Widely used in waterproofing membrane level, permanent waterproofing basements, subways, dams, water, tunnels and steel level, large supermarkets and large plant asphalt impregnated polymer type or class of waterproof material on the carcass, made into waterproof material products to the web form, called a waterproofing membrane. Depending on the composition of the material is mainly divided into bitumen membrane, polymer modified bitumen membrane and synthetic waterproofing; depending on the carcass into no carcass sheet, paper fetal membranes, glass fiber fetal membranes, glass cloth and polyethylene fetal membrane fetal membrane. Waterproofing membrane requires good water resistance, stability to temperature changes (not flowing at high temperatures, no blistering, no confusion move; at low temperature embrittlement), certain mechanical strength, ductility and fracture resistance, to there is a certain flexibility and aging resistance. [1] waterproofing membrane is a rollable sheet of waterproof material. Variety is one of the important construction projects waterproof material. By brand waterproof membrane construction industry mainly Dike waterproof membrane, DuPont waterproofing membrane, Sicon waterproofing membrane, of which the first two senate GB Atlas. According to its main constituent materials can be divided into bitumen waterproofing waterproofing materials, and synthetic polymer modified waterproofing membrane waterproofing (SBC120 polyethylene fiber composite membrane) three categories. There are PVC, EVA, PE, ECB and other bitumen membrane waterproofing membrane at the base tire (such as paper, fabric) after dipping on the asphalt, and then spreading on the surface of powder or flake made of insulating material The rollable sheet of waterproof material. 1. The water resistance performance waterproofing membrane water resistance is under the action of water infiltration and water after being its performance is essentially the same, with no water permeability, commonly impermeability, water absorption under pressure, said the role of water and other indicators. 2. Temperature stability means the temperature stability at high temperatures is not flowing, non-foaming, non-slip performance at low temperature embrittlement, namely the ability to maintain the original performance at a certain temperature. Common heat resistance, heat resistance and other indicators, said. 3. mechanical strength, ductility and fracture resistance waterproof membrane which refers to withstand a certain load, stress or deformation under certain conditions without breaking performance. Common tension, tensile strength and elongation at break and other indicators, said. 4. Flexibility Flexibility refers to maintain flexibility and performance at low temperatures. It is easy to ensure that construction does not rattle very important. Common softness, flexibility at low temperature and other indicators, said. 5. atmospheric stability refers to the ability to resist atmospheric stability in the long term the combined effects of the sun, heat, ozone and other chemical etching medium erosion and other factors. Common aging resistance, heat aging retention of other indicators, said. Introduce an application, oil fetal asphalt felt paper (now ban the production and use). 2, asphalt felt glass cloth. 3, asphalt fiberglass tire linoleum. 4, aluminum foil surface linoleum. Modified bitumen membrane modified asphalt oxidation compared with traditional asphalt, which greatly expand the use of temperature range, coil made of soft, smooth, can be made 3--5mm thickness, can single-use, with a 15- -20 years of reliable waterproof effect. Can be divided into: 1, elastomer modified bitumen membrane (SBS membrane). 2, plastic modified bitumen waterproofing membrane (APP membrane). 3, self-adhesive polymer modified bitumen membrane (APF coil). 4, synthetic waterproofing 5, SBC polyethylene fiber waterproofing membrane elastomer modified bitumen membrane KSF-SBS This product is suitable for industrial and civil roof, basement, bathroom, etc. waterproof, as well as bridges, parking water courses, swimming pools, tunnels, reservoirs and other buildings. This product is easy to operate torch construction hot-melt method, safety, construction, high efficiency, all year round construction. Reflective foil surface coil cooling effect. This product is used by SBS modified asphalt and other flexibility, low temperature flexibility, suitable temperature difference and anti-deformation capacity in line with the good. Construction must be strictly in accordance with GB5027-2002 (Roof Engineering Quality Acceptance) and design requirements. Grassroots grassroots level should be a strength, not from the shell, loose, uneven, and sub-positions on the roof seam of dust and foreign matter must be removed. Grassroots require drying, moisture content of less than 8%. Generally without significant grassroots white water marks or a piece of linoleum 1m × 1m flat paving a clean flat surface layer 3-4h. Such as linoleum covering the surface of base colors are still not covered with the surrounding parts of the same, no watermark, the moisture content has to meet the requirements. Methods gun hot melt adhesive membrane surface melt bake. Whole stick with the primary coil can also be glued or strip sticking point, the area to the slope on the size of the minimum bonding, should be baked shale surface to melt and cover shale bitumen sheet, then bake its overlapping membrane. Should be with the baking, with compaction. Overlapping edges must have excess asphalt extrusion. Coil long side lap, full bonding method is not less than 70mm, and strip sticky sticky point is not less than 100mm; short side lap at full stick of not less than 100mm, empty shops, and bars sticky sticky point when no less than 150mm. Upper and lower coil should be staggered approach when using double-width 1/3 or 1/2, different joints. Yang angle in the roof, gutters, gullies, roof, lap and closed parts of the head node, does not allow the presence of wrinkles, hollowing, Alice, delamination and slip phenomenon. Can also be cold bonding method construction. Observe their own construction quality inspection after construction is completed. Do not wear spikes in operation. Construction materials such as is flammable, should pay attention to fire safety and fire fighting equipment should be available. Membrane should be erected storage is ventilated place, avoid the sun, or in contact with a heat source. Product Specifications Specifications (nominal thickness) mm 2 3 3 4 on the table material PE S AL PE SM AL PE SM AL PE SM AL area m / roll Nominal area of ??151 010 7.5 deviation ± 0.15 ± 0.10 ± 0.10 ± 0.10 minimum volume weight, kg / Volume 33 37.5 33 3,235,403,242,455,042 31.5 33 37.5 32 Thickness (mm) average of ≥ 2.0 3.0 3.2 3.0 4.0 4.2 4.0 4.0 4.2 4.0 Fixed System 1. mechanical fastening systems mechanically fixed waterproofing membrane roofing system points mechanical fastening systems for light steel roofing and concrete roofing mechanical fastening systems. System has excellent waterproof, ultra-light weight, the weather is small, easy maintenance, colorful appearance, environmental protection and other features. Simple structure, only the vapor barrier, insulation board, waterproofing membrane (complex backing) three levels, low system cost, wide versatility. 2. The adhesive fastening system adhesive waterproof membrane roofing system is divided into a fixed light steel roofing adhesive fastening systems and concrete roofing adhesive fastening system. The system uses high-molecular PVC with adhesive or glue a / TPO waterproof membrane as a roof covering layer. Excellent waterproof, ultra-light weight, good insulation properties, no cold bridges, not destroy the grass roots, easy maintenance, colorful appearance, environmental protection and other features. Simple structure, only the vapor barrier, insulation board, waterproofing membrane (complex self-adhesive) three levels. 3. Heavy shop empty shop air pressure system weights (loose laying ballast) fixed roof system with pebbles, concrete slab, brick and mortar, decking and support the weight of the web, in order to resist wind loads. Has a simple construction, fast, low system costs, protect the waterproof layer, waterproof layer delaying aging characteristics, widely used in car park roof, underground roof version, Exalted roofing. 4. Color membrane roofing system sloping roof system can be applied on concrete, light steel, wood substrate. System has excellent waterproof, ultra-light weight, quick construction, easy maintenance, colorful appearance, environmental protection and other features. Simple structure, only the insulation board, waterproofing membrane (complex backing) vapor barrier, three levels. Fixation can be mechanical, construction adhesive fixation. In summary above is mainly used for roofing and construction of underground works. Generally not recommended for multi-node, waterproof smaller occasions, toilet room bath. Overall, the economic analysis, the material index is superior to synthetic polymer waterproofing membrane polymer modified bitumen membrane, so the use of relatively long life, but a one-time project cost is relatively slightly higher. Guide policy in the Ministry of Construction issued construction "Eleventh Five-Year" to promote the application and the ban on the use of technology (the first) announcement, long fiber polyester felt, E-glass fiber mat child-SBS, APP modified bitumen waterproofing membrane (II type), EPDM (vulcanized) waterproofing membrane, PVC waterproofing membrane (II type), self-adhesive modified bitumen membrane type (including non-child-and polyester tire base), high density polyethylene film adhesive waterproofing membrane and pre-coated anti-stick technology, waterproof blanket application of technology promotion and application of the product is listed as (first); paper tires and tire compound bitumen membrane, polyethylene film thickness of 0.5 mm or less, such as polyethylene, polypropylene composite waterproofing membrane are classified as restricted applications; S PVC waterproofing membrane, using secondary heating composite molding process or the production of renewable raw materials such as polyethylene, polypropylene composite waterproofing Coil ban for housing construction waterproofing. 5 synthesis Editing 1. Synthesis refers to is a synthetic rubber, synthetic resin, or both as the base material blend, adding the right amount of chemical additives and fillers, processed by a certain process made rollable sheet waterproofing membrane. This web of high tensile strength, high tear strength, elongation at break, heat resistance, low temperature flexibility, corrosion resistance, anti-aging and can be cold construction and other superior performance. Can be divided into: 1, rubber waterproofing membrane. 2, the plastic waterproofing membrane system. 3, rubber and plastic blend waterproofing membrane system. Waterproofing membrane for waterproofing choose quality and durable life greatly influence the correct choice, the rational use of waterproofing membrane is one of the keys to the success of the design of roofing, waterproofing membrane of many kinds of different performance. 1. According to the characteristics of polymer modified bitumen membrane, and its construction methods are (A. B. hot-melt adhesive cold bonding method C. Law). 2. The water vapor permeability membrane Dike water vapor permeability membrane is a new type of polymer vapor permeability waterproof material. Speaking from the production process, the technical requirements Dike water vapor permeability of the membrane is generally higher than for the more waterproof material; at the same time from the quality point of view, Dike water vapor permeability membrane also has other waterproof materials do not have the functional characteristics. Dike water vapor permeability membrane in strengthening the building airtight, watertight, while its unique vapor permeability properties, enable the rapid discharge of water vapor inside the structure, to avoid structural breed mold, protect property values, and the perfect solution to moisture and UN health ; rapid discharge vapor to protect maintenance thermal performance, is a healthy and environmentally friendly new energy-saving materials. 6 Product edit SBC120 series of polymer composites reinforced waterproofing membrane (SBC120 series of waterproof material) is polyethylene, polypropylene non-woven fabrics, EVA, anti-aging agent polymer raw materials by physical and chemical change is made after processing of complex automated production lines. The structure is waterproof layer and the intermediate layer is a layer of anti-aging, the upper and lower sides of the adhesive layer is enhanced. The product is disposable multilayer polymer composite, its surface was irregular cross-mesh shape. Which is characterized by high tensile strength, high water impermeability, simple construction, is now the most promising and fastest growing new waterproof materials. Product Features 1.1 Product structural features polyethylene fiber composite waterproofing membrane with polyethylene resin-based waterproof layer, double-woven polypropylene filament surface recombination for the enhancement layer, hot melt process once direct pressure composite molding (low-end products are using secondary composite molding process). Main waterproof layer polyethylene film that good puncture resistance scale linear low polyethylene (LLDPE) resin processing, while adding accessories to improve the flexibility and adhesion of primary waterproofing membrane layer, adding a carbon black, antioxidant agent to improve the anti-aging waterproof membrane main layer. Surface enhancement layer using the new hot-rolled spunbond non-woven polypropylene filament, the main role is to: firstly, to increase the core (main waterproof layer) of the overall tensile strength, so that the relative reduction in the thickness of the core layer; the second is to increase the core of surface roughness, so the core play a protective role; three is to provide an adhesive mesh void structure. For composite membrane surface reinforcing layer nonwoven fabric structure, about 40% of the thickness of the impermeable layer of the polyethylene resin by hot melt adhesive, and ensure that the surface layer is firmly bonded to the impermeable layer; about 60% of the thickness of the coil body provided an adhesive layer and the construction of the adhesive layer, the adhesive with the impermeable layer to ensure sufficient adhesion, the waterproof structure tangential impermeable. 1.2 Product Features selection and structural characteristics of polyethylene fiber composite waterproofing membrane, it has strong permeability, high tensile strength, low temperature flexibility, linear expansion coefficient, easy adhesion, friction coefficient, good stability toxic, deformation adaptability, adapt to a wide temperature range, long life, good overall technical performance. Polyethylene, polypropylene (PP) are resistant to chemical stability, corrosion mildew, ozone resistance, and good mechanical properties of polypropylene. Completely isolated from the UV light conditions, polyethylene, polypropylene has proven life of more than 50 years. It should be noted that the polyethylene fiber composite waterproofing membrane discussed here refers to the main waterproof layer reaches a predetermined thickness, using a composite molding process, the quality assurance of regular production of the product. 1.3 Application Technical characteristics polyethylene fiber composite waterproofing membrane product application technology is a system waterproof technology, the integrated use of the advantages of material undertake waterproofing system decomposition function, and form a good stable overall performance waterproofing system. System waterproof structure: polyethylene fiber composite waterproofing membrane by a protective layer, an adhesive layer on the structure, the main membrane layer, an adhesive layer under the structure, primary components. That is the main coil layer polyethylene fiber composite waterproofing membrane, by the enhancement layer, impermeable layer, Enhanced layers. 1.3.1 Each section features: 1) the protective layer: bear against mechanical damage and UV irradiation, blocking water flow and other functions. Adhesive 2) layer: protective layer and the adhesive web to assume the body layer, and the function of blocking the leakage flow (constituted by a waterproof polymer-containing cement paste). 3) Coil body layer: commitment to prevent water penetration, structural adhesive layer functions to provide itself with preventing heat aging and ozone aging function. 4) Under the adhesive layer: bear coil body layer bonding with the grass roots, blocking the lateral flow of water leakage, make up the grassroots defective function (composed of polymer adhesive). 5) primary: commitment to provide carrier matrix functions (mainly composed of architectural concrete masonry isomer or isomers). 1.3.2 System waterproof structure characteristic structure of polyethylene fiber composite waterproofing membrane waterproofing system can be designed to meet the waterproofing waterproofing system requirements: 1) the structural stability: It is relying on membrane surface mesh structure with cement solidification structure directly stick together to achieve. 2) impermeability: This is to rely on a stable bonding interface structure and lateral membrane impermeable polyethylene core implementation. 3) resistance to atmospheric aging: this is to rely on polyethylene, polypropylene, good oxidation resistance, ozone capacity, and stability in combination with the web, completely blocked the ultraviolet light to achieve the cement structure. 4) mechanical protection: to rely on surface-enhanced layer and the stable performance of the cement material of the protective layer of commitment. 5) UV protection: borne by the cement material of the protective layer, coil construction completely isolated after UV. 6) Construction Feasibility: relying on membrane structure and surface-enhanced mesh gap cement solidification material layer provides direct bonding to achieve. Adhesive waterproofing membrane waterproofing system and the main structure of the building and paving as well as the protective layer using an adhesive cement material, therefore, good structural stability, does not extend decreases with time and does not require the construction of the main building of the low moisture content. 7) Environmental Feasibility: Non-toxic, non-polluting, the construction process does not pollute the environment. 8) waterproof layer accidental injury seepage arrest: polyethylene fiber composite waterproofing membrane products focus on the structure of the overall water use efficiency of the system, rather than on a separate body material waterproof membrane to prevent water penetration. Throughout the waterproofing system, the layers of the structure has played a role in blocking the leakage of water; when the web host material injury accidents, total seepage flow control body roll material leaks out of the water so that it does not form, so as to achieve the project waterproof overall effect. 1.3.3 splicing splicing technology polyethylene fiber composite waterproofing membrane coagulation using hot melt adhesive bonding and bonding of two ways, both with long-term physical and chemical stability. 1) coagulation coagulation adhesive bonding adhesive mainly refers to polyurethane adhesives, polymer modified cement paint. After solidification of the adhesive to dry, and the membrane surface bonded nonwoven riveting. Bonding mechanisms: linear low density polyethylene (main waterproof layer) composite nonwoven fabric surface roughness, the membrane surface to form a network void structure, so as to have adhesive properties. When the membrane surface in contact with non-woven adhesive liquid, non-woven fiber tangential arrangement of the adhesive is easy to immersion, non-woven adhesive mesh pore fluid immersion, a mechanical riveting effect, so that the coil and the coil or grass-roots firmly bonded together. 2) hot melt adhesive hot melt adhesive mainly refers to the hot wedge welding method, bonding better. Bonding mechanism: polyethylene resin hot melt, revealing polypropylene and polypropylene under pressure or fusion bonding, reliable bond strength, up to 40N / cm. 1.3.4 Project application advantages polyethylene fiber composite waterproofing membrane has some unique advantages in the project: 1) to solve most of the organic material and the cement waterproofing membrane can be laid directly bonded problem; 2) did most of the organic waterproof Coil Products grassroots building construction requirements of low moisture content (<9%) limitations; 3) solves the main organic products waterproofing membrane waterproofing material exposed using vulnerable to injury, the problem of aging; 4) no fire some waterproof membrane construction problems and environmental pollution; 5) waterproofing system to get rid of relying solely bear all waterproof material waterproof method to reduce the consumption of organic material and engineering costs, improve the waterproof effect. System supporting material polyethylene fiber composite waterproofing membrane waterproofing system according to the design requirements of the project waterproof construction, require appropriate supporting materials, including supporting the adhesive, thermal softening equipment, book-type materials. 2.1 Construction adhesive bonding polyethylene fiber composite waterproofing membrane waterproof bonding characteristics with the system structure determines the choice of adhesive material. Polyurethane adhesive can be used as a membrane seams, the main choice of specially formulated for waterproofing membrane without swelling action of polyether-based polyurethane adhesives or asphalt, to ensure the web is not deformed. Roll up and down the adhesive layer may be non-re-insoluble polymer modified cement adhesive materials, namely cement paste by adding special plastic material. Such material has a more appropriate tack, better water retention, re-soluble and non-water blocking swelling. Polymer adhesives are water swelling effect, blocking water infiltration, maintain workability cement paste, keep moisture in order to facilitate the adhesive layer of cement hydration solidification. Under the structure of the adhesive layer can be used cement paste material, it can be more than 9% of primary construction in progress receive moisture. Of course, when the moisture content is high, you should avoid the escape of water evaporation to form hollowing. The same structure can be used on the adhesive layer of cement material factors, it can be directly painted on the surface of the construction waterproofing membrane, followed by a protective layer construction. 2.2 fused polyethylene fiber composite waterproofing membrane hot melt adhesive construction, should ensure that the melting polyethylene film bonded construction. The main construction equipment with dual wedge automatic crawling gun, hot air gun, press-gun and so on. Softness polyethylene fiber composite waterproofing membrane according to their specifications are quite different. Relatively thin membrane supple, easy construction laying, thicker membrane relatively stiff, before laying need to adopt complementary thermal softening equipment (hot air, heat radiation), so that the web to soften, smooth, and grassroots adapt. Wherein the hot air suitable for large curvature knuckle portion, heat radiation suitable for small curvature of the annular portion. Complicated parts of laying requires the use of temporary adhesive fixing method, can be applied to matching the target material and the speed glue fixation. There are other tools supporting construction scraper, mixing equipment, container glue, scissors, cutting knives, cleaning tools, weighing tools, putty knife, brush and so on. Product Applications polyethylene fiber composite waterproofing membrane characteristics of the product itself, both in the cold northeast, northwest application can also be used in hot and humid south. Polyethylene fiber composite waterproofing membrane technology products have wide application areas: roofing, underground, indoors, subway, carrying countertops, hangars, warehousing, reservoirs and other projects, can be used. With the special properties of the products of research and development of such materials is to enter the broader field of application. For example, research by the product under alternating load capacity of the composite membrane will be applied in the road bridge waterproofing works; by the negative pressure release properties of the product research, the composite membrane will be available in the underground waterproof projects applications. Polyethylene fiber composite waterproofing membrane waterproofing system in roofing projects, the main design on the grassroots level; in underground waterproof projects, primarily designed to meet the water side of the grass-roots; indoor moisture engineering applications designed primarily at the grassroots level and ornaments between the surface layer; application of the bearing surface water project, designed primarily between the base and the bearing surface; in underground masonry waterproofing liner between the main design of the outer lining and lining; application of waterproofing works in cave The main design, including the lining-lateral; sloping tile roof waterproofing applications, the main design between the base and the tile lining. Self-adhesive rubber asphalt waterproofing membrane self-adhesive rubber asphalt waterproofing membrane is a polymer resin, high-quality asphalt as the base material, polyethylene film, aluminum foil as the surface material, the use of isolation from the sticky layer of self-adhesive waterproof membrane. The product is no cure polyester tire tread base of two. Product has strong adhesive properties and self-healing, high and low temperature environment to adapt to the construction. Product Features 1, no binders, no need to heat baked until melted, just torn isolation layer can be securely bonded to the substrate. To facilitate the construction and construction fast. 2, elastic, rubber has excellent elongation, deformation and cracking well adapted to the grassroots level. 3, has excellent adhesion to the grassroots, often greater than the shear adhesion force (outer adhesive surface rupture), ensuring reliable lap tight, flawless. 4, very unique "self-healing function" can heal on their own small puncture damage, in the event of a puncture or a hard object embedding, and these objects are automatically combined into one, to maintain good water resistance. 5, in addition to the host material, the surface material of polyethylene film also has excellent water resistance and high strength (i.e. only of the polyethylene fiber membrane waterproof membrane), thus having a double insurance waterproof property. 6, corrosion resistance: The membrane has good acid and alkali resistance, chemical resistance, excellent anti-aging properties in a variety of environments. Product range of applications for industrial and civil buildings roof, basement, interior, public works and reservoirs, swimming pool and underground tunnel waterproofing. Also applies to the wood structure and metal structure roof waterproofing. Particularly useful for the construction of military facilities and cold should not use open flame of the oil depots, chemical plants, textile mills, grain storage and other re-waterproofing. For the roof garden can also play a puncture-resistant root function. Also applies to the construction of the highway waterproof grassroots. The country to promote the product. 7 construction requires editing paving primary waterproofing membrane surface (screed) must be clean and moist watering the basic level (Note: leveling layer of roofing shall comply with GB50207-94 "roof engineering and technical specifications" provides underground waterproof screed shall comply with GBJ208-83 "underground waterproof construction and acceptance" provisions). Heavy cement glue containing polyvinyl alcohol was prepared by 10% -15% of the cement paste adhesive, mixing must be uniform, no precipitation, no clots, no segregation phenomenon can be used. Before construction, the roof should be the main focus of the drainage and waterproofing the detail section of the complex structure be sealed and the same membrane material and the main waterproof layer membrane additional layer to use. Polyether polyurethane sealing materials used such as the use of other sealing materials should not contain mineral oil, petroleum jelly and other chemicals that affect performance polyethylene products. The corner shop should add an additional layer; yin and yang angle, etc. are made of R = 20mm rounded. Waterproofing membrane should be paved paving method, brushing adhesive surface at the grassroots level should be uniform, not open at the end, do not accumulate; after brushing should immediately Stones roll adhesive to prevent prolonged affect the bond quality. Paving waterproofing membrane shall not wrinkled, not force stretched membrane, while paving the following roll edge exclude air and excess adhesive and ensure the surface with the primary coil and the bonding between the layers dense membrane. Paving waterproofing membrane lap width of not less than 100mm. Two floors and the adjacent two membrane joints should be staggered third magnitude. [3] 8 how to choose one, pay attention to the product name and logo by product packaging standards, should be marked on the product packaging, company name, product marking, production date or batch number, license number, storage and transport considerations for product labeling should be strictly in accordance with the standards, consistent with the product name, never vague or incomplete labeling and no production mark. Users in the selection of these products, we must note the product labeling, identify the product name, because the mark represents the identity of the product. Example: The polyester non-woven - mesh composite membrane tire production, only the title compound tires for asphalt composite fetal flexible waterproofing membrane or membrane, but not the title SBS membrane, and its products are labeled only marked by complex tire standards. Second, from the base to identify fetal membranes from the general quality of the product visually section, specific methods can buy the product by hand tear, exposing the observation section of child-fiber, composite tires after tearing the section Mesh reinforcement is exposed, then you can conclude that the product must be reinforced waterproofing membrane, is what kind of complex physical testing requires the use of fetal membrane - soluble content test to observe the bare rear tire base. And pure polyester tire, only polyester or fiberglass fibers fiberglass tire coil section after tearing exposed. Third, from the physical properties of strict quality customs can only be distinguished from the visual appearance of the fetal membrane complex, but failed to resolve the selected product meets the quality requirements, which requires the user to have the test capability and technology institutions, according to the corresponding product standards were soluble content including factory project physical performance test, using soluble content project to control the amount of asphalt and modifier product contains, but also to reveal the true face of the tread base of the product being used, can be determined Are consistent with the product labeling. Fourth, the product price comparison waterproofing membrane product competition, rampant fakes to produce market, the largest amount of SBS modified bitumen membrane, for example, the best corporate profits but also over 15%. Appearing on the market numerous ultra-cheap SBS modified bitumen membrane, which rarely SBS content, even without SBS, with crumb rubber instead. So pay attention to when choosing to avoid the selection was significantly lower than the market price of the product.