"Brian G" wrote in message
...
Phil wrote:
Hi all,

We've just discovered some dry rot in the house whilst renovating the
en-suite (ground floor, in the extension, with a flat fibreglass
roof). We've knocked off
all the plaster and render from the block walls and plan to treat them
with some
cuprinol dry rot stuff, and we're replacing all the wood from the
room. However, when we took down the ceiling plasterboard, we found
that the rot had touched the ends of two of the joists (about 60cm
worth, from ends towards the middle).

Besides a roof leak. Just a thought; that dampness isn't in part due to
lack of a proper vapour barrier, on the warm side of the walls/ceilings,
thereby allowing house moisture to condense inside the structure and cause
rot?