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Pumped insulation behind dry lining?

  • 17-10-2011 4:24pm
    #1
    pawdee
    Registered Users, Registered Users 2 Posts: 555 ✭✭✭


    Hi. Can anyone tell me whether it's a good idea to pump insulation into the void between my drylining and old stone walls? My house is about 100 years old with approx 400 mm thick stone walls with sand and cement render inside and out. About 15 years ago the whole house was drylined with metal studs and foil backed plasterboard. No insulation was put in at the time on the advice of an 'engineer' who reckoned it would cause condensation. I seem to remember hearing something about pumped insulation reacting with electrical wiring too. Anybody have any experience of this?


Comments

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


    pawdee wrote: »
    Hi.
    1. Can anyone tell me whether it's a good idea to pump insulation into the void between my drylining and old stone walls?
    2. My house is about 100 years old with approx 400 mm thick stone walls with sand and cement render inside and out. About 15 years ago the whole house was drylined with metal studs and foil backed plasterboard. No insulation was put in at the time on the advice of an 'engineer' who reckoned it would cause condensation.
    3. I seem to remember hearing something about pumped insulation reacting with electrical wiring too. Anybody have any experience of this?

    1. I don't think you should contemplate this as I'm not aware any suitable product on the market..
    2. as the engineer suggested, this is the major risk associated with insulating internally in an old building probably without a DPC. what you need is an arch or Eng with experience of old buildings to advise you. My preference is for insulating using breathable materials, that allow for any moisture to dissipate/dry-out but this only works where every layer down to the paint is breathable. the second option is for EWI but you can't just get 'any man with a van' to install it as the same breathable issues still apply.. the solution is often decide by the actual house situation etc and of course budget and what disruption can be tolerated
    3. yes this is a problem but associated with cavity wall poly based insulations, again there is no insulation I'm aware of that is suitable for what you have suggested.:)
    have a read here on a similar topic
    http://www.boards.ie/vbulletin/showthread.php?p=74483139#post74483139


  • #3
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    On the wiring, apart from the reaction issue, its good practice to put any cables in conduit before covering with insulation. Cables need air to keep cool, unless spec'ed otherwise


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Carlow52 wrote: »
    On the wiring, apart from the reaction issue, its good practice to put any cables in conduit before covering with insulation. Cables need air to keep cool, unless spec'ed otherwise
    how serious an issue is this? for instance i've just put 150mm over my wiring in that attic, out of genuine laziness really:)


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