The message
from Alec contains these words:

I made a post a few weeks ago that made no headway as my explanation
wasn't that good. Anyway my garage is at the end of a terrace of
garages with a single skin brick wall and corrugated asbestos roof. I
have found the damp problem I had originally posted about. The asbestos
roof is pourous the bottom of it is soaking wet and it's also dripping
in places. What can I do as I use it as a workshop type area with tools
and bit's and bob's all over the place, that I obviously don't want
getting wet/damp.

Are you sure about that? We haven't had much rain of late and
condensation can be sufficiently bad to drip in certain circumstances.

--
Roger Chapman