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Thanks very much for this, it is indeed OSB (judging by picis on the web) but I am not sure how to post the photos to here. I should have mentioned in my original post that these panels are being laid over battons nailed to the old concrete roof and this creates a 1/2 - 3/4" sealed air gap...

Having had a contractor recover a flat concrete roof on an outbuilding with a felt covered timber frame I am now convinced that they have used different timer to that specified I am told that the timber panels on one section -which looks like crushed bark chippings (sorry no expert ) -is in...