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We're in a semi and the damp is on the wall nearest to the detached side but on the front facing wall. There is a pillar-like structure in that corner so the front of the house doesn't internally corner directly to the side of the house of that makes sense. The damp is above the window and just before where the external wall meets that alcove square pillar. The damp only comes down about 2 ft from the ceiling and it is not reading that high but does seem to go up after it rains. Only two measurements have been taken so far though and the room is damp at the mo anyway from the rest of the plaster drying out on the ceiling and other walls.
I can see that the plaster on that wall is newer than the rest of the old plaster in the room so it must have been an issue before at some stage.
The outside of the house is rendered at the front but there are no visible cracks in that area. There is wood running along the outside though (in that area) so I'm wondering if water is resting between the wood and the render and slowly permeating...
I can't see any lead valleys but the roofer didn't think that was a problem. It does seem to be where two slopes of roofs meet though which initially made me think it was the valley. I might have to get another roofer out. It would seem strange for the roofer not to be honest when it comes to securing a job though which is what made me trust him.
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OReilly
Need more information about the exact location of the damp; symmetrical on the wall, are you mid terrace, how far down the wall does it come, what is your wall currently covered with?
Also, what is the structure externally of your roof with respect to where the damp is? Are there lead gulley/valleys where the damp is being detected?
I'm not an expert at all, but we had a lot of damp in our house...