiment 2 of the present invention. This embodiment differs from the above embodiment in the moisture-proof sheet 6.

[0040] The moisture-proof sheet 6 is provided between the heat insulating material 3 and the base material 4. In other words, the moisture-proof sheet 6 is provided on the surface side of the attic space 22. The moisture-proof sheet 6 is preferably made of an aluminum material such as aluminum hydroxide paper or aluminum foil. The moisture-proof sheet 6 may be provided in multiple layers rather than in a single layer. The moisture-proof sheet 6 is preferably rectangular in plan view and is preferably overlapped over the entire surface of the heat insulating material 3 without any gaps. A configuration using the moisture-proof sheet 6 is preferably used when the set temperature of the indoor space 21 is 15°C or higher and lower than 20°C.

[0041] The set temperature of the indoor space 21 is slightly low when it is between 15°C and 20°C. Therefore, the internal temperature of the screw 5 is low, and the moisture permeability resistance is 0.0069[(m 2 If the insulation material 3 has only a thermal insulation resistance of [MPa] or more, moisture that penetrates the insulation material 3 may cause condensation inside the insulation material 3. Therefore, by providing a moisture-proof sheet 6 on the attic space 22 side of the insulation material 3, it is possible to prevent moisture from penetrating into the insulation material 3 from the attic space 22 side. Furthermore, it is possible to make it difficult for moisture from the attic space 22 to reach the interior material 2, thereby preventing condensation from occurring at the interface with the interior material 2.

[0042] <Third Embodiment> Figure 5 is a diagram showing a schematic diagram of a ceiling structure 10B according to embodiment 3 of the present invention. This embodiment differs from embodiment 2 above in that in addition to the insulating material 3, an insulating material 7 different from the insulating material 3 is used. In the following description, in order to differentiate the newly used insulating material, the above-mentioned insulating material will be referred to as the first insulating material 3, and the new insulating material will be referred to as the second insulating material 7.

[0043] The second insulating material 7 is provided to cover the protruding portions 52b of the screws 5. The second insulating material 7 is preferably made of a material that does not allow moisture or water to pass through, such as polyethylene foam with a closed-cell structure, and is elastic. The second insulating material 7 is an elongated member that is rectangular in cross section, but since it is only necessary to cover the protruding portions 52b of the screws 5, it does not have to be elongated and may be, for example, cubic or spherical.

[0044] The thickness of the second insulating material 7 is preferably, for example, about 15 mm. This is because the dimension of the protruding portion 52b of the screw 5 is usually about 10 mm, and therefore the thickness is preferably sufficient to cover the protruding portion 52b. A configuration using the second insulating material 7 is preferably used when the set temperature of the indoor space 21 is 10°C or higher and lower than 15°C. Note that, although a moisture-proof sheet 6 is used between the base material 4 and the insulating material 3 in this embodiment, the moisture-proof sheet 6 does not necessarily have to be used.

[0045] Furthermore, by incorporating the second insulating material 7 into the base material 4, construction can be simplified. A method of incorporating the second insulating material 7 into the base material 4 will be described with reference to Figures 2, 6, and 7. Figure 2 is a perspective view of the interior structure according to the first embodiment as seen from the ceiling space side, Figure 6 is a cross-sectional view along the longitudinal direction of the base material 4 shown in Figure 2, Figure 7(A) is an end view along line VIIa in Figure 6, and Figure 7(B) is an end view along line VIIb in Figure 6.

[0046] As described above, the second insulating material 7 is a long, elongated member extending in the longitudinal direction, and is fixed by having both ends sandwiched between the base material 4 and the joints 75 that connect the base materials 4.

[0047] 7(A), the base material 4 has a hollow shape, and in a cross section perpendicular to the longitudinal direction, includes a bottom wall 41, a pair of side walls 42 rising upward from both ends of the bottom wall 41, a pair of upper walls 43 protruding inward from the upper ends of the pair of side walls 42, and flange portions 44 protruding downward from the inner ends of the pair of upper walls 43. The base material 4 shown in FIGS. 3 to 5 is a simplified version of the base material 4 in FIGS. 7(A) and 7(B).

[0048] The second insulating material 7 is preferably in the same shape as the interior of the base material 4, i.e., an elongated shape with a rectangular cross section, so that it can be inserted into the space formed by the bottom wall 41 and the pair of side walls 42 of the base material 4. As shown in Fig. 7(B), the vertical dimension of the second insulating material 7 is preferably smaller than the vertical dimension of the side walls 42 of the base material 4.

[0049] As shown in FIG. 2, the joint 75 is used to connect two base materials 4. As shown in FIG. 7(A) in particular, the joint 75 is formed in a U-shape (an upwardly pointing U-shape) when viewed from the second direction. Specifically, the joint 75 includes a bottom portion 75a and a pair of side portions 75b rising upward from both ends of the bottom portion 75a. The joint 75 is also formed, for example, from a metal material. As shown in FIG. 7(A), the joint 75 is preferably sized to fit within the base material 45. Specifically, the bottom portion 75a of the joint 75 is sized to correspond to the bottom wall 41 of the base material 4, and the vertical dimension of the side portion 75b of the joint 75 is preferably smaller than the vertical dimension of the side wall 42 of the base material 4.

[0050] When assembling the base, the second insulating material 7 is inserted inside the base material 4, and the base materials 4 with the second insulating material 7 inserted are joined together with joints 75. Specifically, multiple base materials 4 and second insulating materials 7 of the same length are prepared, and the second insulating material 7 is inserted inside the base material 4. One end and the other end in the longitudinal direction are aligned opposite each other, and the joints 75 are pushed into the base material 4. During this process, the longitudinal ends of the second insulating material 7 are compressed.

[0051] This allows both longitudinal ends of the second insulating material 7 to be compressed and fixed with the joints 75, making the second insulating material 7 less likely to float, even in the longitudinal center. As a result, the bottom of the second insulating material 7 comes into contact with the bottom wall 41 of the base material 4, making it easier to insert the screws 5 into the second insulating material 7. Furthermore, even if the second insulating material 7 does float slightly, moisture can be prevented from entering because both longitudinal ends are compressed and fixed.

[0052] In addition, the interior structure of this embodiment is based on a general base construction method, so it can be constructed using ordinary interior construction work. Therefore, compared to the construction of special insulation panels, it is possible to shorten the construction period. Furthermore, since no special materials are required, construction is easy.

[0053] The longitudinal length of the base material 4 is limited from the viewpoint of transportation and installation. For this reason, it is common to connect base materials 4 together with joints 75. Since the second insulating material 7 can be fixed using commonly used joints 75, installation is easy.

[0054] When the set temperature of the indoor space 21 is between 10°C and 15°C, the set temperature is quite low. Therefore, the temperature inside the protruding portion 52b of the screw 5 also becomes low, and the moisture permeability resistance is 0.0069[(m 2 Condensation may occur with only the insulation 3 having a thermal insulation resistance of [°C / s·Pa] or more and the moisture-proof sheet 6. Therefore, by providing a second insulation material 7 on the protruding portion 52b of the screw 5, it is possible to prevent condensation from occurring on the screw 5. Furthermore, it is possible to make it difficult for moisture from the attic space 22 to reach the interior material 2, thereby preventing condensation from occurring at the interface with the interior material 2. This makes it possible to prevent condensation on the screw 5 even at low temperatures, such as between 10°C and 15°C.

[0055] <Interior construction method> Next, we will explain an interior construction method using the ceiling structures 10 to 10B of the above-mentioned embodiments 1 to 3. In the following explanation, for ease of understanding, the ceiling structure 10 of embodiment 1 (Fig. 3) will be referred to as the first interior structure 10, the ceiling structure 10A of embodiment 2 (Fig. 4) will be referred to as the second interior structure 10B, and the ceiling structure 10B of embodiment 3 (Fig. 5) will be referred to as the third interior structure 10B.

[0056] The interior construction method involves planning three types of interior structure in advance, namely, first interior structure 10, second interior structure 10A, and second interior structure 10B, and selecting the one that matches the set temperature of indoor space 21.

[0057] In general buildings such as factories, warehouses, and temporary facilities, the set temperature of the indoor space 21 in summer is determined depending on the purpose of the building. When the set temperature of the indoor space 21 is between 20°C and 25°C, the temperature is not so low, and the temperature of the screws 5 does not become extremely low. Therefore, when the set temperature of the indoor space is between 20°C and 25°C, the moisture vapor resistance of the heat insulating material 3 is 0.0069[(m 2 ·s·Pa) / ng or higher.

[0058] When the set temperature of the indoor space 21 is between 15°C and 20°C, the temperature is low to some extent, and the surface temperature of the screws 5 may be low, so some consideration is required. Therefore, when the set temperature of the indoor space 21 is between 15°C and 20°C, the moisture permeability resistance of the heat insulating material 3 is 0.0069[(m 2 ·s·Pa) / ng] or more and using a moisture-proof film 6 is selected.

[0059] When the set temperature of the indoor space 21 is between 10°C and 15°C, the temperature is so low that not only the surface temperature of the screws 5 but also the internal temperature drops, and sufficient measures against condensation are required. Therefore, when the set temperature of the indoor space 21 is between 10°C and 15°C, the moisture permeability resistance of the heat insulating material 3 is 0.0069[(m 2 ·s·Pa) / ng] or more, a moisture-proof film 6 is used, and a third interior structure equipped with a second heat insulating material 7 is selected.

[0060] In this embodiment, the interior structures 10, 10A, and 10B are determined in stages for each temperature zone to match the set temperature of the indoor space 21. Therefore, it is possible to select the interior structures 10, 10A, and 10B that have the optimal anti-condensation measures for the temperature zone, and therefore anti-condensation measures can be implemented at the minimum necessary cost without over-specifying. [Explanation of symbols]

[0061] 1,100 Building, 2,102 Interior materials, 3,103 Heat insulation material (first insulation material), 4,104 Base material (second rod-shaped member), 5,105 Metal screws, 6 Moisture-proof sheet, 7 Second insulation material, 10, 10A, 10B Ceiling structure (interior structure), 30 Interior wall structure, 21,121 Indoor space, 22,122 Attic space, 23,123 Back wall space, 52a, 105a Penetration part, 52b, 105b Protrusion part.

Claims

1. An interior structure for suppressing condensation in a concealed portion between an indoor space and an outdoor space, an interior material whose surface faces the indoor space; a heat insulating material superimposed on the rear surface side of the interior material; A base material positioned on the heat insulating material; a metal screw that penetrates the interior material, the heat insulating material, and the base material; An interior structure comprising another insulating material that covers the protruding portion of the metal screw that protrudes from the base material.

2. The heat insulating material has a thermal resistance of 1.0 m ２ The interior structure according to claim 1, which is K / W.

3. 3. The interior structure according to claim 1, wherein the heat insulating material is at least one selected from the group consisting of polystyrene foam and phenolic foam.

4. The interior structure according to any one of claims 1 to 3, further comprising a moisture-proof sheet between the heat insulating material and the base material.

5. In an interior construction method for selecting an interior structure to suppress condensation in the concealed area between the indoor and outdoor spaces, a first interior structure including 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 metal screws penetrating the interior material, the heat insulating material, and the base material, wherein the heat insulating material has a moisture vapor transmission resistance of 0.0069 [(m2·s·Pa) / ng] or more; a second interior structure in which a moisture-proof sheet is attached between the heat insulating material and the base material in addition to the first interior structure; In addition to the second interior structure, a third interior structure is planned in which the protruding portion of the metal screw protruding from the base material is covered with a second heat insulating material, When the set temperature of the indoor space is 20°C or higher and lower than 25°C, the first interior structure is selected; When the set temperature of the indoor space is 15°C or higher but lower than 20°C, the second interior structure is selected; An interior construction method in which the third interior structure is selected when the set temperature of the indoor space is 10°C or higher but lower than 15°C.

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