Stamisol Extreme DW Roof

High-performance roof underlay for roofs ≥ 5°, including in extreme climates

Make reliability the standard with Stamisol Extreme DW, a roof underlay membrane designed for roofs with a slope ≥ 5%, ideal for mountain climates or low-slope roofs. Tested for over 30 years and recognized for its effectiveness as a “temporary roof,” it provides watertight protection (W1), high vapor permeability, and outstanding UV resistance (up to 10,000 hours).

Lightweight and easy to install, it includes integrated adhesive strips for fast and secure sealing of overlaps. Made from robust, thermally stable materials from –40°C to +80°C, this system allows an extended construction phase (24 months), even in extreme conditions.

Robustness, durability, certified performance

Stamisol Extreme DW stands out for its exceptional mechanical strength (R3) — initial tensile strength of 520/470 N/5 cm and maintaining ≥ 95% of its strength after 10,000 hours of UV exposure.

Its Sd value ≤ 0.06 m ensures efficient vapor release, while its resistance to wind-driven rain has been confirmed according to EN 1928 and TU Berlin testing. It comfortably supports a 24-month construction phase thanks to its cold flexibility (–30°C) and compatibility with all types of insulation and substrates (timber, metal, sarking).

High standards, safety, proven durability

Choose peace of mind with a membrane proven in high-mountain and extreme conditions.
Its WUFI certification, 10-year warranty (optional 20 years in Switzerland), and robustness certified under ISO 9001/14001 make it a trusted solution for demanding projects—from ventilated roofs to sarking systems.

Complete system & guaranteed compliance

Complete your roof system with Stamisol accessories (adhesive tapes, nail seals, molded parts) for perfect watertight detailing.
Also discover Stamisol Extreme Pack 500 for prefabricated roof solutions and hot-air weldable membranes, or Stamisol Advanced Eco as the best balance between breathability and budget constraints.

Euroclass E / VKF 5.2, SIA 232-1, eco-bau Eco 1 certifications and WUFI evaluation guarantee performance, robustness, and durability.