JPS6227668B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a heat insulating material used in an outdoor rooftop insulation and waterproofing method, and more specifically, the present invention relates to a heat insulating material used in an outdoor rooftop insulation and waterproofing method, and more specifically, the present invention covers the heat insulating material with a film having a low water vapor permeability and a film having a high water vapor permeability. Concerning insulation materials for outdoor rooftop insulation and waterproofing. Conventionally, the holding method in the external insulation and waterproofing method for rooftops involves a structure in which a waterproof layer 11 is provided on the surface of concrete 10, a heat insulating material 12 is placed on top of the waterproof layer 11, and a holding layer 13 is provided from above. After rain, the insulation material 12 is immersed in water, so moisture accumulates within the insulation material 12 or on the waterproof layer 11, resulting in a significantly large temperature difference between the room temperature and the outside temperature. Sometimes, moisture condenses and accumulates inside the insulation material 12, which causes the insulation material 12 to
Often, the insulation performance cannot be maintained and deteriorates. It is estimated that the insulation performance will decrease by about 20% after 10 years of use. In view of these conventional problems, the inventor of the present invention aims to develop and provide a heat insulating material that does not deteriorate its heat insulation performance. The above problem was solved by packaging and sealing with a film. To explain the details of the present invention based on an illustrated embodiment, Fig. 2 is a perspective view of the heat insulating material A according to the present invention, and Fig. 3 is a cross-sectional view of the heat insulating material A shown in Fig. 2 after being installed. First, a heat insulating material (foamed plastic board in the example) 1 is manufactured into an appropriate shape (for example, rectangular), and is covered with heat-weldable films 2 and 3, and the peripheral edge 4 is heat-welded to form the film 2. , 3, the heat insulating material 1 is installed inside. Film 2 is the waterproof layer 5 on the roof.
A film with a low water vapor permeability, such as a film with a moisture permeation resistance at least 10 times greater than that of the heat insulating material, is used.This film includes polyethylene film, polypropylene film, and various aluminum vapor-deposited films. Single or multi-layered films, aluminum foil, etc. can be used, and the film 3 is arranged so as to be located on the pressing layer 6 side, and has a moisture permeability resistance equal to or lower than that of the heat insulating material 1. This is a film that does not allow water to pass through, but allows water vapor to pass through easily, and consideration should be given to using polystyrene film, nylon film, urethane film, etc. alone or in combination. Therefore, this heat insulating material is installed by arranging two films with low water vapor permeability on the waterproof layer 5 provided on the concrete 7, and placing a holding layer ( For example, by arranging the insulation material 1 facing the waterproof layer 2, even if water accumulates on the waterproof layer 2 after rain.
Since the film 2 with low water vapor permeability is placed on the surface, even if there is a significantly large temperature difference between the indoor side and the outside air side, internal condensation will not occur inside the insulation material 1 due to water on the waterproof layer 2. In addition, moisture accumulation in the insulation material 1 can be prevented and deterioration of insulation performance can be eliminated. Since it is made of silica, it does not impregnate into the heat insulating material 1 and cause moisture accumulation. In addition, since a film with low water vapor permeability is placed on the waterproof layer 5 side, and a film 3 that does not allow water to pass through but allows water vapor to pass through is placed on the presser layer 6 side, internal condensation occurs inside the insulation material 1 as shown in the graph. As it ages, it becomes difficult to accumulate moisture inside the insulation material, which prevents a decline in insulation performance. Note that when an aluminum vapor-deposited film is used as a film with a low water vapor permeability, the heat insulation performance can be improved not only by the water vapor blocking effect but also by the heat radiating effect. Next, the conventional heat insulating material and the inventive heat insulating material were
When we looked at the state of dew condensation that occurs in the structure shown in the figure under the following conditions, Figures 4 and 5
It was as shown in the diagram. Part 1: Temperature and humidity conditions when extruded styrene foam is used as insulation material

【table】 Numbers used in calculations

[Table] The results are as shown in the graph of FIG. 4, and the range where condensation occurs appears as dotted areas in the figure, indicating that internal condensation may occur in the heat insulating material. Part 2 When using the insulation material of the present invention as a heat insulation material Temperature and humidity conditions are the same as Part 1 Values used for calculation

【table】

[Table] The results are as shown in the graph of FIG. 5, and the range in which condensation occurs is not seen in the figure, indicating that no internal condensation occurs in the heat insulating material of the present invention. In addition, in FIGS. 4 and 5, a is the external air, b is the holding concrete, c is the extruded styrene foam plate, d is the temperature gradient, e is the saturated water vapor pressure line, f is the water vapor pressure line of the structure, g is the range where condensation occurs, and h is the heat insulating material of the present invention (an extruded styrene foam plate is interposed between the nylon film and the polyethylene film).

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional rooftop insulation construction example, Figure 2
The figure is a perspective view of the insulation material for outdoor rooftop insulation and waterproofing of the present invention.
Figure 3 is a cross-sectional view of the heat insulating material of the present invention installed, Figure 4 is a graph showing the range of condensation based on the saturated water vapor pressure line and the water vapor pressure line of the structure in the conventional example, and Figure 5 is a graph of the present invention. It is a graph showing the relationship between a saturated water vapor pressure line and a water vapor pressure line of a constituent body in the invention. 1... Insulating material, 2, 3... Film, 4... Peripheral edge, 5... Waterproof layer, 6... Pressing layer, 7... Concrete, 10... Concrete, 11... Waterproof layer, 12... Insulation material, 13...pressing layer.

Claims (1)

[Scope of Claims] 1. A film with low water vapor permeability is placed on one side of the heat insulating material, and a film that does not allow water to pass through but allows water vapor to pass through is placed on the other side, and the heat insulating material is wrapped by heat welding each side of the heat insulating material. Insulation material for outdoor rooftop insulation and waterproofing. 2. The insulation material for outdoor insulation and waterproofing according to claim 1, which is formed by disposing a film with low water vapor permeability on the side surface of the insulation material on the indoor side.