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Housing - Renovation: Insulation

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  1.  
    • CommentAuthorRogerward
    • CommentTimeNov 5th 2007
     
    I have a small room over the garage with a sloping roof that I wish to convert into an ensuite bathroom. The roof built in 1938 is constructed with "tarred paper" between the rafters and the external concrete tiles. The rafters are open internally with no insulation.

    For insulation I wish to put Rockwool flexi slabs between the rafters, covered by plasterboard. I am concerned about interstitial condensation. Should I put a non-porous membrane such as polythene between the rafters and the plasterboard, or does the whole idea risk damp attack to the rafters?

    Comments would be very welcome.
  2.  
    Remember to leave an air-gap of about 50mm between the back of the tiles and anything else - in this case your insulation. This may mean you can only put 1 - 2 inches of insul'n in, depending on your rafter depth. I 'beefed up' the rafetrs so I could get more in. You could underdraw with an insulated pl'bd, too. Use a vapour barrier, for sure.

    Nick
    • CommentAuthortony
    • CommentTimeNov 5th 2007
     
    Sounds like controlled works to me and if/when you sell it could become an expensive problem if not approved and passed.
    • CommentAuthorRogerward
    • CommentTimeNov 6th 2007
     
    Many thanks Nick & Tony. I will folow your advice.

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