JPH0536014Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an exposed insulation and waterproof structure in which a heat insulating material layer and a waterproof layer are laminated on the surface of a building frame. A building that prevents tensile force from acting on the waterproof layer and accelerating its deterioration, allowing it to maintain good waterproofing effects over a long period of time, as well as maintaining good insulation effects. Regarding the exposed insulation and waterproof structure.

[Conventional technology]

In an exposed insulation and waterproof structure in which a heat insulating material layer and a waterproof layer are laminated on the surface of a building frame, for example, when applied to the roof of a building, the temperature of the bottom surface of the waterproof layer can rise to approximately 80°C in summer due to the influence of radiant heat from the sun. Therefore, we use urethane foam, polyethylene foam, etc., which have excellent heat resistance, as a heat insulating material, form this heat insulating material into a plate with standard dimensions, and lay it on the top of the rooftop slab to form the heat insulating layer. Generally, a waterproof layer is formed on the surface using asphalt roofing or the like.

[Problem that the invention attempts to solve]

However, in the exposed heat insulation waterproof structure configured in this way, especially when applied to the roof of a building frame as described above, the lower surface of the waterproof layer expands and bulges occur in the waterproof layer, resulting in a wavy pattern. There have been problems in that the appearance deteriorates over time, tensile force acts on the waterproof layer, accelerating deterioration, and in the worst case, cracks occur, making it impossible to expect the desired waterproof effect.

In addition, to address this issue, it was devised to use a special roofing system that allows air to circulate at the interface between the waterproof layer and the insulation layer, and to install a ventilation system that allows moisture to escape to the outside of the waterproof layer. However, due to the change in the construction process, another problem arose: construction costs became relatively high.

In view of these conventional problems, the exposed insulation and waterproof structure of buildings of the present invention was devised.
To easily prevent blisters from occurring in a waterproof layer without requiring any special construction process.

[Means for solving the problem] Until now, the cause of blistering in the above-mentioned waterproof layer has not yet been clearly investigated.
The inventors of the present invention arrived at the present invention by estimating the cause of these blisters as follows.

In other words, due to the influence of radiant heat from the sun in the summer, the temperature at the bottom of the waterproof layer instantaneously rises to approximately 80°C, and as a result, the moisture accumulated in the roof slab and the insulation layer is transferred from the indoor and outdoor sides. This moisture concentrates at the interface between the insulation layer and the waterproof layer and evaporates, causing blisters in the waterproof layer, and each plate-shaped insulation material is irradiated only on one side, causing dimensional changes and warping. It was thought that this was due to the edges of the roof peeling off from the roof slab, and especially blistering occurring in the waterproof layer on the joint surface of the insulation layer.

In addition, urethane foam and polyethylene fume, which have been widely used in the past, have a high moisture permeability coefficient, so they accumulate a lot of moisture, and because moisture permeates easily, this is thought to be the cause of blistering in the waterproof layer. Based on this, the inventors of the present invention decided to create a plate-shaped heat insulating material that has low moisture accumulation and is difficult for moisture to permeate, that is, has a low moisture permeability coefficient, and has a low dimensional change rate at approximately 80 degrees Celsius. We hypothesized that the above-mentioned blistering could be prevented from occurring in the waterproof layer by using a water-repellent material, and as a result of extensive research and experiments, we were able to confirm that it was effective and arrived at the present invention.

Specifically, a copolymer containing styrene and alpha methyl styrene or a copolymer of styrene and maleic anhydride is used as a resin material on the surface of the building frame, and the moisture permeability coefficient is 0.07 g/m ² . h・mmHg
Below, the dimensional change rate at a temperature of 80℃ is -
By laying a foam-molded plate-shaped insulation material so that the concentration is within the range of 0.15% to 0.15%, a heat insulation layer is provided, and a waterproof layer is further laminated on the surface of the insulation material layer. It was found that this effect can be expected.

[Effect]

However, the exposed insulation and waterproof structure of this building,
For example, when applied to the roof of a building structure, a copolymer containing styrene and alpha methyl styrene or a copolymer of styrene and maleic anhydride is used as a resin material with a moisture permeability coefficient of 0.07 g/m ² · h · mm.
Hg or less, and the plate-shaped insulation material is foam-molded and has standard dimensions so that the dimensional change rate at a temperature of 80℃ is within the range of -0.15% to 0.15%, and is laid on the top surface of the rooftop slab. In addition to forming a heat insulating material layer, a waterproof layer is formed on the surface of the heat insulating material layer by asphalt roofing, rubber asphalt roofing, or the like.

〔Example〕

The details of the exposed heat insulation waterproof structure of a building according to the present invention will be described below based on the attached drawings, illustrating the case where it is applied to the roof of a building frame.

In the present invention, a copolymer containing styrene and alpha methyl styrene or a copolymer of styrene and maleic anhydride is used as a resin material for the plate-shaped heat insulating material made of synthetic resin foam, and the moisture permeability coefficient is 0.07 g/
Foam molding is used so that the dimensional change rate at a temperature of 80°C is within the range of -0.15% to 0.15% ^, and the material is made of this material into a plate shape. It is formed to standard dimensions.

Thus, the plate-shaped heat insulating material 2... is laid on the upper surface of the rooftop slab 1 of the building frame shown in FIG. A waterproof layer 5 made of asphalt roofing is formed via an adhesive layer 4, and a heat insulating material layer and a waterproof layer are laminated on the surface of the building frame to form an exposed heat insulating waterproof structure for a building.

Here, the moisture permeability coefficient is set to 0.07 g/ ^m2・h・mmHg or less to ensure that moisture that migrates from the outside, such as rainwater, and moisture that migrates from the indoor side, such as water vapor, is blocked here. It's for a reason.

In addition, the dimensional change rate at a temperature of 80℃ was set within the range of -0.15% to 0.15% because the plate-shaped insulation material normally used in this type of exposed insulation waterproof structure
This is because the adhesive can expand and contract with the expansion and contraction of approximately ±1.35 mm of the plate-shaped heat insulating material, which is generally in the form of a square plate of mm square.

Note that 6 in the figure is a paint layer in which white paint or silver paint is applied to the upper surface of the waterproof layer 5 in order to reduce the radiant heat of the sun.

When forming the waterproof layer 5 after laying the plate-shaped heat insulating material 2 to form the heat-insulating layer 3, considering that the worker will be walking on the plate-shaped heat insulating material 2, it is necessary to It is known that a load of 1.0 to 1.8 times the worker's body weight is applied, and if the worker's weight is 55 kg,
Assuming that the contact area between the heel or toe and the floor is 5cm x 10cm = 50cm ² , the load on the floor is 55 x 1.8/55 = 1.98Kg/cm ² , so the compressive strength of the plate insulation material 2 is but
It is considered to use 2.0Kg/cm ² or more.

FIG. 2 shows a structure in which a joint sheet 7 made of a belt-shaped aluminum tape, iron tape, etc. is adhered to the joint surface between each plate-shaped heat insulating material 2 constituting the heat insulating material layer 3.

In this way, adhering the band-shaped joint sheet 7 to the joint surface between each plate-shaped heat insulating material 2... is effective in preventing the plate-shaped heat insulating material 2 from warping and the ends from peeling off from the top surface of the roof slab 1. It is.

Also, considering that the saturated water vapor pressure at 80℃ is 0.48Kg/ ^cm2 , the adhesive strength due to self-adhesion is approximately 80Kg/cm2.
Rubber asphalt roofing is used as a material for forming a waterproof layer that is higher than that at ℃, the adhesive layer 4 is omitted, and the rubber asphalt roofing is bonded to the heat insulating material layer 3 by lowering the melting point of the adhesion side. Sometimes, it is considered that the release paper is removed and the waterproof layer 5 is formed by self-adhering to the surface of the heat insulating layer 3.

Furthermore, using a urethane adhesive as an adhesive whose adhesive strength is 0.48Kg/ ^cm2 or higher even at 80℃,
Joint sheet 7 on the joint surface between each plate-shaped insulation material 2...
Then, rubber asphalt roofing is adhered to the surface of the insulation layer 3 and the surface of the joint sheet 7 to form the waterproof layer 5.
It is also considered to form a

In this way, the adhesive strength between the insulation layer 3 and the waterproof layer 4 is set at 80℃, and the saturated water vapor pressure at 80℃ is 0.48.
Kg/cm ² or more is more effective in preventing blisters from forming in the waterproof layer.

In the illustrated embodiment, the exposed heat-insulating waterproof structure of the present invention is applied to the roof of a building frame, but of course this does not prevent it from being applied to the side walls of a building frame.

[Effect of idea]

As is clear from the above description, the following effects are achieved. The moisture permeability coefficient is 0.07 for the plate-shaped insulation material.
Since we use a small material with a g/m ²・h・mmHg or less, we can reliably block moisture that migrates from the outside, such as rainwater, and moisture that migrates from the indoor side, such as water vapor, and also Since moisture does not enter and accumulate in the plate-shaped insulation material, unlike conventional methods, water vapor that evaporates and expands from the plate-shaped insulation material due to the radiant heat of the sun concentrates at the interface between the insulation layer and the waterproof layer. This pushes up the waterproof layer and causes blistering.
It becomes wavy and does not crack.
Furthermore, since the so-called high water content phenomenon does not occur in the plate-shaped heat insulating material, the heat insulating effect is not impaired, and furthermore, deterioration of the plate-shaped heat insulating material is prevented and durability is improved.

In addition, since we use plate-shaped insulation materials whose dimensional change rate at a temperature of 80°C is within the range of -0.15% to 0.15%, even when the temperature is raised to approximately 80°C due to the influence of radiant heat from the sun, The adhesive material bonding the plate-shaped heat insulating material and the waterproof layer can only expand and contract within a range that can be followed, and the waterproof layer is less likely to break due to being unable to follow the expansion and contraction of the plate-shaped heat insulating material.

In addition, a copolymer containing styrene and alpha methyl styrene or a copolymer of styrene and maleic anhydride is used as a resin material for the plate-shaped heat insulating material.
Since foam molding is used, the moisture permeability coefficient is lower than that of urethane foam or polyethylene foam, which have been widely used in the past, and in addition to achieving the above-mentioned effects, it also contributes to cost reduction.

Furthermore, using the dry construction method, construction is not affected by the external environment and the construction period is constant.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing an example of applying the exposed heat insulation waterproof structure of the present invention to the roof of a building frame;
The figure is a longitudinal sectional view showing another embodiment. 1...Rooftop slab, 2...Plate insulation material, 3...
Heat insulating layer, 4...Adhesive layer, 5...Waterproof layer, 6...
...paint layer, 7... joint sheet.

Claims (1)

[Scope of utility model registration request] A copolymer containing styrene and alpha methyl styrene or a copolymer of styrene and maleic anhydride is used as a resin material on the surface of the building frame.
The moisture permeability coefficient is 0.07g/ ^m2・h・mmHg or less, and the dimensional change rate at a temperature of 80℃ is -0.15%.
This is an exposed insulation and waterproof structure for buildings, in which a foam-molded plate-shaped insulation material is laid down within the range of 0.15%, a insulation layer is provided, and a waterproof layer is further laminated on the surface of the insulation layer.