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. Plywood shed flooring is usually 3/4 inch and OSB 5/8 inch thick.Click to see full answer. Also asked, what is the best flooring for a shed? Most Popular Storage Shed Floor Options Concrete Slab. The most durable of shed floors, concrete floor will hold up against just about anything you throw at it. Pressure-Treated Plywood. Wood Tongue and Groove Planks. Plastic. Pavers. Oriented Strand Board (OSB) Durability. Installation. One may also ask, is 11mm OSB OK for shed roof? For heavy duty roofing, you may want to opt for an 11mm tongue and groove roof, additional roof trusses can offer even more support for your shed roof. For an inexpensive, value option 9mm OSB can be used for your garden shed roof. In this manner, what kind of plywood should I use for a shed floor? The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. This type of plywood won’t sag when used on a 12 inches joist structure. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface.How do you weatherproof OSB?Soak the tip of your paintbrush in your sealer and begin brushing it over the surface and on the ends of the OSB pieces. Make sure you repeat this process on each side, not just where your cuts were made. Coat the pieces as they lay on the tarp, and then let the waterproofing sit to dry for 12 to 14 hours.

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