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insulated foundation

  • 05-09-2012 1:38pm
    #1
    ivorfa
    Registered Users, Registered Users 2 Posts: 43 ✭


    Could some one tell me is a dpm required under the walls on an insulated raft foundation there is a radon barrier beneath the raft your help would be much appreciated the walls are icf construction


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    are you using a separate provider / contractor for insulated foundation and ICF build?


  • #3
    ivorfa
    Registered Users, Registered Users 2 Posts: 43 ✭ivorfa


    Yes the insulated foundation is complete and about to start walls, contractor for walls thinks a dpm should be used but manafactures of insulated raft foundation say a dpm is not nessasery as there is a radon barrier beneath the raft


  • #4
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    the answer to you question is specific to:

    1. the height of the radon membrane termination above path level
    2. the internal floor finish level in comparison to this radon level

    eg if the dpm will simply be a horizontal slip laid over the top of the foundation then i see no point to it. However if it will have an upstand internally then it wont do any harm.

    If your radon membrane, which should have an upstand, terminates at least 150mm above path level, then its debatable as to what an additional dpm would do.


    But to be honest, its impossible to give a correct answer without seeing the detail and knowing the proposed levels.
    Have you not got an architect / technician or engineer working on your behalf?


  • #5
    ivorfa
    Registered Users, Registered Users 2 Posts: 43 ✭ivorfa


    Yes i have an architect he says I should put a dpm in, so to be on safe side
    il probably do that was just wondering what other people did as insulated raft company says its not nessasary thanks for your reply.


  • #6
    Markcheese
    Registered Users, Registered Users 2 Posts: 8,838 ✭✭✭Markcheese


    Would have thought a foundation made mainly of aeroboard would be pretty damp-proof it's self.... In fact if it wasn't I'd be kind of worried...but then I'm not engineer...

    Slava ukraini 🇺🇦



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  • #7
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Markcheese wrote: »
    Would have thought a foundation made mainly of aeroboard would be pretty damp-proof it's self.... In fact if it wasn't I'd be kind of worried...but then I'm not engineer...

    Aeroboard is not going to keep the water out! In principle it's the concrete that's water proof, but if it was my house - dpc


  • #8
    engineermike
    Users Awaiting Email Confirmation Posts: 280 ✭✭engineermike


    hi,
    I've done a bit of fault analysis on insulated raft foundations - where they were reliant on the radon barrier. Moisture was getting drawn up through the slab and high moisture readings were noted in the sole plate and the foot of the structure.
    For what it entails I'd go for a dpc, - the cost is minimal & your arch. and builder can agree the spec. quite easily.
    Mike f


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