Buildings

Abstract

To provide a building having a flat roof capable of suppressing dew condensation on an upper surface of a ceiling member.SOLUTION: A building comprises: a roof plate member extending in a horizontal direction and constituting a roof; a ceiling plate member provided below and separated from the roof plate member so as to form an attic space below the roof panel member and constituting a ceiling; a wall member having therein a ventilation part extending upward from below and having an opening provided in a region between the roof plate member and the ceiling plate member; a heat insulating member provided along the roof plate member; and a first moisture-proof member provided between the roof plate member and the ceiling plate member so as to block the attic space and the opening of the ventilation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to buildings. [Background technology]

[0002] In buildings with sloping roofs, as disclosed in Patent Document 1, for example, insulation is installed along the roof and the attic is sometimes used as a room. In such cases, there is a problem of condensation forming in the attic because the attic is not ventilated. In the building disclosed in Patent Document 1, a vent is installed inside the roof to ventilate the inside of the roof, thereby suppressing condensation on the underside of the roof. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-213832 A Summary of the Invention [Problem to be solved by the invention]

[0004] Even in buildings with flat roofs, if the roof is insulated, ventilation of the attic is generally not performed. In buildings with flat roofs, ventilation parts are provided inside the walls to prevent air from building up inside the walls, and these ventilation parts may be connected to the attic. In this case, there is a problem that humid air enters the attic through the ventilation parts provided in the walls, and in summer, condensation occurs on the top surface of the ceiling in the attic due to the temperature difference between the attic and the room, with the ceiling as the boundary, and in winter, condensation occurs on the underside of the roof boards in the attic due to the temperature difference between the attic and the outdoors, with the roof boards as the boundary.

[0005] The present invention has been made in consideration of such problems, and is capable of suppressing condensation on the upper surface of a ceiling member and the lower surface of a roof panel. Construction The purpose is to provide creations. [Means for solving the problem]

[0006] As a result of extensive investigations, the present inventors have found that the above object can be achieved by the following invention.

[0007] A building according to one aspect of the present invention comprises a roofing panel extending horizontally to form a roof, a ceiling panel for forming a ceiling and arranged below and away from the roofing panel so that an attic is formed below the roofing panel, a wall member having an interior ventilation section extending from below to above and an opening provided in the area between the roofing panel and the ceiling panel, an insulating member arranged along the roofing panel, and a first moisture-proof member arranged between the roofing panel and the ceiling panel so as to block the attic from the opening in the ventilation section.

[0008] In the above-mentioned building, the first moisture-proof member prevents humid air from flowing into the attic from outside the building 1 through the ventilation section of the wall member. This prevents the humidity from increasing around the ceiling board material and the roof board material. Therefore, even if the ceiling board material is cooled by the indoor temperature in summer, condensation on the upper surface of the ceiling board material can be prevented, and even if the roof board material is cooled by the outdoor air temperature in winter, condensation on the lower surface of the roof board material can be prevented.

[0009] In the above-mentioned building, the heat insulating member may have moisture-proof properties.

[0010] In this embodiment, the moisture-proof insulating material prevents humid air from flowing from the roof panel into the attic, so that condensation on the upper surface of the ceiling panel can be further suppressed even when the ceiling panel is cooled in summer.

[0011] The above-mentioned building may further include a second moisture-proof member provided along the ceiling board material.

[0012] In this embodiment, the second moisture-proof member prevents humid air from flowing from the room into the attic through the ceiling panel material, thereby further preventing condensation on the underside of the roof panel material even when the roof panel material is cooled in winter.

[0013] The above-mentioned building may further include a second moisture-proof member arranged along the ceiling panel material, the roof panel material having a roof component that constitutes the roof and an upper floor support portion adjacent to the roof component that supports an upper floor, the insulating member having an insulating extension portion extending along the roof component of the roof panel material, the second moisture-proof member having a moisture-proof extension portion extending along the ceiling panel material in an area that overlaps with the roof component in a planar view, and the building may further include a third moisture-proof member that isolates the area sandwiched between the insulating extension portion and the moisture-proof extension portion from other areas.

[0014] In this embodiment, the third moisture-proof section prevents humid air from flowing from other areas into the area that overlaps with the attic roof component, thereby suppressing condensation in the area that overlaps with the attic roof component.

[0015] The above-mentioned building may further include a beam supporting the roof panel material on the ventilation section side of the first moisture-proof member, and the first moisture-proof member may have thermal insulation properties.

[0016] For example, when a beam is cooled by the temperature from inside the room through the attic, condensation may occur on the surface of the beam when humid warm air flowing in from the ventilation section comes into contact with the cooled beam. However, in this embodiment, the first moisture-proof member having thermal insulation properties is interposed between the attic and the beam, preventing the beam from being cooled by the temperature of the attic, and therefore condensation on the surface of the beam can be suppressed.

[0017] In the above-mentioned structure, the heat insulating member may be provided along the underside of the roof panel, and the structure may further include a waterproof member provided along the upper surface of the roof panel.

[0018] In this embodiment, the waterproofing member prevents the roofing material from getting wet by rain, thereby preventing rain from penetrating the roofing material and causing humid air to flow into the attic, which can lead to condensation. Effect of the Invention

[0019] According to the present invention, it is possible to provide a building having a flat roof that is capable of suppressing condensation on the upper surface of a ceiling component and the underside of a roof panel material. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a partial vertical cross-sectional view of the periphery of a roof of a building according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 3 is a schematic diagram for explaining the position at which the first heat insulating member according to the embodiment of the present invention is provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a structure according to an embodiment of the present invention will be described with reference to the drawings.

[0022] (Structure of the building) 1 is a partial vertical cross-sectional view of the periphery of a roof of a building according to this embodiment. The building 1 according to this embodiment has beams 4, a roof 2 and an upper floor 6 supported on the beams 4, an exterior wall 12, a ceiling panel material 18 forming an attic 3 between the roof 2 and the exterior wall 12, and a heat insulating and moisture-proof member 20 provided in the attic 3.

[0023] Next, each element that constitutes the building 1 will be described.

[0024] The beams 4 constitute the framework of the building 1 and include a first beam 4a (beam), a second beam 4b, and a third beam 4c. The three beams 4 are each made of H-shaped steel and are arranged horizontally from the outside to the inside. A soft fireproof covering material 5 is provided on the first beam 4a so as to cover the inner side surface. A soft fireproof covering material 5 is provided on both side surfaces and the bottom surface of the second beam 4b and the third beam 4c. In addition, a moisture-proof member base sheet 5a is provided so as to cover the fireproof covering material 5 provided on the first beam 4a and the third beam 4c.

[0025] The roof plate material 11 is provided on the upper part of the beams 4 and is supported from below by the beams 4. The roof plate material 11 has a plurality of ALC (Autoclaved Lightweight Aerated Concrete) panels arranged side by side in the horizontal direction.

[0026] The roof 2 (flat roof) extends horizontally and has a roof constituent part 11a, a second insulating member 14 provided on the upper surface of the roof constituent part 11a, a plate material 15 provided on the upper surface of the second insulating member 14, and a waterproof member 17 provided on the upper surface of the plate material 15. The roof plate material 11 has the roof constituent part 11a for constituting the roof 2, and an upper floor supporting part 11b for supporting the upper floor 6. A boundary 26 between the roof 2 and the upper floor 6 adjacent to the roof 2 is set at the center in the thickness direction of the wall 6a of the upper floor 6, and the roof constituent part 11a and the upper floor supporting part 11b are also separated by the boundary 26.

[0027] In FIG. 1, the first beam 4a is provided below the outer end of the roof 2, the third beam 4c is provided so that the web of the H-shaped steel is located below the boundary 26, and the second beam 4b is provided between the first beam 4a and the third beam 4c.

[0028] The second insulating member 14 is made of an insulating material such as extruded polystyrene foam, and has a portion that extends along the roof constituent portion 11a. The waterproofing member 17 is provided along the upper surface of the roof plate material 11. The upper surface of the waterproofing member 17 is inclined downward from the upper floor 6 side toward the outside, so that rainwater or sprinkled water that falls on the upper surface of the waterproofing member 17 can be easily removed toward the outside.

[0029] The exterior wall 12 has an interior panel 12c made of a plate material such as gypsum board and facing the interior of the room, an insulating panel 12d provided on the outside of the interior panel 12c, an exterior wall panel 12e provided on the outside of the insulating panel 12d with a gap and extending above the roof 2, a parapet panel 12f provided on the inside of the upper part of the exterior wall panel 12e, and a covering member 12g covering the upper ends of the exterior wall panel 12e and the parapet panel 12f.

[0030] The insulating panel 12d has a frame body 12d1, a soft insulating material 12d2 such as glass wool provided inside the frame body 12d1, and a hard insulating material 12d3 such as extruded polystyrene foam provided on the outside of the frame body 12d1 and the soft insulating material 12d2.

[0031] The interior panel 12c and the heat insulating panel 12d are provided below the first beam 4a.

[0032] A ventilation portion 12h extending from below to above is provided between the exterior wall panel 12e and the rigid insulating material 12d3.

[0033] An opening 12h1 of the ventilation section 12h is provided at the upper end of the heat insulating panel 12d.

[0034] The exterior wall 12 is divided into a lower wall portion 12a (wall member) and an upper parapet portion 12b with the upper end of the heat-insulating panel 12d as the boundary. Therefore, the wall portion 12a has a ventilation portion 12h inside, and an opening 12h1 of the ventilation portion 12h is provided at the upper end of the wall portion 12a. The opening 12h1 is also provided in the region between the roof panel material 11 and the ceiling panel material 18. One end of the fire-resistant covering material 5 is inserted into the opening 12h1, but since the fire-resistant covering material 5 has air permeability, the opening 12h1 is not sealed.

[0035] The ceiling plate material 18 is made of a plate material such as gypsum board, and is provided below the roof plate material 11 so that the attic 3 is formed below the roof plate material 11, forming a ceiling. The ceiling plate material 18 is fixed to the upper end of the frame body 12d1 of the heat-insulating panel 12d via a joist 19 that contacts the upper surface of the ceiling plate material 18. In this embodiment, the attic 3 is a space sandwiched between the roof plate material 11 and the ceiling plate material 18. In FIG. 1, the portion of the joist 19 that overlaps with the heat-insulating moisture-proof member 20 is also shown by a solid line for convenience.

[0036] The heat insulating and moisture-proof member 20 includes a first heat insulating member 13 , a second moisture-proof member 23 , a first moisture-proof member 21 , a third moisture-proof member 24 , and a fourth moisture-proof member 25 .

[0037] The first insulating member 13 is provided along the roof constituent part 11a between adjacent beams 4 on the underside of the roof constituent part 11a of the roof board material 11. In this embodiment, the first insulating member 13 is provided only on the underside of the roof constituent part 11a, and has only an insulating extension part. The first insulating member 13 is made of urethane foam provided by spraying, and has moisture resistance in addition to heat insulation properties.

[0038] The second moisture-proof member 23 is provided on the upper surface of the ceiling panel material 18, and is sandwiched between the ceiling panel material 18 and the joist 19. The second moisture-proof member 23 is made of a moisture-proof film, and has a moisture-proof extension portion 23a that extends along the upper surface of the ceiling panel material 18 in a region that overlaps with the roof constituent portion 11a in a plan view. In addition, the end portion of the second moisture-proof member 23 is bent so as to rise upward on the inside (upper floor 6 side) of the moisture-proof extension portion 23a and on the inside (below the third beam 4c) of the boundary 26 between the roof 2 and the upper floor 6.

[0039] The first moisture-proof member 21, the third moisture-proof member 24 and the fourth moisture-proof member 25 are arranged between the underside of the roof panel material 11 and the upper surface of the ceiling panel material 18 (the upper surface of the second moisture-proof member 23) in the order of the first moisture-proof member 21, the fourth moisture-proof member 25 and the third moisture-proof member 24 from the outside, so as to seal the gap between the underside of the roof panel material 11 and the upper surface of the ceiling panel material 18.

[0040] The first moisture-proof member 21 is provided so as to block the attic 3 and the opening 12h1 of the ventilation section 12h of the wall section 12a, and covers the surface of the fireproof covering material 5 provided on the inside of the first beam 4a from the inside via the moisture-proof member base sheet 5a. That is, the first beam 4a is provided closer to the ventilation section 12h than the first moisture-proof member 21.

[0041] The third moisture-proof member 24 is provided so as to cover both sides and the underside of the fireproof covering material 5 provided on the third beam 4c via the moisture-proof member base sheet 5a, and isolates the area sandwiched between the first heat insulating member 13 and the moisture-proof extension portion 23a of the attic 3 from the other areas. Specifically, as shown in FIG. 2, the third moisture-proof member 24 is provided along the boundary 26. In FIG. 2, the fourth moisture-proof member 25 and the beam 4 are omitted. In this embodiment, only the area sandwiched between the first heat insulating member 13 and the moisture-proof extension portion 23a, which is partitioned by the boundary 26, of the attic 3 is the area to be isolated from the opening 12h1. In this way, when a predetermined area of ​​the attic 3 is to be isolated from the opening 12h1, the first moisture-proof member 21 and the third moisture-proof member 24 may be provided so as to surround the predetermined area. On the other hand, when the entire area of ​​the attic 3 is to be blocked off from the opening 12h1, the first moisture-proof member 21 can be provided so as to surround the attic 3 along the entire length of the opening 12h1.

[0042] The fourth moisture-proof member 25 is provided so as to cover both side surfaces and the bottom surface of the fire-resistant covering material 5 provided on the second beam 4b via a moisture-proof member base sheet 5a.

[0043] The first moisture-proof member 21, the third moisture-proof member 24, and the fourth moisture-proof member 25 are made of urethane foam applied by spraying, and have heat insulating properties in addition to moisture-proofing properties. The first moisture-proof member 21, the third moisture-proof member 24, and the fourth moisture-proof member 25, together with the first heat-insulating member 13, can be applied by foaming and spraying liquid urethane.

[0044] Here, the temperature gradient between the ceiling panel material 18 and the waterproof member 17 will be explained, and then the positions at which the first heat insulating member 13 and the second moisture proof member 23 are provided will be explained.

[0045] As shown in the schematic diagram of Figure 3, when the temperature inside the building 1 is higher than the temperature of the outside air, such as in winter, a temperature gradient occurs such that the temperature decreases from the ceiling panel material 18 toward the waterproof member 17. If the first heat insulating member 13 and the second moisture-proof member 23 were not provided, this temperature gradient would cause the temperature of the air between the ceiling panel material 18 and the waterproof member 17 at position A1 between the ceiling panel material 18 and the waterproof member 17 to reach the dew point, and in the region from position A1 to the waterproof member 17, the temperature is below the dew point, causing condensation.

[0046] On the other hand, when the temperature inside the building 1 is lower than the outside air temperature, such as in summer, a temperature gradient occurs such that the temperature decreases from the waterproof member 17 toward the ceiling panel material 18. If the first heat insulating member 13 and the second moisture-proof member 23 were not provided, this temperature gradient would cause the temperature of the air between the ceiling panel material 18 and the waterproof member 17 to reach the dew point at position A2 between the ceiling panel material 18 and the waterproof member 17, and condensation would occur in the region from position A2 to the ceiling panel material 18 because the temperature is below the dew point.

[0047] The air between the ceiling panel material 18 and the waterproofing member 17 is cooled by the indoor air in summer and by the outside air in winter, so position A2 where the dew point occurs in summer is located closer to the indoor side, i.e., on the ceiling panel material 18 side, than position A1 where the dew point occurs in winter.

[0048] The second moisture-proof member 23 may be disposed closer to the ceiling panel 18 than position A1, where the dew point occurs in winter. This allows the second moisture-proof member 23 to prevent high humidity air from entering from the room through the ceiling panel 18 toward the waterproof member 17 than position A1 in winter, and prevents condensation from forming in the region from position A1 to the waterproof member 17.

[0049] The first insulating member 13 may be disposed closer to the waterproof member 17 than the position A2 where the dew point occurs in summer. This allows the first insulating member 13 to suppress the inflow of humid air from outside the building 1 toward the ceiling board material 18 side than position A2 through the waterproof member 17, board material 15, second insulating member 14, and roof board material 11 in summer, and suppresses the occurrence of condensation in the region from position A2 to the ceiling board material 18. In this embodiment, the waterproof member 17 also has a certain degree of moisture resistance, so the waterproof member 17 can also suppress the inflow of humid air from outside the building 1 in summer to a certain extent.

[0050] Furthermore, if the first insulating member 13 is disposed closer to the ceiling panel 18 than position A1 where the dew point occurs in winter, the first insulating member 13 in addition to the second moisture-proof member 23 can prevent high humidity air from flowing from the room through the ceiling panel 18 to the waterproof member 17 side closer to position A1 in winter. This can further prevent condensation from occurring in the region from position A1 to the waterproof member 17. In this embodiment, the first insulating member 13 is disposed closer to the ceiling panel 18 than position A1 where the dew point occurs in winter and closer to the waterproof member 17 than position A2 where the dew point occurs in summer, i.e., between positions A1 and A2.

[0051] The positions of the first heat insulating member 13 and the second moisture-proof member 23 can be adjusted by adjusting the thicknesses of the ceiling panel material 18, the roof panel material 11, the second heat insulating member 14, the panel material 15 and the waterproof member 17.

[0052] (Action, effect) In the building 1 according to this embodiment, the first moisture-proof member 21 prevents humid air from entering the attic 3 from outside the building 1 through the ventilation section 12h of the wall section 12a. This prevents the humidity from increasing around the ceiling board material 18, the joists 19, and the roof board material 11. Therefore, even if the ceiling board material 18 and the joists 19 are cooled by the indoor temperature in summer, condensation on the upper surface of the ceiling board material 18 and the joists 19 can be suppressed. Also, even if the roof board material 11 is cooled by the outdoor temperature in winter, condensation on the lower surfaces of the first heat insulating member 13, the roof board material 11, the second heat insulating member 14, the board material 15, and the waterproofing member 17 can be suppressed.

[0053] In addition, since the first heat insulating member 13 has moisture-proofing properties, the first heat insulating member 13 suppresses the inflow of humid air from the outside of the building 1 to the attic 3 through the waterproofing member 17, the plate material 15, the second heat insulating member 14, and the roof plate material 11. If the roof plate material 11 originally contains moisture, the inflow of moisture contained in the roof plate material 11 to the attic 3 is also suppressed. Furthermore, the second moisture-proof member 23 also suppresses the inflow of humid air from the outside of the building 1 to the ceiling plate material 18 and the rafters 19 through the attic 3. Therefore, even if the ceiling plate material 18 and the rafters 19 are cooled in the summer, condensation on the upper surface of the ceiling plate material 18 and the rafters 19 can be further suppressed.

[0054] On the other hand, when the temperature and humidity inside the building 1 are higher than the temperature and humidity outside the building 1, such as in winter, the second moisture-proof member 23 prevents humid air from flowing in from inside the building 1 through the ceiling panel material 18 and the attic 3 into the first insulation member 13, roof panel material 11, second insulation member 14, panel material 15, waterproof member 17, and beams 4. The inflow of humid air from inside the building is prevented by the first insulation member 13 into the roof panel material 11, second insulation member 14, panel material 15, and waterproof member 17, and by the first moisture-proof member 21 into the beams 4.

[0055] As a result, even if the first insulating member 13, roof panel 11, second insulating member 14, panel 15, waterproof member 17, and beam 4 are cooled by the influence of the external temperature in winter, the second moisture-proof member 23 suppresses an increase in humidity around these members. This suppresses the occurrence of condensation on the undersides of the first insulating member 13, roof panel 11, second insulating member 14, panel 15, and waterproof member 17, and on the beam 4. The occurrence of condensation is suppressed on the undersides of the roof panel 11, second insulating member 14, panel 15, and waterproof member 17 by the first insulating member 13, and on the beam 4 by the first moisture-proof member 21.

[0056] Furthermore, in the building 1, the first heat insulating member 13, the first moisture-proof member 21 and the second moisture-proof member 23 not only suppress the occurrence of condensation but also improve the airtightness of the building 1.

[0057] In addition, in the building 1 according to this embodiment, the upper floor 6 is provided adjacent to the roof 2, and the upper floor support portion 11b of the roof panel material 11 below the upper floor 6 is less susceptible to the effects of the external temperature due to the upper floor 6. Therefore, the upper floor support portion 11b is less susceptible to condensation on its underside, and condensation is also less likely to occur in the area of ​​the ceiling panel material 18 that overlaps with the upper floor support portion 11b in a plan view, so there is less need to provide the second moisture-proof member 23 and the first heat-insulating member 13. In the building 1 according to this embodiment, the first heat-insulating member 13 is omitted on the underside of the upper floor support portion 11b, and the second moisture-proof member 23 is omitted in the area of ​​the ceiling panel material 18 that overlaps with the upper floor support portion 11b in a plan view.

[0058] In addition, the third moisture-proof member 24 prevents humid air from flowing in from other areas into the area of ​​the attic 3 that overlaps with the roof component 11a, thereby suppressing condensation in the area of ​​the attic 3 that overlaps with the roof component 11a.

[0059] In the building 1 according to this embodiment, the first moisture-proof member 21 has thermal insulation properties, and the first beam 4a is provided closer to the ventilation section 12h than the first moisture-proof member 21. For example, when the first beam 4a is cooled by the influence of the temperature from inside the room through the attic 3, condensation may occur on the surface of the first beam 4a when the humid warm air flowing in from the ventilation section 12h touches the cooled first beam 4a. However, in this embodiment, the first moisture-proof member 21 having thermal insulation properties is interposed between the attic 3 and the first beam 4a, and the first beam 4a is prevented from being cooled by the influence of the temperature of the attic 3 leading from inside the room, so that condensation on the surface of the first beam 4a can be suppressed.

[0060] In the structure 1 according to this embodiment, the waterproof member 17 can prevent the roof board material 11 from getting wet by rain. Therefore, it is possible to prevent rain from penetrating the roof board material 11 and causing humid air to flow into the attic 3, which can cause condensation.

[0061] (Modification) In this embodiment, the first heat insulating member 13 has only a portion (heat insulating extension portion) that extends along the roof constituent portion 11a, and the first heat insulating member 13 is not provided on the underside of the upper floor supporting portion 11b. However, the first heat insulating member 13 may also be provided on the underside of the upper floor supporting portion 11b.

[0062] Furthermore, although the building according to this embodiment has an upper floor 6 provided alongside the roof 2, it is not necessary to provide an upper floor 6. In this case, since the entire attic 3 is to be blocked from the opening 12h1, the first moisture-proof member 21 can be provided so as to surround the attic 3 along the entire length of the opening 12h1.

[0063] In Figure 1, the first moisture-proof member 21, the third moisture-proof member 24 and the fourth moisture-proof member 25 are shown to be arranged to cover the surface of the fire-resistant covering material 5 arranged around the beam 4 for the convenience of spraying application, but the first moisture-proof member 21, the third moisture-proof member 24 and the fourth moisture-proof member 25 may also be arranged at a location away from the beam 4 and the fire-resistant covering material 5. [Explanation of symbols]

[0064] 1 building 2. Roof 3. Attic 4 beams 4a First beam (beam) 6 Upper Floors 11 Roofing Sheets 11a Roof components 11b Upper floor support 12a Wall part (wall member) 12h Ventilation section 12h1 opening 13 First heat insulating member (heat insulating member, heat insulating extension part) 14 Second insulation member (insulation member) 15 Board material 17 Waterproofing materials 18 Ceiling Panels 21 First moisture-proof member 23 Second moisture-proofing material 23a Moisture-proof extension 24 Third moisture-proofing material

Claims

1. A structure, A roof sheet material for forming a roof; A ceiling board material for forming a ceiling, the ceiling board material being provided below and spaced from the roof board material so that an attic is formed below the roof board material; a wall member having an internal ventilation portion extending from below to above and an opening provided in a region between the roof plate material and the ceiling plate material; a heat insulating member provided along the roof plate material and having moisture resistance; A first moisture-proof member that blocks the attic from the opening of the ventilation section; a second moisture-proof member provided along the ceiling board material.

2. The heat insulating member is provided along the lower surface of the roof panel, The structure of claim 1 , further comprising a waterproofing member disposed along an upper surface of the roofing sheet material.

3. A structure comprising: A roof sheet material for forming a roof; A ceiling board material for forming a ceiling, the ceiling board material being provided below and spaced from the roof board material so that an attic is formed below the roof board material; a wall member having an internal ventilation portion extending from below to above and an opening provided in a region between the roof plate material and the ceiling plate material; A first moisture-proof member that blocks the attic from the opening of the ventilation section, The roof sheet material has a roof constituent part that constitutes the roof, and an upper floor support part that supports an upper floor adjacent to the roof constituent part, The building further includes a third moisture-proof member that divides the area below the roof panel into an area that overlaps the roof component in a planar view and an area that overlaps the upper floor supporting portion in a planar view.

4. The building structure according to claim 1 , wherein the first moisture-proof member is provided between the roof panel and the ceiling panel.

5. The building further includes a beam supporting the roof board on the ventilation section side of the first moisture-proof member, The structure according to claim 1 , wherein the first moisture-proof member has thermal insulation properties.

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