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10-15mm gap under insulated plasterboard?

Discussion in 'General DIY' started by AzK, 15 Jan 2021.

  1. AzK

    AzK

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    Hi

    I have bought a couple of insulated plasterboards (Knauf XPS Laminate Plus Insulated Plasterboard Tapered Edge) to go on a ground floor external wall that is cold and it cant be insulated externally.

    I understand that on ground floors, you need to leave a 10-15mm gap between the bottom of plasterboard and the floor to avoid any damp or moisture rising up through the board.

    My question is as I am trying to insulate a cold wall, do I just leave this gap of approx 10mm x 27mm hollow? I am worried about both heat escaping and also coldness coming through this gap.

    I have seen in some places that people suggest using skirting board - whilst this visually covers the gap it doesnt quite deal with the issue of insulating that area.

    Any reccomendations or suggestions? Is there a foam or other product I can use to fill to both fill the gap and that is moisture resistant?

    Thanks
     
  2. KenGMac

    KenGMac

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    What is the floor made of? Timber or Concrete?

    The fitting of a Skirting seems most appropriate

    Ken
     
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  4. AzK

    AzK

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    Hi. It's a concrete floor with laminate (plus the usual underlay etc)
     
  5. JobAndKnock

    JobAndKnock

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    If you need to fill the gap you can get closed cell foam piping (e.g. Fossa CaulkSaver) from decorators wholesalers and some places on line in a variety of sizes
     
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  7. Swwils

    Swwils

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    If the floor isn't insulated then the heat loss through that junction won't be the first thing to tackle.

    For the gap you can use a flexible insulation or a foam as suggested.

    Also note that Knauf XPS Laminate Plus does not have a dedicated water vapour resistance barrier.
     
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