Thermafleece Breather Membrane

Manufactured from three layers - two outer nonwoven polypropylene layers and a central microporous breathable film - it provides excellent vapour permeability without compromising on water resistance. With compliance to EN 13859-1 for pitched roofing and EN 13859-2 for walls, this membrane offers long lasting reliability and versatility in both new builds and refurbishments.

Key Benefits

• Lightweight and easy to handle - simple to cut, lift and install.
• High Breathability - helps manage moisture while maintaining thermal efficiency.
• Water Resistant - protects insulation from external moisture and debris.
• Dual Coloured Design - black on one side, grey on the other, with no printed text for a clean finish.
• Multi Purpose Use - ideal for walls, floors, pitched roofs and loft applications.
• Durable 3 Layer Structure - enhanced tear resistance and long service life.

Standards and Performance

• EN 13859-1: roofing underlay (pitched roofs)
• EN 13859-2: wall applications
• EN 12311-1: elongation and tensile strength
• EN 12310-1: tear resistance
• EN 12572 Set C: vapour transmission
• EN 1928: water penetration and artificial ageing
• EN1109: low temperature stability

Installation Guidelines

Walls

• Fix membrane to wall structure, starting at the bottom and working upwards.
• Ensure 100mm horizontal overlaps and 150mm vertical overlaps (avoid vertical laps within 300mm of corners).
• Protect bottom timbers with adequate overlap.
• Fix with galvanised nails, stainless steel staples or equivalent permanent fixings.
• Avoid prolonged exposure to UV and weathering - use temporary protection if necessary.

Floors

• Can be used to support insulation between suspended floor joists or as a protective layer above insulation.
• Staple or nail securely to joists - for best performance, staple to the lower side of one joist, run across, then fix to the next.
• Ensure 100mm overlaps between layers.
• Can also be used as a protective loft insulation cover to prevent debris build up.

Further Guidance

• Handle carefully to avoid tears or punctures.
• Repair any damage using suitable airtight tape.
• Ensure sufficient ventilation to meet building regulations.
• Store in a dry, sheltered conditions until installations.