Workshop roof with insualtion

30 Dec 2008
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United Kingdom
I'm building a block workshop at the end of the garden. It'll be a workshop for me now but maybe longer term it'll become a home office or other use so I was thinking I might insulate the roof now for the sake of a few extra quid. Might help with condensation too as the top deck will be steel. I can get OSB3 cheaply so planning to use that unless directed otherwise.

Its a 4.5 m span, 5.5 degree pent roof. Top to bottom I'm thinking:
Profile steel roofing sheets
Layer of 18mm OSB3 or cross battens to mount roof panels to (which is best? or both/neither?)
Celotex or similar
Vapour control layer
Layer of 18mm OSB3

How does that sound? Anything missing or not needed?
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