ISOCELL OMEGA DRAINY PLUS diffusion membrane, 450 g/m², 1.5 × 25 m

ISOCELL Omega Drainy Plus – diffusion-open diffusion membrane for metal roofing

ISOCELL Omega Drainy Plus is an extremely vapour-permeable diffusion membrane specifically designed for installation under metal roofing (e.g. sheet or profiled metal roofing). The membrane protects roof structures against moisture, condensation, rain and wind and ensures air circulation within the roof structure, helping to keep timber structures and thermal insulation dry and extending the service life of the roof system.

Key features

• Rain- and wind-resistant diffusion membrane protecting against snow and water ingress.

• Extremely diffusion-open – very low sd value (~0.02 m), allowing active vapour transmission through the material.

• Three-layer PP fleece with integrated 3D mesh – ensures durable protection and top-side ventilation, protecting the membrane from heat and mechanical damage under metal roofing.

• Suitable for ventilated pitched roofs, especially under metal roofing where condensation management is critical.

• 100% recyclable and UV-stabilised material.

• Anti-slip and anti-glare surface for easier installation.

Dimensions and packaging

• Roll: 1.5 m × 25 m (37.5 m²)

Applications

Omega Drainy Plus is intended for:

• Use under metal roofing in ventilated pitched roofs.

• Installation directly on wooden decking or thermal insulation.

• Protection of roof structures against moisture and condensation, improving moisture management.

Technical data (key values)

• Sd value: approx. 0.02 m

• Material: three-layer PP fleece with 3D PP mesh

• Tensile strength (EN 12311-1): approx. 295 / 205 N/50 mm

• Elongation: 50–60%

• UV stability: temporary resistance to UV exposure (several weeks)

Why choose Omega Drainy Plus?

Omega Drainy Plus is an ideal solution for projects where a diffusion membrane installed under metal roofing must ensure effective moisture control, ventilation and long-term structural protection.