JP5094206B2 - Architectural base sheet - Google Patents

Description

  The present invention relates to a building foundation sheet used as a roof underlaying material or a wall surface foundation material.

  A typical example of this type of building foundation sheet is roofing used for tiled roofs. FIG. 4 shows a conventional general tiled roof. In this type of tiled roof, a roof roofing material (roofing) X is laid on a roof base plate 5 and a tile positioning tile is placed thereon. .. Are installed by nailing and the roof tiles 6, 6... Are nailed to the roof tiles 7, 7.

  The roofing X used for the tiled roof has a waterproof function. For example, when the rainwater is blown from the gap between the tiles 7 and 7 or the tile 7 is broken, the roofing X enters the lower surface side of the tile 7. There is a function to prevent the water W from leaking to the base plate 5 side.

  By the way, as the conventional general roofing X, as shown in FIG. 4, the thing of the plane sheet shape without an unevenness | corrugation is employ | adopted. On the other hand, in the tiled roof, the tile rail 6 is mounted on the roofing X by nailing, and the tile rail 6 is mounted in the roof width direction at a predetermined interval in the inclination direction of the roof. Therefore, in the case of using the flat sheet-like roofing X, the entire lower surface of the roof tile 6 is in contact with the upper surface of the roofing with almost no gap, and when rainwater W enters the lower surface side of the roof tile 7, The rainwater W is blocked by the tile pier 6 on the roofing X and stays there for a long time.

As described above, when the rainwater W stays at the roof rail 6 portion on the roofing X for a long time, the following problem occurs.
(1) Since the roof tiles 6 remain wet for a long time with the intruding rainwater W, the tile rails 6 decay quickly.
(2) Invasion rainwater W gradually infiltrates between the bottom surface of the roof tile 6 and the top surface of the roofing X, and enters the field plate 5 from the nail hole formed in the roofing X, causing rain leakage and The base plate 5 gets wet and decays.
(3) The intrusion rain water W easily comes into contact with the nail for fixing the tile rail 6 for a long time, and the nail is rusted (the decay of the nail proceeds), thereby impairing the strength or durability of the roof.

  On the other hand, this type of roofing X is designed to prevent moisture from penetrating rainwater W that has entered the lower surface of the roof tile 7 into the base plate 5 side. By the way, the attic of the tiled roof has a small ventilation opening, but the air permeability is poor. Is not released and remains in a high humidity state for a long time. And, if the attic is in a high humidity state, moisture may condense on the attic when the temperature drops at night. Sometimes, the condensed water may cause stains on the ceiling board, or the field board 5 may Absorbs condensed water and becomes highly moist. In addition, when the field plate 5 remains in a high water content state for a long time, there are problems that mold is generated there and the field plate 5 is easily rotted.

  In addition to roofing for tiled roofs, this type of architectural foundation sheet is also used as a foundation material for building walls. As described above, the problem of condensation on the back side of the wall base material occurs.

  In order to improve the problems of the flat sheet-like architectural base sheet (roofing) X described above, the present applicant has proposed the architectural base sheet Y shown in FIGS. The base sheet (roofing) Y shown in FIGS. 5 to 7 is disclosed in Japanese Patent Laid-Open No. 2003-27677 (Patent Document 1).

  The known roofing Y shown in FIG. 5 to FIG. 7 is formed with a plurality of small convex portions 2, 2... Extruded on one side with a small interval in the front, rear, left and right directions on a waterproof sheet base material 1. A small diameter vent hole 3 is formed in the vicinity of the center of each small convex portion 2, 2,.

  Each small convex part 2 has a diameter of about 5 to 10 mm and a height of about 3 to 5 mm, and the distance (center distance) between the small convex parts 2, 2. It is formed to become. Therefore, parts other than the small convex part 2 in the sheet | seat base material 1 are continuing in the planar state (continuous plane part 4). The sheet base material 1 used as the roofing is impregnated with asphalt but is relatively thin (for example, a thickness of about 0.5 to 1 mm), and a part of the sheet base material 1 is extruded. The small protrusions 2 themselves do not have a very high pressure resistance.

  The vent hole 3 of each small convex portion 2 is formed to have a minute diameter of about 0.5 to 1 mm, and allows passage of water as much as possible while allowing passage of air.

  As shown in FIGS. 5 to 7, the roofing Y is laid on the roof base plate 5 so that the small convex portions 2 are on the upper surface side, and tile roofs 6, 6.・ Attach the roof tiles 7 and 7 to the roof tiles 6 and 6 to complete the roof construction.

  Thus, in the tiled roof using the roofing Y with the small convex portion 2, there is a gap corresponding to the height of the small convex portion 2 between the lower surface of the tile rail 6 and the upper surface of the continuous flat portion 4 of the sheet base material 1. Therefore, even if rainwater W enters through the gap between the roof tiles 7, 7,..., The intruding rainwater W flows down the continuous flat portion 4 on the upper surface of the sheet substrate 1 (reference numeral W in FIG. 5). ).

Further, since the small convex portions 2, 2,... Are formed with ventilation holes 3, even if the attic is in a high humidity state during rainy weather, the moisture in the attic will become clear when the weather becomes clear (the outside air becomes low humidity). There passes through the sheathing roof board 5 (the letter S ₂ designates in Figure 7), further roofing top side through the respective vent holes 3, 3 ... will be released to the (outside air) (letter S ₁ designates in FIG. 7) The attic humidity will drop to the outside air humidity in a short time.

  As described above, the known (Patent Document 1) base sheet (roofing Y) shown in FIGS. 5 to 7 has both a waterproof function against intrusion rainwater W and a humidity release function on the lower surface side of the sheet base material. ing.

Japanese Patent Laid-Open No. 2003-27677

  By the way, in the tiled roof using the base sheet (roofing Y) shown in FIGS. 5 to 7 (Patent Document 1), the sheet base 1 is continuously formed by the small convex portions 2 formed on the sheet base 1. Since a gap can be formed between the flat surface portion 4 and the roof tile 6, the intruding rain water W flows down on the continuous flat surface portion 4 without being blocked by the roof tile 6, while the small convex portions 2, 2. The roofing Y has the function of allowing the moisture in the attic to be released upward through the vents 3, 3...

  That is, each small convex portion 2, 2... Is simply extrusion molded, so when the roof tile 6 is placed on the small convex portion 2, 2,. The small convex portions 2, 2... That contact the roof bar 6 may be strongly pressed and deformed (collapsed), and the small convex portions 2, with the load of the tiles 7, 7,. There was also a possibility that 2 ... could be crushed gradually and the roof rail 6 would be loose.

  Further, although the vent holes 3 of the small convex portions 2, 2... Have a very small diameter, a part of the rainwater W that has entered the lower side of the roof tile 7 is indicated by reference numeral Wa in FIG. 3. There is a risk of entering the internal space of the small convex portion 2 through the..., And in this case, the field board 5 is wetted by the intrusion rain water Wa. In particular, when the roofing Y before the roofing 7 is exposed on the base plate 5 during the roof construction, if there is a large amount of rainfall, the top surface of the roofing Y will become wet and the small protrusions 2 , 2... Rainwater is also placed on the grooves (especially rainwater is concentrated in the valleys and the small convex portions 2 may be submerged), and the rainwater passes through the vents 3 and is slightly convex. The risk of entering the internal space of the portion 2 is increased.

  Therefore, the present invention has been made to improve the above problems in the base sheet (roofing) of FIGS. 5 to 7 (Patent Document 1), and prevents deformation (collapse) of each small convex portion. Another object of the present invention is to provide a building foundation sheet that can secure a further waterproof function against rainwater entering from a vent hole.

  The present invention has the following configuration as means for solving the above problems. The present invention is directed to a building foundation sheet that can be used as a roofing material (roofing) or as a wall foundation material.

  The architectural base sheet of the present application forms a large number of small convex portions extruded on one side with small intervals in the front, rear, left, and right directions on a waterproof sheet base material, and a minute amount near the center of each small convex portion. The basic structure is that air holes are formed, but in addition to this, each internal space of each small convex part is filled with a water-absorbing polymer, and a thin sheet with air permeability is further formed on the lower surface of the sheet base material. The water-absorbing polymer is attached and sealed in each internal space.

  As the sheet base material, one obtained by attaching (impregnating or applying) asphalt to paper, nonwoven fabric, or the like, or two sheets of paper, nonwoven fabric, or the like covering the front and back surfaces of the asphalt layer can be used. In recent years, plastic-based and rubber-based (each having waterproof properties) roofing materials have been developed as sheet base materials. In this application, roofing materials of such materials (plastic-based or rubber-based) are also used. Can be used.

  Each small convex portion of the sheet base material has a diameter of about 5 to 10 mm and a height of about 3 to 5 mm, for example, and the interval (center interval) between the small convex portions is about 10 to 20 mm in the front, rear, left and right respectively. It is formed as follows. These numerical values are not particularly limited, and can be appropriately changed in design. Each small convex portion can be designed in an appropriate shape such as a circle or a quadrangle in a plan view, and can be designed in an appropriate shape such as a trapezoid or a hemisphere in a side view.

  The portions other than the small convex portions in the sheet base material are continuous in a flat state, and the continuous flat portion becomes a flowing-in passage of intrusion rainwater.

  The air holes of each small convex portion may be fine holes having a diameter of about 0.5 to 1 mm, for example, or may be fine mesh shapes. Further, when the vent hole is a minute hole, it may be one or plural. If the vent hole is made minute in this way, the intrusion of rainwater can be prevented to some extent, but there is still a possibility that a part of the rainwater enters the inner space of the small convex portion through the vent hole.

  It is preferable that the water-absorbing polymer filled in the internal space of each small convex portion is filled in each internal space in a full state. This water-absorbing polymer is an aggregate of small particles (for example, a diameter of about 0.5 to 2 mm) so that air can flow through the gaps between the small particles. In addition, as a kind of this water absorption polymer, general purpose things, such as an acrylate type, can be used, for example.

  The thin sheet affixed to the lower surface of the sheet substrate has air permeability, and for example, a nonwoven fabric can be adopted. And the said water absorption polymer is enclosed in the internal space of each small convex part by sticking a thin sheet on the lower surface of a sheet base material.

  When used as roofing for a tiled roof, the building foundation sheet is laid on a roof base plate with the small convex portion on the upper surface side. Then, tile rails are attached on the base sheet (nailing to the base plate), and tiles are hung on each tile rail (nailing) to complete the roof construction.

  By the way, in a state where the base sheet is laid on the base plate, the thin sheet on the lower surface of the sheet base material is joined to the upper surface of the base plate, so that the water-absorbing polymer filled in the internal space of each small convex portion is thin. It is sealed with a base plate through the sheet, and even if a large pressing force is applied to the upper surface of the small convex portion, the water absorbing polymer is not pushed downward from the internal space. Therefore, the water absorbing polymer has a function of reinforcing the small convex portion.

  Then, when the tile rail is placed on the base sheet and nailing, the upper surface of the small convex portion of the base sheet is pressed by the bottom surface of the tile rail, but the internal space of each small convex portion is filled with water-absorbing polymer, respectively. Therefore, each small convex part is not crushed by the pressing force from the tiles.

  In addition, in the tiled roof using the base sheet of the present application, there is a gap of the height of the small convex part between the lower surface of the tile rail and the upper surface of the continuous flat portion of the sheet base material. Even if rainwater invades, most of the invading rainwater flows down the continuous flat surface on the upper surface of the sheet base material.

  By the way, when rainwater intrudes into the tile lower surface, a part of the rainwater may be placed on each small convex portion. In particular, if there is a lot of rain when roofing is exposed during roof construction (before roofing), the top surface of the roofing becomes wet and rainwater tends to be placed on the top surface of each small convex part. (Especially, rainwater concentrates and the small protrusions may be submerged in the valleys). And if rainwater falls on the small convex part, there is a possibility that the rainwater may invade into the internal space from the vent hole, but since the internal space of the small convex part is filled with water-absorbing polymer, Rainwater that has entered the space is absorbed by the water-absorbing polymer, and the rainwater that has entered the internal space does not wet the base plate under the base sheet.

  On the other hand, for example, even when the attic is in high humidity during rainy weather, when the weather is fine (the outside air becomes low humidity), the moisture in the attic passes through the field plate, and the thin sheet of this base sheet and the water absorbing polymer in the small convex portion Through the air holes of the small convex portions, the roof is released to the upper surface side (outside air side), and the humidity of the attic is lowered to the outside air humidity in a short time.

  In addition, when using the base sheet for building of this application as a base material for walls, it is installed inside the exterior material of the wall body in a state where the small convex part protruding side of the sheet base material faces the outer surface side of the building. . Also in this case, even if rainwater enters beyond the wall exterior material, the rainwater is blocked by the base sheet, while the base sheet has air permeability through the air holes, so that condensation occurs on the inner surface side of the base sheet. Nothing will happen. Further, the water-absorbing polymer in each small convex portion has both functions of reinforcing each small convex portion and absorbing intruding rainwater from the vent hole.

  The building foundation sheet of the present invention has the following effects.

  (1) Since a large number of small convex portions are formed on the sheet base material, for example, when used as roofing for a tiled roof, between the roof top surface (the top surface of the continuous flat portion of the sheet base material) and the tile pier A gap can be formed by the height of the small convex portion, and the gap serves as a flow-in passage for the intruding rainwater, thereby preventing the trouble of blocking the intruding rainwater by the roof tile.

  (2) The water absorbing polymer is filled in the internal space of each small convex part, and a thin sheet is stuck on the lower surface of the sheet base material so that the water absorbing polymer is sealed in each internal space. Becomes a reinforcing member for the small convex portion, and even if the upper surface of each small convex portion is pressed by the roof rail, the small convex portion is not deformed (crushed). Therefore, the clearance gap between a roofing upper surface and a roof tile lower surface can be maintained reliably.

  (3) A small ventilation hole is formed in each small convex part, and the water-absorbing polymer filled in the internal space of the small convex part and the thin sheet on the lower surface of the sheet base material are breathable, ensuring a waterproof function In addition, air permeability can be secured, and condensation on the inner surface side of the base sheet can be prevented.

  (4) Even if some of the rainwater that has entered the bottom of the tile enters the internal space of the small convex portion from the vent on the top surface of the small convex portion, the intruding rainwater can be absorbed by the water absorbing polymer in the internal space. Even if the air permeability is ensured by the vent hole, the field board is not wetted by rainwater that has entered from the vent hole.

  The building foundation sheet of the present embodiment will be described with reference to FIGS. 1 to 3. In this embodiment, a roofing Z used for a tiled roof is adopted as the building foundation sheet.

  The tiled roof shown in FIGS. 1 to 3 has the roofing Z of the present embodiment laid on the roof base plate 5, and tile tiles 6, 6... For tile positioning are mounted on the roof by nailing. The roof tiles 7, 7. Since the roof base plate 5 is made of wood, it has moisture permeability (humidity adjustment function inside and outside the attic). In addition, there is a slight gap between the field boards 5 and 5, and the humidity inside and outside the attic can be adjusted from the gap between the field boards 5 and 5.

  The roofing Z used in the embodiment of FIGS. 1 to 3 forms a large number of small convex portions 2, 2... Extruded on one side with a small space in the front, rear, left and right directions on a waterproof sheet base material 1. On the other hand, the basic structure is that a minute vent hole 3 is formed in the vicinity of the center of each small convex portion 2, 2,..., But in addition to that, each small convex portion 2, 2,. Are filled with water-absorbing polymers 10, 10... Respectively, and a breathable thin sheet 11 is attached to the lower surface of the sheet substrate 1 to respectively provide the water-absorbing polymers 10, 10. It is enclosed in each internal space 2a, 2a.

  As the sheet substrate 1, a sheet or nonwoven fabric with asphalt attached (impregnated or coated), or a sheet of nonwoven fabric coated with two sheets of paper or nonwoven fabric on the front and back sides of the asphalt layer can be employed. Moreover, as this sheet | seat base material 1, the thing of a plastic type | system | group and a rubber type (each has waterproofness) can also be used. The thickness of the sheet substrate 1 is not particularly limited, but about 0.5 to 1 mm is appropriate.

  In this embodiment, the small convex portions 2, 2,... Of the sheet base material 1 have a diameter of about 5 to 10 mm and a height of about 3 to 5 mm. (Center interval). In addition, between the outer surfaces of each small convex part 2 and 2, the moderate space | interval (for example, about 5 mm width) which can flow water is formed.

  In this embodiment, the small convex portions 2, 2,... Are extruded in a circular shape in a plan view and a trapezoidal shape in a side view, but may be formed in an appropriate shape such as a spherical shape. Each of the small convex portions 2, 2,... Can be easily extruded by a press molding machine.

  The portions other than the small convex portions in the sheet substrate 1 are continuous flat portions 4 that are continuous in a flat state. Then, when rainwater enters the lower surface side of the roof tile 7 (arrow W in FIG. 2), the continuous flat portion 4 becomes a flow-in passage for the intruding rainwater as indicated by an arrow W in FIG.

  The air holes 3, 3,... Formed in the small convex portions 2, 2,... Are formed to have a minute diameter of about 0.5 to 1 mm, for example. The vent holes 3, 3... May be perforated simultaneously with the molding of the small convex portion 2.

  The water-absorbing polymer 10, 10... Filled in the internal space 2a of each small convex portion 2, 2... Is filled in the internal space 2a of each small convex portion 2 in a full state. The water-absorbing polymer 10 is an aggregate of small particles (for example, a diameter of about 0.5 to 2 mm) so that air can flow through gaps between the small particles. In addition, as a kind of this water absorption polymer 10, a general purpose thing like an acrylate type can be used, for example.

  The thin sheet 11 affixed to the lower surface of the sheet substrate 1 has air permeability, and for example, a nonwoven fabric can be adopted. And by sticking the thin sheet 11 on the lower surface of the sheet substrate 1, the above water-absorbing polymers 10, 10,... Are enclosed in the internal cavities 2a, 2a,. ing. In this state, the water-absorbing polymer 10 does not leak through the thin sheet (nonwoven fabric) 11.

  When used as roofing for a tiled roof, the building foundation sheet Z is laid on the roof base plate 5 so that the small convex portions 2, 2,. Then, the tiles 6, 6,... Are mounted on the base sheet Z (nailed to the base plate 5), and the tiles 7, 7,. Complete the roof construction. The tile rails 6, 6... Are attached in the roof width direction with a predetermined interval in the roof inclination direction.

  In the state where the roofing Z is laid on the base plate 5, the thin sheet 11 on the lower surface of the sheet base material 1 is bonded to the upper surface of the base plate 5, so that each water-absorbing polymer 10, 10. It remains held in the internal space 2a. Then, when the roof tile 6 is placed on the roofing Z and nailed, the upper surface of the small convex portion 2 of the roofing Z is pressed by the lower surface of the roof tile 6, but the width of the roof tile 6 (width in the roof inclination direction) is 30. Since there are about ˜40 mm, the tile frame 6 is placed across a plurality (2 to 3) small convex portions 2 and 2 in the roof inclination direction. It is supported by small convex portions 2, 2,.

  By the way, when the roof tile 6 is supported by a large number of small convex portions 2, 2,..., The load (compression force) applied to the small convex portion 2 per nail when the roof rail 6 is nailed is relatively small. However, even when nailing, a considerable impact force is applied to each small convex portion 2, 2... In contact with the tile rail 6 (the small convex portion may be compressed and deformed). Further, after the construction, a load is constantly applied to the roof tile 6 due to the weight of each roof tile 7, 7,..., And the small convex portions 2, 2,. There is also a fear.

  However, in the roofing Z of this embodiment, each of the small convex portions 2, 2,... Is filled with the water absorbing polymer 10 in the internal space 2a of each small convex portion 2, 2,. Reinforced (backed) by the polymer 10, the small convex portions 2 are not crushed by the pressing force from the roof tile 6 (the protruding shape of each small convex portion 2 under the roof rail 6 is maintained as it is. )

  In the tiled roof using the roofing Z of this embodiment, a gap corresponding to the height of the small convex portion 2 is provided between the lower surface of the tile rail 6 and the upper surface of the continuous flat portion 4 of the sheet base material 1. Even if rainwater W enters through a gap or the like, the intruded rainwater W flows down the continuous flat surface portion 4 on the upper surface of the sheet base material 1 as indicated by a symbol W in FIG. become. Accordingly, the roof tile 6 does not get wet with the intruding rainwater W.

  By the way, when rainwater W enters the tile lower surface side, a part of the rainwater may be placed on the small convex portions 2, 2. In particular, if there is a lot of rain with roofing Z exposed during roofing (before roofing tile 7), the top surface of the roofing will be wet and rainwater will fall into each small convex part 2, 2,. (In particular, rainwater concentrates on the portion that is a trough, and the small convex portion 2 may be submerged). Although the vent hole 3 of the small convex portion 2 has a small diameter, the rainwater placed on the small convex portion 2 still passes through the vent hole 3 as shown by the symbol Wa in FIG. It is conceivable to enter the place 2a. However, since the internal space 2a of the small convex portion 2 is filled with the water-absorbing polymer 10, and a very small amount of rainwater Wa enters the vent hole 3, the rainwater Wa that has entered the internal space 2a is absorbed by the water-absorbing polymer. 10 is absorbed. Therefore, even if rainwater Wa enters the internal space 2a, the ground plate 5 is not wetted by the rainwater Wa. In addition, the water | moisture content absorbed in the water absorption polymer 10 evaporates through the vent hole 3 or the thin sheet 11 at the time of fine weather, and this water absorption polymer 10 returns to the original dry state in a comparatively short time.

In the roofing Z of this embodiment, the small convex portions 2, 2,... Each have a vent hole 3, and the water-absorbing polymer 10 filled in the internal space 2a of the small convex portion 2 is also breathable. Since the thin sheet 11 on the lower surface of the sheet base material 1 is also air permeable, moisture can freely move inside and outside the roofing Z, so that condensation occurs between the field board 5 and the roofing Z even if the temperature drops at night. There is nothing to do. Further, even in a high humidity state during rainy weather, when the weather is fine (the outside air becomes low humidity), as shown in FIG. 3, first, the moisture between the base plate 5 and the roofing Z is changed to the small convex portions 2. 2... Is discharged from the inner space 2 a through the air holes 3, 3... To the upper surface side of the roofing (outside air side) as shown by S ₁ , and then the ceiling (the lower surface side of the base plate 5) As shown by reference numeral S ₂ , the moisture infiltrates through the field plate 5 or passes through the gaps between the field plates 5 and 5, and moves to the upper surface of the field plate.・ ・ Because it is discharged through the roof top surface, the inside of the attic will dry in a relatively short time.

  Thus, the roofing Z of the embodiment of the present application has both a waterproof function against intruding rainwater and a humidity releasing function on the lower surface side of the sheet base material by the small convex portion 2 and the vent hole 3. By filling the internal space 2 a of the portion 2 with the water absorbing polymer 10, the water absorbing polymer 10 can have a reinforcing function for the small convex portion 2 and a water absorbing function for the intrusion rain water Wa from the vent hole 3.

  In another embodiment of the present application, the sheet base material 1 may be manufactured as follows. That is, a non-woven fabric having air permeability (fibers are entangled in a fine mesh shape) is used as the material of the sheet base material 1 and embossed to such an extent that the non-air-permeable property is not lost. After forming the part 2, you may manufacture by waterproofing the part except the top part of each small convex part 2 of this sheet | seat base material 1 (for example, impregnating with asphalt). In this case, the top of each small convex portion 2 of the sheet substrate 1 is maintained in a fine mesh, and the top of each small convex portion 2 has air permeability, while the other portions are All are waterproof. Therefore, even when such a sheet base material is used, a roofing having a function similar to that of the above-described embodiment can be manufactured.

  In addition to the roof roofing, the building foundation sheet of the present application can also be used as a wall foundation material. In that case, this building base sheet is installed inside the exterior material of the wall body in a state in which the small convex portion protruding side of the sheet base material 1 faces the outer surface side of the building.

It is a perspective view at the time of using the foundation | substrate ground sheet of an Example for this application as roof roofing. It is the II-II cross-section equivalent figure of FIG. It is the III-III expanded sectional view of FIG. It is sectional drawing of the conventional common tiled roof. It is a perspective view at the time of using a well-known (patent document 1) building base sheet as roof roofing. FIG. 6 is a cross-sectional view corresponding to the section VI-VI in FIG. 5. It is VII-VII expanded sectional drawing of FIG.

Explanation of symbols

  1 is a sheet base material, 2 is a small convex part, 2a is an internal space, 3 is a vent hole, 4 is a continuous flat part, 5 is a base plate, 6 is a roof rail, 7 is a roof tile, 10 is a water absorbing polymer, 11 is Thin sheet, Z is roofing.

Claims (1)

A plurality of small convex portions (2, 2,...) Extruded on one side with a small interval in the front, rear, left, and right directions are formed on the waterproof sheet substrate (1), and each small convex portion (2, 2,.・) A base sheet for construction formed by forming minute ventilation holes (3, 3,...) Near the center of each
The internal spaces (2a, 2a,...) Of the small convex portions (2, 2,...) Are filled with water-absorbing polymers (10, 10,...), Respectively, and the sheet base material (1) A breathable thin sheet (11) is attached to the lower surface and the water-absorbing polymer (10, 10,...) Is enclosed in each internal space (2a, 2a,...)
An architectural foundation sheet characterized by this.

Images