JP5336288B2 - Insulation for roof and insulation method for roof - Google Patents

Insulation for roof and insulation method for roof Download PDF

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JP5336288B2
JP5336288B2 JP2009176126A JP2009176126A JP5336288B2 JP 5336288 B2 JP5336288 B2 JP 5336288B2 JP 2009176126 A JP2009176126 A JP 2009176126A JP 2009176126 A JP2009176126 A JP 2009176126A JP 5336288 B2 JP5336288 B2 JP 5336288B2
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synthetic resin
resin foam
roof
rafters
heat insulating
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JP2011026912A (en
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敦嗣 白神
陸夫 石田
正典 中村
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ダウ化工株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To increase a working efficiency for heat-insulating a roof. <P>SOLUTION: This heat insulating member for a roof is formed by providing a surface sheet 2 the three edge parts of which form outwardly extended extension parts 4a, 4b, 4c to one surface side of a synthetic resin foam plate 1. In this heat insulating method for a roof, the synthetic resin foam plate 1 is inserted between rafters 3, 3 from the indoor side, and the extension parts 4a, 4b, 4c are attached to the rafters or purlins. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、建物の屋根の断熱に用いる屋根用断熱材及び屋根の断熱施工方法に関するもので、特に屋根の断熱改修に適した屋根用断熱材及び屋根の断熱施工方法に関する。   The present invention relates to a roof heat insulating material and a roof heat insulating construction method used for heat insulation of a building roof, and more particularly to a roof heat insulating material and a roof heat insulating construction method suitable for heat insulating repair of a roof.

従来、屋根用断熱材としては合成樹脂発泡板が広く使用されており、断熱施工方法としては、断熱材を屋根の垂木間に室内側から押し込んだ状態で、垂木に受具を取り付けて断熱材を固定する方法と、垂木に受具を取り付けてから、受具間に断熱材を押し込んで固定する方法とが提案されている(例えば、特許文献1参照)。   Conventionally, a synthetic resin foam board has been widely used as a heat insulating material for roofs, and as a heat insulation construction method, a heat sink is pushed into the rafters from the room side, and a support is attached to the rafters. And a method in which a heat insulating material is pushed between the support members and fixed after attaching the support member to the rafter (for example, see Patent Document 1).

特開平4−70441号公報JP-A-4-70441

しかしながら、上記従来の方法では、断熱材とは別に受具を用意し、1枚の断熱材毎にそれぞれ複数個の受具を垂木に取り付けなければならず、作業性が悪い問題がある。特に、断熱材を垂木間に押し込んだ状態で垂木に受具を取り付ける方法では、受具の取り付けを断熱材を垂木間に押さえ付けながら行わなければならず、受具の取り付け自体が行いにくい問題がある。特に屋根の断熱改修は室内側から行われ、狭い屋根裏での作業となるので、重労働であり、特に夏場は高温下での作業となるので、短時間で作業を完了できるようにすることが望まれている。   However, in the conventional method described above, there is a problem that workability is poor because a holder is prepared separately from the heat insulating material, and a plurality of receiving devices must be attached to the rafter for each heat insulating material. In particular, in the method of attaching the holder to the rafters with the heat insulating material pushed between the rafters, it is necessary to attach the receiver while pressing the heat insulating material between the rafters, and it is difficult to attach the receiver itself. There is. In particular, the insulation of the roof is renovated from the indoor side, and it is a work in a narrow attic. This is a heavy labor, especially in the summer, and the work is performed at high temperatures. It is rare.

本発明は、上記従来の問題点に鑑みてなされたもので、屋根の断熱施工の作業性を向上させることを目的とする。特に屋根の断熱改修の作業性を向上させることを目的とする。   This invention is made | formed in view of the said conventional problem, and it aims at improving the workability | operativity of the heat insulation construction of a roof. In particular, it aims to improve the workability of the insulation of the roof.

本発明の第は、建物の屋根の垂木間の間隔に対応する幅を有する合成樹脂発泡板が、前記垂木の幅よりも小さな間隔を開けて幅方向に複数並列されており、この並列された複数の合成樹脂発泡板の片面側に、各合成樹脂発泡板間に跨がる表面シートが付設されており、該表面シートの少なくとも二方の縁部が並列された複数の合成樹脂発泡板の集合体より外方へ延出した延出部となっていると共に、前記表面シートが伸縮性を有しており、前記合成樹脂発泡板間に開けられた間隔が、前記表面シートを引き延ばすことで、前記垂木の幅に対応する間隔まで拡大可能となっていることを特徴とする屋根用断熱材を提供するものである。 In the first aspect of the present invention, a plurality of synthetic resin foam plates having a width corresponding to the interval between the rafters of the roof of the building are arranged in parallel in the width direction with an interval smaller than the width of the rafter. A plurality of synthetic resin foam plates in which a surface sheet straddling between the respective synthetic resin foam plates is attached to one side of the plurality of synthetic resin foam plates, and at least two edges of the surface sheets are juxtaposed The surface sheet has elasticity, and the space opened between the synthetic resin foam plates extends the surface sheet. Thus, it is possible to provide a heat insulating material for a roof which can be expanded to an interval corresponding to the width of the rafter .

上記本発明の第は、前記各合成樹脂発泡板の前記表面シートの付設面とは反対側の面に熱線反射材が付設されており、しかも前記合成樹脂発泡板と熱線反射材の合計厚さが前記垂木の高さより薄くなっていること、
前記表面シートが合成樹脂フィルムであり、しかも前記合成樹脂発泡板への付設が接着剤による部分的な接着で行われていること、
をその好ましい態様として含むものである。
In the first aspect of the present invention, a heat ray reflective material is attached to the surface of each synthetic resin foam plate opposite to the surface attached to the top sheet, and the total thickness of the synthetic resin foam plate and the heat ray reflective material. The thickness is thinner than the height of the rafters,
The surface sheet is a synthetic resin film, and the attachment to the synthetic resin foam plate is performed by partial adhesion with an adhesive;
Is included as a preferred embodiment thereof.

更に本発明の第は、上記本発明の第に係る屋根用断熱材を用い、相隣接する前記合成樹脂発泡板を、前記表面シートの付設面を室内側にし、前記表面シートを弾性的に引き伸ばして、室内側から前記垂木間にそれぞれ挿入し、前記表面シートの収縮力による垂木の挟み付けにより仮止めした後、前記延出部を垂木又は母屋材へ取り付けることを特徴とする屋根の断熱施工方法を提供するものである。 Furthermore, a second aspect of the present invention uses the roof heat insulating material according to the first aspect of the present invention, wherein the adjacent synthetic resin foam plates are provided with the surface of the surface sheet attached to the indoor side, and the surface sheet is elastic. The roof is characterized in that it is inserted between the rafters from the indoor side and temporarily fixed by sandwiching the rafters by the contraction force of the topsheet, and then the extension part is attached to the rafters or the purlin material. A heat insulation construction method is provided.

発明の第及び第によれば、表面シートの伸縮性を利用して仮止めすることができるので、施工性が一層向上する。また、軒先付近になると屋根裏空間が狭くタッカーなどによる固定作業がしにくくなるが、上記仮止め力があるので、固定作業を省略することが可能となる。また、相隣接して設けられる屋根用断熱材における延出部同士を重ね合わせることで、気密性を向上させることができる。 According to the 1st and 2nd of this invention, since it can fix temporarily using the elasticity of a surface sheet, workability | operativity improves further. Moreover, although the attic space is narrow near the eaves, it is difficult to perform fixing work using a tucker or the like. However, since the temporary fixing force is provided, the fixing work can be omitted. Moreover, airtightness can be improved by overlapping the extension parts in the heat insulating material for roofs provided adjacent to each other.

更に、表面シートの付設面とは反対側の面に熱線反射材が付設されており、しかも合成樹脂発泡板と熱線反射材の合計厚さが垂木の高さより薄くなっていると、熱線反射材と野地板の間に確実に空間(空気層)を確保することができ、熱線反射材による断熱効果の向上作用を高めることができる。また、表面シートが合成樹脂フィルムであり、しかも合成樹脂発泡板への付設が接着剤による部分的な接着で行われていると、延出部にシワが寄ったりカールを生じにくく、延出部の張り出し状態を垂木や母屋材などへの固定作業が行いやすい状態に維持しやすくなる。   Furthermore, when the heat ray reflective material is attached to the surface opposite to the surface attached to the top sheet, and the total thickness of the synthetic resin foam plate and the heat ray reflective material is thinner than the height of the rafter, the heat ray reflective material A space (air layer) can be reliably ensured between the base plate and the base plate, and the heat insulation effect improving action by the heat ray reflective material can be enhanced. Further, if the top sheet is a synthetic resin film and the attachment to the synthetic resin foam plate is performed by partial adhesion with an adhesive, the extension portion is less likely to wrinkle or curl, and the extension portion It is easy to maintain the overhanging state in a state where it can be easily fixed to a rafter or a purlin.

根用断熱材の参考例を示す斜視図である。It is a perspective view showing a reference example of roofing insulation for. 図1に示される屋根用断熱材を用いた屋根の断熱施工方法の説明図である。It is explanatory drawing of the heat insulation construction method of the roof using the heat insulating material for roofs shown by FIG. 根用断熱材の他の参考例を示す斜視図である。It is a perspective view showing another reference example of the roof for insulation. 図3に示される屋根用断熱材の取り付け状態を示す図である。It is a figure which shows the attachment state of the heat insulating material for roofs shown by FIG. 本発明に係る屋根用断熱材の一例を示す平面図である。It is a top view which shows an example of the heat insulating material for roofs concerning this invention. 図5に示される屋根用断熱材を用いた屋根の断熱施工方法の説明図である。It is explanatory drawing of the heat insulation construction method of the roof using the heat insulating material for roofs shown by FIG.

まず、図1及び図2に基づいて屋根の断熱施工方法の参考例を説明する。 First, the reference example of the heat-insulating construction method roof with reference to FIGS.

図1に示されるように、使用する屋根用断熱材は、合成樹脂発泡板1の片面側に表面シート2を付設したものとなっている。合成樹脂発泡板1と表面シート2は、いずれも平面長方形状をなしており、合成樹脂発泡板1の幅(短辺方向の長さ)は図2に示される屋根の垂木3,3間の間隔(垂木3,3間の空間幅)に対応する長さとなっている。また、表面シート2の三方の縁部は合成樹脂発泡板1よりも外方に延出しており、三方に延出部4a,4b,4cを形成している。延出部4a,4b,4cは、取付片として用いられるもので、取り付け時に垂木3に対応する両長辺側と、一方の短辺側とに設けられていることが好ましい。なお、垂木3,3間の間隔に対応する合成樹脂発泡板1の幅とは、垂木3,3間に挿入することができる幅で、しかも1cm以上の隙間を生じないことをいう。本例では、表面シート2の三方の縁部が合成樹脂発泡体1よりも外方に延出しているが、少なくとも二方の縁部が延出していれば良く、好ましくは三方以上である。 As shown in FIG. 1, the roof heat insulating material used has a surface sheet 2 attached to one side of a synthetic resin foam board 1. Both the synthetic resin foam board 1 and the top sheet 2 have a flat rectangular shape, and the width of the synthetic resin foam board 1 (length in the short side direction) is between the rafters 3 of the roof shown in FIG. The length corresponds to the interval (space width between the rafters 3 and 3). Moreover, the three edge parts of the surface sheet 2 are extended outward from the synthetic resin foam board 1, and the extension parts 4a, 4b, and 4c are formed in the three directions. The extension portions 4a, 4b, and 4c are used as attachment pieces, and are preferably provided on both long sides corresponding to the rafters 3 and one short side when attached. Note that the width of the synthetic resin foam plate 1 corresponding to the spacing between the vertical wood 3,3, a width that can be inserted between rafters 3,3, moreover means that no more than a gap 1 cm. In the present example, the edges of the three sides of the topsheet 2 extends outward beyond the synthetic resin foam 1, it is sufficient to extend the edge of the two-way even without low, preferably a three-way or more is there.

合成樹脂発泡板1としては、例えばポリスチレン系発泡板、ポリエチレン系発泡板、ポリプロピレン系発泡板、ポリウレタン系発泡板、フェーノール樹脂系発泡板などを用いることができるが、吸水性が低く、断熱性に優れることから、ポリスチレンの発泡板が好ましい。表面シート2としては、例えば、厚みが20〜200μm程度のポリエチレンフィルム、ポリエステルフィルムを好ましく用いることができる。また、不織布シートなどを用いることもできるが、気密性を得やすくするために、合成樹脂のコーティングが施されたものが好ましい。   As the synthetic resin foam board 1, for example, a polystyrene foam board, a polyethylene foam board, a polypropylene foam board, a polyurethane foam board, a phenol resin foam board, and the like can be used. Since it is excellent, a polystyrene foam plate is preferable. As the surface sheet 2, for example, a polyethylene film or a polyester film having a thickness of about 20 to 200 μm can be preferably used. Moreover, although a nonwoven fabric sheet etc. can also be used, in order to make airtightness easy, what was coated with the synthetic resin is preferable.

表面シート2として気密性が得やすい合成樹脂フィルムを用いる場合、合成樹脂発泡板1への付設は、熱ラミネーションによってもよいが、延出部4a,4b,4cを平坦でカールのない状態に保ちやすくするために、接着剤による部分接着(例えば多数の点又はライン状接着)によることが好ましい。また、同様の理由から、用いる合成樹脂フィルムは無延伸フィルムであることが好ましい。   When a synthetic resin film that is easy to obtain airtightness is used as the top sheet 2, the attachment to the synthetic resin foam plate 1 may be performed by thermal lamination, but the extended portions 4a, 4b, and 4c are kept flat and free of curls. In order to facilitate, it is preferable to use partial bonding with an adhesive (for example, multiple dots or line-shaped bonding). For the same reason, the synthetic resin film to be used is preferably an unstretched film.

上記合成樹脂発泡板1及び表面シート2を備えた屋根用断熱材の取り付けは、図2(a)に示されるように、合成樹脂発泡板1を、表面シート2の付設面を室内側にして、室内側から垂木3,3間に挿入し、延出部4a,4cを垂木3,3にタッカーや釘打ちなどで取り付けることで行われる。また、図2(b)に示されるように、垂木3を挟んで短辺方向に相隣接する屋根用断熱材間において、隣接する延出部4aと延出部4cを重ね合わせるようにすると、屋根の気密性を向上させることができる。また、短辺側に延出している延出部4bは、対応する位置に母屋材(図示されていない)が存在する場合には母屋材へ取り付けることができる。また、延出部4bは、長辺方向に相隣接する他の屋根用断熱材の表面シート2に重ね合わせることで、屋根の気密性を向上させることができる。なお、図2において5は野地板である。   As shown in FIG. 2 (a), the roof insulation material provided with the synthetic resin foam plate 1 and the top sheet 2 is mounted with the synthetic resin foam plate 1 on the indoor side. It is carried out by inserting between the rafters 3 and 3 from the indoor side and attaching the extension portions 4a and 4c to the rafters 3 and 3 by tucker or nailing. Further, as shown in FIG. 2B, when the adjacent extending portions 4a and 4c are overlapped with each other between the insulating materials for roofs adjacent to each other in the short side direction with the rafter 3 interposed therebetween, The airtightness of the roof can be improved. Moreover, the extension part 4b extended to the short side can be attached to the purlin material when the purlin material (not shown) exists at the corresponding position. Moreover, the extended part 4b can improve the airtightness of a roof by overlapping on the surface sheet 2 of the other heat insulating material for roofs adjacent to each other in the long side direction. In FIG. 2, 5 is a field board.

参考例に係る屋根の断熱施工方法には、図3に示されるような屋根用断熱材を用いることもできる。この屋根用断熱材は、基本的には図1で説明した屋根用断熱材と同じであるが、合成樹脂発泡板1の表面シート2の付設面とは反対側に熱線反射材6が付設されている点が相違している。熱線反射材6は、例えばアルミニウム箔などの反射層を有するフィルムである。この屋根用断熱材の場合、図4に示されるように、合成樹脂発泡板1と熱線反射材6の合計厚さを垂木3の高さより薄くしておくことが好ましい。合成樹脂発泡板1と熱線反射材6の合計厚さを垂木3の高さより薄くしておくことにより、熱線反射材6と野地板5との間に確実に空間(空気層)を確保することができ、熱線反射材6を設けたことによる断熱効果の向上を効果的に引き出すことができる。通常、垂木3の高さは60mmであるので、合成樹脂発泡板1と熱線反射材6の合計厚さは20〜50mmが好ましい。 A roof heat insulating material as shown in FIG. 3 can also be used in the roof heat insulating construction method according to this reference example . This roof heat insulating material is basically the same as the roof heat insulating material described with reference to FIG. 1, but a heat ray reflective material 6 is provided on the opposite side of the surface of the surface sheet 2 of the synthetic resin foam plate 1. Is different. The heat ray reflective material 6 is a film having a reflective layer such as an aluminum foil. In the case of this heat insulating material for roofs, as shown in FIG. 4, the total thickness of the synthetic resin foam plate 1 and the heat ray reflective material 6 is preferably made thinner than the height of the rafters 3. By ensuring that the total thickness of the synthetic resin foam plate 1 and the heat ray reflective material 6 is thinner than the height of the rafters 3, a space (air layer) is reliably ensured between the heat ray reflective material 6 and the base plate 5. It is possible to effectively improve the heat insulation effect due to the provision of the heat ray reflective material 6. Usually, since the height of the rafter 3 is 60 mm, the total thickness of the synthetic resin foam plate 1 and the heat ray reflective material 6 is preferably 20 to 50 mm.

次に、図5及び図6に基づいて、本発明に係る屋根用断熱材の一例と、それを用いた断熱施工方法を説明する。   Next, based on FIG.5 and FIG.6, an example of the heat insulating material for roofs concerning this invention and the heat insulation construction method using the same are demonstrated.

図5に示されるように、平面長方形をなす複数の合成樹脂発泡板1,1,…が幅方向に間隔を開けて並列されている。各合成樹脂発泡板1,1,…は、図6に示される垂木3,3間の間隔に対応する幅を有するものとなっている。また、並列された合成樹脂発泡板1,1,…間の間隔W0は、図6に示される垂木3,3の幅W1より小さくなっている。   As shown in FIG. 5, a plurality of synthetic resin foam plates 1, 1,... Having a planar rectangle are arranged in parallel with a gap in the width direction. Each of the synthetic resin foamed plates 1, 1,... Has a width corresponding to the interval between the rafters 3, 3 shown in FIG. Further, the interval W0 between the parallel synthetic resin foam plates 1, 1,... Is smaller than the width W1 of the rafters 3, 3 shown in FIG.

上記並列された合成樹脂発泡板1,1,…の片面側には、各合成樹脂発泡板1,1,…間に跨る表面シート2が付設されている。この表面シート2の三方の縁部は、並列された合成樹脂発泡板1,1,…の集合体より外方へ延出した延出部4a,4b,4cとなっている。また、本例における表面シート2は、例えばポリエチレンフィルムなど、伸縮性を有する材料で構成されている。   On one side of the synthetic resin foam plates 1, 1,... That are juxtaposed, a surface sheet 2 that extends between the synthetic resin foam plates 1, 1,. The three edge portions of the surface sheet 2 are extended portions 4a, 4b, 4c extending outward from the assembly of the synthetic resin foam plates 1, 1,. Moreover, the surface sheet 2 in this example is comprised with the material which has a stretching property, such as a polyethylene film, for example.

上記屋根用断熱材の取り付けも、基本的には図2での説明と同様にして行われるが、相隣接する合成樹脂発泡板1,1をそれぞれ垂木3,3間に挿入するに際し、表面シート2を弾性的に引き伸ばし、合成樹脂発泡板1と1の間の間隔が広げられる。合成樹脂発泡板1と1の間の間隔を弾性的に広げて垂木3,3間に挿入することで、表面シート2の収縮力によって合成樹脂発泡板1,1が垂木3を挟み付け、これにより仮止めすることができる。そして、同様にして各合成樹脂発泡板1,1,…を垂木3,3間に挿入することで、屋根用断熱材全体を仮止め状態で設置することができる。したがって、延出部4a,4cの垂木3,3への取り付けや延出部4bの母屋材への取り付けはこの仮止め状態で行うことができ、作業性が向上する。   The installation of the above-mentioned heat insulating material for the roof is basically performed in the same manner as described with reference to FIG. 2, but when inserting the adjacent synthetic resin foamed plates 1, 1 between the rafters 3, 3, a surface sheet 2 is stretched elastically, and the space between the synthetic resin foam plates 1 and 1 is widened. The gap between the synthetic resin foam plates 1 and 1 is elastically expanded and inserted between the rafters 3 and 3, so that the synthetic resin foam plates 1 and 1 sandwich the rafter 3 by the contraction force of the top sheet 2. Can be temporarily fixed. And by inserting each synthetic resin foam board 1,1, ... between the rafters 3,3 similarly, the whole heat insulating material for roofs can be installed in a temporarily fixed state. Therefore, the extension parts 4a and 4c can be attached to the rafters 3 and 3 and the extension part 4b can be attached to the purlin material in this temporarily fixed state, thereby improving workability.

伸縮性を有する表面シート2で並列状態で連結しておく合成樹脂発泡板1,1,…の枚数は、複数枚であれば特に制限はないが、狭い屋根裏への搬入性などの点から、2〜4枚程度とすることが好ましい。また、合成樹脂発泡板1,1,…には、図2で説明した熱線反射材6を付設しておくこともできる。   The number of the synthetic resin foam plates 1, 1,... To be connected in parallel with the surface sheet 2 having stretchability is not particularly limited as long as it is a plurality of sheets, but from the point of carrying into a narrow attic, It is preferable to use about 2 to 4 sheets. Moreover, the heat ray reflective material 6 demonstrated in FIG. 2 can also be attached to the synthetic resin foam board 1,1, ....

1 合成樹脂発泡板
2 表面シート
3 垂木
4a,4b,4c 延出部
5 野地板
6 熱線反射材
DESCRIPTION OF SYMBOLS 1 Synthetic resin foam board 2 Surface sheet 3 Rafters 4a, 4b, 4c Extension part 5 Field plate 6 Heat ray reflective material

Claims (4)

建物の屋根の垂木間の間隔に対応する幅を有する合成樹脂発泡板が、前記垂木の幅よりも小さな間隔を開けて幅方向に複数並列されており、この並列された複数の合成樹脂発泡板の片面側に、各合成樹脂発泡板間に跨がる表面シートが付設されており、該表面シートの少なくとも二方の縁部が並列された複数の合成樹脂発泡板の集合体より外方へ延出した延出部となっていると共に、前記表面シートが伸縮性を有しており、前記合成樹脂発泡板間に開けられた間隔が、前記表面シートを引き延ばすことで、前記垂木の幅に対応する間隔まで拡大可能となっていることを特徴とする屋根用断熱材。 A plurality of synthetic resin foam plates having a width corresponding to the interval between the rafters of the roof of the building are juxtaposed in the width direction with an interval smaller than the width of the rafters. A surface sheet straddling between the respective synthetic resin foam plates is attached to one side of the surface sheet, and outward from an aggregate of a plurality of synthetic resin foam plates in which at least two edges of the surface sheet are juxtaposed The surface sheet has elasticity, and the gap between the synthetic resin foam plates extends the surface sheet to the width of the rafter. Insulation for roofs that can be expanded to the corresponding interval . 前記各合成樹脂発泡板の前記表面シートの付設面とは反対側の面に熱線反射材が付設されており、しかも前記合成樹脂発泡板と熱線反射材の合計厚さが前記垂木の高さより薄くなっていることを特徴とする請求項に記載の屋根用断熱材。 A heat ray reflective material is attached to the surface of the synthetic resin foam plate opposite to the surface attached to the top sheet, and the total thickness of the synthetic resin foam plate and the heat ray reflective material is thinner than the height of the rafters. The roof heat insulating material according to claim 1 , wherein the heat insulating material is a roof. 前記表面シートが合成樹脂フィルムであり、しかも前記合成樹脂発泡板への付設が接着剤による部分的な接着で行われていることを特徴とする請求項又はに記載の屋根用断熱材。 The heat insulating material for roof according to claim 1 or 2 , wherein the top sheet is a synthetic resin film, and the attachment to the synthetic resin foam plate is performed by partial adhesion with an adhesive. 請求項のいずれか1項に記載の屋根用断熱材を用い、相隣接する前記合成樹脂発泡板を、前記表面シートの付設面を室内側にし、前記表面シートを弾性的に引き伸ばして、室内側から前記垂木間にそれぞれ挿入し、前記表面シートの収縮力による垂木の挟み付けにより仮止めした後、前記延出部を垂木又は母屋材へ取り付けることを特徴とする屋根の断熱施工方法。 The heat insulating material for roofs according to any one of claims 1 to 3 , wherein the synthetic resin foam plates adjacent to each other are provided with the attached surface of the top sheet indoors, and the top sheet is elastically stretched. A method for heat insulation of a roof, wherein the roof is inserted between the rafters from the indoor side, temporarily fixed by sandwiching the rafters by the contraction force of the top sheet, and then the extension part is attached to the rafters or the purlin material .
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