On Jun 5, 9:24 pm, "Will" wrote:
"Roger" wrote in message

k...



The message
from "TMC" contains these words:

The damp has to come from somewhere and as it is only a small patch on
both sides of the wall it isn't condensation. Ergo it must be coming
down from somewhere above within the wall. It is quite possible for
water to find its way through voids within the wall and pool at the
point where its flow is restricted or barred but as it would take the
line of least resistance the source doesn't have to be directly above
the damp patch.

If it is rain water then in times of drought the patch should dry out or
at least get dryer. However it could be a pipe that passes through the
wall somewhere above that is leaking into the wall.

If you have defective guttering/downpipes that should be fixed as a
matter of course regardless of whether it is causing your present
problem. Obviously it would be a boon if fixing the drainage fixed the
problem but the defective pointing would need attention too.

I think this is probably spot on. I just found the survey I got done
on the house about 8 years ago, and the back wall (the one with the damp) is
a 10.5" cavity wall, so it might be that the water from the faulty guttering
is dripping down into the cavity (given that it's directly above it). I
guess what threw me was where the damp patch was - half way up the wall -
but as you say, it's flow is probably restricted at that point, so that's
what's causing the problem.

It is damp on both sides of the cavity?

Are you an idiot?

To start with, if it is coming in in the rainy weather it will dry out
considerably when it's dry but when wet it will be wet as hell.

What could be constricting the cavity long enough to stop the rain
dropping past it on the inside or staying long enough to cause quite a
large damp patch?

If it is a small damp patch that is present in dry or wet spells it is
coming from a leaking pipe or connection.
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