On 15/07/10 19:15, js.b1 wrote:
On Jul 15, 11:38 am, "george
wrote:
But without felt I will notice the roof leak

Yes, and you can usually find it more easily.

And felt cuts ventilation drastically.

It does greatly reduce ventilation to the loft, but the felt should
sag noticeably so as to provide good ventilation around the tiles. The
loft should be ventilated by "opposed" soffit vents to get cross-flow
air just like underfloors, but older houses often have chrysotile
soffit boards which lack vents.

Yes,
my house was ventilated through the slates
so now the roofers have felted it
I'm worrying about new ventilation routes.

[g]