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Retro- fitting insulated plasterboards to rafters

  • 02-03-2011 11:22pm
    #1
    rustynutz
    Registered Users, Registered Users 2 Posts: 797 ✭✭✭


    Hi all, I built a dormer house in 2004. At the time when insulating upstairs I just used 100mm (rafter lock I think) insulation between my rafters covered with 12mm plasterboard. I am only now finishing upstairs (rapidly expanding family) of the house as it wasn't needed before this (2 bedrooms downstairs) so I am considering fitting either a 38mm or 50mm insulated board over the existing skimmed plasterboard, I have a couple of questions:

    1. Will I have problems with condensation etc. by fitting the board over the skimmed plasterboard?, I really would rather not strip the existing drywall.

    2. Is this worth doing at all, as in will I notice a difference, the house doesn't seem cold?


Comments

  • #2
    mickdw
    Registered Users, Registered Users 2 Posts: 23,688 ✭✭✭✭mickdw


    How is your house upstairs for draughts? Dormer houses if not build with great care can have wind literally running through the upstairs part. This would be a greater concern than increasing the insulation if you have this problem.


  • #3
    rustynutz
    Registered Users, Registered Users 2 Posts: 797 ✭✭✭rustynutz


    mickdw wrote: »
    How is your house upstairs for draughts? Dormer houses if not build with great care can have wind literally running through the upstairs part. This would be a greater concern than increasing the insulation if you have this problem.

    I'm wondering is there any steps I can take at this (late!) stage to try and seal upstairs better? I'm trying to do as much as I can now before I start decorating upstairs.


  • #4
    rustynutz
    Registered Users, Registered Users 2 Posts: 797 ✭✭✭rustynutz


    Anyone?


  • #5
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    in the absence of exactly what kind of dormer u have and how much of the slope is accessible from inside, I would strip off the slates and the 'felt' : add a layer of woodfibre insulation and re-roof, making roof airtight/breathable in the process


  • #6
    rustynutz
    Registered Users, Registered Users 2 Posts: 797 ✭✭✭rustynutz


    Carlow52 wrote: »
    in the absence of exactly what kind of dormer u have and how much of the slope is accessible from inside, I would strip off the slates and the 'felt' : add a layer of woodfibre insulation and re-roof, making roof airtight/breathable in the process

    :( Don't think I want to go down that route, the thoughts of taking all the slate off again ....... I have access to the attic above the ceilings upstairs as well as access to behind the dwarf wall so my plan was to beef up insulation here from behind with possibly a 50mm xtratherm under rafters only, straight over the skimmed existing plasterboard, can anyone see this causing problems?


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