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How-to-install-epdm-roof-system, osb and ply gaps – leave a 3mm gap between all edges of any 8 x 4 board if the roof is very large or unusually long, check that you don’t need expansion breaks as well.. when a roof is abutting a wall at the perimeter of the roof, allow 2mm per meter for the distance that the roof protrudes from the wall, for expansion purposes.. New flat roof installation in england - duration: 5:39. stevensidwell1 599,184 views. 5:39. is an epdm rubber roof strong enough to walk on? - duration: 6:10. steve roofer 90,156 views.