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Insulated Garage Roof

Discussion in 'Roofing and Guttering' started by ibruceuk, 11 Aug 2015.

  1. ibruceuk


    11 Jun 2005
    Thanks Received:
    United Kingdom

    We've recently moved into a new house and the garage is partially insulated in the roof, the walls are fully insulated but I don't think it's right looking at previous posts on here about insulating outbuildings.

    The insulation is up between the rafters and is kingspan type stuff. I've noticed in the bits that are insulation that in the recent hot weather the roof is 'leaking'. i.e. there must be a build up of condensation etc.

    Am I correct in thinking that there should be some ventilation between the roof and the insulation?

    If that is the case, how can I go about introducing such ventilation? As you can see from the picture the rafters/joists run to RSJ's at the end and so I can't just drop the insulation 50mm and then open up the ends as the ends are RSJ's. I can introduce a gap but how would I ventilate it?

    Would it be feasible to introduce a few holes in the joists to allow ventilation across them and then open up at the wall end, or is this likely not going to be enough?

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