On 15/07/10 10:54, js.b1 wrote:
Eh?

Sarking felt is a very beneficial development.
Realise a lost slate means you are getting water ingress from that
point to the ridge, not just that "small hole".

But without felt I will notice the roof leak
when I'm checking the attic and see light or water
or when i see dampness on the ceiling
But with felt the leak could be undetected for years,
rotting the timbers down below.

And felt cuts ventilation drastically.

[g]