You can say that plywood flooring is made up of multiple layers to make up a solid sandwich. The plywood becomes the new subfloor with the hardwood floor laying on top. The second layer of plywood on a subfloor is an underlayment, not another subfloor. If I decide to remove the chipboard all together, how thick of plywood subfloors will I need? For joist spans 16 inches or less, NWFA recommends minimum panel thickness of 5⁄8-inch plywood or 23⁄32-inch OSB; the building code requires 5⁄8-inch plywood or OSB. In this video you'll see some tips for plywood subfloor leveling: tools and equipment for this job and simple instructions on how to level plywood subfloor. (I'm thinking hardwood 18mm?) Cupped Hardwood – this can happen when the bottom of the hardwood picks up more moisture than the face of the hardwood. A wood subfloor should be OSB or plywood of 3/4″ or thicker for a hardwood floor installation. Q. This subflooring comes in a vast range of thickness. Plywood comes in a variety of thicknesses beginning at 18 inch and increasing to 1 inch. In most cases 4-by-8-foot sheets of particle board or plywood must be installed in preparation for the vinyl floor install. Plywood, or even OSB, has its strength running with its length. Proper installation of the subfloor and the hardwood flooring, along with the proper care of the floor after installation, will minimize any impact to floor performance or appearance.Subfloor Requirements Per the NWFAAcceptable Panel Subfloors: Truss/joist spacing will determine the minimum acceptable thickness of the panel subflooring.1. Plywood can usually span slight imperfections and waves in the concrete, but check to see each 4x8 sheet is level and the same height across the floor. What type of subfloor do I need for a 3/4″ solid wood? Do not 1/4 turn the underlayment direction from the subfloor. This thickness is related to wood veneers. You’ll need to drill through the wood and into the concrete to fasten it down. The most common form of wooden subfloor is plywood. The difference between the moisture content of the wood subfloor and the hardwood flooring must not exceed 4%. Don't skimp on the sub-floor - it's the subfloor which carries the load, not whatever fancy stuff you stick on top of it. Your new layer of underlayment needs to be perpendicular to the joists just like the subfloor is. In addition, Exotic hardwood flooring or "Iron woods" do best over a stronger, stiffer, sturdier plywood base for a secure nail hold. Especially, when it comes to backing up hardwood flooring, the cheap ones fail to do their jobs. Plywood used for subflooring panels is at least 3/4 inch thick. For engineered hardwood flooring, check the manufacturers requirements since they may vary based on hardwood species, other material components, strip width and thickness. The National Wood Flooring Association (NWFA) recommends that flooring installers measure the MC of the subfloor and the joists first. First Step 630-Square Foot Roll Underlayment would be the best option. Plywood subfloor thickness for tile flooring. Plywood allows for a much better build-up with lower undulations in the subfloor. Measure carefully to ensure that the plywood is an appropriate fit. Plywood subfloors can generally handle any type of flooring material since they are less porous than concrete slabs. The broadness of plywood panels depends on the distance between floor joists. NOFMA says the minimum acceptable thickness of a plywood subfloor is 5/8" going over joists 16" OC. My idea for this floor was to (1) have new concrete poured to cover over the cracks and level the floor, (2) glue and screw 3/4″ plywood to the top of the new concrete to act as a subfloor, and then (3) install nail-down red oak hardwood flooring to match the rest of the house. If you do replace your subfloor with 3/4" T&G CDX, you won't need an underlayment and you can maintain a nominal elevation of flooring throughout. Hi, I'm considering plywood for flooring (the main floor - not subfloor) throughout the ground floor of our new house. Step 2: My basement is dry most of times/yrs. Cover your existing subfloor area where new vinyl flooring will be installed with 1/4-inch plywood. Q: I am planning on installing 3/4′ maple hardwood floors.Currently the subfloor is chipboard. Optional, if you already have a plywood subfloor, and the subfloor is smooth and level, then you may not need an underlayment beneath the hardwood floor. If your plywood subfloor is too thin, it might not cope with the load, and it might creak or squeak when you walk on it. Never heard of flooring being done with anything thinner. Prior to installing any finished flooring, it is important to remember: Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. One of the big considerations when installing different types of flooring in the home is getting the finished elevations to match. Installation factors to consider The most common way a solid hardwood floor is installed is by means of nailing or stapling the boards directly to the subfloor. The thicknesses are as follows. A high quality engineered floor will look/last the same as a solid wood. A one and half inch cleat will go completely through the half inch plywood and stick out about a 10th of a inch. Most brands of hardwood flooring can be installed over concrete when plywood or OSB subflooring panels have been installed over the concrete slab but it’s wise to consult the manufacturer for any specific installation requirements. Three-fourth-inch sheets are the standard in plywood subfloors. The thickness needed for subflooring depends on the type of floor that will go on top and the primary purpose for the subfloor. It comes in various thickness but for our comparison we will consider 18mm thick plywood. Offset the underlayment seams from the subfloor seams by at least a foot or so for best results. The subfloor moisture level must not exceed 12%. A: If you are installing solid (3/4″) hardwood on grade with a concrete substrate, the thickness of the plywood needs to be ¾; we utilize 5 ply CDX. Usually manufactured in 4 by 8 foot sheets plywood panels. If you are utilizing lightweight concrete plywood or osb subflooring panels will have to be installed. Typically when installing over concrete slab, you float an engineered floor. Should I go for hardwood ply or softwood ply, and any particular grade and thickness? You can have these pieces cut by a lumber yard or use a circular saw on the job site. The standard dimensions are 1220mm x 2440mm or 4 ft by 8 ft. So can hardwood be installed over OSB, Oriented Strand Board? A weakened plywood subfloor can cause the hardwood to cup, linoleum to bubble and tiles to crack. The slab should be flat prior to flooring and subflooring installation (usually 1/8” in a 10-foot radius). For hardwood products greater … The absolute minimum thickness you can use on 400mm/16in centres is 18mm. Plywood is the most common type of subflooring. Still, testing plywood for moisture levels has increased importance for hardwood flooring. The key to a beautiful, long-lasting hardwood or laminate floor is a well-prepared subfloor. In fact, the NWFA recommends a minimum of 20 moisture meter readings for every 1,000 square feet [iii]. These sheets install directly over floor joists, which cross the floor every 12 to 16 inches to provide the support necessary for the flooring surface. Right now, I have 3/4 TG hardwood, which is not in the best shape, over a 2.5" wide x 3/4" inch think plank subfloor, which runs perpendicular to the joists (2x10, 16 oc). When NWFA Guidelines minimums are not met, the recommendations are to overlay the existing subfloor material with a 1⁄2-inch panel product or add structural support from below. Solid Hardwood, Engineered and Laminate Flooring - plywood for basement subfloor - I am finishing my 1600sqft basement. They are normally set in a bed of adhesive, which can allow for a nice solid platform for the flooring install. Vinyl flooring is usually not installed directly over the subfloor in residential applications. Plywood is available in many thicknesses (1/8”, 1/4”, 11/32”, 15/32”, 19/32”, 23/32” and 1 1/8”). Plywood subfloor thickness for hardwood flooring. Do this by multiplying the room’s length by its width. For hardwood finish flooring which average about 38 inch to 34 inch in thickness 12 inch to 34 inch thick plywood is the preferred subfloor though there are a variety of grades designed for specific applications. Yes, if using OSB select panels rated PS2 min 3/4" thick, recommended for most hardwood flooring. The floor joists beneath a plywood subfloor can be a range of heights, but 6 inches is a standard. The subfloor and flooring should be tested with an appropriate moisture meter. Plywood comes in a variety of thicknesses, beginning at 1/8 inch and increasing to 1 inch. Thanks, Tom. The plywood not only acts as a barrier between the concrete and the hardwood, it also is where the nails/staples adhere. Treated Chipboard - it is made by bonding together wood particles (chips) with an adhesive under heat and pressure to form a rigid board with a relatively smooth surface. A proper subfloor will be the unsung hero of your solid hardwood investment, while the wrong subfloor will cause you problems. Particle board and chipboard are unacceptable for solid hardwood installations, but may be used in an engineered flooring … We also go over questions regarding Particle Board and Installing New Hardwood Flooring over Old Wood Flooring. – diceless Jan 19 '15 at 20:02 Plywood. Before you install your plywood subfloor, first calculate the room’s square footage to find out how much flooring you’ll need to buy. Looking for the best underlayment for hardwood flooring? Considering buying sheets and cutting it into floorboards & treating it myself. If your joists were closer, say 12" OC, then the 1/2" plywood would acceptable, IMO. For heavy flooring, such as hard tiles the subfloor should be thick plywood, but for soft flooring (vinyl, carpet and soft tiles) thin plywood or even hardboard with the smooth side facing up will be sufficient. I … Again, the dry hardwood is installed on top of a wet subfloor and the bottom of the hardwood picks up the extra moisture from the subfloor and expands leading to cupping or even buckling the hardwood off the subfloor. Am I mad?! Plywood Vs Osb Subflooring The Pros And Cons Of Each Bob Vila. The National Wood Flooring Association recommends a minimum plywood panel thickness of 7/8-inch for joist spans of 19.2 to 24 inches, and a minimum plywood panel thickness of 5/8-inch for joist spans of 16 inches or less. What is the minimum thickness of plywood needed to be applied for the hardwood to install properly? Other underlayments may disappoint you.

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