Ceiling insulation installation method

Abstract

This improves the efficiency of work to improve the airtightness and insulation of building ceilings. [Solution] The ceiling insulation construction method includes a preparation step of preparing a first insulator 5A and a second insulator 5B, each of which includes an insulating material 51 having an underside, and an airtight film 52 having a covering portion 52a covering the entire underside and a first excess portion 52b1 extending outside the underside and attached to the insulating material 51; a support member installation step of installing a support member 3 at a predetermined installation location; a first support step of supporting the first insulator 5A on the support member 3; a second support step of supporting the second insulator 5B on the support member 3 with the first excess portion 52b1 of the second insulator 5B overlapping the covering portion 52a of the first insulator 5A from below; and a welding step of applying heat of a predetermined temperature or higher to the first excess portion 52b1 to melt the first excess portion 52b1 and weld it to the covering portion 52a of the first insulator 5A.

Description

[Technical Field]

[0001] The present invention relates to a ceiling insulation construction method for insulating the ceiling of a building. [Background technology]

[0002] As one method for insulating the ceiling of a building, for example, Patent Document 1 below discloses a method for attaching insulation to a ceiling framework space formed by a rafter and a base material. Specifically, in Patent Document 1, the insulation includes a mat and a moisture-proof film covering the underside of the mat. The moisture-proof film also has mounting support pieces that protrude outward from the four sides of the mat. When attaching the insulation to the framework space, the mat is inserted into the ceiling framework space, and the mounting support pieces that protrude from the mat are fixed to the rafter and base material using a staple gun. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-146937 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above Patent Document 1, the moisture-proof film covering the underside of the mat is fixed to the rafters and base material, which is thought to improve the airtightness of the ceiling insulation section. However, in the above Patent Document 1, in order to fix the mounting support pieces of the moisture-proof film to the rafters and base material, it is necessary to repeatedly drive staples at regular intervals using a staple gun, which leaves room for improvement in terms of work efficiency.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a ceiling insulation construction method that can improve the efficiency of work to improve the airtightness and insulation of the ceiling of a building. [Means for solving the problem]

[0006] In order to solve the above problem, a first invention is a ceiling insulation construction method for insulating the ceiling of a building, comprising: a preparation step of preparing a first insulating airtight member and a second insulating airtight member, each of which includes an insulating material having a lower surface that is placed toward the room, and an airtight film that has a covering portion that covers the entire lower surface and an excess portion that extends outward from the lower surface and is attached to the insulating material; a support member installation step of installing support members for supporting the first insulating airtight member and the second insulating airtight member in a predetermined installation location; a first support step of supporting the first insulating airtight member on the support member; a second support step of supporting the second insulating airtight member on the support member with the excess portion of the second insulating airtight member overlapping the covering portion of the first insulating airtight member from below; and a welding step of applying heat of a predetermined temperature or higher to the excess portion of the second insulating airtight member to melt the excess portion and weld it to the covering portion of the first insulating airtight member.

[0007] According to the first aspect of the present invention, when the second heat insulating and airtight member is attached adjacent to the first heat insulating and airtight member, the excess portion of the second heat insulating and airtight member is overlapped from below on the covering portion of the first heat insulating and airtight member, so that the excess portion of the second heat insulating and airtight member can be welded to the covering portion of the first heat insulating and airtight member simply by heating the excess portion. This makes it easy to form a continuous airtight line between two adjacent heat insulating and airtight members, and improves the efficiency of the work of improving the airtightness and insulation of the ceiling portion.

[0008] The second invention is the first invention, wherein the support member has a first support part that supports the insulating material of the first insulating airtight member from below, and the preparation process prepares the first insulating airtight member in which the airtight film is attached to the insulating material in a state in which the insulating material and the covering part can be separated to insert the first support part, and the first support process supports the first insulating airtight member on the support member with the first support part inserted between the insulating material and the covering part.

[0009] According to the second aspect of the present invention, the first support portion can be covered and hidden by the covering portion, and the first support portion can be prevented from being exposed below the first heat insulating airtight member.

[0010] The third invention is the second invention, wherein in the second support step, the second insulating airtight member is supported by the support member in a state where the excess portion of the second insulating airtight member overlaps from below with the first support portion and the covering portion overlapping from below with the first support portion.

[0011] According to the third invention, the first support portion and the covering portion covering it can be further covered with an excess portion of the second insulating and airtight member, and the excess portion can be welded to the covering portion of the first insulating and airtight member, thereby ensuring the formation of an airtight line at the location where the first support portion is provided.

[0012] The fourth invention is the first to third inventions, further including, prior to the second support step, a hanging member installation step of installing a hanging member for suspending a ceiling surface material under the first insulating airtight member and the second insulating airtight member, wherein the second support step supports the second insulating airtight member on the support member with a portion of the hanging member sandwiched between the insulating material of the first insulating airtight member and the insulating material of the second insulating airtight member, and further including, after the welding step, an attachment step of attaching another airtight film across the underside of the first insulating airtight member and the underside of the second insulating airtight member with the hanging member inserted.

[0013] It is difficult to overlap the airtight films of the first and second heat insulating and airtight members at the installation location of the hanging member. In contrast, according to the fourth invention, in which a separate airtight film through which the hanging member is inserted is attached to the underside of both heat insulating and airtight members, it is possible to ensure good airtightness around the hanging member. [Effects of the Invention]

[0014] As described above, the ceiling insulation construction method of the present invention can improve the efficiency of the work of increasing the airtightness and thermal insulation of the ceiling part of a building. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a bottom view of a ceiling portion of a building to which a ceiling insulation construction method according to a first embodiment of the present invention is applied, viewed from below. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a partially cutaway longitudinal sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a perspective view of the insulator as viewed obliquely from below. [Figure 5] FIG. 2 is a perspective view of the insulator as seen obliquely from above. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a longitudinal cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 3 is an enlarged cross-sectional view of a part of FIG. 2. [Figure 9] FIG. 2 is a perspective view showing the support member alone. [Figure 10] FIG. 10 is a view showing the hanging member attached to the beam. [Figure 11] FIG. 10 is a bottom view showing an enlarged view of the installation location of the hanging member. [Figure 12] 10 is a diagram showing the state in which the support member and the hanging member are attached to the beam. FIG. [Figure 13] 10A and 10B are diagrams illustrating a state in which the first insulator is supported by the support member. [Figure 14] 10A and 10B are diagrams illustrating a state in which a second insulator is supported by a support member. [Figure 15] FIG. 10 is a diagram showing a state in which the excess portion of the second insulator is heated. [Figure 16] FIG. 10 is a diagram showing a situation in which an additional airtight film is attached. [Figure 17] FIG. 10 is a view corresponding to FIG. 2 for explaining a second embodiment of the present invention. [Figure 18] FIG. 4 is a perspective view of a portion of the upper insulator as viewed obliquely from below. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following embodiments are examples that embody the present invention and are not intended to limit the technical scope of the present invention.

[0017] (1) First embodiment [Building structure] FIG. 1 is a bottom view of a ceiling portion of a building to which a ceiling insulation construction method according to a first embodiment of the present invention is applied, as viewed from below; FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1; and FIG. 3 is a partially cutaway longitudinal sectional view taken along line III-III in FIG. 1. In the first embodiment, the front, rear, left, right, top, and bottom directions are defined as shown in the figure, but this is merely an example and is not intended to limit the installation orientation of each component. As shown in FIGS. 1 to 3, the building in the first embodiment includes an upper floor underfloor member 1, multiple beams 2 arranged along the underside of the underfloor member 1, multiple support members 3 and multiple hanging members 4 attached to the undersides of the beams 2, multiple insulators 5 supported below the beams 2 by the support members 3, and a ceiling body 6 supported below the insulators 5 by the hanging members 4. Note that some of the insulators 5 are omitted from FIG. 1.

[0018] The underfloor material 1 is a structure that constitutes the floor of an upper floor (for example, the second floor), and is supported from below by beams 2. The underfloor material 1 includes a floor surface material placed on the beams 2. The floor surface material is made of, for example, lightweight aerated concrete such as ALC.

[0019] The beams 2 are structural members that extend in the front-to-rear direction (horizontal direction) along the underside of the underfloor material 1. The beams 2 are arranged so that they are lined up at approximately equal intervals in the left-to-right direction, which is perpendicular to the front-to-rear direction. In the first embodiment, the beams 2 are made of H-shaped steel having a pair of flanges 21 arranged opposite each other in the vertical direction and a web 22 that connects the central portions of both flanges 21. The upper flange 21 is fixed to the underside of the underfloor material 1 using bolts or the like.

[0020] The ceiling body 6 is a structure that constitutes the ceiling of a lower floor (for example, the first floor), and is arranged a predetermined distance below the underfloor material 1. An attic space S is formed between the underfloor material 1 and the ceiling body 6. Although details are omitted, the ceiling body 6 includes, for example, a ceiling underlayment including joist supports and joists fixed to the lower ends of the hanging members 4, and a ceiling panel fixed to the underside of the ceiling underlayment. In other words, the ceiling body 6 is arranged below the underfloor material 1 while being suspended from the hanging members 4. The ceiling body 6 corresponds to an example of a "ceiling surface material" in the present invention.

[0021] The multiple insulators 5 are components for improving the airtightness and thermal insulation between the underfloor material 1 and the ceiling body 6, and are laid out in the attic space S. In detail, the multiple insulators 5 are arranged below the beams 2 in the attic space S so as to be lined up without gaps in the front-to-back and left-to-right directions.

[0022] As shown in FIG. 1 , a representative one of the multiple insulators 5 is designated as a first insulator 5A. The insulator 5 on the left of the first insulator 5A is designated as a second insulator 5B, and the insulator 5 on the rear of the first insulator 5A is designated as a third insulator 5C. In other words, the multiple insulators 5 include the first insulator 5A, the second insulator 5B disposed adjacent to the left of the first insulator 5A, and the third insulator 5C disposed adjacent to the rear of the first insulator 5A. The first to third insulators 5A to 5C and the other insulators 5 basically have the same structure. The first insulator 5A is an example of a "first heat-insulating and airtight member" in the present invention, and the second insulator 5B is an example of a "second heat-insulating and airtight member" in the present invention. Hereinafter, when the first to third insulators 5A to 5C are referred to without any particular distinction, they will be simply referred to as "insulators 5."

[0023] 4 and 5 are perspective views showing the insulator 5 alone. Fig. 4 shows the insulator 5 as seen from diagonally below, and Fig. 5 shows the insulator 5 as seen from diagonally above. As shown in Figs. 4 and 5, the insulator 5 includes a rectangular parallelepiped insulating material 51 and an airtight film 52 covering the lower surface of the insulating material 51.

[0024] Any type of insulating material may be used as long as it has insulating properties, but in the first embodiment, a hard insulating material made of, for example, urethane foam is used as the insulating material 51. The insulating material 51 has four peripheral surfaces: a right surface 51a and a left surface 51b that face each other in the left-right direction, and a front surface 51c and a rear surface 51d that face each other in the front-rear direction. The insulating material 51 also has a bottom surface that faces the interior of the room and an upper surface on the opposite side.

[0025] The airtight film 52 is a flexible film made of a thermoplastic resin such as polyethylene, polypropylene, or polyvinyl chloride. The airtight film 52 is formed in a rectangular shape having an area larger than the lower surface of the heat insulating material 51, and is fixed to the lower surface of the heat insulating material 51 by adhesive so as to entirely cover the lower surface. In this adhesive state, a portion of the airtight film 52 extends to the outside of the lower surface of the heat insulating material 51. That is, the airtight film 52 integrally includes a covering portion 52a having a rectangular shape in a plan view and covering the entire lower surface of the heat insulating material 51, and an excess portion 52b having an L-shape in a plan view and extending from two orthogonal sides of the covering portion 52a to the outside of the lower surface of the heat insulating material 51. Specifically, the excess portion 52b includes a first excess portion 52b1 extending rightward (outward) beyond the right surface 51a of the heat insulating material 51, and a second excess portion 52b2 extending forward (outward) beyond the front surface 51c of the heat insulating material 51. 4 and 5, the excess portion 52b is shown in color, as in FIG.

[0026] The covering portion 52a has a first overlapped portion 52a1 at its left end, i.e., at the end opposite the first surplus portion 52b1 in the left-right direction. As will be described in detail later, this first overlapped portion 52a1 is an area that overlaps with the first surplus portion 52b1 of another insulator 5 adjacent in the left-right direction.

[0027] The covering portion 52a has a second overlapped portion 52a2 at its rear end, i.e., at the end opposite the second surplus portion 52b2 in the front-to-rear direction. As will be described in detail later, the second overlapped portion 52a2 is an area that overlaps with the second surplus portion 52b2 of another insulator 5 adjacent in the front-to-rear direction.

[0028] A first non-adhesive portion Q1 is formed in the first overlapping portion 52a1 of the covering portion 52a. A second non-adhesive portion Q2 is formed on the side edge of the covering portion 52a opposite the first non-adhesive portion Q1, i.e., the right end portion of the covering portion 52a. At these first and second non-adhesive portions Q1 and Q2, the airtight film 52 is not adhered to the lower surface of the thermal insulation material 51, allowing the two to separate. Conversely, the airtight film 52 is adhered to the lower surface of the thermal insulation material 51 in the area other than the first and second non-adhesive portions Q1 and Q2. In other words, the airtight film 52 is adhered to the lower surface of the thermal insulation material 51 only at the first and second non-adhesive portions Q1 and Q2 so that it can be separated from the lower surface. These first and second non-adhesive portions Q1 and Q2 function as receiving openings for receiving a first support portion 33 and a second support portion 34 (described later) of the support member 3 when the insulator 5 is installed in the ceiling space S. The first and second non-adhesive portions Q1, Q2 are formed at approximately the center in the front-rear direction on the left and right ends of the covering portion 52a.

[0029] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1, showing the first insulator 5A and the second insulator 5B installed in the attic space S. As shown in this figure, the first insulator 5A and the second insulator 5B are arranged adjacent to each other in the left-right direction, i.e., the left surface 51b of the insulating material 51 of the first insulator 5A and the right surface 51a of the insulating material 51 of the second insulator 5B face each other with almost no gap between them. In this state, the first excess portion 52b1 of the airtight film 52 of the second insulator 5B extends across the first boundary B1, which is the boundary between the two surfaces 51a and 51b, to the first insulator 5A side (right side). The first excess portion 52b1 beyond the first boundary B1 covers from below the left end of the airtight film 52 of the first insulator 5A, i.e., the first overlapped portion 52a1. The first surplus portion 52b1 and the first overlapped portion 52a1 are welded to each other in this overlapping state, whereby the airtight film 52 of the first insulator 5A and the airtight film 52 of the second insulator 5B are joined together, forming a continuous airtight line between the first insulator 5A and the second insulator 5B.

[0030] FIG. 7 is a vertical cross-sectional view taken along line VII-VII in FIG. 1, showing the first insulator 5A and the third insulator 5C installed in the attic space S. As shown in this figure, the first insulator 5A and the third insulator 5C are arranged adjacent to each other in the front-to-rear direction, i.e., the rear surface 51d of the heat insulating material 51 of the first insulator 5A and the front surface 51c of the heat insulating material 51 of the third insulator 5C face each other with almost no gap between them. In this state, the second excess portion 52b2 of the airtight film 52 of the third insulator 5C extends to the first insulator 5A side (forward) across the second boundary B2, which is the boundary between the two surfaces 51c and 51d. The second excess portion 52b2 beyond the second boundary B2 covers from below the rear end of the airtight film 52 of the first insulator 5A, i.e., the second overlapped portion 52a2. The second surplus portion 52b2 and the second overlapped portion 52a2 are welded to each other in this overlapping state, whereby the airtight film 52 of the first insulator 5A and the airtight film 52 of the third insulator 5C are joined together, forming a continuous airtight line between the first insulator 5A and the third insulator 5C.

[0031] 8 is an enlarged cross-sectional view of a portion of FIG. 2, and FIG. 9 is a perspective view showing the support member 3 alone. As shown in this figure, the support member 3 is a member for supporting the insulator 5 below the beam 2, and is attached to the lower flange 21 of the beam 2. Specifically, the support member 3 includes an attachment portion 31 attached to the lower flange 21, an extension portion 32 extending downward from the attachment portion 31, a first support portion 33 extending rightward from the lower end of the extension portion 32, and a second support portion 34 extending leftward from the lower end of the extension portion 32. In the first embodiment, the support member 3 is a sheet metal product made by processing a single metal plate, and integrally includes the above-mentioned elements 31 to 34.

[0032] The mounting portion 31 is formed in a U-shape when viewed in the front-to-rear direction so as to surround the left half of the flange 21. That is, the mounting portion 31 has an upper side portion 31a arranged along the upper surface of the flange 21, a lower side portion 31b arranged along the lower surface of the flange 21, and a connecting portion 31c connecting the left ends of the upper side portion 31a and the lower side portion 31b. The mounting portion 31 is engaged with the flange 21 in a state in which the flange 21 is sandwiched between the upper side portion 31a and the lower side portion 31b.

[0033] A first leaf spring portion SP1 is formed by cutting and raising a portion of the upper side portion 31a downward. The first leaf spring portion SP1 applies a downward biasing force to the upper surface of the flange 21. This allows the mounting portion 31 to be stably held on the flange 21.

[0034] The lower side portion 31b has a second leaf spring portion SP2 formed by cutting and bending a portion of the lower side portion 31b downward. The second leaf spring portion SP2 applies a downward biasing force to the upper surface of the insulator 5. This allows the insulator 5 to be stably held between the lower side portion 31b and the second support portion 34.

[0035] The extension 32 is formed in a flat plate shape extending downward from the right end of the lower side portion 31b. The extension 32 is located in the center of the flange 21 in the left-right direction, in other words, at a position corresponding to the web 22.

[0036] The first support portion 33 is formed to be continuous with the rear half of the lower end of the extending portion 32 and to extend rightward from the extending portion 32. On the first support portion 33, the left end portion of the insulator 5 is placed.

[0037] The second support portion 34 is formed to be continuous with the front half of the lower end of the extending portion 32 and to extend leftward from the extending portion 32. The right end portion of the insulator 5 is placed on the second support portion 34.

[0038] The support member 3 as described above supports the insulator 5 below the beam 2 with its attached portion 31 attached to the flange 21 of the beam 2. That is, as shown in FIG. 2 , a pair of support members 3 attached to beams 2 aligned in the left-right direction support the insulator 5 below the beam 2 by the first support portion 33 of one of the support members 3 receiving the left end of the insulator 5 and the second support portion 34 of the other support member 3 receiving the right end of the insulator 5.

[0039] 1 and 3, the support members 3 are arranged at approximately equal intervals along the beam 2 in accordance with the dimensions of the insulators 5 lined up in the front-rear direction. Each support member 3 is located near the center of the side end of the corresponding insulator 5 in the front-rear direction.

[0040] 10 is a diagram showing the suspension member 4 attached to the beam 2. As shown in the figure, the suspension member 4 includes an attachment portion 41 attached to the lower flange 21 of the beam 2 via a bolt 45 in a state where the attachment portion 41 surrounds the left half of the flange 21, a nut 42 fixed to the right end portion of the attachment portion 41 located below the center of the flange 21, and a bar screw 43 extending downward from the nut 42 and threaded into the nut 42. A base material (ceiling base) of the ceiling body 6 extending horizontally is fixed to the lower end of the bar screw 43.

[0041] As shown in Figures 1 and 3, the hanging members 4 are arranged along the beam 2 in an alternating relationship with the support members 3. The hanging members 4 are arranged in positions sandwiched between adjacent insulators 5. Specifically, the hanging members 4 are arranged in positions corresponding to the intersections of four insulators 5 adjacent in the front-rear and left-right directions, more specifically, in positions corresponding to the intersections where the corners of the heat insulating materials 51 in these four insulators 5 butt together. In this state, the bar screws 43 of the hanging members 4 are sandwiched between the adjacent heat insulating materials 51, except for their lower parts. In other words, the adjacent insulators 5 are supported by the support members 3 in a state in which portions of the bar screws 43 are sandwiched between the heat insulating materials 51.

[0042] The bar screw 43 of the hanging member 4 extends in the vertical direction while penetrating the airtight film 52 of the insulator 5. A hole is formed in the airtight film 52 to allow the bar screw 43 to pass through. As shown in FIG. 11 , an additional airtight film 55 is attached to the airtight film 52 at the point where the bar screw 43 passes through in order to close the hole in the airtight film 52 for the bar screw 43. The additional airtight film 55 is, for example, an adhesive, flexible film, and is attached to the underside of the airtight film 52 with the bar screw 43 passing through the additional airtight film 55. The additional airtight film 55 tightly contacts the circumferential surface of the bar screw 43 that passes through it, thereby airtightly sealing the periphery of the bar screw 43. The additional airtight film 55 corresponds to an example of the "another airtight film" in the present invention.

[0043] [Construction method] Next, a specific example of a heat insulation construction method for installing insulators 5 in the ceiling part (ceiling space S) of a building having the above-mentioned structure will be described. Note that, as a prerequisite for carrying out heat insulation construction, it is assumed that the underfloor material 1 and the beams 2 thereunder have already been constructed.

[0044] For thermal insulation work, first, an insulator 5 having a thermal insulating material 51 and an airtight film 52 is prepared as shown in Figures 4 and 5. The number of insulators 5 to be prepared can be appropriately determined depending on the size of the ceiling of the building, etc.

[0045] 12, the support members 3 and the hanging members 4 are attached to the beams 2. In each beam 2, the support members 3 and the hanging members 4 are arranged at appropriate intervals according to the dimensions of the insulators 5 arranged in the front-rear direction.

[0046] Next, a plurality of insulators 5 are attached below the beam 2 using the support members 3. For example, the insulators 5 are attached in order from one side to the other in the left-right or front-rear direction. FIGS. 13 to 15 show an example of attaching two insulators 5 lined up in the left-right direction, illustrating the procedure for attaching a first insulator 5A and a second insulator 5B in this order. In this case, as shown in FIG. 13, the right-side first insulator 5A is attached first. Specifically, the left and right ends of the first insulator 5A are supported by the support members 3, respectively, so that the first insulator 5A is attached below the beam 2. FIG. 13 shows the state in which the left end of the first insulator 5A is inserted between the first support portion 33 of the support member 3 and the flange 21 so that the left end of the first insulator 5A is supported by the support member 3.

[0047] When the first insulator 5A is attached as described above, the first support portion 33 is inserted between the heat insulating material 51 and the airtight film 52 of the first insulator 5A. That is, as also shown in FIG. 4, the covering portion 52a of the airtight film 52 covering the heat insulating material 51 has a first non-adhesive portion Q1 at its left end portion (first overlapped portion 52a1). The first support portion 33 is inserted between the heat insulating material 51 and the airtight film 52 (covering portion 52a) at the position of this first non-adhesive portion Q1. As a result, the heat insulating material 51 is placed directly above the first support portion 33, and the covering portion 52a is positioned so as to overlap the first support portion 33 from below.

[0048] Next, as shown in FIG. 14, the left-side second insulator 5B is attached. FIG. 14 shows a state in which the right end of the second insulator 5B is inserted between the second support portion 34 of the support member 3 and the flange 21 (attached portion 31) for this attachment. At this time, the second support portion 34 is inserted between the heat insulating material 51 and the airtight film 52 of the second insulator 5B. That is, as also shown in FIG. 4, the covering portion 52a of the airtight film 52 covering the heat insulating material 51 has a second non-adhesive portion Q2 at its right end. The second support portion 34 is inserted between the heat insulating material 51 and the airtight film 52 (covering portion 52a) at the position of this second non-adhesive portion Q2. As a result, the heat insulating material 51 is placed directly above the second support portion 34, and the covering portion 52a is positioned so as to overlap the second support portion 34 from below.

[0049] As described above, the right end portion of the second insulator 5B is formed with the first excess portion 52b1 that protrudes rightward from the heat insulating material 51. As shown in Fig. 15, after the second insulator 5B is attached, the first excess portion 52b1 is arranged to overlap from below the covering portion 52a (first overlapped portion 52a1) that overlaps the first support portion 33 from below.

[0050] After the first insulator 5A and the second insulator 5B are attached as described above, the boundary between the insulators 5A and 5B is heated from below, as shown in FIG. 15 . While various heating methods are possible, in the first embodiment, heat above a predetermined temperature is applied to the boundary using a heat gun HG. This heating raises the temperature of the first excess portion 52b1 of the second insulator 5B to above its melting temperature, causing the first excess portion 52b1 to melt. The melted first excess portion 52b1 is integrated with the covering portion 52a of the first insulator 5A. In other words, the first excess portion 52b1 of the second insulator 5B and the covering portion 52a of the first insulator 5A are welded to each other.

[0051] The above has described the installation of the first insulator 5A and the second insulator 5B, but similar work is also performed for other combinations of insulators 5 adjacent in the left-right direction.

[0052] On the other hand, in a combination of insulators 5 adjacent in the front-rear direction, the second excess portion 52b2 of one insulator 5 is overlapped from below on the covered portion 52a of the other insulator 5. For example, as shown in FIG. 7, the second excess portion 52b2 of the airtight film 52 extending forward from the front end portion of the heat insulating material 51 of the third insulator 5C is overlapped from below on the rear end portion (second overlapped portion 52a2) of the covered portion 52a of the airtight film 52 of the first insulator 5A. This overlapping portion is also heated in the same manner as in FIG. 15. As a result, the second excess portion 52b2 and the covered portion 52a are welded to each other.

[0053] The above-described process is repeated until the required number of insulators 5 are laid out in the attic space S. This allows the insulators 5 to be arranged without gaps in the front-to-back and left-to-right directions, thereby improving the airtightness and thermal insulation of the attic space S. Note that the first surplus portion 52b1 and the second surplus portion 52b2 may be heated for all of the insulators 5 at once after installation of all of the insulators 5 has been completed.

[0054] After the required number of insulators 5 have been attached as described above, or as appropriate during the attachment process, an additional airtight film 55 is attached to the installation location of the hanging member 4. For example, as shown in FIG. 16 , the additional airtight film 55 is attached to the hanging member 4 between the first insulator 5A and the second insulator 5B so that the pin screw 43 passes through the additional airtight film 55. The additional airtight film 55 is attached to the lower surface of the airtight film 52 of the first insulator 5A and the lower surface of the airtight film 52 of the second insulator 5B. At this time, the additional airtight film 55 is in close contact with the circumferential surface of the pin screw 43, sealing the periphery of the pin screw 43.

[0055] In the above-described insulation construction method, the operations shown in Figure 12 correspond to the "preparation process," "support member installation process," and "hanging member installation process" in the present invention, the operations shown in Figure 13 correspond to the "first support process" in the present invention, the operations shown in Figure 14 correspond to the "second support process" in the present invention, the operations shown in Figure 15 correspond to the "welding process" in the present invention, and the operations shown in Figure 16 correspond to the "attaching process" in the present invention.

[0056] [Action and effect] As described above, in the first embodiment, when installing the first insulator 5A and the second insulator 5B adjacent in the left-right direction in the attic space S, the first insulator 5A is supported by the support member 3 attached to the beam 2, and then the second insulator 5B is supported by the support member 3 in a state in which the airtight film 52 partially overlaps. More specifically, the second insulator 5B is supported by the support member 3 in a state in which the first excess portion 52b1 of the airtight film 52 of the second insulator 5B overlaps from below with the covering portion 52a of the airtight film 52 of the first insulator 5A. Then, by applying heat of a predetermined temperature or higher to the first excess portion 52b1 of the second insulator 5B, the first excess portion 52b1 is melted and welded to the covering portion 52a of the first insulator 5A. The same process is also performed on the first insulator 5A and the third insulator 5C that are adjacent to each other in the front-to-rear direction, and the second excess portion 52b2 of the first insulator 5A is welded to the covering portion 52a of the third insulator 5C. This method has the advantage of improving the efficiency of the process of improving the airtightness and heat insulation of the ceiling of the building.

[0057] That is, in the first embodiment, when the second insulator 5B is attached to a position adjacent to the first insulator 5A in the left-right direction, the first excess portion 52b1 of the second insulator 5B is overlapped from below on the covered portion 52a of the first insulator 5A, so that the first excess portion 52b1 can be welded to the covered portion 52a of the first insulator 5A simply by heating the first excess portion 52b1 of the second insulator 5B. Similarly, when the third insulator 5C is attached to a position adjacent to the first insulator 5A in the front-rear direction, the second excess portion 52b2 of the third insulator 5C is overlapped from below on the covered portion 52a of the first insulator 5A, so that the second excess portion 52b2 can be welded to the covered portion 52a of the first insulator 5A simply by heating the second excess portion 52b2 of the third insulator 5C. This makes it easy to form a continuous airtight line between two insulators 5 adjacent to each other in the left-right or front-back direction, thereby making it possible to efficiently improve the airtightness and insulation of the ceiling portion (attic space S).

[0058] In the first embodiment, the insulating material 51 and the covering portion 52a can be separated from each other at the first non-adhesive portion Q1 and the second non-adhesive portion Q2 formed on both left and right ends of the covering portion 52a. For example, when the first insulator 5A is supported by the support member 3, the first supporting portion 33 of the support member 3 is inserted between the covering portion 52a and the insulating material 51 at the position of the first non-adhesive portion Q1. When the second insulator 5B is supported by the support member 3, the second supporting portion 34 of the support member 3 is inserted between the covering portion 52a and the insulating material 51 at the position of the second non-adhesive portion Q2. This method allows the first supporting portion 33 and the second supporting portion 34 to be covered and hidden by the covering portion 52a, preventing the supporting portions 33, 34 from being exposed below the first insulator 5A.

[0059] Furthermore, in the first embodiment, the first surplus portion 52b1 of the second insulator 5B is overlapped from below with the covering portion 52a of the first insulator 5A overlapping from below with the first support portion 33. According to this method, the first surplus portion 52b1 can be welded to the covering portion 52a in a state where the first support portion 33 and the covering portion 52a covering it are further covered by the first surplus portion 52b1, so that an airtight line can be reliably formed at the location where the first support portion 33 is provided.

[0060] Furthermore, in the first embodiment, the first insulator 5A and the second insulator 5B are arranged adjacent to each other with the hanging member 4 for suspending the ceiling body 6 sandwiched therebetween, and after the above-mentioned welding work, an additional work of attaching an additional airtight film 55 to the underside of the first insulator 5A and the underside of the second insulator 5B with the hanging member 4 inserted therethrough is further performed. This method makes it possible to suspend the ceiling body 6 using the hanging member 4 while ensuring good airtightness. That is, although it is difficult to overlap the airtight films 52 of the first insulator 5A and the second insulator 5B at the installation location of the hanging member 4, according to the first embodiment in which the additional airtight film 55 with the hanging member 4 inserted therethrough is attached to the undersides of both insulators 5A and 5B, it is possible to ensure good airtightness around the hanging member 4.

[0061] (2) Second embodiment Fig. 17 is a view equivalent to Fig. 2 for explaining a second embodiment of the present invention. In the above-mentioned first embodiment, an example in which a single layer of insulator 5 is attached to the ceiling space S has been described, but it is also possible to attach multiple layers of insulator 5. One such example will be described as the second embodiment. Below, differences from the first embodiment will be mainly described, and other descriptions will be omitted or simplified. Furthermore, the same reference numerals will be used for the same components as in the first embodiment.

[0062] 17, the building in the second embodiment includes a plurality of insulators 500 stacked in two upper and lower stages in an attic space S. That is, the plurality of insulators 500 includes a plurality of upper insulators 501 arranged horizontally (front-rear or left-right), and a plurality of lower insulators 502 arranged horizontally below the upper insulators 501. The thicknesses (vertical dimensions) of the upper insulators 501 and the lower insulators 502 can be set as appropriate and may be the same or different, but in the second embodiment, the thicknesses of the insulators 501, 502 are set so that the thickness of the lower insulator 502 is greater than the thickness of the upper insulator 501.

[0063] Support members 300 for supporting upper insulators 501 and lower insulators 502 in a stacked state are attached to the lower flanges 21 of the beams 2, respectively. The support members 300 include an attached portion 301 attached to the lower flanges 21, an extending portion 302 extending downward from the attached portion 301, a first support portion 303 and a second support portion 304 extending in the left-right direction from a middle of the extending portion 302, and a third support portion 305 and a fourth support portion 306 extending in the left-right direction from a lower end of the extending portion 302. The first support portion 303 and the second support portion 304 extend in opposite directions across the extending portion 302, and support opposing ends of adjacent upper insulators 501 in the left-right direction. The third support portion 305 and the fourth support portion 306 extend in opposite directions across the extending portion 302, and support opposing ends of the lower insulators 502 that are adjacent to each other in the left-right direction.

[0064] 18, the upper insulator 501 includes a rectangular parallelepiped heat insulating material 510 and an airtight film 520 fixed by adhesive to the lower surface of the heat insulating material 510. The airtight film 520 has a covering portion 520a that entirely covers the lower surface of the heat insulating material 510 and an excess portion 520b that protrudes outward from the covering portion 520a. The excess portion 520b has a first excess portion 520b1 that extends rightward (outward) beyond the right surface 510a of the heat insulating material 510 and a second excess portion 520b2 that extends forward (outward) beyond the front surface 510c of the heat insulating material 510.

[0065] As in the first embodiment, the first surplus portion 520b1 is overlapped from below onto the left end portion of the covering portion 520a of another adjacent upper insulator 501 to the right and welded thereto. The second surplus portion 520b2 is overlapped from below onto the rear end portion of the covering portion 520a of another adjacent upper insulator 501 to the front and welded thereto. That is, in the second embodiment, in order to airtightly seal the space between adjacent upper insulators 501, the surplus portion 520b is formed in the airtight film 520 of each upper insulator 501.

[0066] In the second embodiment, in which the airtightness is achieved on the underside of the upper insulator 501, when the upper insulator 501 is supported by the support member 300, the first surplus portion 520b1 interferes with the extending portion 302 of the support member 300. To address this interference, in the second embodiment, two notches extending in the left-right direction are made in the first surplus portion 520b1, thereby forming a downward folded portion F1 in the first surplus portion 520b1. The folded portion F1 has a width corresponding to the extending portion 302.

[0067] Specifically, when the upper insulator 501 is supported by the support member 300, the folded portion F1 is folded downward so as to be aligned with the extending portion 302 of the support member 300. At this time, the second support portion 304 of the support member 300 is inserted into the non-bonded portion Q3 of the covered portion 520a. Meanwhile, the first surplus portion 520b1 other than the folded portion F1 is overlapped from below and welded to the covered portion 520a of the upper insulator 501 adjacent to the right. When the first surplus portion 520b1 is heated for this welding, the folded portion F1 is also heated and welded to the extending portion 302.

[0068] According to the second embodiment described above, higher insulation performance can be ensured by the two layers of insulators 500 (upper and lower insulators 501, 502) placed in the attic space S, while a continuous airtight line can be formed between adjacent upper insulators 501.

[0069] In the second embodiment, an airtight line is formed on the underside of the upper insulator 501 by forming an excess portion 520b in the airtight film 520 of the upper insulator 501, but instead of or in addition to this, a similar airtight line may be formed on the underside of the lower insulator 502. That is, when multiple layers of insulators stacked one above the other are arranged in an attic space, it is sufficient that an airtight line is formed on the underside of at least one of the insulator layers, and which layer of insulator has an airtight line formed on the underside can be appropriately determined depending on the construction environment, etc. [Explanation of symbols]

[0070] 3 Support member 4 Hanging members 6 Ceiling body (ceiling surface material) 5A First insulator (first heat insulating and airtight member) 5B Second insulator (second heat insulating airtight member) 33 1st support part 51 Insulation 52 Airtight Film 52a Covering part 52b1 First surplus part (surplus part) 55 Additional airtight film (another airtight film)

Claims

1. A ceiling insulation construction method for insulating the ceiling of a building, a preparation step of preparing a first heat insulating airtight member and a second heat insulating airtight member, each including a heat insulating material having a lower surface that is placed facing the room, and an airtight film that has a covering portion that covers the entire lower surface and an excess portion that extends outward from the lower surface and is attached to the heat insulating material; a support member installation step of installing support members for supporting the first heat insulation and airtight member and the second heat insulation and airtight member at predetermined installation locations; a first supporting step of supporting the first heat insulating and airtight member on the supporting member; a second supporting step of supporting the second heat insulating and airtight member on the supporting member in a state in which an excess portion of the second heat insulating and airtight member overlaps a covering portion of the first heat insulating and airtight member from below; a welding step of applying heat of a predetermined temperature or higher to the excess portion of the second insulating airtight member to melt the excess portion and weld it to the covering portion of the first insulating airtight member.

2. the support member has a first support portion that supports the heat insulating material of the first heat insulating and airtight member from below, In the preparation step, the first heat insulating and airtight member is prepared, in which the airtight film is attached to the heat insulating material in a state in which the heat insulating material and the covering portion can be separated in order to insert the first support portion; 2. The ceiling insulation construction method according to claim 1, wherein in the first support step, the first insulation airtight member is supported by the support member with the first support portion inserted between the insulation material and the covering portion.

3. 3. The ceiling insulation construction method of claim 2, wherein in the second support step, the second insulation airtight member is supported by the support member in a state in which the excess portion of the second insulation airtight member overlaps from below with the first support portion and the covering portion overlapping from below with the first support portion.

4. The method further includes a hanging member installation step of installing a hanging member for suspending a ceiling surface material under the first heat insulation airtight member and the second heat insulation airtight member prior to the second supporting step, In the second supporting step, the second heat insulating and airtight member is supported by the support member in a state in which a part of the hanging member is sandwiched between the heat insulating material of the first heat insulating and airtight member and the heat insulating material of the second heat insulating and airtight member, The ceiling insulation construction method according to any one of claims 1 to 3, further comprising a pasting step of pasting another airtight film over the underside of the first heat-insulating airtight member and the underside of the second heat-insulating airtight member while the hanging member is inserted after the welding step.

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