KR101713499B1 - Anti-microbial water-proofing sheet which built in the underground water tank - Google Patents

Abstract

The present invention relates to a waterproof sheet having antibacterial performance and a water tank waterproofing method using the same. The waterproof sheet has a predetermined amount of an antibacterial agent on the inner walls of a water tank formed in a water treatment facility to store water in the water tank in a hygienic manner by using the antibacterial agent included in the waterproof sheet. According to the present invention, the waterproof sheet makes the surfaces of the water tank waterproof by being coated thereon. For 100 parts by weight of the waterproof sheet, the waterproof sheet includes 1 to 10 parts by weight of the antibacterial agent for storing water in the water tank in a hygienic manner. The antibacterial agent includes charcoal, zeolite and phytoncide oil at the ratio of 4 to 6 : 2 to 3 : 2 to 3.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a waterproof sheet having antimicrobial properties and an anti-microbial water-

The present invention relates to a waterproof sheet having antimicrobial properties and a waterproofing method using the waterproof sheet. More particularly, the present invention relates to a waterproof sheet comprising a waterproof sheet containing a certain amount of an antimicrobial agent on the inner side wall of a water tank, The present invention relates to a waterproof sheet having antimicrobial properties that enables hygienic storage of water to be desiccated in the water tank by the contained antimicrobial agent, and a waterproofing method using the waterproof sheet.

Generally, the concept of waterproofing has been developed due to the watertightness, strength, load and impact of concrete in the construction of concrete structures, and the type of waterproofing can be classified into roof, indoor, , Asphalt waterproofing, sheet waterproofing, urethane waterproofing and rubber asphalt waterproofing have been applied.

In addition, there are water tank, water intake reservoir, water reservoir, water purification plant, and salt water storage structure such as concrete or steel structure water tank for desalinating a large amount of water. Therefore, waterproof lining is installed inside the water storage tank to secure durability of the water storage tank, Prevent contamination. In addition, the water tank is provided not only with concrete water tanks but also FRP water tanks provided with FRP materials, water tanks combining panels of metal materials, and the like.

Particularly, in the case of a concrete water tank, a certain frame is formed to form a mold, and concrete is filled in the mold to form a wall by the space formed by the mold.

Then, a waterproof lining is applied to the inner surface of the wall of the water tank to ensure the durability of the water tank and to prevent contamination of the water dewatered in the water tank. The waterproof lining is generally a wet type in which the resin is applied. However, the wet process is complicated in process, difficult to have uniform waterproofing property, and may cause problems due to harmful substances.

The waterproof structure of the concrete water tank using the polyethylene sheet of Japanese Patent No. 431533 includes a concrete water tank provided with drainage holes, a fixing unit for fixing the PE sheet to the inner wall surface of the concrete, And a piping portion fixed to the sleeve at the lower end of the water tank and having a flange coupled to the end of the sleeve.

The fixing part is fixed to the surface of the wall by a finishing member, and after the fixing sheet is fixed to the wall by a fixing pin for engaging the PE sheet, the waterproof PE sheet is joined to provide watertightness.

However, since the fixing sheet is fixed to the wall by inserting the fixing pin into the wall, it is possible to firmly fix the wall, but cracks may occur in the concrete wall due to damage of the wall.

As another example, Patent No. 1418537 provides a dry method in which a stainless steel is welded or a polyethylene-based waterproof sheet is attached.

However, the use of stainless steel is costly to install and may cause contamination due to the reaction with water in the welded portion of the stainless steel, or the strength of the stainless steel may be lowered. Also, when a polyethylene-based waterproof sheet is used, the waterproof sheet becomes thick to about 3 mm, so that foreign matter such as waterproof sheet can be lifted from the overlapping joint, or water stuck to the overlap joint can be generated.

Also, in the dry method, since the work surface needs to be dried again after cleaning the work surface before lining construction, it takes a long time for construction and is expensive for drying, and when the adhesion between the work surface and the waterproof sheet is not excellent, .

Particularly, a water tank which functions to store water therein has a problem in that the water of the fresh water is caught on the surface of the water tank, thereby causing desalination of unsanitary water by propagation of bacteria such as Escherichia coli or S. aureus in water .

Korean Patent Publication No. 10-725187 (2007.04.06 Announcement) Korean Patent Publication No. 10-1039239 (issued June 10, 2011) Korean Patent Publication No. 10-1645510 (Announcement 2014.08.04)

An object of the present invention is to provide a waterproofing sheet comprising a waterproof sheet containing a certain amount of an antimicrobial agent on the inner side wall of a water tank formed in a water treatment facility, And a waterproofing method using the waterproof sheet having antibacterial performance that enables hygienic storage of water to be desalinated in a water tank.

In order to attain the above object, the present invention provides a waterproof sheet which is applied to a water surface of a water tank to waterproof the water tank surface, wherein 1 to 10 parts by weight of the waterproof sheet is composed of 100 parts by weight of the waterproof sheet, And an antimicrobial agent for causing hygienic fresh water of the water to be desalinated to be carried out; The antimicrobial agent is characterized in that charcoal, zeolite, and phytoncide oil have a ratio of 4: 6: 2 to 3: 2: 3.

In the present invention, the waterproof sheet comprises: a first layer comprising an antimicrobial agent; And a second layer comprising a high-frequency inducing material; The first and second layers preferably have a thickness of 6 to 8: 2 to 4.

The present invention relates to a water tank waterproofing method using a waterproof sheet to be applied to a water tank surface so as to waterproof the water tank surface, the method comprising the steps of: removing foreign matters on a surface of a water tank; There is provided a fixing member for forming an engaging fixing groove having a predetermined gap on one surface thereof, wherein the engaging fixing grooves are crossed with each other to improve a coupling force with the adhesive for concrete, and a high frequency induction plate is embedded in the other surface ; Applying an adhesive for concrete to a fixing member for applying a predetermined thickness to one surface of the fixing groove, the adhesive being filled in the coupling fixing groove on one surface of the fixing member provided with the fixing member through the fixing member; ; A step of forming an insertion groove at a position where a fixing member is placed on a surface of a water tank and applying a concrete adhesive to the fixing member, Fixing the fixing member to the water tub surface so that the fixing member is firmly fixed to the water tub surface as the adhesive for concrete is hardened; And a step of fixing the fixing member to the surface of the water tub to closely contact the waterproof sheet on the fixing member fixed to the surface of the water tub. Then, the high frequency welding machine is pressed against the portion where the fixing member is located, And a step of thermally fusing a waterproof sheet and a fixing member for allowing the fixing member and the waterproof sheet to melt by a current to maintain a firm fixed state; In the waterproof sheet, it is preferable that the antibacterial agent is composed of charcoal, zeolite and phytoncide oil in a ratio of 4: 6: 2 to 3: 2: 3.

According to the present invention, the waterproof sheet containing a certain amount of the antimicrobial agent is applied to the inner sidewall of the water tank formed in the water treatment facility or the like, thereby enabling hygienic storage of the water to be dewatered in the water tank by the antibacterial agent contained in the waterproof sheet .

1 is a process diagram of a waterproofing method according to a first embodiment of the present invention;
2 is a perspective view of the fixing member according to the first embodiment of the present invention.
3 is a sectional view of the fixing member according to the first embodiment of the present invention.
4 is a state in which a fixing member is adhered to a surface of a water tank according to the first embodiment of the present invention.
5 is a view showing a state in which a waterproof sheet is fixed to a water tank surface according to the first embodiment of the present invention.
6 is a sectional view of a waterproof sheet according to a second embodiment of the present invention;
7 is a view showing a state in which a waterproof sheet is fixed to a water tank surface according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

≪ Embodiment 1 >

The waterproof sheet 10 of the first embodiment contains 1 to 10 parts by weight of the antimicrobial agent per 100 parts by weight of the subject, so that sanitary water can be desiccated in the water tank by the antibacterial action.

The waterproof sheet 10 is preferably a high molecular weight synthetic resin containing a polymer resin (60% or more) as a main component. For example, the polymer resin may be selected from the group consisting of polyethylene (PE), linear low density polyethylene (LLDPE), ethylenevinylacetate (EVA), vinylacetate (VA), ethylene copolymerized bitumen , ECB), and the like.

For example, the waterproof sheet 10 may include EVA and LLDPE in an amount of 40 to 60 parts by weight based on 100 parts by weight of the waterproof sheet 10 so that the waterproof sheet 10 may have excellent waterproof and antibacterial properties. In this case, if the EVA is less than 40 parts by weight or the LLDPE exceeds 60 parts by weight, the antibacterial property may not be sufficient. If the EVA is more than 60 parts by weight or the PPDPE is less than 40 parts by weight, the waterproof property may not be excellent. Of course, the present invention is not limited thereto, and any material that is water-friendly and water-proof can be used so as to be suitable for use in a water tank.

The antimicrobial agent is added to the waterproof sheet 10 to improve the antibacterial performance of the waterproof sheet 10, thereby enabling hygienic desalination of water to be watered in the water tank.

The antimicrobial agent is added in an amount of 1 to 10 parts by weight based on 100 parts by weight of the waterproof sheet (10). In this case, when the amount is less than 1 part by weight, the antibacterial performance is not exhibited, while when it exceeds 10 parts by weight, the waterproof performance of the waterproof sheet is deteriorated.

In the antibacterial agent, charcoal, zeolite and phytoncide oil are mixed in a weight ratio of 4: 6: 2 to 3: 2: 3.

The above-mentioned charcoal is produced by charring wood from a charcoal kiln, and has many pores having a surface area of 300 to 2,000 m 2 per g, and is used as a decolorizing agent, a deodorant, an adsorbent and the like.

Charcoal also has deodorizing, deodorizing, filtration, adsorption effect as well as minerals as well as sterilizing function by emitting far infrared rays and negative ions into the air thanks to the porous structure filled with micro holes.

The char is preferably formed in a size of 0.1 to 1 mm. In this case, when the thickness is less than 0.1 mm, the sterilizing performance is deteriorated, and when it exceeds 1 mm, the waterproof sheet is affected.

The zeolite is a crystalline aluminum silicate mineral which collectively refers to minerals in which alkali metals and alkaline earth metals are combined with anions generated by the bonding of aluminum oxide and silicate oxide. It is a kind of hydrated aluminum silicate mineral which mainly contains an alkali metal or an alkaline earth metal and is characterized in that a large gap exists in the central part because the tetrahedron of (Si, Al) O4 is bonded in a cubic network. The diameter of the gap may exceed 0.6 mm. The general formula is (WmZnO2) n.nH2O. (W is Na, Ca, Ba, Sr and Z = Si + Al) composition is similar to that of feldspar or quartz, but feldspar is composed of quartz SiO2, part of Si in the three- , Whereas zeolite has a cleavage in its skeleton due to breakage of the correct conformation of this network. By this gap, zeolite can adsorb a large amount of water at the same time while having a molecular sieve function. In addition, the zeolite has several characteristics according to the structural characteristics as follows.

1. Zeolite has a property of strongly adsorbing unsaturated hydrocarbons or polar substances by the action of cations in the crystal structure.

2. Has molecular sieve effect. Since zeolite has a constant pore size, it selectively adsorbs smaller molecules. Using this molecular sieve effect, separation of n-paraffin and isoparaffin or ortho, meta and para isomers can be separated.

3. It has ion exchangeability. Since zeolite contains exchangeable cations in the crystal structure, it readily exchanges freely with other cations. By using this property, it is possible to remove harmful substances, to concentrate and recover useful components. Recently, substitution of a part of cations constituting zeolite with anion has been used as a quality preservative or a preservative for foods since it has antibacterial properties.

The zeolite is preferably formed to a size of 0.01 to 0.5 mm. In this case, when the thickness is less than 0.01 mm, the antibacterial performance is deteriorated. When the thickness exceeds 0.5 mm, the waterproof sheet is affected.

The phytoncide oil is an antibacterial substance that the plant exerts to protect itself, and refers to all the antimicrobial substances emitted by plants, not to mention specific ingredients. Such phytoncide oil plays a role in suppressing bacteria but is beneficial to human body as a natural substance. It is known to contain a lot of phytoncide, such as cottonwood and pine.

The phytoncide oil is obtained by mass-extracting plants such as pine trees by high temperature distillation, and steam extraction is used. The reason for using the steam extraction method is that most of the essential oil does not dissolve in water and therefore the aroma component is not changed by the heat of the steam. Therefore, the total pressure of the mutually insoluble mixture steam is equal to the sum of the vapor pressures of the respective pure components, And the vapor pressure of water equals the pressure in the distillation tank, the essential oil boils out together with the water vapor. In this case, it is possible to flow out at a much lower temperature than the boiling point (150 ~ 350 ℃) of the essential oil component, so there is no fear of decomposition or deterioration of the component.

That is, the steam extraction method removes foreign matters such as dust and contaminants through washing the pine trees and plants. Plants can be cut or ground as needed. When the foreign substance is removed, it is charged into the distillation tank and heated to obtain the essential oil, and the essential oil is filtered to remove the impurities. And the phytoncide oil can be obtained by multi-stage distillation of the essential oil from which impurities have been removed.

Of course, the present invention is not limited thereto, and phytoncide oil commercially available on the market may be used.

A method of waterproofing the water tank using the waterproof sheet constructed as described above will be described below.

As shown in Fig. 1, the waterproofing method using the waterproof sheet of the first embodiment is characterized in that it comprises a step S1 of removing foreign matter on the water surface of the water surface, a step S2 of providing a fixing member, (S4) of fixing the fixing member to the water tub surface, and a step (S5) of thermally fusing the fixing member and the waterproof sheet.

The step (S1) of removing foreign matters on the water surface is a step of removing foreign matter adsorbed on the inner wall or the laitance generated during the process of generating the inner wall of the water tank to be waterproofed.

In this case, the primer can be applied to the surface to a certain thickness so that a firm fixing force of the fixing member can be exerted on the inner wall of the water tank from which the foreign substance is removed. Of course, it is optional in some cases.

The step S2 including the fixing member is a step of manufacturing a fixing member having a predetermined thickness by injection molding with a synthetic resin material.

As shown in FIG. 2, the fixing member 20 is formed with a predetermined interval on one surface thereof, and has an engagement fixing groove 22 (see FIG. 2) in which a space having a predetermined depth is formed so as to enlarge the contact area with the adhesive for concrete, ).

The engaging and fixing groove 22 includes a first groove 22a having a predetermined depth and a predetermined depth on one surface of the fixing member 20 and a second groove 22a communicating with the first groove 22a, And a second groove (22b) formed to have a width greater than the width to prevent any deviation after the adhesive for concrete entering the inside is cured to improve the fixing force.

In addition, the bottom surface of the second groove 22b includes a large number of concavities and convexities 24 for enlarging the contact area with the adhesive for concrete.

In this case, the engaging and fixing groove 22 preferably has a "T" groove shape. Of course, the present invention is not limited thereto, and it is possible to use any shape or shape that can enlarge the contact area with the adhesive for concrete and maintain the fixed state after the adhesive for concrete is cured.

Further, the engaging and fixing grooves 22 are formed to cross each other on one side of the fixing member 20, thereby enlarging the contact area with the adhesive for concrete.

Of course, the present invention is not limited to this, and it is also possible to use a fixing member proposed by the present applicant's pre-registered patent No. 10-927399 (hereinafter referred to as "pre-registered patent"). That is, the fixing member proposed in the prior-art patent has a problem in that the adhesive fixing force to the adhesive for concrete is somewhat weak since the adhesive fixing groove is formed only in one direction on one surface of the fixing member. In the present invention, .

As shown in FIG. 3, a high frequency induction plate 30 is formed on the inner side of the other surface of the fixing member 20.

The high-frequency induction plate 30 can be used as long as it is a conductive material such as a metal which can be heated by inducing a high-frequency induction current outputted from a high-frequency fusion welding machine, and is resistant to corrosion. It is preferable that the high frequency induction plate 30 is kept in parallel with the fixing member 20 and the thickness of the fixing member 20 is set in the range of 0.5 to 2 mm from the other surface.

In this case, it is preferable that the high frequency induction plate 30 is integrated into the fixing member 20 by an insert injection method when the fixing member 20 is manufactured by the injection molding method. Of course, the present invention is not limited to this, and any manufacturing method can be used as long as it can stably be embedded in the other surface of the fixing member 20. Alternatively, the high frequency induction plate 30 may be partially exposed on the outer surface of the other surface of the fixing member 20. [

Meanwhile, the high frequency induction plate 30 is formed with a plurality of through holes so as to maintain a stable state in the fixing member 20. It is also possible to use a high-frequency induction plate as disclosed in the prior patent. In addition, since the embedding thickness of the high frequency induction plate 30 is also described in detail, the detailed description is omitted here.

The step (S3) of applying the adhesive for concrete to the fixing member is a step of applying a certain amount of adhesive for concrete to the one surface of the fixing member.

4, the adhesive for concrete is applied to one surface of the fixing member 20, and the first and second grooves 22a (22a) of the coupling fixing groove 22 formed on one surface of the fixing member 20 ) 22b so as to be sufficiently filled. The adhesive for concrete is preferably an adhesive having high adhesion and excellent durability after curing. For example, a mortar adhesive or stone made by blending an ethylene-vinyl acetate polymer emulsion and an acrylic polymer emulsion with a special additive Use an epoxy adhesive.

In the step S4 of fixing the fixing member to the water tub surface, the adhesive agent for concrete applied to one surface of the fixing member is adhered to the inner wall of the water tub surface to fix the fixing member to the water tub surface.

This is because the adhesive for concrete applied to one surface of the fixing member 20 is adhered to the surface of the water tank and is cured for a predetermined time, so that the fixing member 20 is kept fixed to the surface of the water tank.

In this case, the adhesive for concrete is filled in the first and second grooves 22a and 22b formed in the coupling fixing groove 22 of the fixing member 20. Particularly, The fixing member 20 is firmly fixed on the surface of the water tank by the adhesive for concrete as the area of contact with the cured adhesive for concrete is further enlarged .

In this case, an insertion groove having a predetermined depth is formed on the surface of the water tank to which the fixing member 20 is attached so that the distance between the water tank surface and the fixing member 20 is narrowed by the insertion depth of the insertion groove. For example, So that the bending that is formed on the water tank surface by the difference in fixing force and spacing of the waterproof sheet on the water tank surface is minimized.

In addition, by allowing the fixing member 20 to be positioned in the insertion groove, the flow generated in the fixing member 20 due to long-time use can be minimized, so that the fixing force of the fixing member 20 can be maintained on the surface of the water bath.

The step (S5) of thermally fusing the fixing member and the waterproof sheet is a step of fusing the waterproof sheet to a fixing member fixed to the water surface of the water tank by using a high frequency fusing device so that the waterproof sheet is firmly fixed on the surface of the water tank.

5A, after the waterproof sheet 10 is brought into close contact with the surface of the fixing member 20 fixed to the water tank surface, that is, the surface on which the high frequency wave guide plate 30 is placed, Frequency induction current from the high-frequency fusing device to the fixing member 20 from the outside of the fixing member 20 through the waterproof sheet 10 and the fixing member 20, The high frequency induction plate 30 is heated so that the buried thickness portion between the high frequency induction plate 30 and the waterproof sheet 10 is melted to form a melted portion, As shown in the figure, the waterproof sheet 10 is pressed toward the fixing member 20 so that the melted portion functions as an adhesive to heat-seal the fixing member 20 and the waterproof sheet 10.

In this case, the through holes formed in the high frequency induction plate 30 are intended to solve the problem that the adhesive force between the melted portion made of synthetic resin and the high frequency induction plate 30, which is a metal, is weak. 20 and the waterproof sheet 10 can be increased to enhance the adhesive strength.

Accordingly, the work of fixing the fixing member 20 to the surface of the water tank is made simpler and quicker than the fixing method using the fixed metal such as concrete nail, so that the concrete nail It is possible to prevent cracks, various defects due to leakage, and the like.

≪ Embodiment 2 >

The same reference numerals are used for the same components as those in the first embodiment, and a detailed description thereof will be omitted.

The waterproof sheet 10 of the second embodiment includes a first layer 110 and a second layer 120, as shown in Figs. 6 and 7.

The first layer 110 includes an antimicrobial agent as in the first embodiment, so that hygienic maintenance of water that is formed on the outer side of the water surface of the water surface to be desalinated is enabled.

The second layer 120 is positioned on the side of the water surface of the water tank so that the fixing member 20 is more firmly fixed.

The second layer 120 includes a high frequency inducing material having 1 to 10 parts by weight based on 100 parts by weight of the subject.

Preferably, the second layer 120 is formed of the same material as that of the first layer 110, so that the waterproof sheet 10 integrated with the second layer 120 is provided.

The high-frequency induction material is preferably a conductive metal. The second layer 120 of the waterproof sheet 10 is melted in response to a high frequency induction current generated in the high frequency welding machine so that the first layer 120 of the waterproof sheet 10 is melted together with the fixing member 20 through the high frequency welding machine, So that a more firm fixation force is exerted. In this case, the high frequency inducing material is carbon.

It is preferable that the first and second layers 110 and 120 of the waterproof sheet 10 have a thickness of 6 to 8: 2 to 4. In this case, if the thickness ratio of the first layer 110 is 6 or less, the waterproof performance can not be maintained. If it exceeds 8, the thickness ratio of the second layer 120 relatively decreases, If the thickness ratio of the layer 120 is less than 2, smooth high-frequency fusion bonding is difficult. If the thickness ratio of the layer 120 is more than 4, the thickness ratio of the first layer 110 relatively decreases, and the waterproof performance can not be maintained.

For example, in the process of manufacturing the waterproof sheet 10, first, a second layer 120 including a high-frequency induction material is formed, and then the first layer 120 including the antimicrobial agent 110 can be formed on the second layer 120 so that the first layer 110 does not interfere with the waterproof performance of the waterproof sheet 10 due to the unified structure of the same material, So that a firm fixing force with the fixing member 20 is exerted by the second layer 120.

The waterproof sheet having antibacterial performance and the waterproofing method using the waterproof sheet are only examples, and the present invention is not limited to the embodiments described above. It will be understood by those skilled in the art that various changes may be made without departing from the spirit of the invention.

10: waterproof sheet 20: fixing member
22: engaging fixing groove 22a: first groove
22b: second groove 24: concave / convex
30: high-frequency induction plate 110: first layer
120: Second layer

Claims (4)

1. A waterproof sheet which is applied to a water surface of a water tank to waterproof the surface of the water tank,
1 to 10 parts by weight based on 100 parts by weight of the waterproof sheet 10; and an antimicrobial agent for sanitizing fresh water in the water tank;
Wherein the antibacterial agent is composed of charcoal, zeolite and phytoncide oil in a weight ratio of 4: 6: 2 to 3: 2: 3;
The waterproof sheet (10) comprises a first layer (110) comprising an antimicrobial agent; And
A second layer (120) comprising a high frequency inducing material;
The first and second layers 110 and 120 are formed at a ratio of 6 to 8: 2 to 4;
The waterproof sheet 10 may be formed by forming a second layer 120 including a high frequency inducing material and then forming a first layer 110 including an antimicrobial agent on the second layer 120 before the second layer 120 is cured 120) so that they are integrated by the same member;
Wherein the waterproof sheet has antibacterial properties.
delete A water tank waterproofing method in which a waterproof sheet is applied to a water tank surface so as to waterproof the water tank surface,
A step (S1) of removing foreign matter on the surface of the water tank to remove foreign matter on the water tank surface;
A fastening member for forming a fastening member having a predetermined gap on one surface thereof and for forming a fixing member in which the fastening grooves are formed so as to cross each other to improve a coupling force with the adhesive for concrete and the high frequency induction plate is embedded in the other surface (S2);
The adhesive agent for concrete is filled in the engaging and fixing groove on one surface of the fixing member provided with the engaging and fixing groove of the fixing member provided through the fixing member and the adhesive for the concrete is applied to the fixing member (S3);
A step of forming an insertion groove having a predetermined depth in a portion of the water tank surface where the fixing member is positioned and applying the adhesive for concrete, (S4) fixing the fixing member to the water tub to improve the fixing force of the fixing member by minimizing the protrusion height of the fixing member and the flow of the fixing member on the water tub surface; And
(S4) of fixing the fixing member to the water tub surface, the waterproof sheet manufactured according to claim 1 is brought into close contact with the fixing member fixed on the water tub surface, and the second layer containing the high frequency induction substance is placed on the fixing member A fixing member for pressing the high frequency welding machine at a position where the fixing member is positioned so that the fixing member and the waterproof sheet are melted and firmly fixed by a high frequency induction current generated through the high frequency welding machine, (S5);
The waterproof sheet 10 is characterized in that the antibacterial agent is a mixture of charcoal, zeolite, and phytoncide oil in a weight ratio of 4: 6: 2 to 3: 2: 3;
Wherein the waterproofing sheet has antibacterial properties. delete

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