Permavent APEX complies with NHBC requirements for cold/warm roof constructions without the need for any high or low level ventilation under the NHBC warranty.

Yes, Permavent APEX can be installed in both applications. For more complex roofs please speak with our technical department.

Permavent APEX air permeability value is >36.72m3/m2h50Pa. 

Permavent APEX is suitable for use in zones 1-5 (taped lap) and zones 1-3 (batten-restrained ≤345mm batten gauge).