JPS6123561Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a heat insulating floor structure for a house that utilizes the infrared reflection performance of a thin aluminum layer and its high moisture permeability due to its large number of through holes. Conventionally, inorganic fiber insulation materials such as glass wool and rock wool, or organic foams such as styrene foam and urethane foam have been generally used to insulate the floors of houses. However, the former easily absorbs moisture from the ground and is difficult to evaporate once it reaches the dew point, so it becomes hydrated and its insulation properties are greatly reduced. Furthermore, during construction, it is necessary to take measures such as installing a waste board under the joists, stretching a net under the joists, and placing glass wool or rock wool on top of it, so it is called double construction. Workability is not good in this respect. On the other hand, the latter is particularly likely to generate toxic gas in the event of a fire, so it is not preferable to use it inside the house, such as on the floor. This invention was completed as a result of intensive research to solve the above-mentioned drawbacks of conventional insulation materials.
The gist is that a thin aluminum layer with an infrared reflectance of 50% or more is laminated on one or both sides of the base material with the reflective surface facing outward, and the through-hole diameter is 1 mm or more.
20mm, and the through hole area ratio to the whole is 0.1~
A floor structure characterized in that a laminate having penetration holes of 5% and 5% is disposed with a desired space under the floorboard so that at least the aluminum thin layer side faces the floorboard. be. The present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of one embodiment of the floor structure according to the present invention, and the reference numeral 1 in the figure is a large drawer. On the upper surface of the drawer 1, an aluminum foil laminate 2, which has an aluminum foil on both sides of the base material with its high infrared reflectance side facing outward, and has a large number of through holes, is stretched with a tassel. On top of this, joists 3 (45 x 50 mm) are provided at appropriate intervals. A rough floor board 4 is provided with a space equal to the thickness of the joist 3, and a finished floor board 5 is placed on the upper surface thereof. As mentioned above, it is preferable to place the aluminum foil laminate 2 on the top surface of the main drawer 1, but since there are cases where a heat insulating structure is created after the floor construction, in that case it is also possible to place it on the bottom surface of the main drawer 1. be. Furthermore, instead of tacking the aluminum foil laminate 2, nails, adhesives, and other various methods may be used. The laminate having a thin aluminum layer as referred to in the present invention is a thin aluminum layer such as an aluminum foil or an aluminum vapor-deposited layer having a high reflectance laminated on one or both sides of a base material such as a wooden board, kraft paper, or synthetic resin sheet. Refers to something with many through holes. In this case, unless the infrared reflectance of the aluminum layer is at least 50%, it will not be as effective as a commonly used heat insulating material, such as glass wool. Note that a clear coat may be applied on the thin aluminum layer to increase durability as long as the reflectance is maintained at 50% or more. Furthermore, the reason why a thin aluminum layer is used as a laminate is to take advantage of the rigidity of a base material such as kraft paper, and to prevent sagging, wrinkles, etc. from occurring during construction. Therefore, the base material to be laminated may be any material as long as it meets the above purpose, and in addition to the above-mentioned base materials, for example, wood boards, plastic sheets, paperboard, glass cloth, natural fibers, synthetic fibers, etc. that have a certain degree of rigidity or more can be used. It is fine as long as it is equipped. On the other hand, the through holes formed in the laminate 2 in the present invention refer to holes that are moisture permeable and water permeable and do not significantly affect the infrared reflectance.
Without these through holes, the thin aluminum layer would not have moisture permeability, so moisture generated from indoors could condense on the aluminum layer and reduce the infrared reflectance. However, by providing the above-mentioned through holes, dew condensation can be prevented. In this case, if the individual size of each through-hole and the area ratio of the through-hole to the entire laminate exceed a certain value, the insulation properties will decrease; conversely, if these values are very small, It has low moisture permeability and cannot prevent condensation. As a result of intensive exploration of these relationships, the hole diameter of the through hole was 1 mm.
If the area ratio of the total area occupied by the through holes to the entire area of the laminate 2 is 0.1% to 5%, sufficient moisture permeability can be obtained to prevent condensation. It was also found that the decrease in heat insulation properties was within 5%, and there was no problem in practical use. FIG. 2 is a longitudinal cross-sectional view of an example of the aluminum foil laminate 2 used in the present invention, cut through its through hole, and the infrared reflectance is 94% on both sides of the kraft paper 2a (80 g/m ² ). Aluminum foil 2b (7
μ thickness) with its high reflectance surface facing outward using a polyethylene adhesive film (not shown),
Furthermore, a clear coat 2c (1μ of acrylic resin) is applied to protect the aluminum foil surface. In addition, through holes 2d with a diameter of 3 mm are provided at 3 cm intervals, and the area ratio of the area occupied by the through holes to the entire area is 0.8%.
It is becoming. For comparison, FIG. 3 shows a vertical cross-sectional view of a floor structure equipped with glass wool of 50 mm thickness, which has been commonly used in the past. Lay glass wool 7 (50 mm thick) between the joists 3 (45 to 50 mm) attached to the top of the floorboard 1 via the sacrificial board 6, and place the rough floorboard 4 on top of it.
(thickness 18mm), and then finish the floorboard 5 on top of that.
(thickness: 7 mm). Next, the effects of the floor structure according to the present invention configured as described above will be explained. The first effect is that the floor structure according to the present invention has a high thermal penetration resistance. There is a downward flow of heat from above the floor to below the floor, and an opposite upward heat flow in the movement of heat between the above floor and below the floor via the floor structure, but the temperature under the floor of a house is usually lower than above the floor. Since this is often the case, we measured the movement of downward heat flow to examine the insulation properties. The samples used for measurement were the floor structure shown in Fig. 1 according to the present invention using the laminate 2 shown in Fig. 2, and the conventional floor structure shown in Fig. 3.The measurement method was JIS It started on A1414. The measurement results are shown in Table 1.

[Table] Table 1 shows the measurement results at a relative humidity of 65%, and as is clear from the values, when the floor structure of the present invention is used, the heat flow resistance is higher than that of the floor structure using conventional glass wool insulation. It can be seen that this corresponds to the case where the ratio is 0% (volume), which is good. Furthermore, in the case of conventional glass wool insulation materials, the heat flow resistance is shown to decrease significantly as the water content increases, which is not preferable. In addition, in the case of the structure according to the present invention, the laminate 2
No water droplets formed on the top. Next, Table 2 shows heat flow resistance, water droplet generation, and moisture permeability when the aluminum foil laminate 2 shown in FIG. 2 with only the through-hole conditions changed is applied to the floor structure according to the present invention shown in FIG. percentage etc.

[Table] As mentioned above, the floor structure according to the present invention has higher heat flow resistance and higher moisture permeability than conventional ones, so water droplets do not form on the aluminum foil laminate. To provide a floor structure that is suitable for the energy-saving era, since indoor heat retention is always good and the infrared reflectance of the aluminum layer does not decrease. The second effect of the present invention is that it is much easier to construct than conventional floor structures. For example, in the floor structure of the present invention (Fig. 1), the aluminum foil laminate 2 is placed on the floor after construction, and then the joists 3 and floorboards 4, 5 are nailed. It takes about 1 hour for a 6 tatami room, and about 10 minutes to put up the aluminum foil laminate. On the other hand, in the conventional floor structure (Fig. 3), after the rough construction, the waste board 6 and the joist 3 are constructed, and the glass wool 7 is placed on this, and the floor boards 4 and 5 are installed.
However, it takes about 1 hour and 30 minutes for a 6-tatami room after the construction, and it takes about 30 minutes to put up the waste board 6 and place the glass wool 7 on it.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a floor structure showing an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of an example of an aluminum foil laminate used in the present invention, and Fig. 3 is a longitudinal cross-section of a conventional floor structure. It is a diagram. 1... Large pull, 2... Aluminum foil laminate,
2a...Kraft paper, 2b...Aluminum foil,
2c...Clear coat, 2d...Through hole, 3...
Joist, 4... Rough floor board, 5... Finished floor board, 6...
Discarded board, 7...Glass wool.

Claims (1)

[Scope of utility model registration request] A thin aluminum layer with an infrared reflectance of 50% or more is laminated on one or both sides of the base material with the reflective surface facing outward, and the through-hole diameter is 1 mm to 20 mm, and the through-hole area ratio to the whole is 0.1% to 5%. 1. A floor structure characterized in that a laminate having through-holes distributed therein is disposed on the lower surface of the floorboard with a desired space therebetween so that at least the aluminum thin layer surface faces the floorboard.