Polyurethane is a base material technology for liquid membranes and at the same time it is a key competence of Sika for many years. Developments and know-how, modern production facilities, wide product range and extensive experience allows Sika to be a solid world market leader for polyurethanes in variety of application fields.
Advantages of Sika PU Waterproofing Membrane
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Liquid applied |
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Versatile |
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| Highly elastic, retains flexibility even at low temperatures |
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Seamless |
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Zero flame technology |
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| Fully adhered to the substrate |
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| High UV resistance |
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| Vapor permeable |
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| Variety of color options |
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| High solar reflectance index when applied in white color |
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One-Component Polyurethane
One-component polyurethane based liquid applied membranes and roof coatings were invented in 1960s and represent an indispensable technology in today’s roofing industry. Due to their high mechanical properties and flexibility, particularly at lower temperatures, as well their capability to cure under a wide range of conditions, polyurethane based liquid applied membranes can also be used in climatically challenging environments.
| FEATURES | ADVANTAGES | BENEFITS |
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Fast curing |
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| UV stable and resistant to yellowing |
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| One-component |
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| Convenient packaging in tins |
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Technology
MTC Technology
Sika’s Moisture Triggered Chemistry (MTC) systems incorporate a unique technology that allows the material to use atmospheric moisture to trigger the curing process. This means the waterproofing membranes are capable of curing in a wide range of conditions including extreme temperature ranges and humidity variations. Unlike traditional polyurethane systems they do not release CO2 , which often causes gassing, and application is not delayed by adverse weather conditions.
i-Cure Technology
Sika’s i-CURE based liquid applied membranes represent the new generation polyurethane liquid applied membrane technology. Featuring a reduced solvent content and a new Sika patented i-Cure hardener for lower odor development during and after the curing process, this technology has overall reduced odor emission and makes the products suitable for sensitive projects such as hospitals, schools, food and pharma industries, etc..
Products
Two-component Polyurethane / Polyurea
The demand for two-component polyurethane/polyurea (PU/PUA) based liquid applied membranes has risen in the last decade.
The fast and efficient application method by two-component spray machines makes it particularly suitable for large surface application and industrial application. Once the product is mixed in front of the application nozzle and applied to the surface it cures within seconds, allowing a fast over coating or early pedestrian traffic.
Sika has adapted the two-component PU/PUA hybrid technology to cold applications and hand-applied systems, making it now possible to do installations where hot spray is not efficient, while maintaining the same performance characteristics.
| FEATURES | ADVANTAGES | BENEFITS |
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| Very fast curing |
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| Fast application especially for large area |
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| Solvent free and 100% solids |
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Technology
Two-component Hot Spray Technology
Sika’s two-component hot spray applied roofing membranes are based on polyurethane/polyurea hybrid, and combine the high mechanical strength and abrasion resistance of a polyurea with the flexibility and low modulus of elasticity of a polyurethane, making the systems ideal for roof waterproofing, were a durable and flexible membrane is required.
Sika’s two-component hot spray applied roofing membranes are solvent free with solid content of 100%, resulting in efficient consumption rates without any material loss due to evaporation of water or solvents. Combined with its fast application method with two-component spray equipment this type of technology is very efficient and economic, particularly for large surface applications. In addition the fast curing of this technology allows pedestrian traffic and the application of a UV protective top coat on exposed roofs after a few minutes and makes it ideal for projects where a fast progress is important.
Products
Applicable Substrates for PU Waterproofing Membrane
Bitumen
Metal
Concrete
Bricks and stones
Roof tiles
Copper
Wood
Fiber cement
PU Waterproofing Membrane Application Area
Cool roof
Exposed Roof
Green Roof
Refurbishment of old roof
Easy Detailing with PU Waterproofing
