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Insulating above bay windows

  • 22-10-2013 12:34pm
    #1
    ravendude
    Registered Users, Registered Users 2 Posts: 589 ✭✭✭


    Hi,
    We have a couple of bay windows in our house. The rest of the house is insulated as well as possible (for a retrofit), ie. cavity wall and attic.

    The ceiling space above the bay windows probably only has the original insulation (100mm or so? house built 15 years ago) at best. It shows up a degree or 2 lower (even in the mild weather) when I put an infra red thermometer to it.

    So, I'm wondering how best to insulate? They are a couple of feet deep and the roof (protruding from the ground floor wall) over the ceiling is a couple of feet high.

    I'm thinking the ceiling could be drilled and rockwool pumped in? Not sure if this would be possible if there is already some fibreglass insulation in there?
    Any thoughts?

    Thanks...


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    take down plasterboard, install chicken wire between joists to ensure +50mm ventilation. ensure eaves vents are provided. (are lean-to vents provided? or is it tiles? ie is there air-movement under tiles? this would be good) install Vapour barrier/air-tight membrane to main wall, tack hold or chicken wire (or similar) 300+mm of insulation and pull vapour barrier under it, taped and sealed to windows/ wall above ceiling then replace the plasterboard, skim & paint. try to overlap with wall insulation above bay window ( if there is any, otherwise you'll want to look at this also)


  • #3
    ravendude
    Registered Users, Registered Users 2 Posts: 589 ✭✭✭ravendude


    Thanks for that, - I think I'll stay away from getting it pumped (I'm sure there would be plenty contractors happy to oblige despite being sure to fill the eaves!) and do a proper job on it in time, as you suggest. It doesn't sound like a huge job, so may have a go off of it in the spring time.


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