Damp coming in due to partially demolished outhouse

[annajl]

I'm decorating a room for a friend and have noticed damp in one corner.

It's in a really old stone cottage and was an internal wall until the adjoining outhouse was partially demolished.

It's an old external wall, but I think the damp is coming in because the outhouse walls are mostly still standing (about 3/4 original height) without a roof on them. The damp is coming in at ground level where these walls meet the wall of the house at right angles.

Obviously, without being able to show exactly what I mean, is it possible that capping these outhouse walls with something stop the problem? If so, what would be suggested as I know concrete isn't the best idea in old houses.

 

[barryo]

Check the floor level of the old outhouse. If necessary, lower it to below the internal floor level and/or install a french drain. Don't be tempted to install an injected dpc; they don't work, especially in stone walls. If this doesn't solve the problem, come back.