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Damp Advice (concrete floor)

Discussion in 'Decorating and Painting' started by Stattman, 20 Jul 2016.

  1. Stattman


    8 Mar 2014
    Thanks Received:
    United Kingdom
    Hi Forum,

    My lounge floor has a serious damp problem which has been diagnosed as the concrete slab. As you see from the photo the damp permeates the immediate area, has affected the plaster on the chimney (plaster in contact with floor) as well as adjacent alcove walls.


    Two questions:

    1) I have noticed more sweating on the floor on hot days like today (damp clearly glistening) compared to rainy days where it becomes dry. Is there any connection at all with how dry the outside is?

    2) a damp specialist said the chimney breast plaster would have been in contact with the floor, and has gone on to recommend a breathable plaster membrane. I'm slightly sceptical because some exposed brick behind the plaster is bone dry.

    My view was to fix the concrete slab first (membrane and level) and perhaps re-render the chimney breast; then monitor and take stock...

    I do want to get to the root cause of the problem rather than covering the symptoms with specialist products... Hope that makes sense...

    Appreciate any feedback and thoughts.

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