PERMAVENT PVBA50 Apex Air Permeable Breather Membrane Untaped 1m x 50m

Permavent Apex Membrane

Permavent APEX is a 3 layer breather membrane for use as a pitched roof underlay. Permanent APEX is a vapour and air permeable membrane 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.

Permavent APEX membrane is fully compliant with BS 5534: 2014 + A2 2018 and an integrated tape allows APEX to be installed in all UK wind zones.

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.