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

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Permavent MAX ALL Zones is Suitable for all UK wind zones regardless of fitting method. 

Yes. For more complex roofs please speak with our technical department. 

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

Yes, it can. Permavent APEX is UV stable for up to 3 months. 

Yes, it can. Permavent membranes are UV stable for up to 3 months. 

A VCL is not required for non-ventilated cold roof installation.  

Permavent APEX is cost effective. The reduced lap (100mm) will decrease the membrane usage. The integrated double tape system will save time and labour, as well as eliminating the need for restraint battens.  

Permavent APEX is suitable for use in zones 1-5 (taped lap).  

The drying out period is the period when all the moisture in the building is drying out, including moisture in building materials and any moisture that find its way in. The air and vapour permeable properties of APEX helps with the condensation during this period. 

The minimum pitch for slates is recommended 20° (BS 5534) 

Using our Easy Slate your roof pitch for slate roof can be as low as a 12°. 

The minimum pitch for tiles is recommended 35° (BS 5534) 

Using our Plain Easy your roof pitch for slate roof can be as low as a 17.5°. 

The majority of breather membrane manufacturers recommend installing their membranes with a 150mm lap. Permavent APEX has been tested and approved for installation with 100mm membrane lap.