Hello, I am about to insulate my flat garage roof, the plan was to leave a 50mm air gap, then 170mm of fibreglass roll or sheet, then dpc as a vapour barrier and then plaster board. However the joists are approx 30cm apart from eash other do I need to drill into the sofits of the garage, between each pair of joists for the ventilation required, as the only air bricks I have are down the wall, and hidden behind my wall insulation of brick, semi pearmeable membrame, fibre glass, non pearmeable membrane and plasterboard ? I am more than certain my roof is not air tight, however I want to make sure I have adequate ventilation to stop condensation many thanks mark
Garage roof insulation ventilation
- Thread starter mdnorth
- Start date
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woody apologies for not replying sooner I didn't realise I could do this every thing I'd read said a 50cm air gap but does make sense not to have it at all cheers mark
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