10/07/2026
Waterproofing is one of the key factors directly affecting the durability and service life of buildings. Especially in regions with harsh winter conditions, it is not enough for a waterproofing material to only prevent water penetration; maintaining flexibility at low temperatures is also critically important.
The 3 mm –20°C SBS modified bituminous membrane provides an effective solution in challenging climatic conditions thanks to its ability to maintain its elastic structure down to –20°C, strong mechanical resistance, and long-term performance.
What is a 3 mm –20°C SBS Modified Bituminous Membrane?
This product is a bitumen-based waterproofing membrane modified with Styrene-Butadiene-Styrene (SBS). The SBS additive prevents the material from hardening at low temperatures and helps maintain its flexibility. Thanks to its –20°C cold flexibility rating, the risk of cracking is minimized in extremely cold regions.
The 3 mm thickness provides sufficient resistance against punctures and tears while offering a balanced structure between flexibility and lightweight performance.
Technical Specifications
Thickness: 3 mm
Cold Flexibility: –20°C
Modification Type: SBS (Styrene-Butadiene-Styrene)
Reinforcement Layer: Polyester felt (high tensile strength)
Top Surface: Polyethylene film, sand coating, or mineral coating
Application Method: Torch-applied installation
Applications
Cold Climate Regions: Areas requiring resistance down to –20°C.
Roofs and Terraces: Provides reliable performance in regions exposed to heavy snow loads.
Bridges and Viaducts: Helps reduce the risk of cracking on moving surfaces.
Industrial Buildings: Suitable for large-scale projects requiring high durability.
Prefabricated Buildings: Provides advantages with fast installation and flexibility.
Advantages
Cold Weather Resistance: Maintains flexibility down to –20°C.
Mechanical Strength: The 3 mm thickness provides protection against punctures and tears.
Long Service Life: Provides performance for up to 15 years with proper installation.
Wide Application Range: Can be used in various areas such as roofs, terraces, bridges, and viaducts.
Easy Installation: Allows safe and efficient installation even under cold weather conditions.
Application Recommendations
Surface Preparation: The application surface must be clean, dry, and smooth.
Primer Application: The use of bituminous primer improves adhesion performance.
Overlap Details: Minimum 10 cm overlap should be applied at joints.
Protective Layer: For exposed applications, mineral-coated products should be preferred. Under protective concrete layers, sand-coated products should be used.
Frequently Asked Questions (FAQ)
In which regions is the 3 mm –20°C SBS modified membrane preferred?
It is used in regions with harsh winter conditions such as Eastern Anatolia, colder areas of Central Anatolia, and high-altitude locations.
What is the difference compared to APP modified products?
SBS modified membranes provide higher flexibility at low temperatures and reduce the risk of cracking in cold climates.
Can it be used for foundation waterproofing?
Yes, it can be used; however, for heavy soil conditions, membranes with a thickness of 4 mm or more are generally recommended.
What is the average service life?
With proper installation and suitable protection, it can provide reliable performance for approximately 12–15 years.
