JP6068902B2 - Rooftop thermal insulation construction method - Google Patents

Description

  The present invention relates to a method for constructing a roof heat insulating waterproof structure, and particularly to a method for constructing a roof heat insulating waterproof structure suitable for construction in a hot season such as summer.

  Insulation waterproofing structure on the roof of reinforced concrete structure, for example, a waterproof layer is constructed on a roof concrete slab, a heat insulation layer made of a synthetic resin foam is formed on the roof concrete slab, and further pressed down with an insulating sheet on it. It is constructed by placing.

  When constructing the rooftop insulation waterproof structure as described above, an extruded foam plate using polystyrene as a base resin (hereinafter also referred to as a polystyrene extruded foam plate) is used as a heat insulation layer, and construction is performed in hot seasons such as summer. In some cases, during the construction, the heat insulating layer made of extruded foam is deformed and warped by heat, which hinders the subsequent processes, for example, the construction of joint material on the heat insulating layer, the placement of pressing concrete, etc. was there.

  Therefore, in order to solve the above problems, Patent Document 1 proposes a thermoplastic resin foam excellent in heat resistance, chemical resistance, and the like, and a method for producing the same. It has been proposed to be used for construction of a heat insulating waterproof structure.

JP 2008-1885 A

  However, although the thermoplastic resin foam disclosed in Patent Document 1 is certainly excellent in heat resistance, chemical resistance, etc., it has been generally used for construction of rooftop heat insulating waterproof structures and the like. The thermoplastic resin foam is more expensive than a polystyrene extruded foam plate or the like, and has a problem in cost.

  The present invention has been made in view of the circumstances of the background art as described above, and effectively performs warping of a heat insulating layer made of a polystyrene extruded foam board even when construction is performed in a hot season such as summer. An object of the present invention is to provide a construction method that can prevent the construction of a roof heat insulating waterproof structure at a low cost.

  As a result of earnest research to achieve the above-mentioned purpose, the inventors of the present application have found that the insulating sheet laid above one of the causes of warping of the heat insulating layer made of polystyrene extruded foam plate is a strong summer sun. When exposed to light, the heat was absorbed, and it was determined that the heat insulating layer made of a polystyrene extruded foam plate directly below was heated to a high temperature exceeding 80 ° C., thereby completing the present invention.

That is, this invention made it the construction method of the roof heat insulation waterproof structure as described in following [1]-[4].
[1] At least a roof heat insulating waterproof structure in which an extruded foam plate made of polystyrene as a base resin is laid on a roof concrete slab to form a heat insulating layer, and an insulating sheet is interposed above the insulating concrete layer to form a pressing concrete layer. In the construction method, the insulating sheet has a lightness (L *) of 70 or more and a basis weight of 60 to 200 g / m ² , and the extruded foam plate has a density of 0.025 to 0.04 g / A construction method for a roof heat insulating waterproof structure, characterized by using a polystyrene extruded foam plate with a molded skin having a thickness of cm ³ and a thickness of 25 to 80 mm .
[2] The construction method for a roof heat insulating waterproof structure according to [1], wherein the insulating sheet has a basis weight of 114 to 200 g / m ² .
[3] The method for constructing a roof heat insulating waterproof structure according to the above [1] or [2], wherein joint materials are provided in the holding concrete layer at appropriate intervals.
[4] The method for constructing a roof heat insulating waterproof structure according to any one of [1] to [3], wherein a waterproof layer is provided between the roof concrete slab and the heat insulating layer.

  According to the construction method of the roof heat insulating waterproof structure according to the present invention described above, by using an insulating sheet having a lightness (L *) of 70 or more as the insulating sheet, it reflects solar radiation (especially infrared rays) and lowers the heat insulating layer. It is possible to suppress the temperature rise of the heat insulation layer, and even when it is installed in hot weather such as summer, it is possible to effectively prevent the heat insulation layer made of polystyrene extruded foam plate from warping and to construct a roof insulation waterproof structure at a low cost. it can.

It is sectional drawing which showed one embodiment of the roof heat insulation waterproof structure constructed | assembled by the construction method which concerns on this invention. It is sectional drawing which showed one construction example of the joint material. It is the conceptual side view which showed the temperature measurement site | part by the thermocouple performed in the test. It is the conceptual side view which showed the measuring method of the curvature amount of the polystyrene extrusion foam board performed in the test.

  Hereinafter, the example of embodiment of the construction method of the roof heat insulation waterproofing structure concerning the present invention is described.

  FIG. 1 is a cross-sectional view showing an embodiment of a roof heat insulating waterproof structure constructed by a construction method according to the present invention. The illustrated roof insulation waterproof structure 10 includes a waterproof layer 2 formed on the roof concrete slab 1, a heat insulation layer 3 formed on the waterproof layer 2, and an insulation sheet 4 on the heat insulation layer 3. It consists of the pressing concrete layer 5 formed in this way. The presser concrete layer 5 is provided with joint materials 6 at regular intervals.

  The roof concrete slab 1 is made of a roof concrete slab used for a concrete building. Usually, the roof concrete slab 1 is constructed by assembling a formwork at a construction site and placing the concrete on the formwork and then placing concrete. There are also cases where concrete is cast and constructed using a deck plate as a formwork.

  The waterproof layer 2 formed on the roof concrete slab 1 is a layer formed as needed, and generally prevents rainwater penetration on the roof of a building, asphalt waterproof, sheet waterproof, modified asphalt waterproof, It consists of waterproofing of paint film, waterproofing of mortar and the like.

As a concrete construction example of the waterproof layer 2, for example, first, an asphalt primer is applied to the surface of the roof concrete slab 1, and then asphalt is applied at an application amount of 1.0 kg / m ² , Asphalt roofing is laid on top. Further, asphalt is applied again from above at a coating amount of 1.0 kg / m ² , and stretch roofing is laid thereon. Then, asphalt is applied again at a coating amount of 1.0 kg / m ² from above, and then stretch roofing is again laid from above. Further, by applying asphalt again at a coating amount of 2.0 kg / m ² , a waterproof layer 2 having an eight-layer structure can be formed. The waterproof layer 2 thus formed is made of an asphalt layer having a thickness of generally 3 to 10 mm, preferably 4 to 6 mm.

  The heat insulating layer 3 formed on the waterproof layer 2 is formed by laying a polystyrene extruded foam plate on the waterproof layer 2 without a gap. An extruded foam using polystyrene as a base resin is particularly preferably used because it has a high heat insulation performance, a low water absorption, and excellent water resistance.

As a polystyrene extrusion foam board which forms the heat insulation layer 3, it is usually preferable to use a foam having a density of 0.0125 to 0.05 g / cm ³ , preferably 0.025 to 0.04 g / cm ³ . The heat insulating layer 3 formed by laying the polystyrene extruded foam plate generally has a thickness of 20 to 100 mm, preferably 25 to 80 mm.

  The insulating sheet 4 is interposed between the heat insulating layer 3 and the pressing concrete layer 5 formed as an upper layer thereof, and has a function of preventing them from sticking to each other. As this insulating sheet 4, it is preferable to use a moisture permeable sheet that does not allow water to pass through but easily allows water vapor to pass therethrough. Specifically, a resin sheet such as a polystyrene sheet, a nylon sheet, or a urethane sheet, or polypropylene, polyethylene, or the like. A flat yarn cloth or a non-woven fabric obtained by plain weaving can be used.

  As the insulating sheet 4, a sheet having a lightness (L *) of 70 or more, preferably 75 or more, measured according to JIS Z 8729 is used from the viewpoint of suppressing the temperature rise of the lower heat insulating layer 3. This is because, in the case of using such a high-lightness insulating sheet, for example, a beige or white insulating sheet, as reflected by a test example described later, it reflects solar radiation (particularly infrared rays). The temperature rise of the lower heat insulating layer 3 can be effectively suppressed, and the warp of the polystyrene extruded foam plate constituting the lower heat insulating layer 3 laid down can be prevented even when the construction is performed in hot weather such as summer. Can do. Such an insulating sheet 4 is applied by laying on the surface of the previously formed heat insulating layer 3 without a gap.

Basis weight of the insulating sheet 4 is preferably 50 to 200 g / m ^2, and more preferably 60 to 160 / m ^2. If the weight per unit area is too high, the insulating sheet is usually rolled into a roll with a width of about 1000 mm, so that the roll weight becomes heavy and the workability of one person may be deteriorated, and the insulating sheet may be wrinkled. Since it becomes easy, when installing a joint material on an insulating sheet, a joint material may bend and it may become impossible to construct, and also it becomes disadvantageous also in terms of cost. On the other hand, if the basis weight is too low, when the wind blows, the construction position tends to shift and it is difficult to construct, and when a person puts on the insulating sheet, it will break or leave a gap, and when placing the pressing concrete, Noro may enter the heat insulating material and cause a problem in strength.

  The presser concrete layer 5 constituting the roof heat insulating waterproof structure is generally constructed by placing joint material 6 on the insulating sheet 4 at a predetermined interval (for example, about 3 m) at the construction site, and then placing concrete between the joint materials. It is formed by installing. The concrete plate forming the presser concrete layer 5 has a thickness of generally 20 to 100 mm, preferably 40 to 80 mm.

  The joint material 6 is deformed and compressed in accordance with the expansion of the presser concrete layer 5, and expands so that the concrete and the joint material are not separated when the presser concrete layer 5 contracts. It has a function to prevent various obstacles. As the joint material 6, a resin foam, a rubber foam or the like is generally used. Among these, by using a resin foam having moisture permeability, the accumulated water on the lower constituent layer can permeate to the outside as water vapor and promote moisture exhaust. As shown in FIG. 2, the joint material 6 is generally temporarily fixed on the insulating sheet 4 with an adhesive tape or the like to dispose the fixed base 7 at a predetermined interval (for example, about 3 m). It is installed by inserting joint material 6 into 7.

  The construction method for rooftop heat insulation waterproofing according to the present invention is as described above. In particular, the insulating sheet 4 is characterized in that the lightness (L *) is 70 or more. And by this, when the insulating sheet 4 with high brightness reflects sunlight rays (especially infrared rays), the temperature rise of the lower heat insulating layer 3 can be effectively suppressed, and the construction is performed in a hot season such as summer. In addition, it is possible to prevent the heat insulating layer 3 made of the formed polystyrene extruded foam plate from warping and to construct the roof heat insulating waterproof structure 10 at a low cost.

  That is, conventionally, as the insulating sheet, generally brown (lightness: about 50) or gray (lightness: about 60) has been used. Then, this insulating sheet is spread on the surface of the heat insulating layer 3 formed earlier without gaps, and a joint material is applied as necessary, and in the concrete placing process for forming the pressing concrete layer 5 as a post process. I was prepared. There is no problem if the concrete is placed immediately after the insulation sheet is laid, but it is not done immediately because the contractor is different, and the insulation sheet is spread on the surface of the heat insulating layer 3 for several hours. Most of them were left for several days. When the period of this neglect is a hot season such as summer, the insulating sheet exposed on the surface is exposed to strong sunlight in the summer to absorb the heat, and the heat insulating layer 3 made of a polystyrene extruded foam plate directly below. Has been heated to a high temperature exceeding 80 ° C. to cause warping of the polystyrene extruded foam plate. The present invention effectively prevents warping of the polystyrene extruded foam plate by using a high-lightness insulating sheet.

Test example

  Hereinafter, although the test example which discovered the construction method of the said roof heat insulation waterproofing which concerns on this invention is described, this invention is not limited at all by these test examples.

(1) Test method On a concrete slab (thickness: 20 cm) existing in a place exposed to direct sunlight, a polystyrene extruded foam plate (size: 910 mm width, 450 mm length, 25 mm thickness, apparent density: 35 kg / m ³ , 6 sheets with molding skin) were placed side by side, and different insulating sheets were placed thereon, the temperature change of each part was measured with a thermocouple for about 6 hours, and then the amount of warpage of each polystyrene extruded foam plate was measured.

The following six sheets were used as the insulating sheet.
Insulation sheet A (color: black, brightness: 18, basis weight: 87 g / m ² , material: polyethylene)
Insulation sheet B (color: brown, lightness: 50, basis weight: 99 g / m ² , material: polyethylene)
Insulation sheet C (color: dark blue, lightness: 40, basis weight: 141 g / m ² , material: polyethylene)
Insulation sheet D (color: gray, lightness: 61, basis weight: 118 g / m ² , material: polyethylene)
Insulation sheet E (color: beige, lightness: 77, basis weight: 114 g / m ² , material: polyethylene)
Insulating sheet F (color: white, brightness: 78, basis weight: 144 g / m ² , material: polyethylene)
In addition, the lightness is measured according to JIS Z 8729 according to L ^* a ^* b ^* color system L ^* (Nippon Denshoku Industries Co., Ltd., Spectro Color Meter SE 2000 Software Color Management Software ColorMate 5 Version 5.04). Used. The basis weight is determined by measuring the weight of a test piece obtained by cutting an insulating sheet with A4 size scissors, dividing the weight by the area of the test piece, and further converting the unit to [g / m ² ]. It was.

  Temperature measurement using a thermocouple was performed at three points shown in FIG. That is, the measurement was performed on the insulating sheet at point a, between the insulating sheet at point b and the polystyrene extruded foam plate, and between the polystyrene extruded foam plate at point c and the concrete slab. In addition, the thermocouple uses a GK0 K coated thermocouple manufactured by Chino Co., Ltd. for measurement on the insulating sheet, and measures between the insulating sheet and the polystyrene extruded foam plate and between the polystyrene extruded foam plate and the concrete slab. The THERMO COUPLE K thermocouple sheath type 9FE made by Toho Denshi Co., Ltd. was used. Then, these thermocouples were connected to midi LOGGER GL820 manufactured by Graphtec Corporation, and the temperature was measured.

  The amount of warpage of the polystyrene extruded foam plate was measured by inverting the polystyrene extruded foam plate as shown in FIG. 4 and measuring the gap at the center in the 910 mm width direction with a scale.

  The maximum temperature on the test day was 29.5 ° C. at 14:00. The temperature measurement of each part with a thermocouple was performed for about 6 hours from 9:00 to 15:00 on that day.

(2) Test results Table 1 shows the measured amount of warpage of the extruded polystyrene foam plate together with the brightness and the highest temperature reached of the extruded polystyrene foam plate for each insulating sheet used.

(3) Summary According to the test described above, the temperature rise of the polystyrene extruded foam plate is greatly different depending on the color difference of the insulating sheet laid above the polystyrene extruded foam plate. It was found that there was a large correlation with lightness, which is an indicator of color intensity.
Further, if an insulating sheet having a lightness of 70 or more is used, the maximum temperature reached of the polystyrene extruded foam plate can be kept low, and the amount of warpage of the polystyrene extruded foam plate is 10 mm or less that does not hinder subsequent enforcement. I found out that I could do it.

DESCRIPTION OF SYMBOLS 1 Roof concrete slab 2 Waterproof layer 3 Heat insulation layer 4 Insulation sheet 5 Pressing concrete layer 6 Joint material 7 Fixed base 10 Roof heat insulation waterproof structure

Claims (4)

At least in the construction method of the roof insulation waterproof structure in which an extruded foam plate made of polystyrene as a base resin is laid on the roof concrete slab to form a heat insulation layer, and a pressing concrete layer is formed by interposing an insulating sheet above it. As the insulating sheet, one having a lightness (L *) of 70 or more and a basis weight of 60 to 200 g / m ² , and as the extruded foam plate, a density of 0.025 to 0.04 g / cm ³ , A construction method for a roof heat insulating waterproof structure, wherein a polystyrene extruded foam plate with a molding skin having a thickness of 25 to 80 mm is used . It said as the insulating sheet, wherein the basis weight used as a 114 to 200 g / m ^2, the construction method of roof insulation waterproofing structure according to claim 1.   The construction method of the roof heat insulation waterproof structure according to claim 1 or 2, wherein joint material is provided in said press concrete layer at a suitable interval.   The construction method of the roof heat insulation waterproof structure in any one of Claims 1-3 characterized by providing a waterproof layer between the said roof concrete slab and a heat insulation layer.

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