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Thanks, I understand that, also , does anyone know why for dormer cheeks it's ok for bc to have celotex packed between joist but same can't be applied to ceiling ?

Thanks for you input here, but I think you have created a " cold deck" instead which technically needs to be vented now, is that right, warm deck didn't need any ventilation

It would go underside of joist

Thanks for your replay I was hoping that 25mm celotex over entire area would help with cold bridging issue through joist, also joist shrinkage - that's why it would have to be a very tight fit between joist , also 2" joist wouldn't shrink much in width but a fare bit in depth, if 2" joist...

Hi all, I have a question , perhaps someone here can help to answer it, I'm not a huge fan of warm decks as they take an additional 100mm plus to the roof thickness and in most cases high is very critical on build, what I was wondering , if let's say instead of fitting 120mm celotex you...