JP2012215061A - Waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof sheet having sufficiently high ventilating performance.SOLUTION: The waterproof sheet comprises: an asphalt compound layer 11; multilayer-sheet layers 12 each having a plurality of openings 17; and a release sheet layer 13 laminated in sequence. The asphalt compound layer 11 has a self-adhesion property. The multilayer-sheet layers 12 each have a synthetic resin layer 14 contacting the asphalt compound layer 11 and a non-woven fabric layer 15 contacting the release sheet layer 13. The non-woven fabric layer 15 has a basis weight of 10-100 g/m, a thickness of 0.10-0.50 mm and a bulk density of 100-183 kg/m.

Description

  The present invention relates to a self-adhesive type waterproof sheet that can be laid on a rooftop, a veranda, a floor or the like.

  Conventionally, by providing a breathable layer on an asphalt-based waterproof sheet, it has been performed to suppress swelling and peeling of the waterproof sheet layer caused by water or water vapor generated between the base layer such as concrete and the waterproof sheet layer. Yes. Specifically, by providing an adhesive layer partially in the lowermost layer of the waterproof sheet, ventilation is ensured by a communicating part (venting part) that does not adhere.

  In Patent Document 1, in the thermal construction asphalt waterproofing, it is an underlaying roofing sheet used in the first layer, and a water-impermeable sheet made of bituminous material, an insulating layer, an adhesive layer, and a release sheet are sequentially laminated, There is disclosed an underlaying roofing sheet in which an adhesive material is partially applied so that the adhesive layer is in a state where all the portions where the adhesive material is not present are in communication.

  In Patent Document 2, a waterproof layer with a pressure-sensitive adhesive layer formed so that a part provided with a pressure-sensitive adhesive layer on the surface located on the construction surface side and a part where the pressure-sensitive adhesive layer on the surface located on the construction surface side is not provided communicates. After attaching the waterproof sheet attaching step for attaching the end portion and the end portion in the longitudinal direction of the sheet to the construction surface, and after attaching the waterproof sheet, the end portion and the end portion in the longitudinal direction of the waterproof sheet with the adhesive layer were overlapped After fixing the waterproof sheet with the adhesive layer to the construction surface by hitting the locking member on the construction surface, and the waterproof sheet construction surface fixing process, the waterproof coating film on the adhesive sheet with the adhesive layer after the waterproof sheet construction surface fixing process The construction method using the waterproof sheet with the adhesion layer provided with the coating process which applies a material or sticks an asphalt sheet is indicated.

  Patent Document 3 discloses a breathable composite waterproof method having a step of laying an asphalt waterproof sheet on the construction surface of a structure and a step of applying and curing a polymer cement composition on the upper surface of the asphalt waterproof sheet. A breathable composite waterproofing method in which the lowermost surface of the asphalt waterproof sheet is partially self-adhesive is disclosed. By this construction method, the effect of preventing swelling and peeling of the waterproof layer due to water or water vapor generated between the underlayer of concrete or the like and the waterproof layer is high, and the followability to cracks of the underlayer is excellent and extremely excellent. It describes that it has both waterproofness, durability and good workability, and can form a flat finished surface.

JP-A-1-223259 JP 2007-170015 A JP 2008-240255 A

  However, in the conventional waterproof sheet, there is a partial adhesion on the surface of the waterproof sheet due to a partial adhesive layer, and it is difficult to obtain a flat and aesthetically pleasing floor surface. The oil content in the asphalt layer of the waterproof sheet oozes out to the ventilation portion (venting layer), and the ventilation performance may be lowered. Moreover, even if the surface of the waterproof sheet is reduced by providing a breathable member in the communicating ventilation part (vent layer), the waterproof sheet layer cannot be secured sufficiently even if the unevenness of the waterproof sheet surface is reduced, and the waterproof sheet layer is caused by moisture or water vapor. As a result, the waterproof sheet is required to be further improved in performance.

  An object of the present invention is to provide a waterproof sheet having sufficiently high ventilation performance.

  As a result of detailed studies, the present inventors have found that the above problems can be solved by a waterproof sheet having a specific multilayer sheet, and have completed the present invention.

That is, the present invention is a waterproof sheet in which an asphalt compound layer, a multilayer sheet layer having a plurality of openings, and a release sheet layer are laminated in this order, and the asphalt compound layer is self-adhesive, and is a multilayer sheet. The layer includes a synthetic resin layer in contact with the asphalt compound layer and a nonwoven fabric layer in contact with the release sheet layer. The nonwoven fabric layer has a basis weight of 10 to 100 g / m ² and a thickness of 0.10 to 0.50 mm. A waterproof sheet having a bulk density of 100 to 183 kg / m ³ is provided.

  The above waterproof sheet has sufficiently high ventilation performance, and prevents the waterproof sheet from swelling and peeling due to water vapor and moisture generated from the construction surface remaining in the ventilation part (vent layer) of the waterproof sheet. Can do.

  The opening part of the multilayer sheet preferably has a circular and / or elliptical shape.

  From the viewpoint of improving the balance between adhesion to an adherend such as concrete and the breathability of the waterproof sheet when constructing the waterproof sheet, the circular diameter is 35 to 55 mm when the opening is circular. When the opening is elliptical, the elliptical minor axis is preferably 30 to 50 mm, and the major axis is preferably 1.1 to 1.3 times the minor axis.

  In the waterproof sheet, the synthetic resin layer contains at least one resin selected from the group consisting of ethylene / vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, polyamide, polyethylene, and polyethylene terephthalate. Oil exudation in the compound layer can be suppressed.

  According to the present invention, it is possible to provide a waterproof sheet having sufficiently high ventilation performance. The waterproof sheet of the present invention has sufficient ventilation performance and ventilation capacity maintenance performance, and is caused by water vapor and moisture generated from the upper surface of a concrete structure or the like remaining in the ventilation portion (vent layer) of the waterproof sheet. Sheet swelling and peeling can be prevented. Further, by using a breathable member (predetermined nonwoven fabric) for the communicating vent portion (breathing layer), it is possible to obtain a flat and excellent waterproof sheet surface.

It is sectional drawing which shows typically a part of waterproof sheet which concerns on this embodiment. It is a top view which shows typically a part of waterproof sheet after removing a peeling sheet. It is a figure which shows typically the example of arrangement | positioning of the circular opening part which a multilayer sheet has. It is a figure which shows typically the example of arrangement | positioning of the elliptical opening part which a multilayer sheet has.

The waterproof sheet of the present invention includes an asphalt compound layer (hereinafter, sometimes referred to as “A layer”), a multilayer sheet layer having a plurality of openings (hereinafter, sometimes referred to as “B layer”), and a release sheet layer ( Hereinafter, in some cases, the “C layer” is laminated in this order, the asphalt compound layer has self-adhesiveness, and the multilayer sheet layer is a synthetic resin layer in contact with the asphalt compound layer (hereinafter, sometimes “ B1 layer) and a nonwoven fabric layer in contact with the release sheet layer (hereinafter sometimes referred to as “B2 layer”). The nonwoven fabric layer has a basis weight of 10 to 100 g / m ² and a thickness of 0. It is 10-0.50 mm, and a bulk density (bulk specific gravity) is 100-183 kg / m < ³ >, It is characterized by the above-mentioned.

  Hereinafter, the waterproof sheet according to the present embodiment will be described with reference to the drawings as appropriate.

  FIG. 1 is a cross-sectional view schematically showing a part of the waterproof sheet 1 according to the present embodiment. FIG. 2 shows the multilayer sheet layer 12 after the release sheet layer 13 is peeled and removed from the waterproof sheet shown in FIG. It is a top view which shows the part seen from the side typically.

  The waterproof sheet 1 is laminated in the order of a self-adhesive asphalt compound layer (A layer) 11, a multilayer sheet layer (B layer) 12 having a plurality of openings 17, and a release sheet layer (C layer) 13. When installing the waterproof sheet 1 on the construction surface of the structure, the C layer 13 is peeled and removed after the A layer 11 is attached to the construction surface.

  In addition, a multilayer sheet on the release sheet layer (C layer) 13 on either one of the ends in the short side direction (long side direction) of the waterproof sheet 1 so that the waterproof sheet 1 can be used in an overlapping manner. A portion (hereinafter referred to as an “overlapping portion”) 16 where the layer (B layer) 12 is not stacked can be provided. The width of the overlapping portion 16 is preferably 100 mm or more. When the waterproof sheet 1 is laid, the overlapping part 16 of the waterproof sheet 1 is laid first in the short side direction of the adjacent waterproof sheet 1 laid in the short side direction of the adjacent waterproof sheet 1 previously laid. A good waterproof performance can be secured by laying on the end portion.

(Asphalt compound layer)
The asphalt compound layer (A layer) is not particularly limited, and a modified asphalt composition used for a general waterproof sheet can be appropriately selected and used. As the modified asphalt composition, a modified asphalt composition containing asphalt, a styrene synthetic rubber, a tackifier, and an inorganic filler (inorganic filler) can be suitably used. The modified asphalt composition has various characteristics by changing the blending ratio of the constituent materials.

  The blending ratio of asphalt is preferably 25 to 90 mass%, more preferably 30 to 70 mass%, still more preferably 35 to 50 mass% based on the modified asphalt composition. Asphalt is obtained by distilling crude oil at normal pressure or reduced pressure to remove gasoline, kerosene, light oil, lubricating oil, etc., and asphalt with a penetration of about 10 to 250 can be suitably used.

  As the asphalt, straight asphalt, blown asphalt, or the like can be used. As asphalt, blown asphalt can be used in combination to improve the softening point and shearing force of straight asphalt, and the blending ratio of blown asphalt in this case is preferably 40% by mass or less based on the total mass of asphalt. More preferably, it is 30 mass% or less. When the blending ratio of blown asphalt exceeds 40% by mass, the viscosity of the modified asphalt composition increases and the impregnation property of the base material constituting the waterproof sheet such as nonwoven fabric decreases, or the waterproof sheet is flexible at low temperatures. May deteriorate.

  Styrene-based synthetic rubbers include styrene / butadiene copolymers, styrene / butadiene / styrene block copolymers, styrene / isoprene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, and styrene / ethylene / copolymers. At least one selected from propylene / styrene block copolymers can be used. Of these, styrene / butadiene / styrene block copolymers are preferably used. A polymer obtained by modifying the above copolymer with a functional group can also be used.

  The blending ratio of the styrene synthetic rubber is preferably 5 to 30 parts by mass, more preferably 6 to 28 parts by mass, still more preferably 7 to 26 parts by mass, and particularly preferably 8 to 25 parts by mass with respect to 100 parts by mass of asphalt. It is. If the blending ratio of the styrene synthetic rubber is less than 5 parts by mass, it may be difficult to obtain a practically sufficient shear bond strength, and if it exceeds 30 parts by mass, the viscosity of the modified asphalt composition becomes high, and the base of a nonwoven fabric or the like. Impregnation into the material may be reduced.

  From the viewpoint of appropriately improving the self-adhesiveness of the modified asphalt composition, an appropriate amount can be blended by appropriately selecting a tackifier such as process oil or polybutene.

  Examples of inorganic fillers include calcium carbonate, magnesium silicate, calcium silicate, aluminum silicate, anhydrous silicic acid, clay, carbon black, talc, mica, barium sulfate, diatomaceous earth, silica and other particulate inorganic fillers, wallast A fibrous inorganic filler such as knight or glass fiber can be used.

  In the modified asphalt composition, various additives such as a synthetic resin other than the styrene-based synthetic rubber can be appropriately selected and further blended within a range that does not impair the characteristics of the present invention.

  The softening point of the modified asphalt composition is preferably 70 to 130 ° C, more preferably 80 to 120 ° C, from the viewpoint of productivity, processability and fuel cost when producing a waterproof sheet. Further, from the viewpoint of the productivity and processability of the waterproof sheet, the viscosity of the modified asphalt composition is preferably 20,000 to 130,000 cps, more preferably 25,000 to 120,000 cps, and further preferably 30,000 to 110,000 cps.

  Although the thickness of A layer 11 is not specifically limited, Preferably it is 0.5-2.0 mm, More preferably, it is 0.6-1.6 mm, More preferably, it is 0.7-1.4 mm, Especially preferably, it is 0.8-1.2 mm.

(Multilayer sheet)
The multilayer sheet layer (B layer) 12 having a plurality of openings comprises a synthetic resin layer (B1 layer) 14 in contact with the asphalt compound layer (A layer) 11 and a nonwoven fabric layer (B2 layer) in contact with the release sheet layer (C layer) 13. 15).

  The synthetic resin layer (B1 layer) 14 preferably contains at least one resin selected from the group consisting of an ethylene / vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, polyamide, polyethylene, and polyethylene terephthalate. Moreover, the synthetic resin layer (B1 layer) 14 can be used by laminating two or more synthetic resin layers having different resin compositions.

  By the presence of the synthetic resin layer (B1 layer) 14 in contact with the asphalt compound layer (A layer) 11, oil in the asphalt compound layer (A layer) 11 oozes out to the nonwoven fabric layer (B2 layer) 15, It can suppress that the air flow rate of the nonwoven fabric layer (B2 layer) 15 falls with progress of time.

  The thickness of the B1 layer 14 is preferably 5 to 30 μm, more preferably 7 to 25 μm, still more preferably 10 to 20 μm, and particularly preferably 12 to 18 μm.

  The nonwoven fabric layer (B2 layer) 15 is preferably composed of a nonwoven fabric composed of synthetic resin fibers or chemical fibers, and more preferably composed of a nonwoven fabric composed of synthetic fibers. The synthetic resin is not particularly limited, and examples thereof include polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyolefins such as polyethylene and polypropylene, and polyacrylonitrile. These synthetic resin fibers can be used alone or in combination.

The basis weight of the nonwoven fabric constituting the nonwoven fabric layer (B2 layer) 15 is 10 to 100 g / m ² , preferably 15 to 75 g / m ² , more preferably 20 to 50 g / m ² , still more preferably. 25-35 g / m ² .

  The nonwoven fabric has a thickness of 0.10 to 0.50 mm, preferably 0.12 to 0.40 mm, more preferably 0.14 to 0.30 mm, and still more preferably 0.16 to 0.00. 20 mm.

The bulk density of the nonwoven fabric is 100 to 183 kg / m ³ , preferably 120 to 180 kg / m ³ , more preferably 140 to 175 kg / m ³ , and still more preferably 160 to 170 kg / m ³ . .

  By adjusting the basis weight, thickness and bulk density of the nonwoven fabric constituting the nonwoven fabric layer (B2 layer) 15 to the above range, when the waterproof sheet is laid and bonded on the upper surface of concrete or the like, it has sufficient ventilation performance, A waterproof sheet having a flat surface and excellent aesthetics can be obtained. Here, the sufficient ventilation performance is an evaluation method based on the 1986 version of the building construction standard specification JASS-8 “Ventilation resistance test between the foundation” and the ventilation rate when 10 mmAq of pressurized air is blown. Is 170 mL / min or more. If the air flow rate is less than 170 mL / min, water vapor or moisture generated from the upper surface of concrete or the like may cause swelling or peeling of the waterproof sheet due to staying in the ventilation part (vent layer) of the waterproof sheet. is there.

  The multilayer sheet layer (B layer) 12 is composed of a synthetic resin layer (B1 layer) 14 in contact with an asphalt compound layer (A layer) 11 and a nonwoven fabric layer (B2 layer) 15 in contact with a release film layer (C layer) 13. In addition, the oil content in the asphalt compound layer (A layer) 11 oozes out to the non-woven fabric layer (B2 layer) 15, and in particular, suppresses further reducing the air flow rate of the non-woven fabric layer (B2 layer) 15 over time. it can.

  An asphalt compound layer (A layer) 11 is exposed in a plurality of openings 17 provided in the multilayer sheet layer (B layer) 12, and the release sheet layer (C layer) 13 is peeled off and removed. Is laid on the upper surface of concrete or the like, so that the exposed asphalt compound layer (A layer) 11 and the upper surface of the concrete or the like adhere to each other. Further, a waterproof sheet may be laid after a primer for a waterproof sheet is previously applied to an upper surface of concrete or the like to form a primer layer for the waterproof sheet.

  The shape of the plurality of openings provided in the multilayer sheet layer (B layer) 12 is such that the adhesive portion between the upper surface of concrete or the like and the asphalt compound layer (A layer) 11 has strong adhesive strength, and the nonwoven fabric layer ( From the viewpoint of reducing the ventilation resistance of steam or moisture moving in the (B2 layer) (improving the air permeability), a circular shape and / or an elliptic shape are preferable.

  FIG. 3 is a diagram schematically illustrating an arrangement example of circular openings included in the multilayer sheet. FIG. 4 is a diagram schematically illustrating an arrangement example of elliptical openings included in the multilayer sheet. As shown in FIGS. 3 and 4, the openings 17 are arranged so that circular openings and / or elliptical openings are arranged in a staggered pattern, providing good air permeability and water permeability (evaporated from concrete or the like). Moisture). When the opening 17 is circular, the diameter of the opening 17 is preferably 35 to 55 mm, more preferably 38 to 52 mm, still more preferably 40 to 50 mm, and particularly preferably 42 to 48 mm. By setting the diameter of the opening 17 in the above range, good characteristics can be obtained in both the adhesive strength between the waterproof sheet and the upper surface of the concrete and the breathability of the waterproof sheet. When the opening 17 is oval, the short diameter of the opening 17 is preferably 30 to 50 mm, more preferably 33 to 49 mm, still more preferably 35 to 45 mm, and particularly preferably 38 to 43 mm. Moreover, the major axis of the opening part 17 is 1.1 to 1.3 times the minor axis of the opening part, and the adhesive strength between the waterproof sheet and the upper surface of the concrete and the waterproof sheet and the upper surface of the concrete, etc. Good characteristics can be obtained both in terms of air permeability.

  The distance between the centers of the openings 17 is preferably 60 to 130 mm, more preferably 65 to 110 mm, still more preferably 70 to 100 mm, with respect to the short side direction 25 of the waterproof sheet. is there. About the long side direction 26 of a waterproof sheet, the space | interval 21 between opening part centers becomes like this. Preferably it is 70-260 mm, More preferably, it is 85-240 mm, More preferably, it is 100-200 mm. Further, the distance 22 between the centers of one opening and the opening located in the oblique direction is preferably 45 to 150 mm, more preferably 50 to 130 mm, and still more preferably 55 to 100 mm. Since the distance between the centers of the openings 17 is in the above range, a sufficient adhesion area between the waterproof sheet and the upper surface of concrete or the like can be secured, and stable air permeability can be provided between the waterproof sheet and the upper surface of concrete or the like. It can be secured.

(Peeling sheet layer)
The release sheet layer (C layer) 13 is not particularly limited as long as it can be easily peeled off from the asphalt compound layer. For example, release paper or release film can be used. As the release paper and release film, those that have been creped and have excellent stretchability can be suitably used.

  Examples of the release paper include release paper obtained by laminating a polyolefin film such as low density polyethylene, high density polyethylene, and polypropylene on papermaking, and release paper obtained by further performing silicon treatment on the release paper. From the viewpoint of release performance, release paper subjected to silicon treatment is preferable.

  Specifically, a synthetic resin film can be used as the release film. Examples thereof include polyolefin films such as low density polyethylene, high density polyethylene, and polypropylene, polyester films such as polyethylene terephthalate and polybutylene terephthalate, and polyamides such as nylon 6. A film is mentioned. As the synthetic resin film, low density polyethylene is preferable because of its excellent flexibility. The synthetic resin film may be a uniaxially stretched or biaxially stretched film or an unstretched film. As the synthetic resin film, a laminated film in which two or more films are laminated can also be used.

  As a peeling film, what performed the silicon process in order to provide peelability to a synthetic resin film can be used. Further, it is more preferable to use a laminate processed with a resin such as polyethylene in order to give better peelability, and a release layer that has been subjected to silicon treatment.

  The thickness of the C layer may be an appropriate thickness that does not hinder manufacturing and is not easily damaged during construction or use, and is preferably 5 to 500 μm, more preferably 10 to 400 μm, and still more preferably 20 to 300 μm. is there. As the C layer, it is preferable that the asphalt contained in the asphalt compound layer is difficult to permeate, and the clothes and shoes of the installer, building members, roof members and the like are not soiled.

  The waterproof sheet according to the present embodiment can be further laminated with a material on the asphalt compound layer (A layer) 11 depending on the application.

  Examples of materials include aggregates, nonwoven fabrics, synthetic resin films, waterproof sheets, polymer cement mortars, waterproof paints, and the like, which can be appropriately selected and used depending on the application. Moreover, in the case of an aggregate, a nonwoven fabric, and a synthetic resin film, it is also possible to laminate (integrate) on the asphalt compound layer (A layer) 11 in advance when manufacturing the waterproof sheet.

  The waterproof sheet of the present invention can be used as a self-adhesive waterproof sheet having air permeability that can be laid on a rooftop, a veranda, a floor or the like.

  The contents of the present invention will be specifically described below with reference to examples. Note that the present invention is not limited to these examples.

<Waterproof sheet production>
Example 1
B2 layer, polyester nonwoven fabric with a width of 1.0 m, a length of 1.5 m, a thickness of 0.18 mm, a basis weight of 30 g / m ² and a bulk density of 167 kg / m ³ , and a B1 layer of a polyethylene film with a thickness of 15 μm And a release sheet with a basis weight of 72 g / m ² which is a C layer (paper making with a polyethylene film laminated, with silicon treatment) laminated so that the B2 layer is in contact with the release paper, and 160 ° C. on the B1 layer surface. A waterproof sheet was prepared by laminating the melted asphalt compound (A layer).

(Comparative Example 1)
As the B layer, a multilayer sheet using a polyester nonwoven fabric having a width of 1.0 m, a length of 1.5 m, a thickness of 0.15 mm, a basis weight of 30 g / m ² , and a bulk density of 200 kg / m ³ is used. A waterproof sheet was produced in the same manner as in Example 1 except that the asphalt compound (A layer) melted at 160 ° C. was laminated to the B2 layer surface.

(Comparative Example 2)
Waterproofing in the same manner as in Example 1 except that a polyester nonwoven fabric having a width of 1.0 m, a length of 1.5 m, a thickness of 0.15 mm, a basis weight of 30 g / m ² and a bulk density of 200 kg / m ³ was used as the B layer. A sheet was produced.

<Evaluation of waterproof sheet>
(Ventilation resistance test)
Measured in accordance with the 1986 version of the building construction standard specification JASS-8 “Breath resistance test between groundwork”. At the time of measurement, the flow rate when 10 mmAq of pressurized air was blown from the air supply port was read from the flow meter.

(Preparation of test specimen)
According to the method "airflow resistance test between the foundation" 1986 edition building construction standard specification JASS-8, length 1200mm, after coating and drying the asphalt primer of 0.2kg / ^{m 2} on the slate plate of width 600mm, A sheet having a length of 1100 mm and a width of 500 mm was attached to prepare a test specimen.

  As shown in Table 1, it was confirmed that the waterproof sheet of Example 1 having the configuration of the present invention exhibits sufficient ventilation performance.

On the other hand, the waterproof sheet of Comparative Example 1 having a B2 layer with a bulk density exceeding 183 kg / m ³ and the B2 layer being in contact with the A layer showed a low value of 40 mL / min. . Further, the waterproof sheet of Comparative Example 2 has an improved air flow rate as compared with the waterproof sheet of Comparative Example 1 because the B1 layer inhibits oil in the A layer from seeping into the B2 layer. Since the B2 layer having a density exceeding 200 kg / m ³ is provided, the ventilation performance was not sufficient.

<Construction test under external environment>
Lamination (unification) in the order of the nonwoven fabric layer impregnated with asphalt on the A layer (asphalt compound layer 11) of Example 1, the asphalt layer not having self-adhesiveness, and the aggregate layer (excluding the overlapping portion) Using the waterproof sheet (8 m × 1 m), an area of about 50 m × 10 m on the concrete floor (construction surface) on the apartment roof was constructed.

  Specifically, the existing aging waterproof sheet laid on the construction surface was peeled off, and the adhesive, dust, and the like attached to the remaining construction surface were removed.

Next, asphalt primer (Ube Industries, trade name: RA primer) is uniformly applied to the concrete floor surface using a roller brush so that the coating amount is about 200 g / m ² and dried for 30 minutes. A primer layer was formed.

  Next, the asphalt compound layer 11 was adhered to the construction surface on which the primer layer was formed while peeling and removing the release sheet 13 of the waterproof sheet. Moreover, the edge part (overlapping part 16) of the short side direction of the waterproof sheet laid later was 100 mm, and the overlapping part was crimped with a rolling roller.

  When the state after about one month was confirmed after the construction of the waterproof sheet, no abnormality such as swelling, peeling or wrinkling of the waterproof sheet occurred at all, and a good finish was maintained. From this, it was confirmed that a waterproof sheet surface that was flat and excellent in aesthetic appearance was obtained.

  From the above, the waterproof sheet of the present invention has sufficient ventilation performance and ventilation capacity maintenance performance, and water vapor and moisture generated from the upper surface of concrete or the like remain in the ventilation portion (vent layer) of the waterproof sheet. It is possible to prevent swelling and peeling of the waterproof sheet. In addition, the use of a breathable member (predetermined nonwoven fabric) for the communicating vent portion (vent layer) can provide a flat and excellent waterproof sheet surface.

  DESCRIPTION OF SYMBOLS 1 ... Waterproof sheet, 11 ... Asphalt compound layer, 12 ... Multilayer sheet layer, 13 ... Release sheet layer, 14 ... Synthetic resin layer, 15 ... Nonwoven fabric layer, 16 ... Overlapping part, 17 ... Opening part, 20 ... Short side direction The distance between the centers of the openings adjacent to each other, 21. The distance between the centers of the openings adjacent to each other in the long side direction, 22. The distance between the centers of the openings adjacent to each other in the oblique direction, 23. 25 ... the short side direction of the waterproof sheet, 26 ... the long side direction of the waterproof sheet.

Claims (5)

Asphalt compound layer, a multilayer sheet layer having a plurality of openings, and a waterproof sheet in which a release sheet layer is laminated in this order,
The asphalt compound layer is self-adhesive;
The multilayer sheet layer comprises a synthetic resin layer in contact with the asphalt compound layer, and a nonwoven fabric layer in contact with the release sheet layer,
The nonwoven fabric layer is a waterproof sheet having a basis weight of 10 to 100 g / m ² , a thickness of 0.10 to 0.50 mm, and a bulk density of 100 to 183 kg / m ³ .   The waterproof sheet according to claim 1, wherein the opening has a circular and / or elliptical shape.   The waterproof sheet according to claim 2, wherein the circular diameter is 35 to 55 mm.   The waterproof sheet according to claim 2, wherein the elliptical minor axis is 30 to 50 mm, and the major axis is 1.1 to 1.3 times the minor axis.   The synthetic resin layer contains at least one resin selected from the group consisting of an ethylene / vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, polyamide, polyethylene, and polyethylene terephthalate. The waterproof sheet according to claim 1.

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