Ceiling underlayment components, ceiling structure, building, and building construction method

Abstract

To provide a ceiling base member capable of improving workability for attaching an airtight member so as to straddle between ceiling joist receivers.SOLUTION: A ceiling base member for a building comprises: a ceiling joist receiver which extends in a first direction and to which a hanging member can be connected; and a base airtight member having a covering portion adhered to an upper surface of the ceiling joist receiver via an adhesive layer so as to cover the whole of the upper surface of the ceiling joist receiver and at least one extension portion extending from the covering portion in at least one of second directions perpendicular to the first direction and extending in the first direction along the covering portion.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a ceiling underlayment member, a ceiling structure, a building, and a method for constructing a building. [Background technology]

[0002] 2. Description of the Related Art In the past, in buildings with attics, airtight sheets or moisture-proof sheets (hereinafter collectively referred to as "airtight sheets") have been installed along the upper surface of ceiling boards to make the interior airtight from outside air.

[0003] In such buildings, when wiring such as ducts and electric wires is installed on the ceiling board and the airtight sheet, it is necessary to make holes in the airtight sheet in multiple places to introduce the wiring into the room. Therefore, these holes reduce the airtightness of the room, and in winter, there is a risk that humid air will flow out from the room onto the airtight sheet, and the humid air will cool on the airtight sheet, causing condensation.

[0004] Here, a building has been proposed in the past in which a gap is formed between the ceiling board and the airtight sheet. For example, Patent Document 1 discloses a building that includes multiple joist supports (a suspension beam provided between two joists), joists provided on the underside of the joist supports, a ceiling board provided on the underside of the joists, and a sheet provided so as to straddle the upper surfaces of the multiple joist supports, and in which a gap is formed between the ceiling board and the sheet.

[0005] In such a building, wiring can be provided between the ceiling board and the airtight sheet. When wiring is provided between the ceiling board and the airtight sheet, the number of holes to be provided in the airtight sheet when introducing the wiring into the room can be reduced.

[0006] On the other hand, when wiring between the ceiling board and the airtight sheet is led to the outside of the airtight sheet, holes must be drilled in the airtight sheet. However, since the wiring provided on the ceiling board generally has a larger portion led to the inside of the room than to the outside of the airtight sheet, the configuration described in Patent Document 1 can reduce the number of holes to be drilled in the airtight sheet compared to the case where the airtight sheet is provided along the upper surface of the ceiling board, and can maintain a good airtight state in the room. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 9-111946 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the building disclosed in Patent Document 1, the joist supports are attached using a special construction method.

[0009] Specifically, when constructing the building disclosed in Patent Document 1, a sheet with multiple joist supports attached parallel to the bottom surface is prepared in advance, and the sheet is folded into a corrugated shape to gather the joist supports. The gathered joist supports together with the sheet are supported on the joist attached to the wall. Next, the sheet is stretched to move the joist supports along the joist, and the joist supports are arranged at a specified interval.

[0010] In this way, the building disclosed in Patent Document 1 requires that multiple furring strip supports gathered together with the sheet be lifted up onto the furring strip during construction, which makes construction difficult.

[0011] The present invention has been made in consideration of such problems, and aims to provide a ceiling base member that can improve workability when installing an airtight sheet (airtight member) so as to span between joist supports. It also aims to provide a ceiling structure and a building that have such a ceiling base member, and to provide a construction method for a building that is easy to work with. [Means for solving the problem]

[0012] As a result of extensive investigations, the present inventors have found that the above object can be achieved by the following invention.

[0013] A ceiling underlayment component according to one aspect of the present invention is a ceiling underlayment component for a building, and comprises an underlayment airtight component extending in a first direction and having a soffit support to which a hanging member can be connected, a covering portion adhered to the upper surface of the soffit support via an adhesive layer so as to cover the entire upper surface of the soffit support, and at least one extension portion extending from the covering portion in at least one second direction perpendicular to the first direction and extending in the first direction along the covering portion.

[0014] In addition, a construction method for a building according to another aspect of the present invention is a construction method for a building using the above-mentioned ceiling substructure components, comprising the steps of attaching two of the hanging members to predetermined positions in the building, connecting each of the two hanging members to the sill support before or after the step of attaching the two hanging members, and providing an inter-substrate airtight member between the substrate airtight member of one of the two ceiling substructure components that extend in the first direction and are spaced apart from each other in the second direction by the steps of attaching the two hanging members and connecting them to the sill support.

[0015] In the above-mentioned ceiling foundation member, since the entire upper surface of the joist support is covered by the covering part, an airtight line can be formed between the two ceiling foundation members by attaching an inter-foundation airtight member so as to straddle the foundation airtight members of the two ceiling foundation members suspended by the hanging member at a distance from each other in the second direction. Therefore, compared to the case in which a plurality of joist supports gathered together with the sheet are lifted up onto the joist as in the building disclosed in Patent Document 1, the workability of attaching the airtight member so as to straddle the joist supports can be improved.

[0016] Furthermore, since the base airtight member has an extension portion extending in at least one of the second directions, when attaching the base airtight member to the ceiling base member, the base airtight member can be easily attached to the extension portion away from the hanging member.

[0017] Furthermore, if a side airtight member is attached to the base airtight member so that it extends from one of the two ceiling base members to the opposite side of the other ceiling base member, the airtight line can also be extended in the direction in which the two ceiling base members move away from each other.

[0018] In addition, with the above-mentioned ceiling underlayment component, the adhesive layer allows the underlayment airtight component to be kept attached in a designated position on the furring strip support, eliminating the need for workers to hold the underlayment airtight component in a designated position on the furring strip support, thereby improving the ease of construction for connecting the ceiling underlayment component to the hanging component.

[0019] In the above-mentioned ceiling underlayment component, the soffit support has an upper surface on which a connectable portion to which the hanging member can be connected is formed, and the covering portion may be adhered to the upper surface of the soffit support so as to cover the connectable portion in a state in which a through hole leading to the connectable portion can be formed.

[0020] In this embodiment, by providing a through hole in the connected portion of the base airtight component, the siding support can be easily connected to the hanging component.

[0021] In the above ceiling underlayment component, the underlayment airtight component may have two of the extension portions extending from the covering portion on both sides in the second direction.

[0022] In this aspect, the airtight member can be connected to the base airtight member at a position away from the hanging member on both sides in the second direction of the covering portion of the base airtight member, thereby improving the ease of installation when attaching an airtight member (e.g., an inter-base airtight member) to the base airtight member.

[0023] A ceiling structure according to another aspect of the present invention is a ceiling structure for a building, comprising two of the hanging members, two ceiling base members as described in claim 1 or claim 2 extending in the first direction and arranged at a distance in the second direction and suspended by each of the two hanging members, a plurality of sills extending in the second direction and connected to the lower part of the sill support and having ceiling panel material attached thereto, and an inter-base airtight member provided between the base airtight member of one of the ceiling base members and the base airtight member of the other ceiling base member.

[0024] For two ceiling foundation members in which an airtight member (inter-foundation airtight member) is connected to a foundation airtight member with high workability as described above, an airtight line can be extended in a second direction by further providing a side airtight member extending from the foundation airtight member of one of the ceiling foundation members to the opposite side of the other ceiling foundation member. The side airtight member may be connected to another adjacent ceiling foundation member, or may be connected to an airtight layer provided on a wall body. Specifically, the side airtight member can be connected to the airtight layer provided on a wall body by the following configuration.

[0025] A building according to another aspect of the present invention has the above-mentioned ceiling structure and a wall body provided below the ceiling structure and having an airtight layer, wherein the ceiling structure further has a side airtight member provided to extend from the base airtight member of one of the ceiling base members to the opposite side of the other ceiling base member, and an end of the side airtight member in the second direction opposite the end connected to the base airtight member is connected to the airtight layer.

[0026] In the above-mentioned building, the airtight layer of the wall body and the side airtight member can be connected in the second direction.

[0027] In the above-mentioned building, the airtight layer of the wall body may include a connecting member having an airtight sheet provided along the wall body, a wall-side connection portion extending upward from the upper end of the airtight sheet, and a ceiling-side connection portion extending toward the interior of the room from a portion of the wall-side connection portion above the lower surface of the soffit support and connected to the side airtight member.

[0028] According to this aspect, at least one end of the side airtight member in the second direction can be positioned above the soffit (above the lower surface of the soffit support), thereby ensuring space for arranging wiring, etc. between the side airtight member and the ceiling panel material. Effect of the Invention

[0029] According to the present invention, it is possible to provide a ceiling base member that can improve the ease of installation for installing an airtight member so as to span between joist supports. In addition, according to the present invention, it is possible to provide a ceiling structure and a building having such a ceiling base member, and to provide a method of installing a building with high ease of installation. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a schematic diagram of a cross-sectional view of a building according to one embodiment of the present invention, as viewed from a first direction. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of a portion surrounded by a dashed line II in FIG. [Diagram 3] FIG. 3 is an enlarged cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a perspective view showing the ceiling structure of the roof part of the building shown in FIG. 1 as viewed from below. [Diagram 5] FIG. 5 is an exploded perspective view of the ceiling underlayment member shown in FIG. [Figure 6] FIG. 6 is a perspective view showing the upper end of a portion of the wall of the roof portion shown in FIG. 3 extending in the second direction and its periphery as viewed from below. [Figure 7] FIG. 7 is a perspective view showing the upper end of a portion of a wall of the roof portion shown in FIG. 2 extending in a first direction and its periphery as viewed from below. [Figure 8] FIG. 8 is a diagram showing the state during construction of the ceiling structure shown in FIG. 4, and is a perspective view looking up from below showing the state in which the rough girders have been attached to the ceiling foundation members. [Figure 9] FIG. 9 is a perspective view showing a state in which an inter-substrate airtight member is attached to the substrate airtight member in the ceiling substrate member shown in FIG. 8, and a state in which a side airtight member is attached. [Figure 10] FIG. 10 is a perspective view showing a state in which reinforcing tapes are attached between the base airtight member and the inter-base airtight members and the side airtight members shown in FIG. [Figure 11] FIG. 11 is a perspective view showing a state in which a reinforcing tape is attached between the ceiling-side connecting portion of the connecting member shown in FIGS. 5 and 6 and the side airtight member shown in FIG. [Figure 12] FIG. 12 is a perspective view showing a state in which wiring on an inter-substrate airtight member is introduced into a room. [Figure 13] FIG. 13 is a perspective view showing a state in which the inter-substrate airtight member has been repaired. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, a ceiling underlayment member, a ceiling structure, a building, and a method of constructing a building according to one embodiment of the present invention will be described with reference to the drawings.

[0032] In this embodiment, the normal direction to the paper surface of Fig. 1 is defined as a first direction X, and the direction perpendicular to the horizontal direction to the first direction X is defined as a second direction Y. Of the first direction X, the direction into the paper surface of Fig. 1 is defined as the +X direction, and the direction toward the viewer is defined as the -X direction, and of the second direction Y, the right direction in Fig. 1 is defined as the +Y direction, and the left direction is defined as the -Y direction.

[0033] Fig. 1 is a schematic diagram of a cross-section of a building according to this embodiment as viewed from a first direction, and Fig. 2 is an enlarged cross-sectional view of a portion surrounded by a dashed line II in Fig. 1. Fig. 3 is an enlarged cross-sectional view taken along line III-III in Fig. 1. Fig. 4 is a perspective view of the ceiling structure of the roof part of the building shown in Fig. 1 as viewed from below, and Fig. 5 is an exploded perspective view of the ceiling foundation member shown in Fig. 4.

[0034] As shown in Fig. 1, the building 1 is a two-story house having a lower roof section 1a with a first floor space formed under the roof, and a total two-story section 1b with a first floor space and a second floor space formed under the roof, and has an airtight line 2 that is installed to enclose the entire interior of the building 1. The airtight line 2 is formed by connecting airtight members such as airtight sheets installed on the ceiling structure 30 in the lower roof section 1a, the second floor ceiling structure 1b1 in the total two-story section 1b, walls such as the wall 50 of the lower roof section 1a that surrounds the periphery of the rooms of the building 1 and the second floor wall 60 of the total two-story section 1b, and the floor 1c of the first floor.

[0035] The building 1 has a structural body and an auxiliary member attached to the structural body.

[0036] As shown in Figs. 1 to 3, the structural framework has a plurality of beams (only two beams 3a and 3b are shown in Figs. 1 and 2) extending in a first direction X at the upper part of the ceiling structure 30 of the lower roof section 1a, and a plurality of beams (only one beam 3c is shown in Fig. 3) extending in a second direction Y at the upper part of the ceiling structure 30. The beam 3a extends in the first direction X on the wall 50 of the lower roof section 1a. The beam 3b extends in the first direction X at the boundary between the lower roof section 1a and the total second floor section 1b (below the wall 60 of the second floor of the total second floor section 1b) and faces the beam 3a in the second direction Y. Although not shown, at least one beam extending in the first direction X is provided between the beam 3a and the beam 3b. As shown in Fig. 3, the beam 3c extends in the second direction Y so as to connect the beam 3a and the beam 3b. Hereinafter, beams 3a to 3c and beams not shown will be collectively referred to as beam 3. Beam 3 is made of H-shaped steel. Note that beam 3 may be made of a member other than H-shaped steel (e.g., a square timber) as long as it is possible to connect hanging members 4 (described later).

[0037] 1 to 3, the attached member has a ceiling structure 30 of the lower roof section 1a, a wall body 50 of the lower roof section 1a, and a wall body 60 of the second floor in the two-story section 1b. The wall body 50 of the lower roof section 1a has an X portion 50a extending in a first direction X shown in Figs. 1 and 2, and a Y portion 50b extending in a second direction Y shown in Fig. 3.

[0038] As shown in Figures 2 and 4, the ceiling structure 30 comprises a plurality of hanging members 4 suspended from a plurality of beams 3, a plurality of ceiling substructure members 10 extending in a first direction X and arranged at a distance in a second direction Y, each suspended by the hanging members 4, a joist 31 attached to the lower part of the ceiling substructure members 10, an inter-substrate airtight member 14 provided between the ceiling substructure members 10, a plurality of side airtight members 15 provided so as to extend from one ceiling substructure member 10 to the opposite side of the other ceiling substructure member 10, a beam side airtight sheet 16 provided so as to extend upward from the end of the side airtight member 15 on the beam 3b side (+Y direction side), a ceiling panel material 32 provided on the underside of the joist 31, and an insulating material 35 provided on the ceiling substructure members 10, the inter-substrate airtight member 14 and the side airtight member 15.

[0039] As shown in Fig. 2, the hanging member 4 is attached to a beam 3b at the boundary between the lower roof section 1a and the second floor section 1b, and to a beam 3 (not shown) between the beams 3a and 3b. The inter-substrate airtight member 14 includes an airtight member provided between the hanging member 4 shown in Fig. 2 and a hanging member 4 (not shown), and the side airtight member 15 includes an airtight member extending from the hanging member 4 (not shown) to the wall body 50 and an airtight member extending from the hanging member 4 shown to the beam-side airtight sheet 16.

[0040] 2 and 5, the hanging member 4 has a hanging rod 4a with a male thread formed on its surface, two fixing members 4b with female threads that can be attached to the hanging rod 4a and screwed to the hanging rod 4a, and a support member 4c that is attached to the lower flange of the beam 3b and supports the upper end of the hanging rod 4a. The support member 4c may be attached to the upper flange of the beam 3b.

[0041] As shown in Figure 5, the ceiling underlayment member 10 has a sill support 11 extending in a first direction X, a sublayment airtight member 12 provided on the upper surface 11b1 of the sill support 11, and a sill fixing member 13 for connecting the sill support 11 and the sill 31.

[0042] The siding support 11 has a top plate 11b, a bottom plate 11c, and a side plate 11d that connects the top plate 11b and the bottom plate 11c. The siding support 11 has an upper surface 11b1 to which a hanging member 4 can be connected and in which a plurality of holes 11a (connected portions) are formed to connect the hanging member 4. Specifically, the top plate 11b has a plurality of holes 11a that penetrate the top plate 11b in the vertical direction. The hanging rod 4a extends from above the top plate 11b to below the top plate 11b through the holes 11a, and the top plate 11b is sandwiched between a fixing member 4b provided on the top plate 11b and a fixing member 4b provided below the top plate 11b, so that the hanging rod 4a is fixed to the siding support 11. The top plate 11b and the bottom plate 11c are connected by the side plate 11d at the end on the +Y direction side of the second direction Y. A sill fixing member 13 is attached to the bottom plate 11c.

[0043] The base airtight member 12 has a covering portion 12a adhered to the upper surface 11b1 of the soffit support 11, and an extending portion 12b extending from the covering portion 12a on both sides in a second direction Y perpendicular to the first direction X and extending in the first direction X along the covering portion 12a.

[0044] The base airtight member 12 is an airtight member, and is made of, for example, a foamed sheet. An adhesive layer 12a2 is provided on the surface of the covering portion 12a that is to be bonded to the soffit receiver 11. Before bonding the covering portion 12a to the soffit receiver 11, the adhesive layer 12a2 is covered with a release paper 12d. The covering portion 12a is bonded to the soffit receiver 11 with the release paper 12d peeled off.

[0045] The covering portion 12a is bonded to the upper surface 11b1 of the siding support 11 via an adhesive layer 12a2 so as to block the multiple holes 11a in the upper surface 11b1 of the siding support 11 and to cover the entire upper surface 11b1 of the siding support 11. The material and thickness of the covering portion 12a are set so that when an operator pushes the end of the hanging rod 4a into the covering portion 12a from the portion above the hole 11a of the siding support 11, a through hole 12a1 communicating with the hole 11a can be formed. The covering portion 12a is preferably made of a polyethylene foam material, for example, and has a thickness of 1 to 4 mm.

[0046] As shown in Fig. 5, in the portion of the ceiling foundation member 10 that is suspended by the suspension member 4, the covering portion 12a is formed with a through hole 12a1 that communicates with the hole 11a in the upper surface 11b1 of the joist support 11. The covering portion 12a is also clamped by the fixing member 4b in a state where it is in close contact with the top plate 11b of the joist support 11. This restricts the flow of gas between the covering portion 12a and the top plate 11b.

[0047] The through hole 12a1 may be formed before the ceiling foundation member 10 having the foundation airtight member 12 attached to the joist support 11 is delivered to the construction site of the building 1, or may be formed at the construction site of the building 1. In the portion of the covering portion 12a facing the hole 11a that is not suspended by the suspension member 4, the through hole 12a1 is not formed, and the covering portion 12a maintains a state in which the hole 11a is covered.

[0048] The inter-substrate airtight member 14, the side airtight member 15, and the beam-side airtight sheet 16 are all airtight members, for example, sheets made of soft resin. The inter-substrate airtight member 14, the side airtight member 15, and the beam-side airtight sheet 16 can all be made of sheets of the same material.

[0049] As shown in Fig. 4, the inter-substrate airtight member 14 is provided between two ceiling substrate members 10 aligned in the second direction Y. The side airtight members 15 include one (hereinafter referred to as -Y side airtight member 15A) extending from the ceiling substrate member 10 on the -Y direction side of Fig. 4 toward the wall body 50 side (-Y direction), and one (hereinafter referred to as +Y side airtight member 15B) extending from the ceiling substrate member 10 on the +Y direction side of Fig. 4 toward the wall body 60 side (+Y direction).

[0050] 2, the -Y side airtight member 15A extends in the -Y direction and is connected to a connecting member 55 (described later) of the wall body 50. The +Y side airtight member 15B extends to a position on the +Y direction side of the beam 3b at the boundary between the lower roof section 1a and the second floor section 1b. The beam side airtight sheet 16 is connected to the +Y side airtight member 15B with adhesive tape or adhesive, and extends upward to the floor body 70 (described later).

[0051] In this embodiment, the inter-substrate airtight member 14 and the side airtight member 15 are both attached to the extension portion 12b of the base airtight member 12. Specifically, the inter-substrate airtight member 14 and the side airtight member 15 are attached to the extension portion 12b via an adhesive layer provided on the upper surface of the extension portion 12b. In this manner, the base airtight member 12, the inter-substrate airtight member 14, and the side airtight member 15 are connected to each other, and together with the beam-side airtight sheet 16, they form a part of the airtight line 2 in the ceiling structure 30 of the lower roof portion 1a. The inter-substrate airtight member 14 and the side airtight member 15 may be attached to the extension portion 12b by an adhesive. In addition, when there is no attic space above the ceiling structure 30 or the space is narrow, it is preferable that the inter-substrate airtight member 14 and the side airtight member 15 are attached to the lower surface of the extension portion 12b. In this case as well, the inter-substrate airtight member 14 and the side airtight member 15 can be attached to the extending portion 12b by an adhesive layer or adhesive provided on the lower surface of the extending portion 12b.

[0052] In the ceiling structure of this embodiment, as shown in Fig. 4 and Fig. 10 described later, a reinforcing tape 17a is provided so as to straddle the base airtight member 12 and the base airtight member 14, thereby ensuring airtightness between the base airtight member 12 and the base airtight member 14. The reinforcing tape 17a is also provided for the base airtight member 12 and the side airtight member 15. When attaching the base airtight member 14 and the side airtight member 15 to the lower surface of the extension portion 12b, the reinforcing tape 17a can be omitted if sufficient attachment strength can be ensured by utilizing the adhesive layer provided on the lower surface of the extension portion 12b.

[0053] 2 to 4, the siding 31 is a rectangular tubular member extending in the second direction Y, and has a fitted portion 31a provided near the upper end. The siding 31 is attached to the lower part of the siding support 11 by fitting the siding fixing member 13 into the fitted portion 31a.

[0054] The insulation material 35 is a soft fiber-based insulation material made of glass wool or the like, and is provided along the ceiling panel material 32 above the inter-substrate airtight member 14 and the side airtight member 15, from the beam 3a to a position between the beam 3b and the beam-side airtight sheet 16.

[0055] The ceiling board material 32 is a board material made of gypsum board or the like, and is attached to the underside of the joist 31 by screws or the like (not shown).

[0056] The insulation material 35 is a soft fiber-based insulation material made of glass wool or the like, and is provided along the ceiling panel material 32 above the inter-substrate airtight member 14 and the side airtight member 15, from the beam 3a to a position between the beam 3b and the beam-side airtight sheet 16.

[0057] In addition, in the ceiling structure 30 portion of the building 1 of this embodiment, as shown in Figures 2 and 4, wiring 81 is provided between the joist 31 and the inter-substrate airtight member 14 or the side airtight member 15, i.e., inside the airtight line 2.

[0058] Next, the wall 50 of the lower roof portion 1a will be described. As described above, the wall 50 of the lower roof portion 1a has an X portion 50a (see FIG. 2) extending in the first direction X and a Y portion 50b (see FIG. 3) extending in the second direction Y.

[0059] As shown in Fig. 2, the X portion 50a includes an inner wall frame 52 having horizontal bars 52a and vertical bars 52b, an airtight sheet 54 provided along the indoor surface (+Y direction surface) of the inner wall frame 52, an inner wall panel material 51 provided along the indoor surface of the airtight sheet 54, a connecting member 55 connected to the upper end of the airtight sheet 54, an inner wall runner 57 (see also Fig. 7 described later) provided on the indoor side of the connecting member 55 for positioning the end of the joist 31, a frame 59 provided below the beam 3a, an outer wall panel material 50c provided along the outdoor surface (-Y direction surface) of the frame 59, and a fiber-based heat insulating material 56 made of glass wool or the like provided between the inner wall frame 52 and the outer wall panel material 50c. The airtight sheet 54 and the connecting member 55 are connected to each other to form an airtight layer of the wall body 50, that is, a part of the airtight line 2. As shown in FIG. 3, the Y portion 50b has a similar configuration to the X portion 50a, except for the inner wall runner 57.

[0060] The connection member 55 has a wall-side connection part 55a extending upward from the upper end of the airtight sheet 54, and a ceiling-side connection part 55b extending from a portion of the wall-side connection part 55a above the lower surface of the joist support 11 toward the indoor side (+Y direction) and connected to the side airtight member 15. This connects the wall body 50 part of the shingle part 1a of the airtight line 2 to the ceiling structure 30 part.

[0061] The inner wall runner 57 extends in the first direction X and opens in the second direction Y, and has a groove into which the end of the siding 31 is inserted.

[0062] Next, the second floor wall 60 and its surroundings in the second floor section 1b will be described. As shown in Fig. 2, the second floor section 1b has a second floor wall 60 and a second floor floor 70 provided on the beams 3b at the boundary between the lower section 1a and the second floor section 1b.

[0063] The floor body 70 has a plate-shaped floor material 71 supported by the beams 3b at its outdoor end (the end on the -Y direction side), and a floor material airtight sheet 72 provided from the upper surface to the lower surface of the floor material 71 so as to cover the outdoor end of the floor material 71. The floor material airtight sheet 72 is connected at its lower portion to the upper end of the beam-side airtight sheet 16.

[0064] The wall 60 on the second floor includes an inner wall frame 62 provided on the floor 70, an airtight sheet 63 provided along the indoor surface (+Y direction surface) of the inner wall frame 62 and connected to the floor material airtight sheet 72, an inner wall board material 64 provided along the indoor surface of the airtight sheet 63, a frame 65 provided above the beams 3b, and a fiber-based heat insulating material 66 made of glass wool or the like provided along the outdoor surface (-Y direction surface) of the inner wall frame 62. The lower end of the airtight sheet 63 is connected to the upper part of the floor material airtight sheet 72. In this way, the airtight sheet 63 and the floor material airtight sheet 72 are connected in order to form a part of the airtight line 2 from the ceiling structure 30 part of the lower house 1a to the wall 60 part on the second floor.

[0065] Next, a method for constructing a ceiling structure and a building 1 using the ceiling foundation member 10 according to this embodiment will be described.

[0066] The construction method according to this embodiment includes the following steps (1) to (9). In step (1), two hanging members 4 are attached to a predetermined position in a building. In step (2), the two hanging members 4 are connected to the joist support 11 with the hanging members 4 penetrating the base airtight member 12. In step (3), a connection member 55 and an inner wall runner 57 are attached to the upper end portion of the wall body 50. In step (4), a joist 31 is attached to the ceiling base member 10. In step (5), a heat insulating material 35 is placed on the ceiling base member 10 and the joist 31. In step (6), a wiring 80 connected to a power line is placed on the heat insulating material 35. In step (7), a wiring 81 is placed between the heat insulating material 35 and the joist 31. In step (8), an inter-substrate airtight member 14 is provided between the substrate airtight member 12 of one ceiling substrate member 10 and the substrate airtight member 12 of the other ceiling substrate member 10. In step (9), a side airtight member 15 is attached to one ceiling substrate member 10 so as to extend from the substrate airtight member 12 of one ceiling substrate member 10 to the opposite side of the other ceiling substrate member 10.

[0067] Fig. 6 is a perspective view showing the upper end and its periphery of Y portion 50b of wall body 50 shown in Fig. 3, and Fig. 7 is a perspective view showing the upper end and its periphery of X portion 50a shown in Fig. 2, when viewed from below. Fig. 8 is a perspective view showing the ceiling structure shown in Fig. 4 in the middle of construction, looking up from below after joists 31 have been attached to ceiling foundation member 10.

[0068] In step (1), a plurality of hanging members 4 are attached to predetermined positions in a building. Specifically, the plurality of hanging members 4 are attached to predetermined positions of a beam 3 as shown in FIG.

[0069] In step (2), as shown in Figures 5 and 6, the multiple hanging members 4 attached to the beams 3 are each connected to the joist supports 11. Through steps (1) and (2), as shown in Figure 4, the multiple ceiling underlay members 10 extend in the first direction X and are arranged spaced apart from one another in the second direction Y.

[0070] In step (3), as shown in Figures 6 and 7, in both the X portion 50a and the Y portion 50b of the wall body 50, the connection members 55 are attached to the upper ends (cross bars 52a) of the inner wall frame 52 with screws 58. At this time, the connection members 55 are positioned so that the ceiling-side connection portion 55b extends into the room from the portion of the wall-side connection portion 55a of the connection member 55 that is above the lower surface of the joist support 11. Also, as shown in Figure 7, the inner wall runner 57 is attached to the X portion 50a of the wall body 50 with screws 58 in a state where the inner wall runner 57 is positioned at a height that is preset as a height for positioning the end of the joist 31.

[0071] In step (4), as shown in Figs. 6 and 8, a plurality of sidings 31 are attached to the underside of the siding support 11 of the wall body 50 or the ceiling foundation member 10 in a state in which they extend in the second direction Y and are arranged so as to be spaced apart in the first direction X. The sidings 31 at the end in the -X direction are attached to the Y part 50b of the wall body 50 by screws 58 as shown in Fig. 6. The other sidings 31 are attached to the underside of the siding support 11 of the ceiling foundation member 10 via the siding fixing member 13 as shown in Fig. 8. The end of the sidings 31 in the second direction Y is inserted into the groove of the inner wall runner 57 as shown in Fig. 2. The end of the ceiling foundation member 10 in the -X direction is disposed between the sidings 31 attached to the Y part 50b and the ceiling side connection part 55b of the connection member 55.

[0072] In step (5), as shown in FIG. 8, a heat insulating material 35 is placed on the ceiling underlayment component 10 and the joist 31.

[0073] In step (6), wiring 80 that is introduced from outside the building 1 and connected to a power transmission line is placed on top of the insulation material 35 that is placed on the joist 31.

[0074] In step (7), wiring 81 is placed between the insulation material 35 and the rafters 31 to be introduced into the room.

[0075] Fig. 9 is a perspective view showing a state where the base airtight member 14 is attached to the base airtight member 12 and a state where the side airtight member 15 is attached in the ceiling base member 10 shown in Fig. 8. Fig. 10 is a perspective view showing a state where a reinforcing tape 17a is attached between the base airtight member 12 and the base airtight member 14 and the side airtight member 15 shown in Fig. 9. Fig. 11 is a perspective view showing a state where a reinforcing tape 17a is attached between the ceiling side connection part 55b of the connection member 55 shown in Figs. 5 and 6 and the side airtight member 15 shown in Fig. 9.

[0076] In step (8), after providing the joists 31 to the ceiling underlayment member 10, an inter-substrate airtight member 14 is provided between the substrate airtight member 12 of one adjacent ceiling underlayment member 10 and the substrate airtight member 12 of the other ceiling underlayment member 10, as shown in Fig. 9. The extension portion 12b of the substrate airtight member 12 and the inter-substrate airtight member 14 are connected via an adhesive layer provided on the upper surface of the extension portion 12b, and a reinforcing tape 17a is attached to the connection portion for reinforcement, as shown in Fig. 10.

[0077] In step (9), a side airtight member 15 is provided so as to extend from the base airtight member 12 of one ceiling base member 10 to the opposite side to the other ceiling base member 10. Of the ends of the side airtight member 15 opposite the base airtight member 12, the end on the +Y side is connected to the beam-side airtight sheet 16 as shown in FIG. 2, and the end on the -Y side is connected to the ceiling-side connection part 55b of the connection member 55.

[0078] At this time, the extension portion 12b of the base airtight member 12 and the side airtight member 15 are connected via an adhesive layer provided on the upper surface of the extension portion 12b, and a reinforcing tape 17a is attached to the connection portion for reinforcement, as shown in Fig. 10. Also, as shown in Fig. 11, the side airtight member 15 and the ceiling side connection portion 55b of the connection member 55 are connected via an adhesive layer provided on the lower surface of the ceiling side connection portion 55b, and a reinforcing tape 17b is attached to the connection portion. A reinforcing tape (not shown) is also attached to the connection portion between the side airtight member 15 and the beam side airtight sheet 16.

[0079] The order of steps (1) to (9) is not limited to the above order.

[0080] In the above-mentioned construction method, step (2) was performed after step (1). However, step (2) may be performed before step (1). Specifically, before attaching the hanging member 4 to the beam 3, the hanging member 4 may be connected to the joist support 11 of the ceiling foundation member 10, and then the hanging member 4 connected to the ceiling foundation member 10 may be attached to a predetermined location on the beam 3, and the two ceiling foundation members 10 may be arranged to extend in the first direction X and spaced apart from each other in the second direction Y.

[0081] Step (3) may be performed before step (1) and step (2). At least one of steps (4) to (7) may be performed after providing the inter-substrate airtight member 14 to the substrate airtight member 12 in step (8). Step (9) may be performed before step (8), or steps (8) and (9) may be performed simultaneously.

[0082] In addition, in steps (8) and (9), the inter-substrate airtight member 14 and the side airtight member 15 may be connected to the extension portion 12b or the ceiling-side connection portion 55b by an adhesive. The inter-substrate airtight member 14 and the side airtight member 15 may be connected to the lower surface of the extension portion 12b, and the side airtight member 15 may be connected to the upper surface of the ceiling-side connection portion 55b.

[0083] Through the above steps, as shown in Fig. 4, a ceiling structure 30 is formed having the hanging member 4, the ceiling foundation member 10, the joists 31, the foundation airtight member 14, and the side airtight member 15, and the insulation material 35, the wiring 80, and the wiring 81 are provided on the ceiling structure 30. Note that the wiring 80 is not shown in Fig. 4.

[0084] The wiring 81 is provided inside (indoor side) of the airtight line 2, and can be introduced into the room without breaking the airtight line 2. However, the wiring 81 alone is not supplied with power from a power transmission line outside the building 1. For this reason, it is necessary to introduce the wiring 80, which is supplied with power from a power transmission line outside the building 1 and is arranged on the insulation material 35 and the inter-substrate airtight member 14, inside (indoor side) of the airtight line 2 and connect it to the wiring 81 to supply power to the wiring 81.

[0085] 12 is a perspective view showing a state where the wiring 80 on the inter-substrate airtight member 14 is pulled into the room, and FIG. 13 is a perspective view showing a state where the inter-substrate airtight member 14 has been repaired. When the wiring 80 arranged on the heat insulating material 35 and the inter-substrate airtight member 14 is introduced into the room, the wiring 80 is introduced through a through hole provided in the heat insulating material 35 and the inter-substrate airtight member 14. As shown in FIG. 13, the through hole 14a provided in the inter-substrate airtight member 14 has a repair tape 82 attached around the through hole 14a across the inter-substrate airtight member 14 and the wiring 80, thereby ensuring the airtightness of the inter-substrate airtight member 14. The end of the wiring 80 introduced into the room is connected to one end of the wiring 81, thereby achieving power supply to the wiring 81.

[0086] 2 and 3, ceiling board material 32 is attached to the underside of joist 31 to complete ceiling structure 30 of building 1. When wiring 80 and wiring 81 are introduced into the room, they may be introduced by drilling holes in ceiling board material 32, or they may be introduced through inside wall body 50 and into interior wall board material 51 by drilling holes.

[0087] (Action, effect) 5, in the ceiling foundation member 10 according to the above embodiment, the foundation airtight member 12 has a through hole 12a1 in a portion where the hanging member 4 is connected (a portion that covers the hole 11a formed in the upper surface 11b1 of the siding support 11), so that the siding support 11 can be easily connected to the hanging member 4. Meanwhile, the holes 11a of the siding support 11 that are not used for connection to the hanging member 4 are blocked by the foundation airtight member 12, so that a decrease in airtightness due to these holes 11a can be prevented.

[0088] In addition, since the entire upper surface 11b1 of the siding support 11 is covered by the covering portion 12a, as shown in Fig. 4, by attaching the inter-substrate airtight member 14 so as to straddle the base airtight members 12 of the two ceiling base members 10 suspended by the hanging member 4 at a distance from each other in the second direction Y, an airtight line 2 can be formed between the two ceiling base members 10. Therefore, compared to the case in which a plurality of siding supports gathered together with sheets are lifted up together onto the siding as in the building disclosed in Patent Document 1, the workability of attaching the base airtight member 12 and the inter-substrate airtight member 14 so as to straddle the siding supports 11 can be improved.

[0089] Furthermore, since the base airtight member 12 has the extending portions 12b extending on both sides in the second direction Y, when attaching the base airtight member 14 between two ceiling base members 10, the base airtight member 14 can be easily attached to the extending portions 12b that are away from the hanging member 4. The same applies to the side airtight members 15.

[0090] Furthermore, as shown in Figure 5, the adhesive layer 12a2 allows the base airtight member 12 to be maintained in a fixed position on the soffit support 11, eliminating the need for workers to hold the base airtight member 12 in a fixed position on the soffit support 11, thereby improving the ease of construction for connecting the ceiling base member 10 to the hanging member 4.

[0091] In the above embodiment, the inter-substrate airtight member 14 and the lateral airtight member 15 can be connected to the base airtight member 12 at a position away from the hanging member 4 on both sides of the covering portion 12a of the base airtight member 12 in the second direction Y, thereby improving the ease of installation for attaching the inter-substrate airtight member 14 and the lateral airtight member 15 to the base airtight member 12 compared to the case where the covering portion 12a has the extension portion 12b only on one side in the second direction Y.

[0092] As described above, with high workability, the two ceiling base components 10 each having an inter-base airtight member 14 connected to the base airtight member 12 can be further fitted with a side airtight member 15 to extend the airtight line 2 in the second direction Y.

[0093] 2, the side airtight member 15 may be connected to an airtight layer (airtight sheet 54 and connecting member 55) provided on the wall body 50. Also, it may be connected to another adjacent ceiling underlay member 10.

[0094] In the building 1 according to the above embodiment, the airtight layer of the wall body 50 and the side airtight member 15 can be connected in the second direction Y.

[0095] In the building 1 of the above embodiment, at least one end of the side airtight member 15 in the second direction Y can be positioned above the soffit 31 (above the lower surface of the soffit support 11), thereby ensuring space for arranging wiring 81, etc. between the side airtight member 15 and the ceiling panel material 32.

[0096] In the construction method for the building 1 according to the above embodiment, the ceiling underlayment component 10 according to the above embodiment is used, so that the building 1 can be constructed with high workability.

[0097] (Modification) In the above embodiment, the adhesive layer 12a2 is provided only on the portion of one surface of the covering portion 12a of the airtight member for the base 12 that is bonded to the siding support 11, and the release paper 12d is provided to cover the adhesive layer 12a2, but the range of the adhesive layer 12a2 is not limited to this. For example, the adhesive layer may be provided on the entire one surface of the airtight member for the base 12, and the release paper may be provided on the portions of the adhesive layer that correspond to the covering portion 12a and the extending portion 12b. In this case, when the covering portion 12a is bonded to the upper surface 11b1 of the siding support 11, only the release paper 12d of the covering portion 12a is peeled off, and when the airtight member is attached to the extending portion 12b, the release paper of the extending portion 12b is peeled off, and the airtight member between the bases 14 or the side airtight member 15 can be attached to the extending portion 12b by the adhesive layer of the extending portion 12b.

[0098] In the above embodiment, the extension portion 12b extends from the covering portion 12a to both sides in the second direction Y, but it is sufficient that the extension portion 12b extends in at least one direction in the second direction Y. When the extension portion 12b extends only in one direction in the second direction Y, the inter-substrate airtight member 14 or the lateral airtight member 15 may be attached to the upper surface of the covering portion 12a on the side to which the extension portion 12b does not extend.

[0099] In the above embodiment, the hole 11a is provided only in the top plate 11b of the soffit support 11, and the top plate 11b is sandwiched by the fixing member 4b, but as shown by the two-dot chain line in Fig. 5, the hole 11a may also be provided in the bottom plate 11c, the hanging rod 4a may be passed through the holes 11a of both the top plate 11b and the bottom plate 11c, and the upper surface 11b1 of the top plate 11b and the lower surface of the bottom plate 11c may be sandwiched by the fixing member 4b. Even if the hole 11a is provided in the bottom plate 11c, only the top plate 11b may be sandwiched by the fixing member 4b. By providing the hole 11a in both the top plate 11b and the bottom plate 11c, the shape of the soffit support 11 becomes symmetrical on the top and bottom, and there is no need to distinguish between the top and bottom.

[0100] In the above embodiment, the airtight layer of the wall 50 has an airtight sheet 54 and a connecting member 55, but the airtight sheet 54 may be extended from the wall 50 to the ceiling structure 30 without providing the connecting member 55 and connected directly to the side airtight member 15.

[0101] In the above embodiment, a hole 11a is provided on the upper surface 11b1 of the soffit support 11 as a connecting portion that can connect the hanging member 4 to the soffit support 11, and a through hole 12a1 that communicates with the hole 11a is formed in the covering portion 12a of the base airtight member 12. However, the connecting portion is not limited to the hole 11a provided in the soffit support 11. In addition, the method of attaching the hanging member 4 to the connecting portion is not limited to the method of clamping the top plate 11b or the top plate 11b and the bottom plate 11c of the soffit support 11 with the fixing member 4b screwed to the hanging rod 4a that is passed through the hole 11a.

[0102] Specifically, as shown by the two-dot chain line in FIG. 5, the hanging member 4 may have a hanging rod 4d bent to bypass the base airtight member 12 in the -Y direction, and a clamping portion 4e provided at the lower end of the hanging rod 4d and capable of clamping the bottom plate 11c of the siding support 11. In this case, the bottom plate 11c of the siding support 11 has a connected portion that can be connected to the hanging member 4 by being clamped by the clamping portion 4e. The hanging rod 4d is arranged so as to pass through the connection portion between the extension portion 12b on the -Y direction side of the base airtight member 12 and the base airtight member 14 or the side airtight member 15. The hanging rod 4d may also be passed through a through hole provided in the base airtight member 14 or the side airtight member 15.

[0103] In the above-mentioned modified examples, the inter-substrate airtight member 14 or the side airtight member 15 may be attached to the upper surface of the extension portion 12b or may be attached to the lower surface of the extension portion 12b. [Explanation of symbols]

[0104] 1 Building 4 Suspension members (ceiling structure) 10 Ceiling underlayment materials 11. Nobori Uke 11a hole (connected part) 11b1 Top surface 11c Bottom plate (connected part) 12. Base airtight materials 12a Covering part 12a1 Through hole 12a2 adhesive layer 12b Extension 14 Substrate airtight components (ceiling structure) 15 Lateral airtight member (ceiling structure) 31 Rafter (ceiling structure) 32 Ceiling Panels 50 wall 54 Airtight sheet (airtight layer) 55 Connection material (airtight layer) 55a Wall side connection 55b Ceiling side connection X First Direction Y Second Direction

Claims

1. A ceiling underlayment member for a building, A sill support extending in a first direction and capable of connecting a hanging member; A ceiling underlayment component comprising: an underlayment airtight component having a covering portion adhered to the upper surface of the furring strip support via an adhesive layer so as to cover the entire upper surface of the furring strip support; and at least one extension portion extending from the covering portion in at least one second direction perpendicular to the first direction and extending in the first direction along the covering portion.

2. The sill support has an upper surface on which a connection portion to which the hanging member can be connected is formed, The ceiling underlayment component according to claim 1 , wherein the covering portion is adhered to the upper surface of the soffit support so as to cover the connected portion in a state in which a through hole leading to the connected portion can be formed.

3. The ceiling underlayment component according to claim 1 or 2, wherein the underlayment airtight component has two of the extension portions extending from the covering portion on both sides in the second direction.

4. A ceiling structure of a building, Two of the hanging members; Two ceiling underlayment components according to any one of claims 1 to 3, each extending in the first direction and spaced apart in the second direction and suspended by two of the suspension members; A plurality of siding members extending in the second direction and connected to a lower portion of the siding support and to which a ceiling panel material is attached; A ceiling structure comprising: an inter-substrate airtight member provided between the substrate airtight member of one of the ceiling substrate members and the substrate airtight member of the other ceiling substrate member.

5. A building, A ceiling structure according to claim 4; A wall body provided under the ceiling structure and having an airtight layer, The ceiling structure further includes a side airtight member extending from the base airtight member of one of the ceiling base members to the opposite side of the other ceiling base member, A building, wherein the end of the side airtight member in the second direction opposite the end connected to the base airtight member is connected to the airtight layer.

6. The building described in claim 5, wherein the airtight layer of the wall body comprises an airtight sheet provided along the wall body, a wall side connection portion extending upward from the upper end of the airtight sheet, and a connecting member having a ceiling side connection portion extending from a portion of the wall side connection portion above the lower surface of the soffit support toward the interior of the room and connected to the side airtight member.

7. A method for constructing a building using the ceiling underlayment member according to any one of claims 1 to 3, Attaching the two suspension members to a pre-determined location on a building; A step of connecting the two hanging members to the sill support respectively before or after the step of attaching the two hanging members; A construction method for a building, comprising a step of installing an inter-substrate airtight member between the substrate airtight member of one of the two ceiling substructure members that extend in the first direction and are arranged at a distance from each other in the second direction by a step of attaching the two hanging members and a step of connecting them to the sill support, and a step of providing an inter-substrate airtight member between the substrate airtight member of one of the ceiling substructure members and the substrate airtight member of the other ceiling substructure member.

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