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Floor insulation question

  • 28-07-2021 9:35am
    Registered Users Posts: 504 ✭✭✭ pawdee

    My builders are about to pour my concrete floor slab for an extension. The radon barrier is in, insulation fitted, and the plumber is running pipes. We've had torrential rain and the insulation is literally floating. They've put concrete blocks to stop it lifting up.

    My understanding is that the concrete will just shove everything down evenly, displacing the water and that it'll be grand. I'd have preferred if the concrete was poured when everything was bone dry last week. Does anyone know whether it makes a lot of difference? I'd be interested to hear what more experienced construction people than me have to say. Thanks.


  • Registered Users Posts: 32 docst

    Eh... Are you pouring the finished floor? I take it that's theres no underfloor heating involved.

  • Registered Users Posts: 504 ✭✭✭ pawdee

    There's no underfloor heating involved. Just a concrete slab onto which I'll be putting timber flooring. In the meantime I hired a submersible pump and pumped out all the water.

  • Registered Users Posts: 1,933 ✭✭✭ Explosive_Cornflake

    It'll be fine, the concrete will push the water out. Happens in probably 95% of pours. You should have steel mesh on top of the insulation though, and any services would normally be tied onto the mesh and these will floating during the pour.

  • Registered Users Posts: 504 ✭✭✭ pawdee

    The heating pipes are just clipped to the insulation but there's no mesh reinforcement. I better ask the builder about that. Thanks for the advice.