Fully Air Permeable
APEX air permeability allows moisture to escape through the movement of air to flow through the roof, which eliminates interstitial condensation in pitched roofs. This can be particularly important during the drying out period of a new build.
Vapour Permeable
Permavent APEX vapour permeability helps to reduce the condensation withing the roof structure, whilst protecting it from the rain and wind outside. Permavent APEX has Sd value 0.01m.
Water Resistance
Permavent APEX is highly water resistant with W1 rating (EN 13589).
NHBC Acceptance
Permavent APEX has been endorsed by NHBC for use as an unsupported roof underlay without the need to provide any ventilation at either high or low level.
Compliant with BS 5534: 2014 + A2 2018
Permavent APEX is fully compliant with BS5534 and can be used in all UK wind zones without the need any ventilation.
Integrated Double Tape System
Permavent APEX comes with unique integrated double sided tape system. This ensures that the laps of the membrane are restrained in any weather condition using a 100mm head lap and meet the BS5534 standard. Reduces membrane usage by up 25%.
