Stamisol Extreme Pack 500

Breathable and waterproof roof membrane for pitches ≥ 5°

Boost on-site efficiency with Stamisol Extreme Pack 500: a roof underlay membrane available in rolls or even prefabricated according to your plans, combining W1 watertightness, breathability, and extreme resistance—even in mountain climates.
Custom-made, it is easily installed from the ridge, can be cold-welded from 5°C, and ensures immediate weatherproofing. A fast, reliable, and safe solution, even in cold or rainy conditions.

Mechanical strength, UV resistance (5,000 h), flexible installation

Thanks to its woven polyester reinforcement and 520–500 g/m² PVC coating, Stamisol Extreme Pack 500 delivers a tensile strength of 2,500/1,500 N/5 cm, maintaining 90% of its performance after 336 hours of UV exposure. It also offers outstanding nail tear resistance and remains flexible down to –40°C.

Rated Euroclass E / VKF 5.3 (RF2), it provides excellent resistance to driving rain and is guaranteed for 24 months during the construction phase—even when used as an emergency roof cover.
It is compatible with photovoltaic and solar installations and can be installed over all types of insulation.

Efficiency, adaptability, durability

Combine robustness and speed on exposed job sites: Extreme Pack 500 ensures ultra-secure installation even at high altitude, with a prefabricated membrane that can also be easily welded or bonded. It withstands harsh weather and can be installed from 5°C.
It is the only roof underlay membrane designed specifically for mountain climates and covered by a Technical Assessment (Avis Technique).

Complete system, certifications & accessories

Complete your roofing system with Stamisol accessories (butyl tapes, molded parts, adhesives) to efficiently treat every joint and detail.
Explore the rest of the range:

• Stamisol Advanced Eco for breathable underlays
• Stamisol Extreme DW for premium HPV roof underlays

Extreme Pack 500 is ISO 9001/14001 certified, listed in WUFI, compatible with Minergie-Eco, and benefits from a 10-year system warranty—even in extreme conditions.