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After researching and watching Celotex video guides I have started to build a flat roof to my extension. The roof is 7.2m long by 2.2m wide. The decking will be T&G 18mm OSB3, a VCL topped with 100mm of PUR insulation and a finishing layer of EPDM. There will be two roof lights on the roof. A contractor offering an estimate has said I must have another layer of 18mm OSB on top of the PUR. He also said I must only use OSB for the decking and that plywood was not 'allowed'. Celotex, and other guides, suggest that EPDM can be fixed directly to the PUR. Your comments on this issue would be welcome.