Sean M Posted July 9, 2019 Share Posted July 9, 2019 Hi This has probably been asked before but cannot find a thread. I am constructing a warm deck flat roof with joists at 600mm ctrs. I am putting 120mm celotex on with 18mm OSB3 on the top for a GRP system. Can anybody tell me the thickness of board I need to use for the lower deck that sits on the joists please. Is 9mm OSB3 too thin for the base deck? Cheers in advance. Sean Link to comment Share on other sites More sharing options...
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