ISOCELL OMEGA 125 breathable windproof membrane – 125 g/m²

ISOCELL OMEGA 125 is a high-quality, vapour-open wind and weather membrane that provides long-term protection for building structures against moisture and wind. Thanks to its extremely low sd-value (~0.025 m), the membrane allows moisture to escape from the structure while being fully waterproof and windproof (W1 class). The three-layer PP fleece provides strong mechanical strength and durability, making it suitable for façades, pitched roofs, and intermediate floor structures. OMEGA 125 is a trusted solution among professionals for building energy-efficient and breathable buildings.

Key Advantages

• Vapour-open wind barrier membrane

• Very low sd-value ≈ 0.025 m

• W1 water resistance – protection against rain and snow

• Strong and durable 3-layer PP material

• Suitable for façades, roofs, and wall structures

• Wide temperature tolerance (−40 °C to +80 °C)

• Improves building energy efficiency and structural dryness

Technical Data

• Tensile strength (EN 12311-1):
  – Longitudinal: ~305 ± 45 N/50 mm
  – Transverse: ~180 ± 25 N/50 mm

• Elongation:
  – Longitudinal: ~65 %
  – Transverse: ~70 %

• Thickness: ~0.35 mm

• Weight: ~125 g/m²

• Temperature resistance: −40 °C to +80 °C (short-term up to +100 °C)

• Water resistance: Class W1 (standard wind- and waterproof)

• Fire classification: EN 13501-1 / EN 11925-0: E

Applications

• Wind barrier for façades

• Underlay membrane for pitched roofs

• Wall structures in timber-frame and frame houses

• Moisture and wind protection for insulation

Frequently Asked Questions

Is ISOCELL OMEGA 125 waterproof?
– Yes, the membrane meets the W1 waterproofing class and protects structures from precipitation.

Is it suitable for façades?
– Yes, OMEGA 125 is primarily designed for use as a wind barrier in façade and wall structures.

What does “vapour-open membrane” mean?
– It means that moisture can escape from the structure, but water and wind cannot enter.