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Insulation Problem

Discussion in 'Building' started by alex1269, 1 Feb 2013.

  1. alex1269

    alex1269

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    Hi Guys,

    I have built an extension on top of a single storey ground floor extension. The original extension only had a 50mm cavity so the new build has the same. My building inspector has told me that because the cavity is only 50mm then i must fit plasterboard with a 50mm insulation. My question :-
    Is there anything else i can use that is thinner that will satisfy the inspector?

    Thanks
     
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  3. noseall

    noseall

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    Unlikely.

    When we set out brick/block-work for an extension, customers always comment on the size (100mm) of the cavities, giving the overall thickness of new walls in excess of 300mm.

    I tell them you can have smaller cavities if you wish but you pay for that with insulation internally, thus bringing the wall up to the same thickness. There is no magic wand i'm afraid.

    You could have your building designer look at your heat loss calculations and see if he can come up with a way of bolstering maybe the loft insulation in lieu of say thinner or zero insulation on the walls.

    Whenever we are faced with your situation (thicker walls going on to of thinner walls below) we always look at ways of achieving a full 100mm cavity in order to avoid fitting insulation onto the inner face of the internal wall. Having insulation on the inside throws up all kinds of fixing problems later on.

    Especially if you were say fitting a kitchen! Nightmare!
     
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