I am about to put a roof on my extension its 4.5mtrs long (with the 25mm over hang each end) and 6mtrs wide. I am using 200mm x 75mm timbers straight onto the block work with DPC between. from the top down: EPDM rubber 18mm OSB3 sheet Vapor sheet 50mm air gap 150mm insulation Plaster board
my questions are do I need noggins and if so where and how thick? do I do them 120mm and at the bottom to keep the 50mm air gap? Should I put timber around the top of the block work or rest the timbers straight on them?
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