loft insulation - how much for 135mm gap?

Discussion in 'Builders' Talk' started by action711, Nov 21, 2013.

  1. action711

    action711 New Member

    I have a garage with a flat roof and I'm going to make a ceiling by screwing plasterboard sheets to the joists.

    This will leave a gap between the plasterboards and roof of 135mm.

    I have loads of spare loft insulation and was going to pack it in that gap.

    But then I though should I leave any air flow?

    Advice please!
     

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