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Advice on dry-lining insulation

  • 13-02-2010 4:52pm
    #1
    The Barrier
    Registered Users Posts: 24 ✭


    I'm currently in the process of constructing a new build house. I'm looking for advice on dry-lining the house. I have left a 120 mls gap in the cavity walls and am filling it with 80mls rigid high density insulation. I was thinking of dry-lining the inside of the exterior walls with 38mls (25 of insulation and 12 of plaster board). Should I go for 50mls of dry-lining insulation (38mls insulation and 12 plasterbosrd)? Would I gain anything from it? Would the cost justify me doing it? I would appreciate any guidance.


Comments

  • #2
    imitation
    Registered Users, Registered Users 2 Posts: 1,815 ✭✭✭imitation


    My engineer has recommended this route to me, I dont have the U values to hand for comparison, but the dry lining should offer a bit more insulation. I got the impression that in my case I needed it to hit the A3 rating.

    It however adds a new mind boggling dimension to your insulation, thermal mass. Basically, blockwork will absorb some heat and re emit it, hopefully with your cavity insulation stopping it from being emitted outside (Think of the sun shining in the windows during the day and the warm blocks releasing heat during the evenings). If you dry line you`ll be adding a thermally resistive layer to your wall, so they will absorb and release less heat.

    I`m not too sure if its even worth getting your knickers in a twist about it in Ireland, but I think it basically boils down if you want a room to heat up quickly & to hold warm air(Dry lining) or to retain heat, its probably advantageous with underfloor heating, and possibly during the summer where the thermal mass would help regulate temperatures.

    You`ll find plenty of arguments for and against it, but thats the joy of self building !


  • #3
    recedite
    Closed Accounts Posts: 13,992 ✭✭✭✭recedite


    Generally speaking its better to have all the insulation in one layer, but as there is a small heat loss through wall ties and gaps in the main layer, then the 38mm would be of some use. Before going to 50mm think about diminishing returns and also loss of floor area, imo not worth it.

    <SNIP>



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