Cold deck flat roof

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18 Aug 2010
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Hi there, could anybody kindly help with this?

I've read that if you have a cold deck roof you must provide ventilation to prevent condensation.

So I have a question about two different kinds of flat cold deck roofs

1) Cold deck flat loft conversion dormer roof. So there is a flat roof and directly below it living space. How does one provide ventilation to this?

2) A cold deck flat roof on the first floor. So this will still have a loft space underneath the roof. If you insulate between the joists of the flat roof and also insulate between the ceiling joists of the room below is it still termed a cold deck?

Many thanks
 
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