Siding. exterior siding plywood comes in 3/8- and 5/8-inch-thick sheets with a variety of surface patterns. builders often call the siding t1-11, which refers to its design.. Pressure-treated plywood is an exterior-grade plywood that will resist rot and decay for a lifetime. it is the preferred flooring material for an outdoor shed.. That leaves you with 2 choices, the untreated 3/4" plywood or pressure treated 1/2" plywood. if it were my shed, and i'd be using it frequently, doubling up the 1/2" treated plywood would be the best option. but it doesn't end with simply that recommendation..
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