Information

Please use the links listed on the right to find required information.

Should you need further assistance please contact a member of our technical department on 01305 823330 and we will be more then happy to assist you.

NEW !!!

Not all breather membranes are the same!

Breather membranes are designed to combat condensation in the roof-space and should do just that.

New air testing rules require the elimination of drafts completely. A cold non-vented roof space using breather membranes can be up to 25% more energy efficient than the traditional vented roof space. This means that a cold non-vented roof is now an important design element. Forthcoming regulations will also insist that the thermal bridge, which occurs over the wall plate at eaves level, is addressed and this is best achieved again using the cold non-vented system.

Independent research from the Caledonian University has indicated the importance of using the right breather membrane and recommends a vapour resistance of below 0.16 MNs/g-1.

Current building regulations require that all breather membranes should be independently tested for the specific purpose that they are used for. The industry prefers the BBA certification method but not all breathers have the cold non-vented certificate.

  When choosing a breather membrane you must ensure it has the correct certificate!

Permavent™ currently holds 6 BBA certificates and 3 IAB certificates for our complete rage covering all aspects of roofing underlays.

To help you decide which breather to insist on we are publishing our comparison chart  which reproduces information taken from the BBA web site (www.bbacerts.co.uk) showing the results of their tests, across various membranes.

NOTE!  

To help reduce costs many of the cheaper breathers do not use sufficient U.V stabiliser!

If your breather fails to meet the new regulations, are you really saving money if you are later forced to re-roof?

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