Plywood or OSB Roof Decks.
Plywood or OSB Roof Decks.
To theMarietta Georgia Roofing ContractorPlywood and oriented strand roof board decking details are to use plywood or OSB recommended by the APA. APA is The Engineered Wood Association, which sets standards for acceptable plywood and OSB (oriented strand board). APA is printed on accepted decking for roofs. Minimum of 3/8 thick to meet the fire rating requirements (UL). The thicker decks make for stronger and higher load bearing decks. Keeping 1/8 separation at rafters, plywood or OSB jammed together at rafter seams will make the plywood buckle. Concerning OSB and local Building Codes, there are local and state building codes that do not allow the use of OSB as roof decking. You should always adhere and abide by the local codes. Treated or fireproofed plywood and lumber: Wood treated with formaldehyde and other chemicals have the potential to damage roofing materials and metal components.
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