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About usJianguo Waterproofing (Jianguo Weiye) was founded in 1989. It is a professional waterproofing enterprise integrating scientific research, production, sales, construction, and technical services.
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BlogJianguo Waterproofing (Jianguo Weiye) was founded in 1989. It is a professional waterproofing enterprise integrating scientific research, production, sales, construction, and technical services.
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Contact UsJianguo Waterproofing (Jianguo Weiye) was founded in 1989. It is a professional waterproofing enterprise integrating scientific research, production, sales, construction, and technical services.
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WJG-830 single-layer waterproof membrane roof waterproofing system
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Single-ply waterproof membrane roofing systems, in contrast to layered and multi-layer systems, utilize a single-layer flexible waterproof membrane. They typically include structural layers, vapor barriers, insulation layers, and waterproof layers. These layers are combined sequentially using methods such as mechanical fastening, full adhesion, or loose laying.
Structural layers include traditional concrete, steel, or wood structures; vapor barriers include polyethylene (PE) film and aluminum foil; insulation layers include rock wool, XPS, EPS, or polyisocyanurate (Polyiso) boards; and waterproof layers include thermoplastic PVC, TPO membranes, and some high-performance modified bitumen membranes.
Single-ply flexible roofing systems are characterized by their light weight, good waterproof and insulation performance, quick installation, easy maintenance, long lifespan, and superior long-term cost-effectiveness. In steel structures, they effectively solve problems such as water leakage, cold bridges, condensation, noise, and complex curved surfaces in traditional roofing systems.
They are widely used in projects such as stadiums, exhibition halls, airports, industrial plants, logistics centers, shopping malls, hospitals, and train stations.
System Classification
◆ Ballast System
The membrane is loosely laid on the substrate. Rough substrates require a suitable protective layer. Adjacent membranes overlap by at least 80mm, and the overlaps are hot-air welded to create a continuous, seamless waterproof layer. The roof perimeter and penetrations are treated with special flashing materials. Round, smooth, or polished pebbles or concrete blocks (minimum 50mm thick) are used as ballast to secure the membrane.
Its features include quick installation, low installation costs, high fire rating, and excellent weather resistance, suitable for various substrates.
◆ Mechanical Fastening System
The membrane is loosely laid on the substrate. Screws and strips or washers are used to mechanically fasten the membrane at the overlaps. Adjacent membranes overlap by at least 120mm at the long edges and at least 80mm at the short edges. The seams are hot-air welded to form a continuous, seamless waterproof layer. The roof perimeter and penetrations are treated with special flashing materials.
Its features include strong wind load resistance, low system cost, and light weight, suitable for roof structures that cannot withstand ballast loads but can be mechanically fastened.
◆ Fully Adhered System
The membrane is fully adhered to the substrate using adhesive. Adjacent membranes overlap by at least 80mm, and the overlaps are hot-air welded to create a continuous, seamless waterproof layer. The roof perimeter and penetrations are treated with special flashing materials.
Its features include light weight, strong wind load resistance, and aesthetics. It is suitable for low-slope roofs, irregularly shaped roofs, and roofs with limited load-bearing capacity. It can also be used for complex structures, but substrate compatibility with the adhesive must be ensured.
System Components
◆ Vapor Barrier: When using polyethylene or polypropylene film, the thickness should not be less than 0.3mm.
◆ Thermal Insulation Material: Rigid polystyrene foam, rigid polyurethane foam, rigid polyisocyanurate foam, rigid phenolic foam, and rock wool insulation boards can be used. They should comply with relevant building thermal design codes, fire design codes, and relevant current national standards.
◆ Waterproof Membrane: Mainly includes polyvinyl chloride (PVC) waterproof membrane, thermoplastic polyolefin (TPO) waterproof membrane, elastomer (SBS) modified bitumen waterproof membrane, and plasticizer (APP) modified bitumen waterproof membrane.
The main performance of polyvinyl chloride (PVC) waterproof membrane should meet the requirements of the standard GB12952-2011.
The main performance of thermoplastic polyolefin (TPO) waterproof membrane should meet the requirements of the standard GB27789-2011.
The main performance of elastomer (SBS) modified bitumen waterproof membrane should meet the requirements of the standard GB18242-2008.
The main performance of plasticizer (APP) modified bitumen waterproof membrane should meet the requirements of the standard GB18243-2008.
The thickness and overlap width of the single-ply waterproof membrane should comply with the provisions in Tables 1 and 2:
Table 1 Thickness of Single-Ply Waterproof Membrane (mm)
Waterproof Membrane Name
Grade 1 Waterproof Thickness
Grade 2 Waterproof Thickness
Polymer Waterproof Membrane
≥1.5
≥1.2
Elastomer, Plasticizer Modified Bitumen Waterproof Membrane
≥5
Table 2 Overlap Width of Single-Ply Waterproof Membrane (mm)
Waterproof Membrane Name
Longitudinal and Transverse Overlap Method
Full Adhesion Method
Mechanical Fastening Method
Hot Air Welding
Overlap Tape
Uncovered Mechanical Fastening
Washer
Covered Mechanical Fastening
Washer
Uncovered Mechanical Fastening
Washer
Covered Mechanical Fastening
Washer
Polymer Waterproof Membrane
≥80
≥80
And Effective Weld Width
≥25
≥120
And Effective Weld Width
≥25
≥120
And Effective Adhesion Width
≥75
≥200
And Effective Adhesion Width
≥150
Elastomer, Plasticizer
Modified Bitumen Waterproof Membrane
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≥80
And Effective Weld Width
≥40
≥120
And Effective Weld Width
≥40
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◆ Mechanical fasteners: including fixing nails, washers, sleeves and pressure strips.
◆ Adhesive materials:
The base adhesive and lap adhesive for polymer waterproof membrane should meet the requirements of the standard for Polymer Waterproof Membrane Adhesives (JC/T863-2011).
The adhesive for asphalt-based waterproof membrane should meet the requirements of the standard for Base Course Treatment Agent for Asphalt Waterproof Membrane (JC/T1069-2008).
The adhesive material used for the lap joint of the vapor barrier should meet the requirements of the standard for Butyl Rubber Waterproof Sealing Adhesive Tape (JC/T942-2004).
◆ Coping materials: mainly include block materials made of cement mortar, fine stone concrete, etc., and pebbles, etc.
◆ Flexible isolation materials: It is recommended to use polyester non-woven fabric or polypropylene non-woven fabric with a unit area mass of not less than 120g/㎡
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