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Ha I've been rumbled. Obviusly one of the previous occupants must have boarded over the problem without tackling the underelying causes. I'm not pointing the finger (or repointing the house) but here's a clue; Who does this remind you of: "I'm going to be tough on damp, and tough on the...

Forgot to add: Yes I thought the floorboards and joists looked more like 20 years old (rather than 1930's) and suspicious that not tied into the wall. Now you mention it, it looks that they were replaced; and the hole in the wall under the floorboards is just the right shape to take a timber...

Thanks for the suggestions and such clear and useful diagrams - very informative. In response to the points raised: Too late, have now exchanged. They are in the next but one course above the outer skin dpc - in the photo below, the damp course runs in the mortar course above the cable...

Got access to cavity through a hole just under the the slate on the inner skin - see photos (if it works this time) that show the slate dpc below the floorboards and some of the rubble (light brown clour) I dragged out from the hole. The slate can be seen running along at 1 course below the...

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Hi, You were right -it's not rising damp...... Have now been able to look under one small area of floorboards and found out: Whilst the outer skin slate dpm is 1 course above the outside ground level (concrete), the floor board level is one course below the outside ground level. See...

Thanks for the replies, There is some crumbling plaster in and around the bay, but most of the side wall seems to be so sound. From memory there is only a small patch of mildew in the bay area. and no other signs (salt residues etc) I'll have to wait until I exchange before I can get access to...

The contractor used a resistance meter to identify the damp. It's possible it's condensation, the house has been empty for sometime, but I thought this unlikely as the walls have cavity wall insulation. Maybe it's penetrating damp - I don't know. I certainly don't want to spend out...

I have damp (according to the surveyor & damp contractor) along the base of the two walls (front bay & side) of 1930’s semi. I am in the process of buying the house. The damp contractor has suggested stripping off plaster to 1m, injecting a chemical barrier & replastering. I have just...