JP3395412B2 - Soundproof flooring - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-insulating floor material for direct attachment which is directly laid on a floor base such as a concrete slab.

[0002]

2. Description of the Related Art In recent years, a direct-adhesive wooden flooring material having a soundproofing property has been used for a middle- and high-rise housing, in which a wooden flooring material is directly laid on a concrete slab or the like. The wooden floor material for direct application has a cushioning material such as a non-woven fabric attached to the back surface of the wooden base material so as to have sound insulation properties against floor impact sound and conform to the uneven surface of the floor base.

Recently, for applications requiring particularly high soundproofing performance, as shown in FIG. 2, a decorative material is used as the uppermost layer, plywood as a base material is used as the intermediate layer, and a cushioning material is used as the lowermost layer. As a result, floor materials have been used which are successively laminated and integrated, and in which plywood of the intermediate layer is provided with cut grooves orthogonal to the longitudinal direction of the floor materials. And in the case of this type of flooring material, the plywood retains the bending strength in the longitudinal direction of the flooring material, and from the viewpoint of cost, the fiber directions of the veneer of the uppermost layer and the lowermost layer constituting the plywood are usually the same as those of the flooring material. It is parallel to the longitudinal direction.

The cut groove is usually cut from the back side of the plywood toward the surface, and the depth of the cut groove is appropriately determined in relation to the rigidity of the floor material and the target sound insulation performance.
The role of the cut groove is to lower the natural frequency of the floor material by lowering the rigidity of the base material, thereby preventing resonance with vibration input by impact, improving sound insulation performance, and at the same time The main purpose is to adapt it to the uneven surface of the ground.

In order to improve the sound insulation performance, it is necessary to engrave the kerf as deep as possible. However, if it is engraved too deeply, the bending resistance in the kerf will be small, and the rigidity required for the floor material will not be maintained, so the floor will sink too much during walking, and the feeling of walking will deteriorate,
When a large pressing force is locally applied by the legs of furniture such as a chair or a desk, bending stress is applied to the floor material, and defects such as bending from the kerf portion occur. There is also a problem that an unpleasant squeak noise and a squeal noise are generated when the floor material is bent, so that the depth of the kerf is naturally limited.

When plywood is used as the base material, the method disclosed in JP-A-1-1
As disclosed in No. 42170, when the fiber direction of the veneer at the bottom of the kerf is parallel to the kerf direction, the kerf opens when a pressing force is applied from above, and the veneer at the bottom of the kerf is opened. Is destroyed and produces a squeaking noise and a squeaking noise. Therefore, it is desirable that the fiber direction of the veneer at the bottom of the kerf be orthogonal to the kerf direction.

However, the plywood used as the floor substrate is
As described above, from the viewpoint of the material cost of the plywood and because it is necessary to maintain the bending strength in the longitudinal direction, the fiber directions of the uppermost veneer (face) and the lowermost veneer (back) are shown in FIG. As mentioned above, plywood that matches the longitudinal direction of the floor material is used. Since the veneer of the uppermost layer of plywood has a decorative material on it, it is necessary to have no defects such as cracks.Since such veneer is more expensive than other veneers, the cost is low. It cannot be used if it is too thick. Also, it cannot be made too thick in terms of the thickness balance with the cross band (core plate). For example, in the case of a 5-layer plywood having a thickness of 9 mm, even if the cost is ignored, the limit is about 1.5 mm. Considering the cost of the plywood, it is the current situation that 1.2 mm or more cannot be used. Also, as a matter of course, the cosmetic material for the surface layer is more expensive, so that it cannot be set too thick for economical reasons.

As mentioned above, since the thickness of the face material of the surface layer and the face of the plywood cannot be made too thick, if the kerf is carved until reaching the face, the bending resistance of the kerf becomes extremely small. , It becomes impossible to maintain the rigidity required for floor materials. Therefore, when using a normal plywood in which the fiber direction of the veneer of the uppermost layer and the lowermost layer is parallel to the longitudinal direction, the bottom of the kerf is the plywood second layer or unless a thick material is used as a decorative material. There is no choice but to stop at the third layer.

However, as described above, the kerf is formed in the second plywood plate.
When placed in a layer, it runs perpendicular to the direction of the kerf and the fiber direction of the veneer, and when pressure is applied from the top, the kerf opens and the veneer at the bottom of the kerf is destroyed, resulting in squeaking and squeaking noises. Occurs. When the kerfs are placed on the third layer of plywood, the depth of the groves is shallow, and the rigidity of the plywood does not decrease so much, so that the sound insulation performance is not good as compared with the one in which the kerfs are deeply carved. Therefore, if ordinary plywood is used, it is difficult to solve the problems of squeaking noise and squeaking noise while maintaining the sound insulation performance.

Japanese Unexamined Patent Publication No. 142170/1989 discloses a surface material,
In a soundproofing floor material in which an elastic sheet and plywood are sequentially laminated and integrated from the top, as shown in FIG. 3, the fiber direction of the top ply (face) and the bottom ply (back) of the plywood is that of the flooring. Also disclosed is an example in which a plywood orthogonal to the longitudinal direction (so-called reverse dimensioned plywood) is used, the bottom of the kerf is placed on the second or fourth plywood veneer, and the fiber direction of the veneer is orthogonal to the kerf. Has been done. This is also one of the solutions to the above problems,
Not only is reverse plywood 40% to 50% more expensive than normal plywood, but as described below, while maintaining sound insulation performance, it is not possible to adequately solve the problem of unpleasant noise such as squeaking noise. Not a practical solution.

[0011]

SUMMARY OF THE INVENTION The present invention solves the problem of generation of unpleasant noise such as squeaking noise while maintaining the sound insulation performance by the means described below. That is, as shown in FIG. 1, a decorative material such as a wood veneer veneer is bonded to the uppermost layer, MDF (medium fiberboard) is bonded to the second layer, plywood is bonded to the third layer, and cushioning material is bonded to the lowermost layer. The MDF of the second layer and the plywood of the third layer have cutting grooves orthogonal to the longitudinal direction of the floor material from the back surface of the plywood.
It has been applied to a depth of up to. That is, the difference from the conventional soundproof flooring material is that a layer of MDF is interposed between the plywood and the decorative material, and the position of the bottom of the kerf is set to the MDF.

As disclosed in JP-A-1-142170, the cause of the squeak noise is caused by a crack generated at the bottom of the kerf, and if the occurrence of this crack can be prevented, the squeak noise can be prevented. Because it can be considered. And
The present invention solves this problem by disposing a flexible MDF at the bottom of the groove where cracks are most likely to occur.

By the way, the depth of the groove is appropriately determined mainly in consideration of the sound insulation performance of the floor material, the rigidity required for the floor material, the conformability to the uneven surface of the floor base, and the like. As for the rigidity of the floor material, the groove spacing becomes a problem when viewed from the entire floor surface, but the problem such as squeaking noise is the problem of the local groove depth. In order to improve the sound insulation performance, it is preferable to make the groove depth as deep as possible to reduce the rigidity of the floor material, but if it is too deep, the rigidity required for the floor material will be lost and the walking feeling due to excessive subsidence will be lost. It is necessary to engrave as deeply as possible within a range that does not cause excessive subduction or squeak noise, because unpleasant sound such as aggravation or squeak noise becomes a problem.

However, the wood-based high performance soundproof flooring materials for high-rise houses that are most often used nowadays have a decorative material on the plywood surface, a cushioning material on the back surface of the plywood, and a plywood surface from the back to the front. It has a structure in which a kerf is carved facing. And the surface decorative material and the face of the plywood first layer,
Since it is much more expensive than the wood part of the plywood second layer and below, the thickness thereof is usually around 0.2 mm to 1 mm for the surface decorative material and around 1 mm for the face of the plywood first layer. . Further, since the fiber direction of the veneer of the face is generally parallel to the longitudinal direction of the flooring material, if the groove is cut into the face of the first layer of the plywood, the flooring material cannot be provided with the necessary rigidity. Therefore, the bottom of the cut groove must be stopped by the core plate (cross band) of the second plywood layer.
However, if the thickness of the decorative material is thick enough to contribute to the rigidity of the flooring material, the groove may be cut into the face of the plywood first layer, but as in Comparative Example 2 or 3 described below, the bottom of the groove is Since it is a wood veneer, it is poor in flexibility and easily cracks and spreads along the fiber direction, which causes a squeaking noise.

When ordinary plywood is used, the veneer second layer veneer is a cross band, and its fiber direction is parallel to the direction of the kerf. Therefore, when bending stress is applied to the floor material during walking,
The kerf opens and cracks easily form from the bottom of the kerf toward the inside of the veneer, which causes a squeaking noise. If the bottom of the kerf is cut until the fiber direction reaches the plywood third layer veneer whose fiber direction is parallel to the longitudinal direction, cracks are less likely to occur because the direction of the kerf and the fiber direction of the veneer are orthogonal to each other The sound can be reduced, but instead the kerf is shallow,
As mentioned above, the sound insulation performance is inferior because the rigidity of the floor material cannot be lowered so much.

To solve this problem, a reverse sizing plate is used,
If cutting is performed until the bottom of the kerf reaches the veneer of the second layer of plywood, the direction of the kerf and the fiber direction of the veneer are parallel to each other, so that cracks are less likely to occur. However, as shown in a comparative example with the present invention to be described later, when the notch in the second layer of plywood is shallow, cracks are less likely to occur and the squeal noise can be reduced, but a single cut on the bottom of the kerf is possible. Since the fiber direction of the board is parallel to the longitudinal direction of the flooring material, the rigidity of the flooring material cannot be sufficiently reduced,
Sound insulation performance is not good.

Although the sound insulation performance can be improved by engraving the cut groove deeply, the same stress as in the above case is applied to the place where the rigidity of the floor material in the groove portion is lowered. Therefore, the amount of bending deformation of the groove becomes large and cracks easily occur,
The squealing noise increases.

In short, in the conventional technique in which the bottom of the kerf is placed in the plywood portion, it is not possible to keep the sound insulation performance and at the same time sufficiently reduce the squeal noise.

In the soundproof floor material having the cut grooves as described above, when a pressing force is applied to the upper portion of the floor material, the floor material undergoes bending deformation to open the cut groove and the bending stress concentrates at the bottom of the cut groove. . However, in the floor material of the prior art, the bottom of the kerf is a plywood with poor flexibility, and if cracks occur, the cracks tend to spread along the fiber direction. On the other hand, in the case of the present invention, since the bottom of the kerf is a flexible MDF, it is possible to absorb bending stress and prevent the generation or expansion of cracks, so that it is possible to prevent the generation of squeal noise. Of.

In the present invention, the decorative material is used as the first layer, the second layer is provided with MDF, and the third layer and the fourth layer are respectively provided with plywood and a cushioning material, which are laminated and integrated with an adhesive. Then, a kerf is made from the back surface of the plywood toward the MDF to a depth that can exhibit a predetermined sound insulation performance. At this time, the bottom of the kerf is M
The thickness of the MDF must be set in advance so that it can be placed in the DF. The required thickness of the MDF and the depth of the kerf depend on the target sound insulation performance, and also on floor material components such as groove spacing, cushioning material thickness, cushioning material cushioning performance, and decorative material thickness.

That is, if the floor constituent elements such as the target sound insulation performance and the thickness of the decorative material are changed, the required M
Although the thickness of the DF and the depth of the kerf change, by referring to the empirical values, floor components such as the groove spacing, the type of cushioning material, the type of decorative material, etc. are appropriately selected, and the sound insulation performance test is repeated, The kerf depth can be easily set according to the target value of sound insulation performance and the floor material composition. This method is no different from the conventional soundproof flooring. In the present invention, the cross-sectional shape of the bottom of the kerf is preferably U-shaped as shown in FIG. This is because when the floor material undergoes bending deformation, bending stress concentrates on the bottom of the kerf, especially at the corners of the kerf, and cracks easily form at the corners. By changing the corner of the bottom of the kerf to a curved surface, the bending stress applied to the bottom can be dispersed and the occurrence of cracks can be reduced.

The kerf must be carved from the back surface of the plywood until the bottom of the kerf reaches the MDF. When the cross-sectional shape of the kerf is square, stress concentrates near the corners and cracks easily form there, so if the corners are not completely cut into the inside of the MDF, the expected result of the present invention is obtained. I cannot achieve my purpose. When the cross-sectional shape of the kerf is U-shaped, it is not always necessary that the curved surface portion of the U-shape is completely cut into the inside of the MDF, but the curved surface portion of the U-shape is inside the MDF. Since the higher the embedded ratio, the greater the effect, it is the most desirable form that the U-shaped curved portion is completely cut into the inside of the MDF.

In consideration of the above reason and the machining accuracy of the kerf, the MDF to be used needs to have a thickness of at least 1 mm or more regardless of the thickness of the decorative material to be stuck thereon.
However, when the MDF upper layer decorative material is thin and contributes little to the rigidity of the floor material, the MDF must maintain the rigidity necessary for the floor material.
It goes without saying that the DF must be thickened.

In the case of the present invention, a part of the plywood portion of the flooring material of the prior art is replaced with MDF to prevent the generation of unpleasant noise such as squealing noise. For that reason, the thickness of the MDF needs to be 1 mm or more. However, since MDF has smaller rigidity and weaker strength than plywood, if the ratio of MDF is too large, the rigidity of the entire flooring material decreases and the actual strength of the joint portion becomes weaker. In addition, even after the floor material is constructed, MDF is less likely to have lower rigidity and strength due to moisture absorption from the back surface of the floor material than plywood. Performance decreases. Therefore, the upper limit thickness of the MDF is one-half or less of the plywood, that is, if a part of the plywood having a thickness of 18 mm is used for replacement, the MDF replaces one-third or less thereof, that is, the MDF. 6
mm or less and plywood thickness 12 mm or more, total thickness 18 m
It is desirable to set m.

By the way, the floor height of the middle- and high-rise houses cannot be set very large due to legal regulations and economic reasons. Further, since the cost of the floor material itself is usually higher as the thickness increases, it is naturally desired that the floor material be as thin as possible and have high sound insulation performance. In the case of ordinary middle and high-rise houses, even in the case of soundproof flooring materials that require sound insulation performance, most of them have a total thickness of 10 mm to 20 mm, and those having a thickness greater than that are rarely used for the above reason. The cushioning material used for this makes the feeling of walking worse when the depression during walking is too large. Therefore, if the thickness of the upper layer portion (plywood and decorative material) of the cushioning material is thin, the rigidity is low and the sinking is large, so that a thin cushioning material is used according to the thinness of the cushioning material. Those having a thickness of 2 mm to 8 mm are usually used depending on the thickness of the part. If it is thicker than this, the feeling of walking becomes worse, and if it is thinner, the cushioning effect is less.

Since the base material is usually a sounding body such as plywood, the thicker it is, the louder the sound generated by the impact becomes, and the more difficult the sound insulation becomes. Further, since the base material has a role of retaining the rigidity of the floor material and imparting the necessary strength to the joint portion, the plywood needs to have a thickness of 6 mm or more. So usually,
Plywood of 6 mm to 15 mm is used, and one that is thicker than necessary is not used. Further, in terms of rigidity and cost of the entire flooring material, a thickness of 6 mm to 12 mm is the most preferable range. In the case of the present invention, one third of the substrate plywood
Since the following is replaced with MDF, the thickness of MDF and plywood is 1 mm to 5 mm and 5 mm to 14 m, respectively.
m and the thickness of the MDF is not more than half the thickness of plywood. The most preferable thickness ranges are 1 mm to 4 mm and 5 respectively.
mm to 11 mm, and the thickness of the MDF is not more than half the thickness of plywood.

As described above, the thickness of the decorative material is 0.2 mm to 1 mm in most cases except for very special cases. Since the decorative material is also a sounding body in general, the above thickness range is the most preferable range from the viewpoint of sound insulation and cost similarly to plywood. However, in the case of floors for shoes, 1 mm to 3 mm for decorative materials and 12 mm to 18 mm for plywood in consideration of durability.
A thicker one of mm may be used. Even when such thick decorative materials and plywood were used, pressing force was applied from the upper part of the flooring if the plywood was provided with a sound-insulating cut groove and the bottom layer had a sound-insulating cushioning material. At times, the cushioning material shrinks in the thickness direction, and the floor material is always bent and deformed, and a squealing noise or the like is emitted. Therefore, even in such a case, the technical means of the present invention can naturally be applied, and a certain effect can be obtained.
In this case, the thickness of MDF and plywood is 1 mm to 6 respectively.
mm and 11 mm to 17 mm, and the thickness of MDF is 1/2 or less of plywood.

The ranges of the present invention to which the present invention can be applied and preferable ranges of the thicknesses of the decorative material, MDF, plywood and cushioning material have been described above. The present invention is a soundproof floor material in which these are laminated and integrated. The form that exhibits a high level of sound insulation effect against floor impact sound at the cheapest cost is wood decorative material thickness 0.2 mm to 1 mm, MDF thickness 1 mm to 4 mm,
Plywood thickness 5 mm to 11 mm, cushioning material thickness 2 mm to 8 mm
In addition, the thickness of the MDF is a combination of ½ or less of the plywood thickness.

As the decorative material used in the present invention, a wooden decorative veneer, a sheet-shaped decorative material such as a synthetic resin film having a printed pattern, or a wooden decorative veneer on a wooden base material such as thin plywood. Any decorative material that is generally used on the surface of a floor material, such as a pasted material, can be used.

The cushioning material attached to the lowermost layer is also a non-woven fabric, a foam synthetic resin sheet, an elastic rubber sheet, or a combination thereof, or those having a hollow portion or a corrugated cross section. Any material commonly used as a cushioning material for flooring can be used.

[0031]

[Effects of the Invention] When a large pressing force is applied from the upper part of the floor material by a person's walking or the legs of furniture such as chairs, the floor material is bent and deformed by bending stress, so that the kerf is opened. Stress concentrates on the bottom. In particular, when the bottom cross-sectional shape of the kerf is a square shape like the floor material of the prior art, stress is likely to concentrate on the corner. Moreover, in the case of the floor material according to the prior art, the material of the bottom of the kerf is a wood veneer, which is poor in flexibility and easily cracks along the fiber direction. Moreover, once a crack is formed, the crack is likely to spread from that location. In particular, since bending stress concentrates at the corners of the bottom of the kerf, cracks are likely to occur, and the cracks cause an unpleasant squealing noise or squeaking noise. The present invention is a MD in which the bottom of the kerf has flexibility and has little directionality.
Since it is F, it is difficult for a crack to be formed, and even if a crack is formed, it is difficult to spread, so that a squeaking noise is hardly generated.

Further, if the cross-sectional shape of the bottom of the kerf is U-shaped, the concentrated stress due to bending deformation is not concentrated on the corners, so that the effect of preventing the occurrence of cracks can be further improved. It is possible to improve the effect of preventing the generation of the squealing noise.

[0033]

EXAMPLES The results of light weight floor impact sound level measurement test based on JAS A1418 and squealing sound test of the soundproof flooring material having the following constitution, which is an embodiment of the present invention, are shown together with comparative examples.

[Examples] Floorboard size (excluding cushioning material) Thickness 9.4 mm x Width 70 mm x Length 909 mm If the tree type and thickness of decorative veneer is 0.26 mm, MDF specific gravity and thickness specific gravity: 0.61, thickness: 2.7 mm plywood (usually Lauan plywood) 0.8mm, 1.9mm, 1.0mm, 1.9mm, 0.8mm from the upper layer, normal plywood with a total thickness of 6.4mm Groove spacing 10mm Groove depth, width Depth: 6.5mm from back of plywood, width : 1.5 mm buffer material thickness is 5 mm, the sample in apparent density 0.035 g / cm ³ nonwoven stepping sounds sound composed of polyester fibers of the test, from the flooring structure to measure the stepping sound sounds generated from the substrate The cushioning material removed should be used, placed on a fulcrum with a span of 3 cm so that the kerf is located in the center, and 1 kg / cm ^{2 in the} center of the upper part.
Was applied to cause the floor material to bend and deform, the sudden sound generated by the microphone was captured, and 1/3 octave analysis was performed on the audible region of the data.

[Comparative Example] Plywood of flooring material and M in Example
Replacing DF with the following plywood, using the same experimental method as in the example,
A lightweight floor impact sound level measurement test and a squealing noise test were conducted. However, in Comparative Example 3, the kerf depth was 7.5 mm from the back surface of the plywood in order to adjust the sound insulation performance to the same level as the Examples and other Comparative Examples.

Veneer structure of plywood (thickness: mm) and groove depth (mm) Comparative Example 1 Comparative Example 2 Comparative Example 3 (normal plywood) (reverse size plywood) (reverse size plywood) 1st layer 1.1 1.0 1.0 2nd layer 2.7 3.0 3.0 3rd layer 1.5 1.1 1.1 4th layer 2.7 3.0 3.0 5th layer 1.1 1.0 1.0 Total thickness 9.1 9.1 9.1 Groove depth 6.5 6.5 7.5 FIGS. Is a graph obtained by frequency-analyzing the measurement data of.
The frequencies are AP, 100,125,160,200,250,3 from the left.
15,400,500,630,800,1K, 1.25K, 1.6K, 2K, 2.5K, 3.15K, 4K,
It is 5K, 6.3K, 8K, 10K, 12.5K, 16K, 20K (HZ), A.

AP is the sum of the sound pressures of all frequencies, and A is the sum of the sound pressures when the auditory sense is corrected with the A characteristics in order to match the human sensory characteristics.

Comparing the example with the comparative example 1, it can be seen that the example has a much smaller squeal noise. In Comparative Example 2 using the reverse dimension plywood, the squealing noise is considerably improved as compared with Comparative Example 1, but not only does it fall short of the example, but the kerf reaches up to the third layer of the plywood, Since the flooring material has a high rigidity, as is clear from Table 1, the sound insulation performance is remarkably reduced as compared with the examples.

In Comparative Example 3, a flooring material having the same structure as that of Comparative Example 2 was deeply cut with a kerf so that the sound insulation level was substantially equal to that of the Example. As you can see from the graph,
If the sound insulation performance is made the same level by using the reverse plywood, the squealing noise will become louder this time. In other words, it is difficult to sufficiently reduce the squealing noise while maintaining the sound insulation performance even if the reverse plywood is used.

[0040]

[Table 1]

[Brief description of drawings]

FIG. 1 is a sectional view of a soundproof flooring according to the present invention.

FIG. 2 is a cross-sectional view of a conventional soundproof flooring material.

FIG. 3 is a cross-sectional view of a conventional soundproof flooring material.

FIG. 4 is a sectional view of a soundproof flooring according to the present invention.

FIG. 5 is a 1/3 octave analysis graph of the example.

FIG. 6 is a 1/3 octave analysis graph of Comparative Example 1.

7 is a 1/3 octave analysis graph of Comparative Example 2. FIG.

FIG. 8 is a 1/3 octave analysis graph of Comparative Example 3.

[Explanation of symbols]

a Cosmetic material b plywood c cushioning material d kerf m MDF

Claims (4)

(57) [Claims] 1. A decorative material having a thickness of 0.2 mm to 1 mm for the first layer, a MDF having a thickness of 1 mm to 5 mm for the second layer, a plywood having a thickness of at least twice the MDF and 5 mm to 14 mm for the third layer, and a fourth layer. A flooring material in which a cushioning material having a thickness of 2 mm to 8 mm is sequentially laminated and integrated in layers, and is cut at a proper interval from the back surface of the plywood, orthogonal to the longitudinal direction of the flooring material, and having a square or U-shaped cross section at the bottom. A soundproof floor material for direct attachment, which is characterized in that the groove is cut until it reaches the MDF. 2. A decorative material having a thickness of 0.2 mm to 1 mm for the first layer, an MDF having a thickness of 1 mm to 4 mm for the second layer, and a plywood having a thickness of at least twice the MDF and 5 mm to 11 mm for the third layer. A flooring material in which a cushioning material having a thickness of 2 mm to 8 mm is sequentially laminated and integrated into four layers, and is orthogonal to the longitudinal direction of the flooring material at appropriate intervals from the back surface of the plywood, and the cross-sectional shape of the bottom is square or U-shaped. A soundproof floor material for direct attachment, which is characterized in that the kerf is cut until it reaches the MDF. 3. A decorative material having a thickness of 1 mm to 3 mm as a first layer,
The second layer has an MDF with a thickness of 1 mm to 6 mm, the third layer has a thickness of at least twice the MDF and a plywood of 1 mm to 17 mm, and a fourth layer.
A flooring material in which a cushioning material having a thickness of 2 mm to 8 mm is sequentially laminated and integrated in layers, and is cut at a proper interval from the back surface of the plywood, orthogonal to the longitudinal direction of the flooring material, and having a square or U-shaped cross section at the bottom. A soundproof floor material for direct attachment, which is characterized in that the groove is cut until it reaches the MDF. 4. The soundproof flooring material for direct application according to claim 1, wherein the first layer is a veneer made of wood.