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does a draughty attic pull heat from mineral wool?

  • 07-12-2015 7:02pm
    #1
    Robbie71
    Registered Users, Registered Users 2 Posts: 122 ✭✭


    I have a dormer & converted attic space .
    The crawl space behind the walls gets very cold/draughty.
    The walls in crawl space have glass/mineral wool on top of foil backed plasterboard.
    Would I be right in thinking the movement of air pulls heat from the mineral wool.
    If so , would a solution be covering the mineral wool with a breathable membrane (any suggestions?) to seal the wool from main draughtiness or maybe put solid insulation over the wool e.g. polystyrene /kingspan? or
    seal off the sloped roof with a membrane to stop draughts.
    I do understand that some ventilation is required ..


Comments

  • #2
    Victor
    Registered Users, Registered Users 2 Posts: 78,577 ✭✭✭✭Victor


    Robbie71 wrote: »
    seal off the sloped roof with a membrane to stop draughts.
    The risk is that you get condensation within the roof, potentially rotting the timber, warping the plasterboard and making the fibreglass soggy.


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