JPH0723117U - Humidity control outer wall structure - Google Patents

Abstract

(57) [Summary] [Purpose] It is intended to provide a vented outer wall structure capable of performing heat insulation and dew protection on the inner surface of the outer wall in the winter and heat insulation and dew formation on the inner and outer surfaces of the inner wall in the summer, even in areas with high temperature and humidity in the summer . [Structure] The heat insulating layer 3 is provided on the outer surface of the inner wall material 1 with the moisture-proof layer 2 interposed therebetween.
In the humidity control outer wall structure in which the outer wall material 5 is provided on the outer surface of the heat insulating layer 3 through the space 4, the moisture resistance of the moisture resistant layer 2 provided on the outer surface of the inner wall material 1 is 210 m ² hmmHg / g or more. ,
A waterproof base material 6 having a moisture permeability resistance of 1.0 m ² hmmHg / g or less is provided on the inner surface of the outer wall material 5, and the moisture permeability resistance of the outer wall material 5 is 1.5 m ² hmmHg / g or less. Moisture permeability of 5A is 250g
/ m ³ · 24h or more.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a humidity control outer wall structure.

[0002]

[Prior art]

 Conventionally, as a ventilated outer wall structure for heat insulation and dehumidification in an area that is extremely cold in winter, for example, an area mainly in Hokkaido, as shown in Fig. 4, moisture from the outside is applied to the outer surface of the inner wall material 1 made of plywood, gypsum board, or the like. Is provided with a heat insulating layer 3 such as a foamed resin plate or glass wool through a moisture-proof layer 2 that allows water vapor from the inside to pass therethrough, and a waterproof substrate 4A is provided on the outer surface of the heat insulating layer 3, A vented outer wall structure is known in which an outer wall member 5 made of a fiber-reinforced cement board or the like coated on the outer surface is provided on the outer surface of the base material 4A via a ventilated space 4 that opens from the building base to the eaves. In this ventilation outer wall structure, when the outdoor temperature is lower than the indoor temperature, the indoor temperature is insulated by the heat insulation layer 3 provided on the outer surface of the inner wall material 1, and the moistureproof layer provided between the heat insulation layer 3 and the inner wall material 1. 2 and the waterproofing base material 4A provided on the outer surface of the heat insulating layer 3 prevent water vapor in the room from being transmitted to the outside, and the water vapor permeated from the seam of the moistureproof layer 2 or a leak portion which is unavoidably caused by construction from the ventilation space 4 It is released to the outside to dry the inner surface of the outer wall and to exert the effect of preventing dew condensation.

[0003]

[Problems of conventional technology]

 The above-mentioned ventilation outer wall structure has been applied to other regions other than Hokkaido in a manner that takes into account the respective temperature conditions, but in areas where the outside air atmosphere is hot and humid in the summer, due to indoor cooling, etc. An unexpected problem arose. In other words, this was not a problem in Hokkaido, where there is no summer rainy season and the summer is not so hot and humid. The relationship between temperature and humidity inside the outer wall is completely opposite to that in winter, and there is a problem that the winter type ventilation outer wall structure for heat insulation and dew formation causes a large amount of dew condensation on the inner and outer surfaces of the inner wall material 1 in the summer. occured.

[0004]

[Problems to be solved by the device]

 In view of the above problems, the present invention aims to provide a humidity-controlled outer wall structure capable of performing heat insulation and dew condensation on the inner surface of the outer wall in the winter and heat insulation and dew formation on the inner surface of the inner wall in the summer even in a hot and humid area in the summer. It was made as.

[0005]

[Means for Solving the Problems]

That is, in the humidity control outer wall structure of the present invention, the outer wall surface of the inner wall material 1 is provided with the heat insulating layer 3 via the moisture barrier layer 2, and the outer surface of the heat insulating layer 3 is provided with the outer wall material 5 via the space 4 to form the humidity controlling outer wall. In the structure, the moisture-proof layer 2 provided on the outer surface of the inner wall material 1 has a moisture-proof resistance of 210 m ² hmmHg / g or more, and the inner surface of the outer wall material 5 has a waterproof base material 6 having a moisture-permeable resistance of 1.0 m ² hmmHg / g or less. In addition to being provided, the moisture resistance of the outer wall material 5 is 1.5 m ² hmmHg / g or less, and the moisture permeability of the outer coating film 5A is 250 g / m ³ · 24 h or more. Is.

[0006]

[Action]

In the humidity control outer wall structure of the present invention, the moisture resistance of the moisture barrier layer 2 provided on the outer surface of the inner wall material 1 is 210 m ² hmmHg / g or more, as compared with the conventional humidity control outer wall structure. This moisture-proof resistance prevents water vapor on the outer surface of the inner wall material 1 from penetrating into the inner wall material, and at the same time acts to appropriately block outdoor permeation of indoor water vapor, thereby preventing dew condensation on the outer surface of the inner wall material 1. When the above-mentioned moisture permeation resistance is lower than 210 m ² hmmHg / g, this dew condensation water permeates the outside of the inner wall material 1 and the dew condensation on the outer surface of the inner wall material 1 cannot be prevented.

The heat insulating layer 3 and the space 4 are the same as in the conventional ventilated outer wall structure, but a waterproof base material 6 having a moisture permeability resistance of 1.0 m ² hmmHg / g or less is provided on the inner surface of the outer wall material 5. The waterproof base material 6 allows water vapor to pass through but does not allow water from the outside to pass through. Specifically, it is a ventilation waterproof sheet or the like, and actively discharges the water vapor in the ventilation space 4 to the outside. If the above-mentioned moisture permeation resistance is made larger than 1.0 m ² hmmHg / g, the water vapor in the ventilation space 4 cannot be sufficiently diffused.

The outer wall material 5 has a moisture permeability resistance of 1.5 m ² hmmHg / g or less, and the outer coating 5 A has a moisture permeability of 250 g / m ³ · 24 h or more. The reason is that the water vapor discharged from the ventilation space 4 is easily contained in the outer wall material 5, and the water vapor is temporarily absorbed to have a function of preventing dew condensation. Further, the moisture permeability of the outer coating film 5A is set to 250 g / m ³ · 24h or more so that water such as raindrops is prevented from directly permeating from the outside and the impregnated water vapor is released to the outside over time. Therefore, if it is lower than 250 g / m ³ · 24 h, it is suitable for water vapor emission inside the outer wall material 5, but water permeation from the outside cannot be sufficiently prevented and dew condensation inside the humidity control outer wall structure occurs. It cannot be prevented enough.

Due to the synergistic effect of the moisture-proof resistance of the moisture-proof layer 2 and the moisture permeability of the waterproof base material 6 and the outer wall material 5 and the outer coating film 5A, the dew condensation inside the humidity-controlled outer wall under the hot and humid atmosphere in summer is effectively prevented. is there. In winter, since the heat insulating layer 3 and the moisture proof layer 2 are present inside the room with the ventilation space 4 in between, the heat insulating and dew proofing action is exhibited as in the conventional case.

[0010]

【Example】

 Next, an embodiment of this invention will be described. FIG. 1 is a sectional view of an embodiment of the present invention.

(Example) A heat insulating layer 3 made of foamed synthetic resin having a thickness of 50 mm is provided on the outer surface of an inner wall material 1 having a thickness of 10 mm, which is made of plywood, via a moisture proof layer 2 having a moisture proof resistance of 210 m ² hmmHg / g. On the outer surface of the heat insulating layer 3, a waterproof base material 6 of a breathable waterproof material having a moisture permeability resistance of 0.8 m ² hmmHg / g is provided through the space 4 having a thickness of 50 mm, and the moisture permeability resistance is 1.5 m ^{2 on the} outer surface thereof. The moisture control outer wall structure was constructed by fixing the outer wall material 5 composed of a fiber reinforced cement plate having a moisture permeability of 250 g / m ³ · 24 h of hmmHg / g or less and the outer coating 5A. The outer wall material 5 used had the properties shown in FIG. 2 and the water content shown in FIG.

(Comparative Example) A heat insulating layer 3 made of the same foam synthetic resin as that of the embodiment is provided on the outer surface of an inner wall material 1 made of plywood having a thickness of 10 mm via a moisture proof layer 2 having a moisture proof resistance of 150 m ² hmmHg / g. A waterproof base material 4A is provided on the outer surface of the heat insulating layer 3, and an outer wall material 5 made of a fiber-reinforced cement plate is fixed to the outer surface of the heat insulating layer 3 via a space 4 having a thickness of 50 mm as in the embodiment to form a ventilation outer wall structure. .

Regarding the examples and comparative examples, when the outside temperature of the wall is −10 ° C. and the inside temperature of the inside is 25 ° C. as the test condition 1, the outside temperature is 30 ° C. and the outside wall surface temperature is 70 ° C. as the test condition 2. As shown in the table below, the outside surface is irradiated with an infrared lamp and the indoor temperature is set to 25 ° C. In both test conditions 1 and 2, 100cc / 1m ² of water is sprayed on the indoor and outdoor sides at the start of the test. After spraying for 1 hour, the state of dew condensation inside the wall was observed. As a result, in the case of the example, no condensation was formed on the inside of the humidity-controlled outer wall under the test conditions 1 and 2, but in the case of the comparative example, the inside of the humidity-controlled outer wall and the inner wall were measured under the test condition 2. It was observed that dew condensation occurred on the surface of Material 1.

[0014]

[Effect of device]

 As described above, according to the humidity control outer wall structure of the present invention, dew condensation occurs inside and outside the room when the temperature difference between the inside and the outside is low as well as when the outside temperature is high. Therefore, even in a hot and humid environment, adiabatic and dew protection in a dry and good condition is possible.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the water absorption rate of the outer wall material of the example and the number of elapsed days.

FIG. 3 is a graph showing the relationship between the water content of the outer wall material and the number of days elapsed in the example.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner wall material 2 ... Moisture-proof layer 3 ... Heat insulation layer 4 ... Ventilation space 5 ... Outer wall material 5A ... Outer surface coating film 6 ... Waterproof base material

Claims (1)

[Scope of utility model registration request] 1. A heat insulating layer 3 is provided on an outer surface of an inner wall material 1 with a moisture-proof layer 2 interposed therebetween, and an outer wall material 5 is provided on an outer surface of the heat insulating layer 3 with a space 4 interposed therebetween.
In the humidity control outer wall structure, the moisture barrier resistance of the moisture barrier layer 2 provided on the outer surface of the inner wall material 1 is 210 m ² hmmHg / g or more, and the moisture permeability resistance is 1.0 m ² hmmHg / g on the inner wall material 5. The following waterproof base material 6 is provided, the moisture permeability resistance of the outer wall material 5 is 1.5 m ² hmmHg / g or less, and the moisture permeability of the outer coating film 5A is
Humidity control outer wall structure characterized by being set to 250 g / m ³ · 24 hours or more.