Underfloor insulation - where to stop?

Discussion in 'Builders' Talk' started by Shamone P, Dec 7, 2017.

  1. Shamone P

    Shamone P New Member

    hi, hope someone with underfloor insulation/cavity wall experience can help.
    We are fitting the insulation now, but noticed that the floor joists next to walls are about a 1 inch away leaving a gap.
    Should I leave this gap or fill it with insulation?
    I think the cold air will just go up into the room above through here, but not sure if I need to leave it for air flow into wall cavity.
  2. KIAB

    KIAB Well-Known Member

    Shouldn't need tpo leave any gap for air flow into cavity.

    Post a photo.
  3. I know exactly what you mean Shamone. I fill those gaps.
  4. Shamone P

    Shamone P New Member

    Not down there today so can't get photo I'm afraid. Sounds like there's no problem with filling these gaps though from what you've both said.

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