x 47.75 in. Lee has over two decades of hands-on experience remodeling, fixing, and improving homes, and has been providing home improvement advice for over 12 years. Model #00021. Some experts suggest that 15/32-inch plywood should be standard if the underlying floor joists are spaced 16 inches apart or less, but slightly thicker 3/4-inch plywood should be used for joists spaced further apart. However, very few people are able to recognize this. Of the two most common subfloor materials, builders often debate which is best: plywood or OSB. Below is a guide to the building materials weights for typical supplies used during the construction of your walls, ceilings and floors. Plywood or OSB subflooring is installed over joists, the horizontal wood members that make up the skeleton of a wood floor frame. Select an approved adhesive for sub-flooring that is strong enough to keep its bond over the lifetime of the floor and elastic enough to allow for settling in the panels and joists. for pricing and availability. To read PDF files, you need the Adobe Acrobat Reader 6.0 or higher. Plywood subfloors should last as long as the house itself. Oriented strand board has many flat wood chips glued up together in a solid sheet. Because plywood is inherently a stiffer material with greater strength, it is a better choice as a subfloor under ceramic or stone tile. Local store prices may vary from those displayed. virtually impossible to fix a poor quality material or a low budget install. Subfloor sheets for both OSB and plywood come in 4 x 8 or 4 x 12 sheets. Any recommendations for type of screws ? AdvanTech Subflooring vs. OSB vs. Plywood. Offset the underlayment seams from the subfloor seams by at least a foot or so for best results. The National Wood Flooring Association advises that OSB sub-flooring panels be glued and fastened. Like plywood, OSB subfloors should last as long as the house itself. The layers will be clearly visible when the sheets are viewed from the edge, but when viewed from above the surface veneer makes the sheet look like solid wood. OSB weight is usually a bit less than its plywood counterpart. • Glue-down subfloor: 5/8 -inch plywood panels are glued in a staggered joint pattern directly to the slab. Do not 1/4 turn the underlayment direction from the subfloor. x 23.75 in. The shortest ones are 1 1/14 inches, while the longest are 3 inches. Although it's very unlikely that the subfloor material will be noticed, a plywood subfloor may be preferred by a few prospective homeowners. The sheets are anchored to the joists with nails or screws driven 6 inches apart, and they are secured to joists across the "field" of each sheet with screws or nails driven every 8 inches. OSB subfloor panels have tongue-and-groove edges that fit together and significantly reduce flex in the floor. OSB (oriented strand board) is a different form of sheet material. x 4 ft. x 9 ft. Square Edge Oriented Stand Board, Subfloor Membrane Panel 3/4 in. When it comes to selecting the support for your finished floors, typical plywood and traditional commodity oriented strand board (OSB) subflooring satisfy minimum standards in current building codes. x 47.75 in. OSB costs $3 to $5 less per panel when compared to plywood, so the cost savings when building an entire house is significant. C. Both CD EXPOSURE 1 plywood and OSB Exposure 1 subfloor panels are appropriate subflooring materials, but the proper thickness of the material will be determined by the 2 Common, kiln-dried to less than 15 percent moisture content. SDS. and even below the underlayment, in some cases. This panel delivers a solid, stable floor and easy to install with tongue and groove edge. ), 7/16 in. OSB is a heavier, more brittle material than plywood, and it has slightly less holding power for nails and screws. I'm finishing off a bonus room. All Rights Reserved. The rest use 2-3/8" air nails (clipped or FRH, depending on what kind of guns they run). 4 ft. x 8 ft. T&G Premium Subflooring, 7/16 in. The recommended thickness of the plywood subfloor is governed by the spacing of the joists. OSB can be used for subfloors, although it is not as common as CDX. The subfloor consists of sheet materials that are nailed or screwed to the joists to form the base for the underlayment and surface flooring material. OSB (oriented strand board) is made from large, flat chips arranged in as many as 50 layers, which are adhered together with glues and pressed into sheets. As a slightly more flexible material, OSB may flex underfoot when installed under carpet or sheet vinyl, but it is almost never noticed with ceramic tile or wood flooring. AdvanTech Subflooring vs. OSB vs. Plywood 5 Min Read. Where the panels are glued down, OSB also has slightly less holding power with construction adhesives. Plywood is more likely to resist permanent swelling, which is a good quality for a subfloor material. x 8 in. Oriented Strand Board, R+ Insulated Subfloor Panel 1 in. Sub-floor adhesives prevent uneven and squeaky floors. As a subfloor under solid hardwood, engineered hardwood and laminated flooring, OSB provides an enduring, rigid platform. Have to put down about 15 sheets 3/4" OSB. B. Solid-board subflooring should be ¾” x 51/ 2” (1” x 6” nominal), Group 1 dense softwoods, No. x 2 ft. x 4 ft.; Actual: 0.435 in. While the name may be unfamiliar, you probably recognize this material. OSB SUBFLOORS UNDER HARDWOOD FLOORINGOSB Subfloors Under Hardwood FlooringOriented Strand Board (OSB) is an engineered structural wood panel primarily used for floors, walls and roofs. The guys who have gotten neurotic about squeaks use 1¼"x#8 flooring screws and PL premium for a ¾" OSB subfloor sitting on TJI's. Plywood is made by gluing together multiple thin layers of solid wood at 90-degree angles and pressing them tightly as the glue dries to form a very strong structural sheet. At a major home improvement center, a 4 x 8-foot sheet of 23/32-inch OSB costs about $16.50. Get daily tips and tricks for making your best home. To avoid nail pops, pullouts, and shiners (nails that barely hit the joist), all of which … But plywood is a somewhat stronger material that performs better under very heavy flooring, such as ceramic or stone tile. This high-performance sub-floor is designed to help you avoid costly and time-consuming joint sanding. Item #902533. The Spruce uses cookies to provide you with a great user experience. Because it makes use of leftover wood material, OSB tends to be cheaper than plywood, and it is more uniform, since it has none of the knots and other defects that may be present in plywood. Many installers apply a bead of construction adhesive across each joist before laying the subfloor sheets down. A 4 x 8-foot sheet of 3/4-inch-thick subfloor-grade plywood sells for about $21.50 at home improvement centers. Oriented Strand Board, T&G Oriented Strand Board (Common: 23/32 in. There was no real choice in OSB then. The subfloor is always a structural layer of sheet good material—usually plywood or OSB, or occasionally particleboard. OSB comes in the same sizes as plywood subfloor sheets. Products shown as available are normally stocked but inventory levels cannot be guaranteed, For screen reader problems with this website, please call 1-800-430-3376 or text 38698 (standard carrier rates apply to texts), Building Supply Product Type: OSB Panel/Sheathing/Subflooring, Oriented Strand Board (Common: 7/16 in. Need Help? As subfloor materials, both plywood and OSB should last as long as the house itself if the subfloor has been properly installed. Both subfloor materials are installed the same way. Plywood is available in the same sizes as OSB. Because OSB has slightly less holding power for screws and nails, some builders like to space fasteners closer than they do with plywood. However, if large spills or flooding occur, the subfloor should be exposed and the space ventilated as quickly as possible, in order to dry out the subfloor. The type of OSB used for subfloors generally is made with tongue-and-groove edges (T & G). Both plywood and OSB will burn should a house fire break out. Because plywood is the stronger material, very observant home buyers may place a small premium on plywood subfloors.