Underfloor insulation structure and its construction method

Abstract

To improve underfloor space heat insulation through simple construction.SOLUTION: An underfloor insulation structure 9 includes a cloth foundation 1, a heat insulating material 2, an earthen floor concrete layer 3, and a heat insulating and moisture-proof sheet 4. The cloth foundation 1 has a rising part 15 surrounding the underfloor space S1. The heat insulating material 2 is arranged along the inner surface 152 of the rising part 15. The earthen floor concrete layer 3 is provided in the underfloor space S1. The heat-insulating and moisture-proof sheet 4 is placed below the earthen floor concrete layer 3 along the earthen floor concrete layer 3. The heat-insulating moisture-proof sheet 4 includes a moisture-proof sheet 41 and a heat-insulating sheet 43 laminated on the moisture-proof sheet 41.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an underfloor insulation structure and a construction method thereof. [Background technology]

[0002] In underfloor insulation structures, in order to improve the insulation of the underfloor space surrounded by the strip foundation, it has been customary to place panel-shaped insulation material on the inner surface of the strip foundation, as well as to place panel-shaped insulation material on top of the concrete floor layer installed in the internal space (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-249634 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional technology described above, when floor beams for supporting floor panels are installed on top of the concrete floor layer, restrictions are imposed on the installation of the insulation and floor beams to avoid interference between the insulation and the floor beams on top of the concrete floor layer.

[0005] For example, when it is necessary to install many floor beams, it is necessary to remove some of the insulation to avoid interference between the floor beams near the continuous footing and the insulation, which requires a lot of work. As such, conventional technology has a low degree of freedom in installing floor beams, making it difficult to improve insulation with simple installation.

[0006] The present disclosure aims to improve the thermal insulation of the underfloor space with simple construction. [Means for solving the problem]

[0007] The present disclosure provides an underfloor insulation structure comprising a continuous footing having a raised portion surrounding an underfloor space, a heat insulating material disposed along the inner surface of the raised portion, a concrete floor layer provided in the underfloor space, and a heat insulating and moisture proof sheet disposed below the concrete floor layer so as to be aligned with the concrete floor layer. The heat insulating and moisture proof sheet includes a moisture proof sheet and a heat insulating sheet laminated on the moisture proof sheet.

[0008] A method for constructing an underfloor insulation structure according to one aspect of the present disclosure includes the steps of: arranging insulation material along the inner surface of the rising portion of a continuous footing; laying a heat-insulating moisture-proof sheet in the underfloor space surrounded by the rising portion; and pouring a concrete floor layer on the heat-insulating moisture-proof sheet. The heat-insulating moisture-proof sheet includes a moisture-proof sheet and a heat-insulating sheet laminated on the moisture-proof sheet. [Effects of the Invention]

[0009] The underfloor insulation structure according to the present disclosure has the effect of improving the insulation properties of the underfloor space with simple construction.

[0010] The construction method for an underfloor insulation structure according to the present disclosure has the effect of improving the insulation properties of the underfloor space with simple construction. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view schematically showing an underfloor heat insulation structure according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a main part of a heat and moisture-proof sheet provided in the underfloor heat insulation structure. [Figure 3] FIG. 3 is a cross-sectional view schematically showing a first modified example of the underfloor heat insulation structure. [Figure 4] FIG. 4 is a cross-sectional view schematically showing a second modified example of the underfloor heat insulation structure. [Figure 5] FIG. 5 is a cross-sectional view schematically showing a third modified example of the underfloor heat insulation structure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Embodiments and modifications of the present disclosure will be described with reference to FIGS. 1 to 5. Note that the following embodiments and modifications are merely a portion of various embodiments of the present disclosure. The following embodiments and modifications can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Furthermore, the configurations of the modifications can be combined as appropriate.

[0013] The drawings referred to below are all schematic drawings, and the dimensional ratios of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0014] (1) Implementation form (1-1) Underfloor insulation structure FIG. 1 schematically shows an underfloor heat insulation structure 9 according to one embodiment.

[0015] In one embodiment, the underfloor insulation structure 9 constitutes the underfloor portion of a building such as a house, and comprises a continuous foundation 1, insulation material 2, a concrete floor layer 3, an insulating moisture-proof sheet 4, an anti-termite sheet 5, and floor beams 6.

[0016] (1-1-1) Strip foundation The continuous footing 1 is a perimeter foundation for supporting a building such as a house from below, and is formed in a frame shape using concrete so as to correspond to the planar shape of the building.

[0017] The continuous foundation 1 integrally comprises a footing portion 12 buried in the ground G1 and a rising portion 15 extending upward from the footing portion 12. The footing portion 12, which constitutes the lower portion of the continuous foundation 1, is wider than the rising portion 15 in the inward and outward directions.

[0018] The internal and external directions here refer to the mutually opposing directions between the underfloor space S1 and the external space S2. The underfloor space S1 is a space surrounded by the frame-shaped rising portion 15, and the external space S2 is a space located on the opposite side of the rising portion 15 from the internal space S1.

[0019] In a vertical cross section, the continuous footing 1 including the footing portion 12 and the rising portion 15 has an inverted T-shaped cross section.

[0020] (1-1-2) Heat insulation The heat insulating material 2 is arranged along the inner surface 152 of the rising portion 15 of the continuous footing 1. The inner surface 152 of the rising portion 15 is the surface of the rising portion 15 that faces the underfloor space S1. The heat insulating material 2 is arranged over almost the entire area of ​​the inner surface 152 in the vertical direction.

[0021] The heat insulating material 2 is a panel-shaped member molded from a resin material with excellent heat insulating properties. The heat insulating material 2 is fixed to the inner surface 152 of the rising portion 15, for example, via an adhesive. It is preferable that an anti-termite agent is mixed into the adhesive.

[0022] The heat insulating material 2 integrally includes a portion 23 located above the concrete floor layer 3 and a portion 25 located below the concrete floor layer 3. In the heat insulating material 2, the portion 23 above the concrete floor layer 3 and the portion 25 below the concrete floor layer 3 are formed as a single continuous piece via a portion 24 between the two portions 23, 25.

[0023] The thickness of the heat insulating material 2 in the inner and outer directions is, for example, 90 mm, and the thermal conductivity of the heat insulating material 2 is, for example, 0.028 W / mK.

[0024] (1-1-3) Concrete floor layer The concrete floor layer 3 is provided on the ground G1 of the underfloor space S1. In the underfloor space S1, the ground G1 is covered with the concrete floor layer 3.

[0025] The concrete floor layer 3 has a shape that extends horizontally. The upper surface 32 of the concrete floor layer 3 is flat. The term "flat" used in this specification is not limited to flat in the strict sense, but may refer to any surface that can be considered flat within the technical field of the present disclosure.

[0026] In one embodiment of the underfloor insulation structure 9, the peripheral portion of the concrete floor layer 3 that is close to the rising portion 15 is formed to have a greater thickness than other portions of the concrete floor layer 3. Specifically, the upper surface of the concrete floor layer 3 is flat, and the peripheral portion of the concrete floor layer 3 is formed to become thicker as it approaches the rising portion 15.

[0027] The thickness of the concrete floor layer 3 in the vertical direction excluding the peripheral edge portion is preferably within a range of, for example, 60 mm to 100 mm.

[0028] (1-1-4) Heat-insulating and moisture-proof sheet The heat insulating and moisture proof sheet 4 is laid on the ground G1 in the underfloor space S1, and the concrete floor layer 3 is provided on the heat insulating and moisture proof sheet 4.

[0029] That is, the heat insulating and moisture-proof sheet 4 is placed under the concrete floor layer 3 so as to follow the concrete floor layer 3. The heat insulating and moisture-proof sheet 4 is laid so as to be sandwiched between the concrete floor layer 3 and the ground G1 below it.

[0030] The heat insulating and moisture-proof sheet 4 is a flexible sheet, and as shown in Fig. 2, integrally includes a moisture-proof sheet 41 and a heat insulating sheet 43. In the heat insulating and moisture-proof sheet 4, the moisture-proof sheet 41 and the heat insulating sheet 43 are laminated together. The heat insulating and moisture-proof sheet 4 is laid on the ground G1 with the heat insulating sheet 43 positioned above the moisture-proof sheet 41.

[0031] Generally, when a heat insulating material is placed under the concrete floor layer 3, termite damage can become a problem, but in one embodiment of the underfloor heat insulating structure 9, a moisture-proof sheet 41 is placed under the heat insulating sheet 43, which effectively prevents termites from invading the heat insulating sheet 43. It is also preferable that the moisture-proof sheet 41 further contains an anti-termite agent.

[0032] The moisture-proof sheet 41 and the heat-insulating sheet 43 are made of different materials. The moisture-proof sheet 41 is made of, for example, polyethylene. Alternatively, the moisture-proof sheet 41 may be made of, for example, an ethylene-vinyl acetate copolymer resin.

[0033] The heat insulating sheet 43 is made of, for example, foamed polyethylene. Alternatively, the heat insulating sheet 43 may be made of, for example, glass wool, polyester resin, foamed rubber, or ethylene propylene rubber.

[0034] The thickness of the heat insulating sheet 43 in the vertical direction is, for example, 5 mm, and the thermal conductivity of the heat insulating sheet 43 is, for example, 0.04 W / mK.

[0035] In one embodiment of the underfloor insulation structure 9, the heat insulating and moisture proof sheet 4 is not laid so as to cover the entire concrete floor layer 3 from below. The heat insulating and moisture proof sheet 4 is laid only in the peripheral area of ​​the rising portion 15, and is not laid in any area other than this peripheral area.

[0036] The peripheral region of the rising portion 15 is a region within a predetermined distance D1 from the rising portion 15 in the horizontal direction. This peripheral region is a region on the inside of the rising portion 15 in the inward / outward direction.

[0037] In one embodiment of the underfloor insulation structure 9, the predetermined distance D1 is, for example, 2 m. To properly set the heat transmission coefficient between the underfloor space S1 and the external space S2, the predetermined distance D1 is preferably set to, for example, 1 m or more. Furthermore, to maintain the underfloor space S1 at an appropriate temperature by utilizing underground temperature, particularly in the summer, the predetermined distance D1 is preferably set to, for example, 4 m or less, and more specifically, 3.06 m or less.

[0038] In one embodiment of the underfloor thermal insulation structure 9, the thermal resistance of the thermal insulation and moisture-proof sheet 4 is, for example, 0.1 m 2 K / W. In particular, in summer, when it is necessary to use the underground temperature of the ground G1 to keep the underfloor space S1 at an appropriate temperature, the thermal resistance of the heat insulating and moisture-proof sheet 4 is 0.2 m2 It is preferable that the value is equal to or less than K / W.

[0039] As described above, in the underfloor heat insulation structure 9 of one embodiment, in addition to disposing the heat insulating material 2 on the inner surface 152 of the rising portion 15, a 0.1 m 2 By laying an insulating moisture-proof sheet 4 with a thermal resistance of 1000 K / W, it is possible to ensure insulation under the floor, especially in winter, while keeping the underfloor cool in summer by utilizing the underground temperature of the ground G1.

[0040] It is also preferable that a moisture-proof sheet (not shown) (i.e., a moisture-proof sheet without an insulating sheet laminated thereon) be laid between the concrete floor layer 3 and the ground G1 in the area excluding the above-mentioned surrounding area.

[0041] (1-1-5) Termite-proof sheet The anti-termite sheet 5 is provided so as to cover the lower part of the heat insulating material 2. The anti-termite sheet 5 is, for example, a resin sheet, and contains an anti-termite agent.

[0042] At least a part of the lower portion 25 of the thermal insulation material 2 is covered with a flexible anti-termite sheet 5. The anti-termite sheet 5 includes a portion 52 disposed between the thermal insulation material 2 and the continuous footing 1, and prevents termites from invading the thermal insulation material 2.

[0043] (1-1-6) Floor bundle The floor beams 6 are members that support the floor panels 8 from below, and are arranged on the upper surface 32 of the concrete floor layer 3.

[0044] The floor beam 6 has a base 61, a support 63, and a main beam 65. The base 61 forms the lower end of the floor beam 6. The base 61 is placed on the upper surface 32 of the concrete floor layer 3 and is fixed to the concrete floor layer 3 via concrete nails or the like.

[0045] The support pillar 63 is a column-shaped portion extending upward from the center of the base 61 in a plan view. The beam support 65 is supported by the support pillar 63 so as to be located above the base 61. The height of the beam support 65 is adjustable. The beam support 65 is configured to support the beams 85 of the floor panel 8 from below.

[0046] In one embodiment, the distance D2 between the floor beam 6 closest to the rising portion 15 and the rising portion 15 among the multiple floor beams 6 provided in the underfloor insulation structure 9 is shorter than the predetermined distance D1. More specifically, the distance D2 between the floor beam 6 closest to the rising portion 15 and the rising portion 15 is the horizontal distance between the base 61 of the floor beam 6 closest to the rising portion 15 and the rising portion 15.

[0047] The floor beam 6 closest to the rising portion 15 is located directly above the heat insulating and moisture proof sheet 4, with the concrete floor layer 3 in between. In other words, a part of the heat insulating and moisture proof sheet 4 is located directly below the floor beam 6 closest to the rising portion 15, with the concrete floor layer 3 in between.

[0048] (1-2) Construction method for underfloor insulation structure In one embodiment, the construction method for the underfloor insulation structure 9 includes an insulation material placement step, an insulation moisture-proof sheet laying step, a concrete construction step, and a floor beam installation step. In the construction method for the underfloor insulation structure 9 in one embodiment, as a preliminary step to each step, the continuous footing 1 has already been constructed, and an excavated portion has been formed in the part of the ground G1 that will be the underfloor portion, close to the continuous footing 1. The depth of the excavated portion is formed to become deeper as it approaches the rising portion 15.

[0049] In the insulation placement process, the insulation 2 is placed along the inner surface 152 of the rising portion 15 of the continuous footing 1, with the anti-termite sheet 5 placed so as to cover the lower portion 25 of the insulation 2. In the insulation placement process, the insulation 2 is fixed to the inner surface 152 of the rising portion 15 via an adhesive or the like.

[0050] In the heat insulating and moisture-proof sheet laying process, the heat insulating and moisture-proof sheet 4 is laid on the ground G1 in the underfloor space S1 surrounded by the rising portion 15. The heat insulating and moisture-proof sheet 4 is laid only in the peripheral area within a predetermined distance D1 (e.g., 2 m) from the rising portion 15, and is not laid in any area other than this peripheral area. The peripheral area of ​​the rising portion 15 includes the excavated portion of the ground G1. It is also preferable to lay a moisture-proof sheet (not shown) in the area other than the peripheral area of ​​the rising portion 15.

[0051] The concrete pouring process is a process of pouring the concrete floor layer 3 on top of the heat insulating moisture-proof sheet 4, and is carried out after the insulation material placement process and the heat insulating moisture-proof sheet laying process. In the concrete pouring process, concrete is poured onto the heat insulating moisture-proof sheet 4 laid on the ground G1 and the moisture-proof sheet, to form the concrete floor layer 3.

[0052] In one embodiment, concrete is poured into the excavated portion formed in the ground G1 under the floor, thereby forming the peripheral portion of the concrete floor layer 3 which is relatively thick.

[0053] The upper surface of the heat and moisture-proof sheet 4 (that is, the upper surface of the heat insulating sheet 43) preferably has water repellency for pouring concrete.

[0054] Through the above concrete pouring process, the heat insulating and moisture-proof sheet 4 is sandwiched between the ground G1 and the concrete floor layer 3. In this state, the moisture-proof sheet 41 is positioned on the ground G1, the heat insulating sheet 43 is positioned on the moisture-proof sheet 41, and the concrete floor layer 3 is positioned on the insulation sheet 43.

[0055] In the floor beam installation process, the floor beams 6 are installed on top of the concrete floor layer 3. At this time, the heat insulating and moisture proof sheet 4 is placed under the concrete floor layer 3, so the heat insulating and moisture proof sheet 4 does not interfere with the floor beams 6, and it is easy to position the floor beams 6 close to the continuous footing 1.

[0056] According to one embodiment of the construction method for the underfloor insulation structure 9, an underfloor insulation structure 9 can be provided with the above-described simple construction, which can ensure insulation under the floor in winter while keeping the underfloor cool in summer by utilizing the underground temperature of the ground G1.

[0057] (2) Variations The following describes various modified examples of the underfloor heat insulation structure 9 of one embodiment. Note that the same components as those in the first embodiment are given the same reference numerals and detailed descriptions are omitted, and components that differ from the first embodiment will be described in detail below.

[0058] (2-1) First Modification As shown in Figure 3, in the first variant of the underfloor insulation structure 9, the insulation material 2 arranged along the inner surface 152 of the rising portion 15 of the continuous footing 1 is configured to be located above the concrete floor layer 3.

[0059] In other words, the heat insulating material 2 is disposed only along the upper portion of the inner surface 152. The heat insulating material 2 does not include the portion located below the concrete floor layer 3.

[0060] In the first variant, too, a heat insulating moisture-proof sheet 4 is arranged under the concrete floor layer 3, and this heat insulating moisture-proof sheet 4 includes a moisture-proof sheet 41 and a heat insulating sheet 43 laminated on top of it, so that it is possible to improve the insulation of the space under the floor by the simple construction of pouring concrete on top of the heat insulating moisture-proof sheet 4.

[0061] (2-2) Second Modification As shown in Figure 4, in the second variant of the underfloor insulation structure 9, the insulation material 2 arranged along the inner surface 152 of the rising portion 15 of the strip footing 1 is configured to be located above the concrete floor layer 3 and does not include the portion located below the concrete floor layer 3.

[0062] Furthermore, the second variant of the underfloor insulation structure 9 includes a second insulation material 72 arranged on the upper surface 32 of the concrete floor layer 3. The second insulation material 72 is arranged along the concrete floor layer 3.

[0063] The second insulating material 72, which is in the form of a horizontal panel, is connected to the lower part of the insulating material 2, which is in the form of a vertical panel. The second insulating material 72 has a shape that extends from the lower part of the insulating material 2 in a direction away from the rising portion 15 (in other words, inward in the inward-outward direction). In a vertical cross section, the insulating material 2 and the second insulating material 72 are continuous to form an L-shaped cross section.

[0064] The distance D3 between the end face 720 of the second insulating material 72 that is located farthest from the rising portion 15 and the rising portion 15 is shorter than the predetermined distance D1. In addition, the distance D3 is shorter than the distance D2 between the rising portion 15 and the floor beam 6 that is closest to the rising portion 15 among the multiple floor beams 6. Therefore, the second insulating material 72 does not interfere with the floor beam 6.

[0065] In the second modified example, a heat insulating and moisture proof sheet 4 is also arranged under the concrete floor layer 3, and this heat insulating and moisture proof sheet 4 includes a moisture proof sheet 41 and a heat insulating sheet 43 laminated thereon.

[0066] In the second variant, the insulation of the underfloor space can be effectively improved by the simple construction of forming the concrete floor layer 3 on top of the heat-insulating and moisture-proof sheet 4, and then placing the second insulation material 72 on top of the concrete floor layer 3. Because the heat-insulating and moisture-proof sheet 4 is laid under the concrete floor layer 3, the insulation can be effectively improved without placing the second insulation material 72 over a wide area, and the second insulation material 72 does not interfere with the floor beams 6.

[0067] (2-3) Third Modification As shown in Figure 5, in the third modified example of the underfloor insulation structure, the insulation material 2 includes, in addition to the linearly connected portions 23, 24, and 25, an extension portion 27 extending from the lower portion of the upper portion 23. The extension portion 27 extends from the lower portion of the upper portion 23 in a direction away from the rising portion 15 (in other words, inward in the inward-outward direction) so as to be positioned along the upper surface 32 of the concrete floor layer 3.

[0068] In vertical cross section, the heat insulating material 2 including these portions 23, 24, 25, and 27 is formed in a T-shaped cross section.

[0069] The distance D4 between the end face 270 of the extension portion 27 that is located farthest from the rising portion 15 and the rising portion 15 is significantly shorter than the predetermined distance D1. In addition, the distance D4 is significantly shorter than the distance D2 between the rising portion 15 and the floor beam 6 that is closest to the rising portion 15 among the multiple floor beams 6. Therefore, the extension portion 27 does not interfere with the floor beam 6.

[0070] In the third modified example, a heat insulating and moisture proof sheet 4 is also arranged under the concrete floor layer 3, and this heat insulating and moisture proof sheet 4 includes a moisture proof sheet 41 and a heat insulating sheet 43 laminated thereon.

[0071] In the third variant, the insulation of the underfloor space can be effectively improved by the simple construction of forming the concrete floor layer 3 on top of the heat-insulating and moisture-proof sheet 4, and then further placing the extension portion 27 on top of the concrete floor layer 3. Because the heat-insulating and moisture-proof sheet 4 is laid under the concrete floor layer 3, the insulation can be improved without providing the extension portion 27 over a wide area, and the extension portion 27 does not interfere with the floor beams 6.

[0072] (2-4) Other Modifications Other configurations of the underfloor heat insulation structure 9 and other configurations of the construction method of the underfloor heat insulation structure 9 can also be changed in various ways depending on the design and the like.

[0073] For example, the thickness of the concrete floor layer 3 in the vertical direction may be uniform. In this case, no excavated portion is formed in the part of the ground G1 under the floor near the continuous footing 1 before the concrete is poured.

[0074] (3) Summary As explained above based on the embodiments and various modified examples, the underfloor insulation structure (9) according to the first aspect includes a continuous footing (1) having a rising portion (15) surrounding an underfloor space (S1), a heat insulating material (2) arranged along the inner surface (152) of the rising portion (15), a concrete floor layer (3) provided in the underfloor space (S1), and a heat insulating moisture-proof sheet (4) arranged below the concrete floor layer (3) so as to follow the concrete floor layer (3). The heat insulating moisture-proof sheet (4) includes a moisture-proof sheet (41) and a heat insulating sheet (43) laminated on the moisture-proof sheet (41).

[0075] According to this embodiment, the heat insulating moisture-proof sheet (4) is placed under the concrete floor layer (3), so the heat insulating moisture-proof sheet (4) does not interfere with the floor joists (6). Therefore, depending on the construction method, it is easy to place the floor joists (6) close to the continuous footing (1), and there is a high degree of freedom in installing the floor joists (6). In addition, the heat insulating moisture-proof sheet (4) includes the moisture-proof sheet (41) and the heat insulating sheet (43), so it is possible to prevent the underfloor space (S1) from becoming too humid and improve its insulation properties, and because the moisture-proof sheet (41) is located under the heat insulating sheet (43), it is possible to prevent termites from invading the heat insulating sheet (43).

[0076] In the underfloor heat insulation structure (9) according to the second embodiment, the heat insulation and moisture-proof sheet (4) is laid in the peripheral area of ​​the rising portion (15) in the first embodiment.

[0077] According to this embodiment, the insulation material (2) and the heat-insulating moisture-proof sheet (4) ensure insulation under the floor, while in summer it is possible to keep the under floor cool by utilizing the underground temperature of the ground (G1).

[0078] In the underfloor heat insulation structure (9) according to the third aspect, the thermal resistance of the heat insulation and moisture-proof sheet (4) in the first or second aspect is 0.2 m 2 K / W or less.

[0079] According to this embodiment, it is possible to ensure the insulation of the underfloor space with the heat insulating material (2) and the heat insulating moisture-proof sheet (4), and to keep the underfloor space cool in the summer by utilizing the underground temperature of the ground (G1).

[0080] A construction method for an underfloor insulation structure (9) according to a fourth aspect includes the steps of: arranging insulation material (2) along the inner surface (152) of the rising portion (15) of the continuous footing (1), laying a heat-insulating moisture-proof sheet (4) in the underfloor space (S1) surrounded by the rising portion (15), and pouring a concrete floor layer (3) on the heat-insulating moisture-proof sheet (4). The heat-insulating moisture-proof sheet (4) includes a moisture-proof sheet (41) and a heat-insulating sheet (43) laminated on the moisture-proof sheet (41).

[0081] According to this embodiment, the heat insulating moisture-proof sheet (4) is placed under the concrete floor layer (3), so the heat insulating moisture-proof sheet (4) does not interfere with the floor joists (6). Therefore, depending on the construction method, it is easy to place the floor joists (6) close to the continuous footing (1), and there is a high degree of freedom in installing the floor joists (6). In addition, the heat insulating moisture-proof sheet (4) includes the moisture-proof sheet (41) and the heat insulating sheet (43), so it is possible to prevent the underfloor space (S1) from becoming too humid and improve its insulation properties, and because the moisture-proof sheet (41) is located under the heat insulating sheet (43), it is possible to prevent termites from invading the heat insulating sheet (43). [Explanation of symbols]

[0082] 1. Strip foundation 15 Rising section 152 Inner surface 2. Insulation 3 Concrete floor layer 4. Heat-insulating and moisture-proof sheet 41 Moisture-proof sheet 43 Heat insulation sheet 9 Underfloor insulation structure S1 Underfloor space

Claims

1. a continuous foundation having a rising portion surrounding an underfloor space; a heat insulating material disposed along an inner surface of the rising portion; A concrete floor layer provided in the underfloor space; a heat insulating and moisture-proof sheet disposed under the concrete floor layer so as to follow the concrete floor layer; The heat insulating and moisture-proof sheet includes a moisture-proof sheet and a heat insulating sheet laminated on the moisture-proof sheet. Underfloor insulation structure.

2. The heat insulating and moisture-proof sheet is laid in the peripheral area of ​​the rising portion. The underfloor insulation structure of claim 1.

3. The thermal resistance of the heat insulating and moisture-proof sheet is 0.2 m ２ K / W or less, The underfloor insulation structure according to claim 1 or 2.

4. A step of placing a thermal insulating material along an inner surface of the rising portion of the continuous footing; laying a heat insulating and moisture-proof sheet in the underfloor space surrounded by the rising portion; and a step of pouring a concrete floor layer on the heat-insulating and moisture-proof sheet. The heat insulating and moisture-proof sheet includes a moisture-proof sheet and a heat insulating sheet laminated on the moisture-proof sheet. How to install underfloor insulation.

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