Best breather membrane- air and vapour permeable

ab12 · Sunday at 05:59

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 · Sunday at 06:14

G and J · Sunday at 07:43

We used this

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

JohnMo · Sunday at 11:08

We used proctor Roofshield, it vapour and air open.

ab12 · Sunday at 14:01

5 hours ago, G and J said:

We used this

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

Thank you everyone.

Had a look at the prices and SD values

Permavent £160 SD value 0.01

Roofshield £150 SD Value 0.013

and Klober £259 SD value 0.009

On paper Kolbre wins in terms of breathability but is there a bif difference between 0.009 and 0.1 SD value?

If not then i think either Permavent or Roofshield

Also I dont quite understand do thes emembranes to be taped or can they be used untaped.

Look at the brochure if taped for example Permavent require 100mm overlap and if untaped then 150 mm overlap.

In terms of tape- any specific type of tape ? or standard waterproof duck tape?

ab12 · Sunday at 14:02

7 hours ago, JOE187 said:

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

Which type of tape please?

G and J · Sunday at 18:57

4 hours ago, ab12 said:

Also I dont quite understand do thes emembranes to be taped or can they be used untaped.

We did not tape but used the 150mm overlap (permavent)

JohnMo · Sunday at 19:04

7 minutes ago, G and J said:

We did not tape but used the 150mm overlap (permavent)

Neither did we

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