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OSB is easily identifiable by its characteristic wood strands. Oriented strand board (OSB), also known as flakeboard, sterling board and aspenite in British English, is a type of engineered lumber similar to particle board, formed by adding adhesives and then compressing layers of wood strands (flakes) in specific orientations. It was invented by Armin Elmendorf in California in 1963.
There's no price savings at all using Struct 1 OSB versus Struct 1 CDX plywood , but there's a big difference in the price for CDX 5 ply plywood versus OSB Struct 2. SBE Builders will only use CDX plywood or OSB that has a APA rated sheathing stamp with a EXPOSURE 1 stamp. This APA stamp guarantees that waterproof resins and glues were used to bond the CDX plywood or OSB to the wood fibers. EXPOSURE 1 CDX plywood and OSB are made to withstand repeated rainfall with little or no damage during a normal time frame construction project. However, the creep - edge swelling of OSB does pose problems when OSB is used for subfloors that receive ceramic title as a finished floor.