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Rising Damp in Buildings

  • 11-09-2012 6:41pm
    #1
    Ger555
    Registered Users, Registered Users 2 Posts: 27 ✭


    Hey all,

    Recently I have noticed what I consider to be 'rising damp' in one of the rooms of my house. It started off as a damp smell in the room and with some mould growth on the wardrobe and furniture in the room......

    I removed the carpet and underlay in the room to discover a wet patch/line along the concrete floor. No water pipes pass under the floor slab in this room.

    The house was built on a raft foundation in a particularly wet site (prior to drainage of the site before construction commenced). The make-up of the sub-structure of the house is 300mm of concrete (raft) approximately 700mm of stone (surrounded by three rows of external and internal rising block walls, a layer of radon barrier, 50mm of floor insulation and a 75mm concrete screed (internal floor).

    Does anyone have experience of rising damp in buildings? Or ideas on the possible causes or remedial solutions?

    All help appreciated. Thanks


Comments

  • #2
    BE_MIEI
    Closed Accounts Posts: 37 ✭BE_MIEI


    Ger555 wrote: »
    Hey all,

    Recently I have noticed what I consider to be 'rising damp' in one of the rooms of my house. It started off as a damp smell in the room and with some mould growth on the wardrobe and furniture in the room......

    I removed the carpet and underlay in the room to discover a wet patch/line along the concrete floor. No water pipes pass under the floor slab in this room.

    The house was built on a raft foundation in a particularly wet site (prior to drainage of the site before construction commenced). The make-up of the sub-structure of the house is 300mm of concrete (raft) approximately 700mm of stone (surrounded by three rows of external and internal rising block walls, a layer of radon barrier, 50mm of floor insulation and a 75mm concrete screed (internal floor).

    Does anyone have experience of rising damp in buildings? Or ideas on the possible causes or remedial solutions?

    All help appreciated. Thanks

    I dont really understand the construction. Was the raft foundation designed by an engineer? Why is there 700mm of stone over the raft? Does the radon barrier turn upwards at the external walls and continuous with the dpc at finished floor level? What level is the external ground level relative to the internal finished floor level?


  • #3
    con1982
    Registered Users, Registered Users 2 Posts: 515 ✭✭✭con1982


    Ger555 wrote: »
    The make-up of the sub-structure of the house is 300mm of concrete (raft) approximately 700mm of stone

    I think this means a 300mm raft on 700mm hardcore. (700mm seems like a lot),



    It's really difficult to say what the problem might be without seeing the house and site. You say that the house is built on a "particularly wet site", which concerns me slightly. Can you expand on what this means? Do you get much surface water ponding? Is the house built on a low spot? What level is the groundwater at?

    I think you should ask a local engineer, architect or building surveyor to inspect. Alternatively, posting some internal and site photos here might help.


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