Permavent BLACK is a vapour-permeable roofing underlay suitable for use in both roof and wall applications. It is designed to form an airtight layer within the building envelope.
The underlay allows the controlled passage of water vapour while providing resistance to external moisture. With a W1 water resistance classification, Permavent BLACK is suitable for pitched roofing and walling applications.
Permavent BLACK is available with an integrated tape system, enabling sealed overlaps to support airtightness, improve installation efficiency, and reduce material waste on site.

• Vapour-permeable roofing underlay for roof and wall constructions.
• Suitable for use with all types of solar panels.
• BBA certified 25/7479.
• BLACK meets underlay recommendations in BS 5534:2014+A2:2018. Slating and tiling for pitched roofs and vertical cladding. Code of practice.
• Assists with condensation control through vapour permeability.
• W1 water resistance rating for external moisture protection.
• Integrated tape for sealed horizontal laps and reduced on-site waste.
• Available in 1m x 20m, 1m x 50m and 1.5m x 50m rolls (untaped).
• Available in 1m x 50m rolls (taped).