Best breather membrane- air and vapour permeable

[ab12]

I'm in the process of doing a full re-roof to replace old bitumen leaky felt. 

 

Would like to go with breather membrane that is air and vapour permeable. Any recommendations please.

 

Pitched roof will be finished of with fibre cement tiles with a dry ridge system and eaves ventilation.

 

It appears most of the membranes on the market are air tight and vapour permeable and a limited supply are both air and vapour permeable.

 

 

 

[JOE187]

https://klober.co.uk/membranes/roof-membranes/p/air-160       Tape all joints.

[G and J]

We used this

 

 Permavent APEX is a 3 layer breather membrane. APEX is both air and vapour permeable

[JohnMo]

We used proctor Roofshield, it vapour and air open.