Permavent GRAPHITE is a high-performance, vapour-permeable roofing underlay designed to provide a secondary weather barrier beneath tiled and slated pitched roofs. Suitable for new-build and refurbishment projects, this breathable roofing membrane helps protect roof structures from external moisture while allowing water vapour to pass through. Designed to meet the underlay recommendations of BS 5534:2014+A2:2018, Permavent GRAPHITE combines reliable weather resistance with high tensile and tear strength, making it suitable for professional roofing installations. The membrane features integrated lap tape to help create sealed horizontal overlaps, improving installation efficiency and reducing the need for additional sealing materials.
Key Features
130gsm breathable, vapour-permeable roofing membrane.
Roll dimensions: 50m long x 1m wide.
Nominal coverage: 50m² before overlaps and wastage.
W1 water resistance classification.
High tensile strength for installation durability.
High tear resistance around fixings and penetrations.
Integrated lap tape for sealed horizontal overlaps.
Suitable for tiled and slated pitched roofs.
Suitable for use with solar panel installations where specified.
BBA Certificate 25/7479.
Meets relevant recommendations of BS 5534:2014+A2:2018.
UV exposure rating of up to 3 months, subject to manufacturer guidance.
Suitable for new-build and refurbishment roofing projects.
