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A Few Internal Insulation Questions

  • 12-03-2013 11:18pm
    #1
    Registered Users, Registered Users 2 Posts: 368 ✭✭


    I hope to have insulated plasterboard put up in our bedrooms shortly.


    1. The house is cavity block (hollow block) construction and is drylined. There's no insulation between the plasterboard and the wall. Taking down the existing plasterboard would be very messy. Would it be ok to put insulated plasterboard onto the existing drylining plasterboard?

    If yes, should I do dot and dab or mechanical fixing?

    If not, what are the reasons why I should remove the existing plasterboard first?





    2. I'm hoping to put insulated plasterboard on the ceilings also because I can't insulate overhead due to an attic floor and I'm going to leave the existing ceiling as it is, i.e., put the insulated plasterboard onto it.

    What's the thickest insulated board I can use? (I'm hoping to use a 9.5 slab rather than a 12.5 Xtratherm one and my options are 26.5 mm, 34.5 mm or 54.5 mm).





    3. And to minimise cold bridging, should I do the walls or the ceiling first?

    Thanks.


Comments

  • Registered Users, Registered Users 2 Posts: 368 ✭✭Atlantic1


    Any takers for this one?


  • Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    Dot and dab may not take to your presumably (25+ year old ) decorated plasterboard and mechanical fix may prove difficult - the fixings like to pull the slabs tight to a solid base and the hollow of the existing dry lining may fight against that. There is the the risk that the existing air space of the existing dry ling system will now become very , very cold and will therefore trap interstitial condensation . If the existing boards are fixed onto timber battens ( very common spec in 70's - early 80's ) then they WILL rot.

    Be careful that you do not reduce your floor to ceiling height to less than 2400mm or you could find a future surveyor determining a non compliance with building regulations.

    Minimize cold bridging by ensuring a full insulation overlap between wall / ceiling , it doesn't really matter which is built first.


  • Registered Users, Registered Users 2 Posts: 368 ✭✭Atlantic1


    Thank you, Sinnerboy. Much appreciated.


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