Moisture also affects the strength of plywood; exterior-glued plywood can be used outdoors, but it works best when the moisture content remains low. The 3/4 inch thick plywood is sturdy. There are a few types of plywood for shed floors, from 5/8 inch t/g standard sheeting, OSB types and pressure treated plywood. 4 x $40 = $160. We're planning on getting 2 nigi does, possibly 3. If you see this on your shed floor let it remind you that you bought the best. It will also protect the floor structure from moisture damage and rot. Both of them are great for roofing. It also makes the shed a very permanent structure. Plywood vs. OSB (Oriented Strand Board): Major Differences . That means I’ll need 13 for joists and 2 more for the sides. It is recommended for areas of heavy use (storage of lawn mowers, shovels, sledges, etc.). I stay away from tongue and groove as it leaves a gap that collects dirt. It is stronger than plywood of the same thickness and is available in sheets up to 8 feet by 24 feet – great for larger uses. If you ever want to tear it down or move it, you’d have several tons of material to get rid of. The best plywood for installing under flooring may not be plywood at all. While plywood has been a top choice among homeowners for furnishing home interiors, a variety of alternatives have sprung up offering a cheaper price, better appearance, etc. Although there are many types of plywood to choose from, by factoring in use, it is easy to make a decision. The bad part is that durable and cheap plywood loves to splinter. We’ll build it with a grid of 12 deck blocks, so the weight is well distributed and it’s less likely to sink to one side. Softwood plywood is as strong as pressure treated plywood of the same dimensions. If you decide to use plywood, it too should be covered, stained or painted. One of the best ways to seal your concrete shed floor, spruce it up, and make it look amazing is to use an epoxy coating. Using Oriented Strand Board is a tested way of reducing costs for building your shed roof, walls and floor Using Oriented Strand Board is a tested way of reducing costs for building your shed. Be aware that stain and paint don’t always adhere to board, and cut edges tend to flake more easily. It usually requires the supporting joists be placed at 8 or 12 inches on center (apart). The shed is a lifted a few inches and over gravel. Plywood and chipboard are completely different; so to say which is best would be foolish. I used three sheets of ¾ inch (or 23/32) thick, 4 x 8 foot pressure-treated plywood for the floor. With pressure-treated joists spaced 12 inches apart, this floor can last for 20 years or more. Absolutely. The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. Step 4: Cut And Fasten Plywood Sheets To The Frame. This will get you in the ballpark though. 12’ long pressure treated 2×6’s are about $13 each in my area. If the shed is for heavier storage, then pressure treated 3/4 inch exterior-grade CDX plywood is the best. Treated Plywood. Dimension lumber doesn’t have the measurements by which it is sold. Using larger OSB panels can be an advantage when flooring a big or odd-size shed, reducing the number of joints in a floor. http://www.AsktheBuilder.com founder, Tim Carter, shows how to layout the first piece of plywood for a DIY shed floor. Hardwood. How does this translate to shed flooring? I’ve used H-Clips, but they leave a gap in the roof deck that insects and moisture seem to find. Plywood is widely utilised in the lining of sheds and race ways, to provide a smooth covering to a floor or as a general "patch up" material around the home and farm. Being pressure treated on top of this will make the floor last longer. 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