Permavent APEX is a 3 layer breather membrane for use as a pitched roof underlay. Permanent APEX is both vapour and air permeable providing unique condensation control which eliminates the need for low or high level ventilation. Permavent APEX also provides a secondary barrier to water ingress.
APEX has been endorsed by NHBC for use as an unsupported roof underlay in cold pitched roofs without the need to provide any ventilation at either high or low level.
- Air and Vapour permeable membrane
- 180 g/m2
- Use without ventilation
- NHBC approved
- Conforms to BS5534
- LABC Certified
- 3 layers membrane
- For use on any types of roofing/walling applications
- UV stable for 3 months
- Available in 1m x 50m roll