11 Best Of How Thick Should Plywood Be For A Shed Roof Best Images PNG. Dec 19 2018 If you want the shed to be waterproof its roof must be constructed just like any other roof -- a plywood decking covered with shingles or with composite or metal roofing. The recommended shed floor plywood thickness is 34 inch pressure-treated exterior-grade CDX plywood.
Even though plywood is more expensive and OSB stronger my recommendation for a shed roof is 58 or 34 construction-grade exterior rated CDX TG plywood. The lower the slope the more weight for snow load but less wind force. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface.
You might get by with 716 plywood but even that would be iffy.
Apr 05 2018 Ive never used commodity OSB on a roof but its probably fine in 58. Cant decide whether to use 18mm ply for the roof covered in felt or to use. Thickness and possibly in 12. In this case plywood should be a minimum of 38 inch thick.