On 22/06/2019 09:31, Tim Lamb wrote:
In message , Brian Reay writes
Jim GM4DHJ ... wrote:
why do the English not use sarking ? ....




They do.

Some older houses may not have it but more modern ones certainly do. All
the houses we own/have owned have sarking felt.

Huh! Now try and get your builder to use it!
They have latched on to porous membrane in the firm belief that roof
ventilation is no longer necessary.

Modern rooves will have soffit vents and ridge venmts

So there is no need for permeawble sarking

But of course a porous membrane DOES ventilate

Sarking is ther to reduce wind speed and stop tiles being sucked off




Also try and get them to use the
grade required for your area wind prediction and double sided tape for
laps:-(



--
"In our post-modern world, climate science is not powerful because it is
true: it is true because it is powerful."

Lucas Bergkamp