This is only happening when it rains ? Are you looking in the right place
for leaks ? The rain water may be coming from a blocked guttering trough
and overflowing down over the back and then down the surface of the masonry
and through to the inside through the airbrick.
It could also be coming through the old joints in the masonry and you may
need the wall repointed again. Not actually seeing the site and the
positions of things is a real pain and makes this type of diagnoses almost
impossible over the net. So these are just some suggestions of what could
be. Widen your search of the roofing materials and you may find that it is
further away from the spot you think it is coming from.
Many thanks. Sounds like we need to get a big ladder to have a closer
look at the guttering.
We have decided to get a chartered surveyor round shortly so hopefully
he will be able to give us some advice on the state of the pointing
and whether it needs to be redone.
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