JPH06288069A - Mounting structure of floor backing material - Google Patents

Abstract

PURPOSE:To facilitate construction work, and what is more, protect insulation performance from being degraded by long time service after the execution of construction work. CONSTITUTION:An insulation material 2 is mounted to the rear side of a board 1 while both ends of the board 1 in the lateral direction is adapted to project more outward than both ends of the insulation material 2, thereby forming a fixing piece 3. A drop prevention sheet 4, which covers the rear side of the fixing piece 3 and the sides and the rear side of the insulation material 2, is mounted to the board 1 and the insulation material 2, thereby forming a floor backing material 6. The insulation material 2 of the under-floor backing material 6 is fitted between floor joists 5, 5 while the fixing piece 3 of the under-floor backing material 6 is fixed with the top of the floor joists 5. The floor backing material 6 to which the insulation material 6 is mounted is loaded on the floor joists 5, thereby forming an under-floor backing having an insulation performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a floor base material having a heat insulating function.

[0002]

2. Description of the Related Art Conventionally, based on the provisions of the "Act on the Rational Use of Energy" of June 1979,
In February 1993, "the judgment criteria of the building owner regarding the rationalization of the energy use related to the house" and "the guidelines for the design and construction concerning the rationalization of the energy use related to the house" were formulated and announced, and the heat insulation structure of the house was Has been promoted. In recent years, due to the increase in demand for consumer energy and the occurrence of global environmental problems, the above provisions were completely revised. One of the revised contents is the standard of heat loss coefficient. This is related to the strengthening of the housing, and this has made it necessary to improve the heat insulation function of the housing more than ever before.

Conventionally, a structure of a floor base using a heat insulating material has been widely used in order to improve the heat insulating function of the floor. Figure 8 (a)
An example of this is shown in FIG. 5, in which the heat insulating material receiver 14 is provided on the side surface of the joist 5 and the both ends of the heat insulating material 2 bound with a thread or a PP band are locked to the heat insulating material receiver 14 to fix the heat insulating material 2 to the joist 5. It is fitted with a space between them, and the joists 5 are placed so as to cover the heat insulating material 2.
A floor base was formed by placing the base plate 15 on the upper surface of the.

[0004]

However, in the above-mentioned conventional example, since the heat insulating material 2 is arranged between the joists 5, the heat insulating material receiver 1 is provided.
4 had to be attached to joists 5, which increased the construction process on site. Moreover, the dimension between the joists 5 is the heat insulating material 2
If the width is smaller than the width, the heat insulating material 2 becomes difficult to fit between the joists 5, and the heat insulating material 2 may be damaged in some cases. In particular, when rock wool is used as the heat insulating material 2, the rock wool has low rigidity when formed into a plate shape due to its characteristics such as fiber diameter, and is damaged when it is fitted between the joists 5 and 5 as shown in FIG. 8 (b). It was easy to do. Further, after the floor base is constructed, the joists 5 contract due to drying and the dimension between the joists 5 increases, which causes the heat insulating material 2 to fall, and the fall of the heat insulating material 2 reduces the heat insulating performance of the floor base. I was afraid to do it.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a structure for attaching a floor base material which is easy to carry out and does not have a risk of deteriorating the heat insulation performance after long-term use. It is what

[0006]

According to the structure for mounting a floor base material of the present invention, a heat insulating material 2 is attached to the back surface of a substrate 1 and both lateral ends of the substrate 1 are laterally opposite both ends. To form a fixed piece 3 by protruding more outward than the fixed piece 3 and attaching a fall prevention sheet 4 covering the back surface of the fixed piece 3 and the side surface and the back surface of the heat insulating material 2 to the substrate 1 and the heat insulating material 2 to fix the floor base material 6. It is characterized in that the heat insulating material 2 of the floor base material 6 is fitted between the joists 5 and 5, and the fixing piece 3 of the floor base material 6 is fixed to the upper surface of the joist 5.

In addition, in the mounting structure of the floor underlaying material according to the present invention, one end portion of the heat insulating material 2 provided on the floor underlining material 6 in the vertical direction is projected outward from the end portion of the substrate 2. Forming the portion 8 and providing a recess 9 at the other longitudinal end of the heat insulating material 2, disposing another floor base material 6 in the longitudinal direction of the floor base material 6 and providing it on one floor base material 6. It is characterized in that the projection 8 is fitted with a recess 9 provided in the other floor base material 6.

Further, in the mounting structure of the floor base material according to the present invention, the tongue piece 10 is provided on one longitudinal end 7 of the floor base material 6.
Is provided so as to project, a groove 11 is provided at the other end portion 7 of the floor base material 6 in the vertical direction, and another floor base material 6 is disposed in the vertical direction of the floor base material 6 and one of the floor base materials is provided. It is characterized in that the tongue piece 10 provided on the No. 6 is inserted with the concave groove 11 provided on the other floor base material 6.

Further, in the present invention, the heat insulating material 2 may be provided with a vertical slit 12 and the heat insulating material 2 may be cut along the slit 12. Further, in the present invention, the damping material 13 may be provided between the fixing piece 3 of the floor base material 6 and the joist 5.
In addition, in the present invention, rock wool may be used as the heat insulating material 2.

[0010]

The heat insulating material 2 is attached to the back surface of the substrate 1, and the lateral end portions of the substrate 1 are projected further outward than the lateral end portions of the thermal insulating material 2 to form the fixing piece 3, and the fixing piece 3 is formed. Of the floor base material 6 is formed by attaching the fall prevention sheet 4 covering the back surface of the base material and the side surface and the back surface of the heat insulating material 2 to the substrate 1 and the heat insulating material 2 to form the floor base material 6 between the joists 5 and 5. Since the fixing piece 3 of the floor base material 6 is fixed to the upper surface of the joist 5 while being fitted, the floor base material 6 having the heat insulating material 2 is placed on the joist 5 to form a floor base having a heat insulating property. Therefore, it is possible to eliminate the need for providing the joist 5 with a member for receiving the heat insulating material 2. Further, by covering and holding the back surface of the heat insulating material 2 with the fall prevention sheet 4, it is possible to prevent the heat insulating material 2 from falling off the substrate 1 even if the heat insulating material 2 is peeled off from the substrate 1.

In addition, one end portion of the heat insulating material 2 provided on the floor base material 6 in the vertical direction is projected outwardly from the end portion of the substrate 1 to form a protrusion 8 and the heat insulating material 2 is formed in the vertical direction. A recess 9 is provided at the other end of the floor base material 6, another floor base material 6 is disposed in the longitudinal direction of the floor base material 6, and the projection 8 provided on one floor base material 6 is provided on the other floor base material 6. Since the provided recessed portion 9 is inserted, even if the floor base material 6 is arranged in the vertical direction to form the floor base material, the protrusion 8 of the heat insulating material 2 does not cause a gap between the end portions 7 of the floor base material 6. Therefore, the heat insulation performance of the floor base can be improved, and the occurrence of dew condensation can be prevented.

Further, a tongue piece 10 is provided so as to project at one end portion 7 of the floor base material 6 in the vertical direction, and a groove 11 is provided at the other end portion 7 of the floor base material 6 in the vertical direction. Another floor base material 6 is arranged in the longitudinal direction of the material 6 and the tongue piece 10 provided on one floor base material 6 is provided with the groove 1 provided on the other floor base material 6.
Since 1 is inserted, even if the floor base materials 6 are arranged in the vertical direction to form the floor base material, the tongue pieces 10 are used to form the end portions 7, 7 of the floor base material 6.
It is possible to prevent the formation of a gap between them, it is possible to improve the heat insulation performance of the floor base, and it is possible to prevent the occurrence of dew condensation.

Further, since a vertical slit 12 is provided in the heat insulating material 2 and the heat insulating material 2 is formed so as to be cut along the slit 12, when the dimension between the joists 5 and 5 is smaller than the width dimension of the heat insulating material 2. Even in this case, it is not necessary to cut the heat insulating material 2 with a cutter or the like in the field, and the heat insulating material 2 can be peeled off from the substrate 1 by hand, and the burden of construction can be reduced. Further, since the damping material 13 is provided between the fixing piece 3 of the floor base material 6 and the joist 5, the vibration can be reduced by the vibration damping material 13 even if vibration is applied to the floor base material 6, and the heat insulating material In addition to the sound absorbing effect of 2, the sound damping performance of the floor base material 6 can be improved by the vibration damping material 13.

In addition, since rock wool is used as the heat insulating material 2, the floor base material 6 can be formed at a lower cost than using a heat insulating material such as glass wool or expanded styrene.

[0015]

EXAMPLES The present invention will be described in detail below with reference to examples. The substrate 1 has been conventionally used as a floor base, and is made of a material having rigidity and moisture resistance capable of supporting a floor surface material, and is not particularly limited to these, and for example, wood Boards, plywood, plastic plates, metal plates, inorganic plates, etc. may be used. When a moisture-permeable material such as wood board, plywood, inorganic board, perforated plastic board or metal board is used as the substrate 1, a polyethylene film or the like is formed on the upper surface of the substrate 1 which is the indoor side after construction. A moisture-proof layer to be formed is provided.

Rock wool is used as the heat insulating material 2. The reason for this is that due to the strengthening of the standard of the heat loss coefficient of the heat insulating material in order to improve the heat insulating performance of the house as described above, other heat insulating materials such as glass wool and expanded styrene have higher grades than before. Although it was necessary to use rock wool, it is not necessary to use a higher grade of rock wool, so it is better to use rock wool that is relatively cheaper than glass wool or expanded styrene etc. This is because 6 can be formed at low cost. The density, thickness, etc. of the rock wool used in the present invention are not particularly limited and are selected according to the construction site. The width dimension of the heat insulating material 2 is smaller than the width dimension of the substrate 1.

The fall prevention sheet 4 is made of a non-woven fabric such as glass and is formed so as not to be deteriorated or damaged by long-term use. Then, on the back surface of the substrate 1, the heat insulating material 2 is adhered to a portion other than the back surface of both ends in the horizontal direction of the substrate 1 with a rubber adhesive, and the both end portions in the horizontal direction of the substrate 1 where the heat insulating material 2 is not adhered Is formed as a fixed piece 3,
A floor base as shown in FIG. 2 is obtained by adhering the fall prevention sheet 4 with a rubber adhesive so as to cover the back surface of the fixing piece 3 of the substrate 1 and the lateral side surface and back surface of the heat insulating material 2. The material 6 is formed.

FIG. 1 shows a floor base material formed of the floor base material 6. The heat insulating material 2 provided on the floor base material 6 is fitted between the joists 5 and 5, and the fixing piece 3 of the floor base material 6 is fixed. Is fixed by hammering nails on the upper surface of joist 5.
The floor base material 6 is placed on the above to form a floor base. Then, a floor surface material such as a wooden floor is attached on the substrate 1 of the floor base material 6 to form a floor.

When the floor base material is formed using such a floor base material 6, since the substrate 1 and the heat insulating material 2 are bonded and fixed, there is no need to attach a member for supporting the heat insulating material 2 to the joist 5. Further, the heat insulating material 2 can be attached at the same time by merely placing the floor base material 6 on the joists 5, and the burden of construction at the site can be reduced. Further, the back surface of the heat insulating material 2 is covered with the fall prevention sheet 4 to hold the heat insulating material 2 on the back surface of the substrate 1, and both side ends of the fall prevention sheet 4 are firmly sandwiched between the board 1 and the joist 5. Since it is fixed, even if the heat insulating material 2 is separated from the substrate 1 even after long-term use, the heat insulating material 2 is prevented by the fall prevention sheet 4.
Can be prevented from falling off the substrate 1.

A specific example of the floor base material 6 will be described below.
The substrate 1 has a size of 300 mm × 1818 mm,
A 2.7 mm thick MDF (medium density fiberboard) is used, and a polyethylene film having a thickness of 9 μm and having aluminum vapor-deposited thereon is provided on the surface thereof. The lateral dimension of the substrate 1 must be such that the fixing pieces 3 and 3 of the substrate 1 can be fixed over the joists 5 and 5, respectively. If so, the substrate 1 may be formed with a lateral dimension of 258 mm to 303 mm. In this specific example, 30 considering the construction error (prevention of overlap), etc.
It was set to 0 mm.

As the heat insulating material 2, 258 mm × 1818
Rock wool having a size of 40 mm, a thickness of 40 mm and a density of 30 kg / m ³ is used. In this example, the density and thickness corresponding to the IV area and other wooden construction first floor wooden floors, which are specified in the new energy conservation standards, are used. The lateral dimension of the heat insulating material 2 needs to be narrower than the dimension between the joists 5 and 5, but considering the dimensional error between the joists 5 and 5 and that the rock wool as the heat insulating material 2 can be compressed. , Joists 5, 5
It may be about 5 mm wider than the space between them. Insulation 2
Substrate 1 by setting the lateral dimension of 258 mm.
It is possible not to cover the back surfaces of both lateral ends of each of the fixing pieces 3 by about 21.5 mm.
Becomes

Then, the heat insulating material 2 is adhered to a substantially central portion in the lateral direction of the substrate 1 with a rubber adhesive, and the fall prevention sheet 4 is attached in the same manner as in the above-mentioned embodiment to form the floor base material 6. It is something. FIG. 3 shows another embodiment, in which the heat insulating material 2 is attached to the back surface of the substrate 1 in the floor base material 6 of the above embodiment while being displaced in either the vertical direction of the substrate 1 or the like. Is formed in the same manner as the floor base material 6 of the above embodiment. In the floor base material 6 thus formed, the end portion of the heat insulating material 2 projects outward from one end portion 7 of the substrate 1 in the vertical direction, and the projecting portion is used as the projection portion 8. It is formed as. Substrate 1
A concave portion 9 to which the heat insulating material 2 is not attached is formed on the back surface of the other end portion 7 in the vertical direction.

In constructing the floor base material 6, the floor base materials 6 are laterally arranged to form the floor base material in the same manner as in the above-described embodiment. In the construction for arranging the floor base materials 6 in the vertical direction to form the floor base material, another floor base material 6 is arranged in the vertical direction of the floor base material 6 placed on the joists 5, and one of the floor base materials is placed. 6 is inserted into the recess 9 of the other floor base material 6, and the other floor base material 6 is placed on the joist 5.

By performing the construction in this way, the heat insulating material 2
It is possible to prevent a gap from being formed between the end portions 7, 7 of the floor base materials 6, 6 by the projecting portions 8 of the floor base materials 6, so that the heat insulation performance of the floor base material is improved and the occurrence of dew condensation can be prevented. . FIG. 4 (a) shows still another embodiment, in which one longitudinal end face of the floor base material 6 of the above embodiment has a tongue piece 10 projecting over the entire length of the end face. On one end face of the floor base material 6 in the vertical direction, a groove 11 is provided over the entire length of the end face. As shown in FIG. 4B, the tongue piece 10 is attached by holding its base portion 16 between the substrate 1 and the heat insulating material 2.

In constructing the floor base material 6, the floor base materials 6 are laterally arranged to form the floor base material in the same manner as in the above-described embodiment. In the construction for arranging the floor base materials 6 in the vertical direction to form the floor base material, another floor base material 6 is arranged in the vertical direction of the floor base material 6 placed on the joists 5, and one of the floor base materials is placed. This is done by inserting the tongue piece 6 of No. 6 into the groove 11 of the other floor base material 6 and placing the other floor base material 6 on the joist 5.

The tongue piece 10 thus constructed
Therefore, it is possible to prevent a gap from being formed between the end portions 7, 7 of the floor base materials 6, 6, so that the heat insulation performance of the floor base material is improved and the occurrence of dew condensation can be prevented. In the floor base material 6 of the above-mentioned three examples, as shown in FIG. 5, slits 12 are formed at equal intervals along the longitudinal direction over the entire length of the heat insulating material 2 formed of rock wool, and the heat insulating material 2 is formed. The slit 12 is formed so that it can be cut. The interval between the slits 12 is preferably about 50 mm. Insulation 2
If the heat insulating material 2 is formed to be cut in the vertical direction and the horizontal dimension of the heat insulating material 2 is larger than the dimension between the joists 5 and 5, one end of the fall prevention sheet 4 is peeled from the substrate 1 to remove the heat insulating material 2. The heat insulating material 2 conforming to the dimension between the joists 5 and 5 is formed by manually peeling off the fall prevention sheet 4 along the slit 12 from the substrate 1 and attaching one end of the peeled fall prevention sheet 4 to the substrate 1 again. In this way, the heat insulating material 2 can be manually peeled off and removed without using a cutter at the construction site, and the lateral dimension of the heat insulating material 2 can be narrowed to match the dimension between the joists 5 and 5. It is not necessary to cut the heat insulating material 2 using the cutter at the construction site, and the burden at the construction site can be reduced. Further, when the rock wool is cut by a cutter, fibrous fine particles are generated from the rock wool, and the fine particles make the hand feel uncomfortable, but the unpleasant feeling can be reduced.

Further, as shown in FIG. 6, in the above-described embodiment, the damping material 13 made of rubber or the like is provided over the entire length between the fixing piece 3 of the floor base material 6 and the upper surface of the joist 5. . The damping material 13 is formed of a general rubber-based material formed by molding NBR (acrylonitrile butadiene rubber), rubber chips, or the like, and the shape thereof is, for example, a hollow prismatic shape as shown in FIG. You may use what provided the V-shaped groove which opens in the lower surface as shown in FIG.7 (b).
Further, in order to improve the soundproofing performance of the floor base material 6, the substrate 1 may be formed of a board having a high specific gravity, or may be formed of a plywood sheet to which a sound insulating sheet is attached. As the heat insulating material 2, rock wool or glass wool can be used. The damping material 13 is attached over the entire length of the fixing piece 3 of the floor base material 6 in the vertical direction, and by applying the floor base material 6 on the joist 5, the fixing piece 3 and the upper surface of the joist 5 can be formed. Between the two.

Floor base material 6 thus provided with the damping material 13
Then, even if vibration is applied to the floor base material 6, the vibration damping material 13 can reduce the vibration, and in addition to the sound absorbing effect of the heat insulating material 2, the sound damping performance of the floor base material 6 is also improved by the vibration damping material 13. Is something that can be done. For this example,
The soundproofing performance was measured. (Examples 1 to 4) Floor base material 6 having the structure shown in Table 1
Was formed, and a surface layer material having a thickness of 12 mm was used as the uppermost layer. (Comparative Example) As shown in Table 1, a surface layer material having a thickness of 12 mm was used.

Regarding Examples 1 to 4 and Comparative Example,
Lightweight floor impact sound was measured based on JIS A 1418. The results are shown in Table 1.

[0030]

[Table 1]

It can be seen from Table 1 that all of the examples have higher soundproofing performance than the comparative examples. Further, FIG. 6 (b)
As shown in FIG. 5, short damping material 13 may be attached to the fixed piece 3 at regular intervals.
It is attached to the back surface of the fixing piece 3 with an interval of 0 mm. By arranging the damping material 13 at intervals as described above, even if the flooring material 6 is long in the longitudinal direction, the flooring material 6 can be easily cut at a portion where the damping material 13 is absent. The floor base material 6 can be easily adjusted in size. Further, as shown in FIG. 6C, the length of the damping material 13 and the interval at which the damping material 13 is attached may be asymmetric with respect to the central portion of the substrate 1. For example, the length indicated by A in the drawing is 15 mm, and the length indicated by B in the drawing is 20 mm. By doing so, the cutting position of the floor base material 6 can be set almost arbitrarily, and the degree of freedom in adjusting the dimension of the floor base material 6 that can be dealt with is increased.

[0032]

As described above, according to the present invention, the heat insulating material is attached to the back surface of the substrate, and both lateral ends of the substrate are projected outward from both lateral ends of the heat insulating material to form the fixing piece. Then, a fall prevention sheet that covers the back surface of the fixing piece and the side surface and back surface of the heat insulating material is attached to the substrate and the heat insulating material to form the floor base material, and the heat insulating material of the floor base material is fitted between the joists and the floor base material Since the fixing piece was fixed to the upper surface of the joist, by placing the floor base material with the heat insulating material mounted on the joist, it is possible to form a floor base material having heat insulation performance, and the joist can receive the heat insulating material. It is possible to eliminate the need to provide a member and to easily perform construction. Also, by covering and holding the back surface of the heat insulating material with a fall prevention sheet, it is possible to prevent the heat insulating material from falling off the board even if the heat insulating material peels from the board, and the heat insulating performance deteriorates due to long-term use after construction. There is no fear of doing it.

Further, according to the present invention, one end portion of the heat insulating material provided on the floor base material in the vertical direction is projected outward from the end portion of the substrate to form a protrusion, and the heat insulating material is arranged in the vertical direction. A recess is provided at the other end, another floor base material is arranged in the longitudinal direction of the floor base material, and the recess provided in the other floor base material is inserted into the protrusion provided on one floor base material. Therefore, even if the floor base materials are arranged in the vertical direction to form the floor base material, it is possible to prevent a gap between the floor base materials due to the protrusion of the heat insulating material, and it is possible to improve the heat insulation performance of the floor base material. In addition, the occurrence of dew condensation can be prevented.

Further, according to the present invention, the tongue piece is provided at one end of the floor base material in the vertical direction so as to project, and the groove is provided at the other end of the floor base material in the vertical direction to form the floor base material. Since other tongue pieces provided on one floor base material are inserted in the vertical direction and the groove provided on the other floor base material is inserted into the tongue piece on one floor base material, the floor base materials are arranged in the vertical direction. Even if the tongue is formed, it is possible to prevent the tongue from creating a gap between the floor base materials, improve the heat insulation performance of the floor base material, and prevent the occurrence of dew condensation. Is.

Further, since the heat insulating material is provided with a slit in the longitudinal direction and the heat insulating material is formed so as to be cut along the slit, even if the dimension between the joists is smaller than the width dimension of the heat insulating material, a cutter is used on site. It is not necessary to cut the heat insulating material by using the above, and the heat insulating material can be peeled off from the substrate by hand, and the burden of construction can be reduced. Furthermore, since a damping material is provided between the fixed piece of floor base material and the joist, even if vibration is applied to the floor base material, vibration can be reduced by the vibration control material,
In addition to the sound absorption effect of the heat insulating material, the sound insulation performance of the floor base material can be improved by the vibration damping material.

In addition, since rock wool is used as the heat insulating material, the floor base material can be formed at a lower cost than using a heat insulating material such as glass wool or expanded styrene.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the above-mentioned floor base material.

FIG. 3 is a sectional view of another embodiment of the above.

FIG. 4 (a) is a cross-sectional view of another embodiment of the above, and FIG. 4 (b) is a perspective view of a part of a floor base material.

FIG. 5 is a sectional view of another embodiment of the above.

6A is a sectional view of another embodiment, FIG. 6B is a side view of another embodiment, and FIG. 6C is a side view of another embodiment.

7 (a) and (b) of the same vibration damping material are perspective views. FIG.

8A and 8B are cross-sectional views of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Heat insulating material 3 Fixing piece 4 Fall prevention sheet 5 Joist 6 Floor base material 7 Edge part 8 Projection part 9 Recessed part 10 Tongue piece 11 Recessed groove 12 Slit 13 Damping material

Claims (6)

[Claims] 1. A heat insulating material is attached to a back surface of a substrate, and both lateral ends of the substrate are projected outward from both lateral ends of the heat insulating material to form a fixing piece. Attach a fall prevention sheet that covers the side and back of the material to the substrate and heat insulating material to form a floor underlaying material, fit the heat insulating material of the floor underlaying material between the joists and fix the fixing piece of the floor underlaying material to the upper surface of the joist A structure for attaching a floor base material, which is characterized in that 2. The heat insulating material provided on the floor base material has one end in the vertical direction projecting outward from the end of the substrate to form a protrusion, and the other end in the vertical direction of the heat insulating material. Recessed in
2. A floor base material is provided with another floor base material in the longitudinal direction, and a projection provided on one floor base material is fitted with a recess provided on the other floor base material. Installation structure of the floor base material described in. 3. A floor base material is provided with a tongue projecting at one end in the vertical direction, and a groove is provided at the other end in the vertical direction of the floor base material, and another groove is provided in the vertical direction of the floor base material. 2. The floor base material according to claim 1, wherein the floor base material is provided and the tongue piece provided on one floor base material is inserted into the groove provided on the other floor base material. Mounting structure. 4. The installation of a floor base material according to claim 1, wherein the heat insulating material is provided with vertical slits, and the heat insulating material is formed so as to be cut along the slits. Construction. 5. The mounting structure for a floor base material according to claim 1, wherein a damping material is provided between the fixing piece of the floor base material and the joist. 6. The floor substratum mounting structure according to claim 1, wherein rock wool is used as the heat insulating material.