My standard floors are strong enough for almost any application. I have 2x6 pressure treated joists on 16" center. I am trying to determine a flooring choice. The most common thickness of plywood is 1/2-inch, but plywood thickness can range from 1/8-inch to 3/4-inches. Many garden or storage shed floors will work just fine without a floor covering, whether they are timber planks, OSB or plywood. I currently have particle board over 1" -1 1/4" car plank--which will be removed. 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. Every 8" on the edges and 12" in the center. First time builder. Thats fine so far... so then I look at Marine Plywood for the flooring. Re: 1/2" plywood subfloor Nearly every house I framed in the 70s and early 80s was 1/2" subfloor with 5/8 particle board over in the carpet areas and 5/8" ULCX ply at the vinyl areas. 3x2 or 4x2 for floor joists, I go 450mm centres for joists, depends on shed use, 18mm exterior ply, you can get 18mm tanalised plywood which I'm using for my shed floor. Can I put more plywood on top of my plywood shed floor to strengthen it? Pressure-Treated Lumber. You concrete blocks are the foundation. The nail tip must not exceed the width of the floor joist it is being driven into. This will also help eliminate the hollow sound and feel the floor will have over the foam. Exterior siding plywood comes in 3/8- and 5/8-inch-thick sheets with a variety of surface patterns. The pattern may be solid or include vertical grooves to give the impression of vertical slats. If the construction is not done properly, a multitude of problems will and can occur over the life of your shed. This wood is just like regular framing lumber, except it has been factory … Plywood is necessary for the roof and floor, but not always for the siding. The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. https://www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, https://www.diychatroom.com/members/kakosh-577841/albums/foundation/, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The sheets are generally 4 … © Copyright 2020 Hearst Communications, Inc. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface. Then you have a much wider choice of shed floor coverings. Having a sturdy shed floor is crucial to maximizing the life of your shed. Also how far apart should my screws be when installing the plywood. With concrete - I build it four inches above grade and use large pavers to bridge the gap with ground level (wheels on outdoor equipment can take a one inch elevation change without problem). It adds proven performance and durability to … x 4 ft. x 8 ft. RTD Sheathing Syp Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction, and every piece meets the highest grading standards for strength and appearance. Lastly, are dichromate (yellow zinc-ish) screws appropriate for … I'd love some suggestions on how to insulate the floor from the inside. Plytanium 19/32 x 4 x 8 Pine Sheathing Plywood (Shop Plytanium 19/32 x 4 x 8 Pine Sheathing Plywood at Lowes.com) $22; Plytanium 23/32 x 4 x 8 Pine Sanded Plywood (Shop Plytanium 23/32 x 4 x 8 Pine Sanded Plywood at Lowes.com) $34 @ Local Lumber Yards. Do not use flat bottom gables with scissor trusses. I used pressured-treated wood and 1/2" thick plywood for the foundation. It is on a hill, so the back is very close to the ground (too low to get under to insulate from the outside). First time builder. On the shed walls use exterior rated 1/2 inch plywood for a waterproof finished look, and 3/4 inch CDX plywood on the roof for strength. For a better experience, please enable JavaScript in your browser before proceeding. All are hard wearing and suitable for occasional use and storage type applications. I will also add two more concrete bases. It only comes in 1220x2440 cuts. Can I use this material as studs when building the shed? Use sturdy, 3/4-inch-thick exterior plywood for the floor. You most likely can, but be aware that if the first “ply” has moisture or rot in it, it will telegraph to the new layer very quickly. I am looking at 3 options: Pressue Treated 1/2" plywood. Since your 1/2" plywood is several decades old, I wouldn't even try to glue to it, or use it as support for a second layer of plywood. As for the joists, do you think I should replace 2x4s with 2x6s (or 2x8)s given the size of shed 8x12? Helping You to Do It Yourself! The floor needs to be more solid than the roof to support lawn maintenance equipment and people. JavaScript is disabled. This just specifies what a particular end use a piece of plywood was designed for. Quick Navigation [ show] Don't bother with glue, since you'd only be gluing to the 1/2" plywood, and use deck screws every 6" into the joists. Use pressure treated 3/4 inch construction grade exterior plywood for the floor. You can paint the floor of your shed, which will seal and protect the floor, prevent splintering and improve the look of the shed. In case you were wondering, the stiffness increase being cubed with increases in thickness also applies to the depth of the joists. Sure, I do it all the time in sheds, or other areas where you don’t expect to walk through a lot. I was thinking of making the shed 3m x 5m. Building a shed isn't as involved as building a house or even a garage, but it still needs a roof, siding and floor. Here are just a few: Initial construction will be harder for the rest of your shed if you don't build the floor right. Unless you glue the two pieces of 1/2 inch plywood together, you do not have the same strength as one piece of 1 inch plywood. The problem with a wood floor is that it raises the shed height annoying high and requires a ramp if you want to roll things in/out. This type of plywood won’t sag when used on a 12 inches joist structure. These joists are resting on concrete blocks. Thanks everyone for your comments. Your "runners" would be called floor joists. If you go with 2 layers of the 1/2 inch (and I would expect the floor joists to be spaced far enough apart you would need to use 2 layers), youve got 2 choices in how to apply that second layer. and 4×4 skids at 48 inch O.C that I have been parking 2 full sized pickups on for the last 5 years, and the floor is still sturdy. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. How can I make the floor stronger? Hello everyone- Got a question about the thickness of the plywood for a shed 8x12 feet. If you live in an especially wet area or termite prone area you could make the entire floor out of pressure treated wood. When you opt for plywood siding, use T1-11. Breathable membrane look on Ebay might find a bargain. It comes in 3/4-, 5/8- and 1/2-inch thicknesses. Door can become warped. It does not feel very sturdy, and I realized I should have used 3/4" thick plywood. 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. I will be screwing the floor down using 2 inch GRK screws, which are simply the best. It’s solid, won’t sag, and protects the substructure and is easy to sweep. Use thicker plywood, glue the thinner pieces together very very well, add floor joists and use minimum 2 x 6 for floor joists. What Kind of Wood to Use on an Outdoor Shed? As a landscape builder, he helped establish two gardening companies. Builders often call the siding T1-11, which refers to its design. I am constructing a 12x16 shed. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Should I use 1/2" or 5/8" plywood as a subfloor over my car plank. Foolishly, the tile guys wanted to mud base over just the 1/2" so the tile wasn't so much higher tha the hallway and bedroom carpets. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. 15 ¼ inch to the first one and 16 inches to the end. You have two pieces of wood sliding over each other. I think treated wood has chemicals injected so is it safe to use this material for the shed? I live in the desert so we use untreated wood in our floors above the 4×4 skids.. A common mistake for a metal shed floor that will make it leak Unreated 3/4" plywood. Now that you've provided more information, the bounce that you feel is likely more because the the 2x4s are spanning 8'. How Thick Is the Floor Between Two Levels? Step 4: Cut And Fasten Plywood Sheets To The Frame. Is Exterior Plywood Good for a Porch Floor? Appearance stamps on plywood range from cabinet-grade (A) to construction grade (C and D). – Scott Ramboz Feb 21 '17 at 16:35 I had a large garage at a previous residence (28' x 36') that had a rafter truss construction that allowed for a robust standup space as an "attic". 7/16" OSB ( This option will be … In fact, I would just ignore it completely, and install a layer of 3/4" T&G plywood over the top. Floor Joist Plate Layout. It sounds like you do, but you don't. You’ll also need to cut a small area off the ends of each sheet of plywood. Building Paper Between Layers of Flooring, The Difference Between Wood Composite, Veneer and Laminate, Popular Mechanics: 10 Smart Tips When Building a Shed, My Storage Shed: How to Build a Storage Shed. Let me try to attach a picture, hopefully you can see. I have 10 treated 2x4s and three plywood pieces (4x8) 1/2" thick. Beside CDX, you can also find better grades, such as ABX, ACX and even BCX. what do you have under the plywood—is there anything between the 4x4 perimeter? 2 x 8 better and 2 x 10 more than adequate for this small shop. Use 1/2-inch pressure-treated plywood in a light-duty shed. Its surface is usually textured to resemble rough-sawn lumber. i.e. Use T&G and screw through the foam and the into original floor to keep the large sheets flat. Roof and Floor 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. Since anyone using plywood as sheathing will usually use 1/2" (also 2/3rds of a perm), according to code, all sheathing is a Type II vapour retarder, the same classification given to 6 … Tool shed floors are usually made of rough, inexpensive wood, such as plywood. In addition to the above two classifications, plywood is also rated as Sheathing, Stud I-Floor, and siding. 23/32 in. A plywood subfloor generally uses 1/2-inch to 3/4-inch-thick sheets of plywood that have one rough side (which faces down) and one smooth side, which faces up. For your install, plywood will work fine. I have about 4 inches before the door won't close! House floor joists are generally about 8 to 10 inches wide, so nail length is not an issue. The surface layer of wood-faced T1-11 may be made of yellow pine or fir. However many sheds are used for much more than utility purposes. I can see the issue with gaining 1/2 inch of height, but the plus would be that floor would be pretty strong. We do this so the plywood will fit on the center of the joist. I have a 24×20 shed (garage) floor built with 2×6’s at 16 inch O.C. 1/2" plywood shouldn't give much with supports at 16" centers, but the 2x4s will flex quite a bit at that span. I used three sheets of ¾ inch (or 23/32) thick, 4 x 8 foot pressure-treated plywood for the floor. Most builders use 15/32 CDX for the roof; it is an exterior-grade plywood with a thickness just under 1/2 inch. 3/4" Sturd-I-Floor $31; 1/2 … Then you can either cover the floor with 3/4 inch CDX plywood or 1/2″ OSB. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Step 2] Layout your 2×6 box joists as per drawing. Exterior plywood carries an X stamp, which identifies it as suitable for use outdoors. Choose paint made for exterior wood floors or decks. OK, so I draw how the Plywood will fit on various configurations of the joists.. and its SLIGHLTY off by a tiny fraction in each way I can think of. Windows can leak. Lower-quality paper and hardboard-faced T1-11 also is available. Then I put the plywood as a floor. I would say that you build a floor frame on concrete blocks that you used as a foundation. I'm turning my 130 square foot tool shed into a small livable room and the floor is plywood on floor joists. I'm not sure on the framing system, so I won't comment on what you need to do there. It usually requires the supporting joists be placed at 8 or 12 inches on center (apart). Use a 3-16 inch-head ring shank nail to hold plywood underlayment for a subfloor in place. I rebuilt the foundation with these changes and added pictures to the album. I placed the foundation on concrete blocks, with 4x4 sides and 4x4 runners. Using larger OSB panels can be an advantage when flooring a big or odd-size shed, reducing the number of joints in a floor. If you are paying full retail for the 1/2 inch ply, then you could actually end up spending more for it than the standard 3/4inch plywood. So, 2x6 joists will be nearly 4 times stiffer than the 2x4 joists (and nearly 2.5 times stronger). Hello everyone- Got a question about the thickness of the plywood for a shed 8x12 feet. 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