Damp plaster

3 Mar 2008
Reaction score
United Kingdom
My old house had one damp interior wall - no dpc- so I got a bricky to replace all the wall below floor level in engineering brick and with a modern DPC. Some years later I now find the wall is damp again to bout 400mm above the floor level. What could be causing this?
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It would help if you described the wall construction, and the rooms/area either side of the wall.

If you have a physical DPC, then the only way moisture can get up is if the DPC is broken or it is bridged.

The alternatives are a leaking service pipe, or depending on the wall materials and location, condensation

The wall is an interior wall, about 5 metre s long made of single brick. There is no plumbing above floor level. The brickie knocked away the brickwork below floor level down to sub-floor ground level, a distance of about a metre and built up in engineeering brick with a dpc about half way up.

Then its one of these

the DPC is broken

the DPC it is bridged


A fourth possibility is some soluble/hygroscopic salts deposited by the previous instance of damp, but this would have presented further moisture much sooner
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I would hope that there is no 'ground level' anywhere near an internal wall :eek:

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