10/07/2026
Waterproofing is a key factor that directly affects the durability and service life of buildings. Especially in areas continuously exposed to water such as foundations, roofs, terraces, and bridges, choosing the right product ensures reliable performance for many years.
The 4 mm –20°C SBS modified bituminous membrane provides an effective solution for both harsh climatic conditions and heavy-duty projects thanks to its strong structure, high mechanical resistance, and ability to maintain flexibility at low temperatures.
What is a 4 mm –20°C SBS Modified Bituminous Membrane?
This membrane is manufactured from bitumen modified with Styrene-Butadiene-Styrene (SBS). The SBS additive reduces the risk of cracking at low temperatures and helps the material maintain its flexibility. Its –20°C cold flexibility rating allows safe use under severe winter conditions.
The 4 mm thickness provides additional resistance against punctures and tears, delivering long-lasting performance on surfaces exposed to heavy loads.
Technical Specifications
Thickness: 4 mm
Cold Flexibility: –20°C
Modification Type: SBS (Styrene-Butadiene-Styrene)
Reinforcement Layer: Polyester felt (high tensile and tear resistance)
Top Surface: Polyethylene film, sand coating, or mineral coating
Application Method: Torch-applied installation
Applications
Foundation Waterproofing: Provides durable protection against groundwater and soil pressure.
Roofs and Terraces: Offers reliable waterproofing performance in cold weather conditions.
Bridges and Viaducts: Helps reduce the risk of cracks on moving surfaces.
Parking Roofs: Preferred in areas requiring high mechanical resistance.
Industrial Buildings: Suitable for professional applications on large surface areas.
Advantages
High Mechanical Resistance: The 4 mm thickness provides strong protection against punctures and tears.
Cold Weather Resistance: Maintains flexibility down to –20°C.
Wide Application Range: Provides reliable use in both foundation and roof applications.
Long Service Life: Provides durability for up to 15 years with proper installation.
Professional Performance: Offers a reliable solution under challenging climate and site conditions.
Application Recommendations
Surface Preparation: The application surface must be clean, dry, and smooth.
Primer Application: The use of bituminous primer improves adhesion strength.
Overlap Details: Minimum 10 cm overlap should be applied at joints.
Protection Layer: For foundation applications, protective concrete or drainage boards should be preferred.
Frequently Asked Questions (FAQ)
Where is the 4 mm –20°C SBS modified bituminous membrane used?
It is applied in water-exposed areas such as foundations, roofs, terraces, bridges, viaducts, and parking roof systems.
What does –20°C cold flexibility mean?
It means the membrane can maintain its elastic structure without cracking down to temperatures of –20°C.
Why is 4 mm thickness preferred for foundation waterproofing?
A thicker membrane provides higher resistance against soil pressure and groundwater exposure.
What precautions should be taken for exposed applications?
Mineral-coated products should be selected, or a protective concrete layer should be applied over the membrane.
