No Rising Damp but Damp Slab Foundation
Drainage pipes, concrete, footings and foundations. Post your questions and find answers here

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Swan99
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No Rising Damp but Damp Slab Foundation

by Swan99 » Sun Jan 21, 2024 2:16 pm

I bought a house with a musty damp smell.
2 damp specialists said my walls were dry and the smell was condensation. I left all the windows and doors open for a few weeks, cleared the house of all flooring etc and put down plastic sheeting everywhere both as a moisture and a dust barrier.
Pulling back the sheeting in the living room last week the concrete slab has large and small patches of wet black mould and water sitting on certain patches.

There is no dampness spreading up the walls as the edges of the floor are dry.

This is what it was like when I initially took the flooring up but thought I had dried it out before laying the sheeting.

I am guessing the dpm has roger failed in the middle

or could it be sweating concrete

or condensation

or the fact that the outside soil levels are slightly above the dpc and floor level?

Or a combination of some or all of the above

Swan99
Apprentice
Apprentice
Posts: 9
Joined: Thu May 19, 2022 10:09 pm

Re: No Rising Damp but Damp Slab Foundation

by Swan99 » Sun Jan 21, 2024 2:19 pm

Just to add that the living room is predominantly the only room on the ground floor that was part of the original building which was extended substantially in the 70s

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