Most builders use 15/32 cdx for the roof; it is an exterior-grade plywood with a thickness just under 1/2 inch. the floor needs to be more solid than the roof to support lawn maintenance equipment. 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.. Floor lay one 2.4 x 1.2 m sheet of plywood parallel to the joists. ensure that the platform is square by checking the diagonal measure, and that the edges of the plywood sheet align with the outside faces of the perimeter joists. how-to-build guide garden shed (contd) www.nzwood.co.nz � how-to-build garden shed 4 rafters.
Osb and plywood are both commonly sold in 4-by-8-foot sheets, but osb can be made in much larger panels, up to 8-by-24 feet. using larger osb panels can be an advantage when flooring a big or odd-size shed, reducing the number of joints in a floor.. I have a 24
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