Attic insulation structure

Abstract

To provide a thermal insulation structure of an attic that can improve workability while ensuring thermal insulation property of the attic.SOLUTION: A thermal insulation structure 1 of an attic comprises: a beam 2; a ceiling panel 3 supported by the beam 2; an ALC panel 4 located on an upper surface 2aa of the beam 2; and a plurality of roof panels 5 attached to an upper surface 4a of the ALC panel 4 and having a sloped upper surface 5a. The plurality of roof panels 5 have: a first roof panel 5A; and a second roof panel 5B being adjacent to the first roof panel 5A and having a sloped surface lower than a sloped surface of the first roof panel 5A. The second roof panel 5B has a lower thermal conductivity than that of the first roof panel 5A.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an insulating structure for an attic. [Background technology]

[0002] A known example of a conventional thermal insulation structure for an attic space is the thermal insulation structure for a ceiling described in Patent Document 1. In the thermal insulation structure of Patent Document 1, beams supporting roof panels are covered with a thermal insulation material.

[0003] Also, as a conventional insulation structure for an attic, an insulation structure as shown in Fig. 4 is known. The insulation structure in Fig. 4 includes a beam 51, a ceiling panel 52 supported by the beam 51, an ALC panel 53 arranged on an upper surface 51a of the beam 51, an insulated roof panel 54 attached to an upper surface 53a of the ALC panel 53 and extending in one direction along the upper surface 53a of the ALC panel 53, and a thermal insulation material 55 arranged on the upper surface of the ceiling panel 52. The insulated roof panel 54 has an upper surface 54a that slopes downward toward one of the above-mentioned directions, and the thickness becomes thinner toward the above-mentioned one direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-2157 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the heat-insulating structure of Fig. 4, the thickness of the insulated roof panel 54 becomes thinner toward one of the above-mentioned directions, so it is difficult to ensure the heat-insulating performance of the thinner portion. Therefore, the insulated roof panel 54 cannot be taken into consideration as the heat-insulating structure of the attic 57, so the heat-insulating performance of the attic 57 is ensured by placing heat-insulating material 55 on the upper surface of the ceiling panel 52. Furthermore, in order to prevent condensation from forming on the beams 51, urethane foam 56 or the like is sprayed onto the beams 51. For this reason, the heat-insulating structure of Fig. 4 is not easy to install.

[0006] An object of the present invention is to provide an attic insulation structure that can improve workability while ensuring the insulation performance of the attic. [Means for solving the problem]

[0007] (1) The thermal insulation structure for the ceiling according to claim 1 comprises a beam, a ceiling panel supported by the beam, an ALC panel located on the upper surface of the beam, and a plurality of roof panels attached to the upper surface of the ALC panel and having a sloped upper surface. The plurality of roof panels include a first roof panel and a second roof panel adjacent to the first roof panel and having a sloped surface lower than the sloped surface of the first roof panel. The second roof panel has a lower thermal conductivity than the first roof panel.

[0008] The thermal conductivity of the second roof panel, which has a lower slope than the slope of the first roof panel, is lower than that of the first roof panel, ensuring the insulation performance of the thinner parts of the roof panel. This ensures the insulation performance of the attic without providing insulation material on the upper surface of the ceiling. The upper part of the beam is covered by the roof panel, which ensures the insulation performance of the thinner parts, so condensation is less likely to occur on the beam. This means that it is not necessary to take measures against condensation, such as spraying urethane foam on the beam. This improves workability.

[0009] (2) Claim 2 is the attic insulation structure described in claim 1, wherein the thermal conductivity of the first roof panel is 0.036 or more, and the thermal conductivity of the second roof panel is less than 0.036.

[0010] This makes it easier to ensure the insulation performance of the thinner parts of the roof panel.

[0011] (3) Claim 3 is an insulating structure for the attic described in claim 1 or 2, further comprising an insulating panel located on the underside of the ALC panel and sandwiching the ALC panel between the second roof panel and the insulating panel.

[0012] Since the insulation panel is placed under the thinner part of the roof panel, the insulation performance of the attic can be reinforced more efficiently than when an insulation panel is placed over the entire underside of the ALC panel.

[0013] (4) Claim 4 is an insulating structure for an attic described in any of claims 1 to 3, wherein the beams include a first beam located below the first roof panel and a second beam located below the second roof panel, and the insulating structure for the attic further includes an insulating covering material that covers the second beam.

[0014] Since the second beam located below the second roof panel is covered with an insulating covering material, condensation on the beam is more efficiently suppressed than when both the first beam and the second beam are covered with an insulating covering material.

[0015] (5) Claim 5 is an insulating structure for an attic as described in any one of claims 1 to 4, comprising an interior material that defines a living space between the ceiling panel and the exterior material, an exterior material that is arranged outside the interior material, and an insulating material that is arranged between the interior material and the exterior material, and the insulating material extends from a position below the ceiling panel to a position that contacts the underside of the ALC panel.

[0016] The insulation, ALC panels, and roof panels form a continuous line of insulation over the joists, better preventing condensation from forming on the joists. Effect of the Invention

[0017] According to the present invention, it is possible to improve the ease of installation while ensuring the thermal insulation performance of the ceiling. Since there is no need to install thermal insulation material in the ceiling, for example, the ceiling height can be ensured by omitting the ceiling board and the ceiling underlayment material that supports the ceiling board. It is possible to improve the maintainability of the ceiling equipment and reduce costs. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an attic insulation structure 1 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view showing a thermal insulation structure for an attic according to a modified example. [Diagram 3] FIG. 3 is a vertical cross-sectional view showing a thermal insulation structure for an attic according to another modified example. [Figure 4] FIG. 4 is a vertical cross-sectional view showing a conventional insulating structure for an attic. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an attic insulation structure 1 according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is merely one example of the present invention, and it goes without saying that the embodiment of the present invention can be appropriately modified without departing from the gist of the present invention.

[0020] The attic insulation structure 1 according to the present invention is applied to an apartment house. The attic insulation structure 1 according to the present invention may be applied to, for example, a detached house. The number of floors of the house is not particularly limited. The attic insulation structure 1 is applied to an apartment house made of light steel frame, but may also be applied to an apartment house made of reinforced concrete or a detached house made of wood. The attic insulation structure 1 is applied to an apartment house having a flat roof, but is not limited thereto. For example, the attic insulation structure 1 can be applied to any house having a sloped roof. Here, the attic insulation structure refers to a structure that blocks the inflow and outflow of heat between the outside of the house and the attic.

[0021] As shown in Fig. 1, the attic insulation structure 1 according to the present invention includes a beam 2, a plurality of ceiling panels 3, an ALC panel 4, a plurality of roof panels 5, an interior material 6, and an exterior material 7. The beam 2 is formed of an H-shaped steel. The beam 2 has an upper flange 2a, a lower flange 2b located below the upper flange 2a, and a connecting portion 2c that connects the upper flange 2a and the lower flange 2b in the up-down direction 21. Hereinafter, in Fig. 1, the leftward direction is defined as the leftward direction, and the rightward direction is defined as the rightward direction when viewed from the direction extending along the beam 2 (the direction perpendicular to the paper surface in Fig. 1, hereinafter referred to as the "beam direction"). The leftward direction and the rightward direction are combined to define the left-right direction 23.

[0022] The beam 2 is supported by a pillar (not shown). The beam 2 has a first beam 2A and a second beam 2B. The first beam 2A and the second beam 2B are positioned with an interval in the left-right direction 23. The first beam 2A is positioned to the right of the second beam 2B. In this embodiment, two first beams 2A and two second beams 2B are provided.

[0023] Each ceiling panel 3 is flat and extends in the beam direction and the left-right direction 23. The lower and upper surfaces of the ceiling panel 3 are rectangular. The material of each ceiling panel 3 is not particularly limited, and examples thereof include gypsum board and plywood. The thickness of each ceiling panel 3 is, for example, in the range of 9.5 mm to 25 mm. More preferably, it is in the range of 9.5 mm to 12.5 mm. The multiple ceiling panels 3 are connected to each other while being arranged in abutment in the horizontal direction. In this way, the multiple ceiling panels 3 form a ceiling. The lower surfaces of the multiple ceiling panels 3 define the upper end of the living space. The upper surfaces of the multiple ceiling panels 3 define the lower end of the ceiling space. The multiple ceiling panels 3 are supported by the beams 2. Specifically, the ceiling panels 3 are hung from a ceiling support bracket 9 fixed to the lower flange 2b of the beams 2.

[0024] The ceiling support bracket 9 has a mounting member 10, a plurality of first bolts 11, and a sill support 12. The mounting member 10 extends in the beam direction. The mounting member 10 has a horizontally U-shaped locking portion 10A formed to sandwich the lower flange 2b from above and below, and an extension portion 10B extending in the left-right direction 23 from the locking portion 10A. The locking portion 10A is fixed to the lower flange 2b by a plurality of second bolts A arranged at intervals in the beam direction.

[0025] The first bolts 11 are disposed on the extending portion 10B at intervals in the beam direction. Each of the first bolts 11 penetrates the extending portion 10B in the up-down direction 21.

[0026] The siding support 12 is formed in a horizontal U-shape extending in the beam direction. The siding support 12 may be formed in a horizontal U-shape extending along the left-right direction 23 perpendicular to the beam direction. A plurality of first bolts 11 are inserted into the upper wall portion 12A of the siding support 12. The upper wall portion 12A is fastened vertically by two nuts 11A, 11A screwed into the first bolt 11. As a result, the siding support 12 is attached to the first bolt 11. A siding 18 extending along the left-right direction 23 is fixed to the lower surface of the lower wall portion 12B of the siding support 12. The upper surface of the ceiling panel 3 is fixed to the lower surface of the siding 18. The ceiling panel 3 is flat and extends along the beam direction and the left-right direction 23. Both ends of the ceiling panel 3 in the left-right direction 23 abut against the inner surfaces of the left and right interior materials 6. The lower surface of the ceiling panel 3 defines a living space 8 together with the inner surfaces of the left and right interior materials 6 .

[0027] The ALC panel 4 is located on the upper surface 2aa of the upper flange 2a of the beam 2. The ALC panel 4 is fixed to the upper surface 2aa of the upper flange 2a of the beam 2 by a fastener such as a bolt. The ALC panel 4 is flat and extends in the beam direction and the left-right direction 23. The upper surface 4a and the lower surface 4b of the ALC panel 4 are rectangular. The upper surface 4a and the lower surface 4b of the ALC panel 4 are parallel to a horizontal plane. The length of the ALC panel 4 in the left-right direction 23 is longer than the length of the ceiling (hereinafter simply referred to as the ceiling) constituted by the multiple ceiling panels 3 in the left-right direction 23. Both ends of the ALC panel 4 in the left-right direction 23 are located outward from both ends of the ceiling in the left-right direction 23. The ALC panel 4 is formed of lightweight aerated concrete. The thickness of the ALC panel 4 is, for example, in the range of 75 mm to 150 mm. More preferably, the thickness of the ALC panel 4 is in the range of 75 mm to 100 mm. The lower surface 4b of the ALC panel 4 defines the upper end of the ceiling space 17.

[0028] The multiple roof panels 5 are located on the upper surface 4a of the ALC panel 4. Each roof panel 5 extends in the beam direction and the left-right direction 23. The upper surface 5a and the lower surface 5b of each roof panel 5 are rectangular. The lower surface 5b of each roof panel 5 is parallel to the horizontal plane. The upper surface 5a of each roof panel 5 is inclined diagonally downward to the left with respect to the horizontal plane. The multiple roof panels 5 are connected to each other while being arranged in abutment in the horizontal direction. As a result, the multiple roof panels 5 form a roof. The multiple roof panels 5 are fixed to the upper surface 4a of the ALC panel 4 by fasteners such as bolts. The length of the roof (hereinafter simply referred to as the roof) formed by the multiple roof panels 5 in the left-right direction 23 is longer than the length of the ceiling in the left-right direction 23. Both ends of the roof in the left-right direction 23 are located outward from both ends of the ceiling in the left-right direction 23. As a result, the roof covers the entire ceiling in the left-right direction 23 from above.

[0029] The upper surface 5a of the roof forms a sloped surface that slopes diagonally downward with respect to the horizontal plane so that rainwater can easily flow toward the rain gutters. In this embodiment, the sloped surface slopes diagonally downward to the left with respect to the horizontal plane. The sloped surface is continuous from the right end to the left end of the roof. The gradient of the sloped surface with respect to the horizontal plane is set to, for example, 1%. As a result, the thickness of the roof becomes thinner toward the left. A roofing sheet (not shown) may be attached to the upper surface 5a of the roof.

[0030] The multiple roof panels 5 include a normal insulation panel 5A (an example of a first roof panel) and a high-performance insulation panel 5B (an example of a second roof panel). The normal insulation panel 5A is adjacent to the right side of the high-performance insulation panel 5B. The normal insulation panel 5A is arranged in a portion that constitutes the right half of the roof. The normal insulation panel 5A overlaps with two first beams 2A when viewed from the vertical direction 21. The left first beam 2A of the two first beams 2A is located below the boundary between the normal insulation panel 5A and the high-performance insulation panel 5B. The right first beam 2A of the two first beams 2A is located between the right interior material 6 and the right exterior material 7 described below. The thickness L1 of the right end of the normal insulation panel 5A is set to, for example, 130 mm. The thickness L2 of the left end of the normal insulation panel 5A (the right end of the high-performance insulation panel 5B) is set to, for example, 80 mm.

[0031] The normal insulation panel 5A is formed of, for example, foamed plastic. Examples of foamed plastic include polystyrene foam, rigid urethane foam, and phenol foam. The thermal conductivity of the normal insulation panel 5A is 0.036 (W / m K) or more. The thermal conductivity of the normal insulation panel 5A can be changed, for example, by changing the material or the foaming rate.

[0032] The high-performance insulating panel 5B is disposed at a position on the roof where the slope of the panel is lower than that of the normal insulating panel 5A. In other words, the high-performance insulating panel 5B is disposed at a position on the roof where the thickness of the panel is thinner than that of the normal insulating panel 5A. In this embodiment, the high-performance insulating panel 5B is adjacent to the left side of the normal insulating panel 5A. The high-performance insulating panel 5B is located in a portion that constitutes the left half of the roof. The high-performance insulating panel 5B and the normal insulating panel 5A are flush with each other from the right end to the left end of the roof to form the same slope. The thickness L2 of the right end of the high-performance insulating panel 5B (the left end of the normal insulating panel 5A) is set to, for example, 80 mm. The thickness L3 of the left end of the high-performance insulating panel 5B is set to, for example, 30 mm.

[0033] The high-performance insulation panel 5B overlaps with two second beams 2B when viewed from the up-down direction 21. Of the two second beams 2B, the right second beam 2B is located below the middle part of the high-performance insulation panel 5B in the left-right direction 23. Of the two second beams 2B, the left second beam 2B is located between the left interior material 6 and the left exterior material 7 described below.

[0034] The high-performance insulating panel 5B is formed of, for example, foamed plastic. Examples of foamed plastic include polystyrene foam, rigid urethane foam, and phenol foam. The thermal conductivity of the high-performance insulating panel 5B is lower than that of the high-performance insulating panel 5B. The thermal conductivity of the high-performance insulating panel 5B is less than 0.036 (W / m·K). Preferably, the thermal conductivity of the high-performance insulating panel 5B is less than 0.028 (W / m·K), and more preferably, is less than 0.022 (W / m·K). The thermal conductivity of the high-performance insulating panel 5B can be changed, for example, by changing the material or the foaming rate.

[0035] The thermal conductivity of the high-performance heat insulating panel 5B and the normal heat insulating panel 5A can be measured, for example, by a so-called steady-state method in which a steady temperature gradient is applied to a sample and the thermal conductivity is measured. Specifically, the thermal conductivity can be calculated by measuring the temperature at each point in the sample while keeping one side of the sample at a high temperature and the other side at a low temperature.

[0036] A plurality of lower insulation panels 14 (one example of insulation panels) are arranged below the high-performance insulation panel 5B. Each lower insulation panel 14 sandwiches the ALC panel 4 between the high-performance insulation panel 5B. Each lower insulation panel 14 is flat and extends in the beam direction and the left-right direction 23. The upper and lower surfaces of the lower insulation panel 14 are rectangular and elongated in the beam direction. The lower insulation panels 14 are connected to each other while being arranged in contact with each other in the beam direction. The lower insulation panels 14 overlap with the approximately left half of the high-performance insulation panel 5B in the up-down direction 21. The thermal conductivity of each lower insulation panel 14 is not particularly limited. Each lower insulation panel 14 is formed of, for example, glass wool, rock wool, polystyrene foam, hard urethane foam, phenol foam, or the like. The lower insulation panels 14 are fixed to the lower surface 4b of the ALC panel 4 by fasteners such as bolts.

[0037] The right second beam 2B of the two second beams 2B is covered with a heat insulating covering material 15. The heat insulating covering material 15 is formed of, for example, glass wool or rock wool. The heat insulating covering material 15 is formed in a substantially rectangular shape long in the beam direction. The heat insulating covering material 15 covers the second beam 2B from below. Specifically, the heat insulating covering material 15 extends downward from a position where it contacts the right end of the upper flange 2a of the second beam 2B and the lower surface 4b of the ALC panel 4, surrounds the lower flange 2b from below, and extends upward to a position where it contacts the lower surface of the lower insulation panel 14. The left and right ends of the heat insulating covering material 15 are supported by mounting brackets (not shown) attached to the lower surface 4b of the ALC panel 4 and the lower surface 14a of the insulation panel 14. The mounting brackets are not particularly limited as long as they can attach the heat insulating covering material 15 to the lower surface 4b of the ALC panel 4 and the lower surface 14a of the insulation panel 14.

[0038] The interior material 6 divides the living space 8 between the ceiling panel 3 and the interior material 6. The interior material 6 is flat and extends in the beam direction and the vertical direction 21. The left and right surfaces of the interior material 6 are rectangular. The interior material 6 defines both ends of the living space 8 in the left-right direction 23. The interior material 6 is formed of gypsum board. The thickness of the interior material 6 is, for example, in the range of 9.5 mm to 15 mm. More preferably, it is in the range of 9.5 mm to 12.5 mm. Note that wallpaper (not shown) may be attached to the inner surface of the gypsum board. Both ends of the ceiling panel 3 in the left-right direction 23 are in contact with the inner surface of the interior material 6. The interior material 6 extends above the ceiling panel 3 and contacts the lower surface 4b of the ALC panel 4. As a result, the interior material 6 defines both ends of the ceiling space 17 in the left-right direction 23.

[0039] The exterior material 7 is located outside the left and right interior materials 6 with a gap therebetween. The exterior material 7 forms the left and right exterior walls of the building. The exterior material 7 is flat and extends in the beam direction and the vertical direction 21. The left and right faces of the exterior material 7 are rectangular. The exterior material 7 extends upward more than the interior material 6. Both ends of the ALC panel 4 in the left and right direction 23 and both ends of the roof panel 5 in the left and right direction 23 are in contact with the inner surface of the exterior material 7. The exterior material 7 is not particularly limited, and can be formed of, for example, wood, stone, steel, etc. The thickness of the exterior material 7 is, for example, in the range of 12 mm to 100 mm. More preferably, it is in the range of 16 mm to 75 mm.

[0040] Insulating materials 16 are disposed between the left exterior material 7 and the left interior material 6, and between the right exterior material 7 and the right interior material 6. Each insulating material 16 extends from a position below the ceiling panel 3 to a position where it contacts the underside 4b of the ALC panel 4. As a result, the left and right insulating materials 16, the ALC panel 4, the normal insulating panel 5A, and the high-performance insulating panel 5B form a continuous insulating line in an inverted U shape so as to cover the first beam 2A and the second beam 2B in the attic 17. Each insulating material 16 can be formed of, for example, glass wool or rock wool.

[0041] [Effects of the embodiment] In the attic insulation structure 1, the thermal conductivity of the high-performance insulation panels 5B is lower than that of the normal insulation panels 5A, so insulation performance is ensured in the thinner parts of the roof. For this reason, even if the insulation material on the top surface of the ceiling panel 3 is omitted, the insulation performance of the attic 17 is ensured. Since the upper part of the beams 2 is covered by the roof, whose insulation performance in the thinner parts is ensured by the high-performance insulation panels 5B, condensation is less likely to occur on the beams 2 even if anti-condensation measures such as spraying urethane foam on the beams 2 are omitted. For this reason, the attic insulation structure 1 is easy to install.

[0042] In the attic insulation structure 1, the thermal conductivity of the high-performance insulation panel 5B is less than 0.036 (W / m·K), so that the insulation performance of the thin parts of the roof is ensured.

[0043] In the attic insulation structure 1, a lower insulation panel 14 is provided, which is located on the underside 4b of the ALC panel 4 and sandwiches the ALC panel 4 between the high-performance insulation panel 5B. Therefore, the insulation performance is reinforced by the lower insulation panel 14 below the thin part of the roof, so the insulation performance of the attic 17 is reinforced more efficiently than when the lower insulation panel 14 is placed over the entire underside 4b of the ALC panel 4.

[0044] In the attic insulation structure 1, the second beam 2B on the right side located below the high-performance insulation panel 5B is covered with a thermal insulation covering material 15. Therefore, compared to the case where both the first beam 2A and the second beam 2B are covered with the thermal insulation covering material 15, condensation on the beam 2 is more efficiently suppressed.

[0045] In the attic insulation structure 1, the left and right insulation materials 16, the ALC panels 4, the regular insulation panels 5A and the high-performance insulation panels 5B form a continuous insulation line in an inverted U shape that covers the attic 17, thereby suppressing condensation from occurring on the first beams 2A and the second beams 2B in the attic 17.

[0046] [Variations] In the attic insulation structure 1, the thermal conductivity of the high-performance insulation panel 5B is less than 0.036 (W / m·K), but it may be 0.036 (W / m·K) or more as long as it is lower than the thermal conductivity of the normal insulation panel 5A.

[0047] In the attic insulation structure 1, a lower insulation panel 14 arranged on the lower surface 4b of the ALC panel 4 and an insulation covering material 15 covering the second beam 2B are provided below the high-performance insulation panel 5B, but the lower insulation panel 14 and the insulation covering material 15 may be omitted as shown in Fig. 2. In this case, it is preferable that the thermal conductivity of the high-performance insulation panel 5B is set to less than 0.028 (W / m·K), for example. Note that in Fig. 2, the right second beam 2B of the two second beams 2B is omitted, but the right second beam 2B may be provided below the high-performance insulation panel 5B.

[0048] In the attic insulation structure 1, the high-performance insulation panel 5B constitutes the part of the roof where the thickness is 80 mm or less (the left half of the roof), but as long as the insulation performance of the attic 17 can be ensured, it may also constitute the part of the roof where the thickness is less than 80 mm (the part located to the left of the center in the left-right direction 23 of the roof) (see Figure 2).

[0049] In the attic insulation structure 1, the upper surface 4a of the ALC panel 4 is formed parallel to the horizontal plane, but it may be formed in a stepped shape as shown in Fig. 3. For example, a step is formed on the upper surface 4a of the ALC panel 4 by combining a thick ALC panel 4 with a thin ALC panel 4. In this case, the lower surface 5b of the roof panel 5 is formed to have a step that matches the step on the upper surface 4a of the ALC panel 4.

[0050] In the attic insulation structure 1, the left half of the roof made up of multiple roof panels 5 is made of high-performance insulation panel 5B, and the right half of the roof is made of normal insulation panel 5A. However, for example, as shown in Figure 3, if there is a thin portion in the right half of the roof due to a step being formed on the upper surface 4a of the ALC panel 4, this thin portion may be made up of high-performance insulation panel 5B.

[0051] In the attic insulation structure 1, multiple ceiling panels 3 make up the ceiling, but this may be omitted. In this case, the ALC panels 4 make up the ceiling. Therefore, the beams 2, lower insulation panels 14, and joists 18 are omitted. The living space 8 is defined by the undersides 4b of the ALC panels 4 and the inner faces of the left and right interior materials 6. In this way, it is easy to ensure the ceiling height, and it is possible to improve the maintainability of the ceiling equipment and reduce costs.

[0052] [Claim 1] Beams and A ceiling panel supported by the beam; An ALC panel located on the top surface of the beam; and a plurality of roof panels attached to the upper surface of the ALC panel, the upper surface of the roof panel being a sloped surface; The plurality of roof panels are A first roof panel; a second roof panel adjacent to the first roof panel and having a sloped surface lower than the sloped surface of the first roof panel; The second roof panel is an insulating structure above the ceiling that has a lower thermal conductivity than the first roof panel.

[0053] [Claim 2] The thermal conductivity of the first roof panel is 0.036 (W / m K) or more, The attic insulation structure according to claim 1, wherein the thermal conductivity of the second roof panel is less than 0.036 (W / m·K).

[0054] [Claim 3] The attic insulation structure as described in claim 1, further comprising an insulation panel located on the underside of the ALC panel and sandwiching the ALC panel between the second roof panel and the insulation panel.

[0055] [Claim 4] The beam includes a first beam located below the first roof panel and a second beam located below the second roof panel, The attic insulation structure according to claim 1, further comprising an insulating covering material that covers the second beam.

[0056] [Claim 5] An interior material that defines a living space between the ceiling panel and the interior material; An exterior material disposed outside the interior material; and a heat insulating material disposed between the interior material and the exterior material, An insulating structure for an attic as described in any one of claims 1 to 4, wherein the insulating material extends from a position below the ceiling panel to a position in contact with the underside of the ALC panel. [Explanation of symbols]

[0057] 1. Attic insulation structure 2...beam 2aa...Top surface 2A...1st beam 2B...Second beam 3. Ceiling panel 4. ALC panel 4b...Bottom surface 5. Roof panel 5a...Top surface (sloping surface) 5A: Regular insulation panel (an example of the first roof panel) 5B High-performance insulation panel (an example of a second roof panel) 6. Interior materials 7. Exterior materials 8...living space 14. Bottom insulation panel (example of insulation panel) 15. Thermal insulation coating material 16...Insulation material

Claims

1. Beams and A ceiling panel supported by the beam; An ALC panel located on the upper surface of the beam; a plurality of roof panels attached to the upper surface of the ALC panel, the upper surface of the roof panels being a sloped surface; The plurality of roof panels are A first roof panel; a second roof panel adjacent to the first roof panel and having a sloped surface lower than the sloped surface of the first roof panel; The second roof panel is an insulating structure above the ceiling having a lower thermal conductivity than the first roof panel.

2. The thermal conductivity of the first roof panel is 0.036 (W / m·K) or more, The attic insulation structure according to claim 1, wherein the thermal conductivity of the second roof panel is less than 0.036 (W / m·K).

3. The attic insulation structure according to claim 1, further comprising an insulation panel located on the underside of the ALC panel and sandwiching the ALC panel between the second roof panel and the insulation panel.

4. The beams include a first beam located below the first roof panel and a second beam located below the second roof panel, The attic insulation structure according to claim 1 , further comprising an insulating covering material covering the second beam.

5. An interior material that defines a living space between the ceiling panel and the interior material; An exterior material disposed outside the interior material; and a heat insulating material disposed between the interior material and the exterior material, 5. The attic insulation structure according to claim 1, wherein the insulation material extends from a position below the ceiling panel to a position in contact with the underside of the ALC panel.

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