ISOCELL OMEGA 125 Breathable Wind and Weather Barrier 125 g/m², 3.0 x 50 m

ISOCELL OMEGA 125 is a high-quality, vapour-open wind and weather membrane that ensures long-term protection of building structures against moisture and wind. Thanks to its very low sd-value (~0.025 m), the membrane allows moisture to exit the structure while remaining fully waterproof and windproof (W1 classification). The three-layer PP fleece provides high mechanical strength and durability, making the membrane suitable for façades, pitched roofs, and intermediate floor structures. OMEGA 125 is a solution highly valued by professionals in the construction of energy-efficient and breathable buildings.

Key Advantages

• Vapour-open wind barrier membrane

• Very low sd-value ≈ 0.025 m

• W1 waterproof classification – protection from rain and snow

• Strong and durable 3-layer PP material

• Suitable for façades, pitched roofs, and wall structures

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

• Improves energy efficiency and keeps structures dry

Technical Data

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

• Elongation:
  – Lengthwise: ~65 %
  – Crosswise: ~70 %

• Thickness: ~0.35 mm

• Weight: ~125 g/m²

• Roll size: 3.0 x 50 m

• 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 protection for façades

• Underlay membrane for pitched roofs

• Wall structures in timber-frame and prefabricated buildings

• Protection of thermal insulation from moisture and wind

Frequently Asked Questions

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

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

What does "vapour-open membrane" mean?
– It means that moisture can escape from within the structure, but water and wind cannot get inside.