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What is the Air Permeability value for APEX?

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

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Where I can find my local supplier?

Click here to check where your nearest stockist is.  

 For any other enquiries please contact our sales office 01305 766 703 

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Are there any Permavent membranes suitable for all UK wind zones?

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

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Can I use Permavent APEX on a cold/warm roof application?

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

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Can I use Permavent APEX without any ventilation?

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

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Can Permavent APEX be left exposed before roof slates/ tiles are installed?

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

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Can Permavent breathable membranes be left exposed before roof slates/ tiles are installed?

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

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Do I need to install a VCL when using Permavent APEX?

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

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Is Permavent APEX cost effective?

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.  

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What UK wind zones is Permavent APEX suitable for?

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

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What is the drying out period?

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. 

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What is the minimum pitch for slates?

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°. 

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What is the minimum pitch for tiles?

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°. 

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What is the minimum recommended lap for APEX?

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. 

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Browse our common questions

What is the Air Permeability value for APEX?

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

Further Info

Where I can find my local supplier?

Click here to check where your nearest stockist is.  

 For any other enquiries please contact our sales office 01305 766 703 

Further Info