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Cold Flat Roof No Ventilation Problem

Discussion in 'Roofing and Guttering' started by rossbardon, 5 Mar 2011.

  1. rossbardon

    rossbardon

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    Location:
    Bedfordshire
    Country:
    United Kingdom
    I have recently brought a property which has a old conservatory / extension at the back with a flat roof. I want to put up a new plasterboard ceiling in this room to replace the cardboard tiles which are on the ceiling. Upon removing the tiles I have found:

    * Paper layer with one side film (looks like old radiator paper)?
    * Wool Insulation maybe 100mm thick
    * No ventilation!

    The gap between the end of the joists and the decking is 155mm (top of slope) to 105mm bottom end (bottom of slope).

    I now need to decide what is best to do.

    1) Do I add vents into the soffits for ventilation? But due to the limited joist size I would probably need to forfeit having any insulation.

    2) Or do I carry on with no ventilation and stuff it with insulation? (As it was already).

    The roof is NOT in bad order considering its age and lack of ventilation but I would like to do what I can to improve its life span and reduce potential problems for myself in the future.

    Advice gratefully welcomed!
     
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  3. noseall

    noseall

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    Location:
    Staffordshire
    Country:
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    Fill it to the brim with celotex/kinspan and seal up any air gaps, thus doing away with any air whatsoever.
     
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