Doctor Drivel wrote:

It has been proven that the breathable membrane is all that is needed,
but Building Control sill insist on an air flow so the eves ventilation
and ridge tiles have to go in. All they are doing is over cooling the
house in many cases.

Our BCO would have been happy with a breathable membrane and no
additional ventilation.

Rip out existing
sarking with a Stanley knife. Install membrane between rafters stapling
and using tape where needed,.

Personally I would not be happy with replacement sarking installed like
that, since it will defeat one of the benefits of having it in the first
place - i.e. as a secondary weatherproofing layer under the tiles.


--
Cheers,

John.

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