If you must install parallel to the existing floor, lay a minimum of 3⁄8-inch plywood over the top to increase stability. Doing this will help minimize any movement within the wood flooring later. can laminate flooring be laid over thermoply? And if the old flooring should ever become loose it could affect the new flooring installed over it. Any fix up to the existing sub-floor, like squeaks, humps, dips have to be done before adding another layer of plywood (if necessary). Doing this will also allow you to run your new wood flooring in any direction desired. As any regular reader of this blog will know, if you’re laying a new wood floor over an old plank sub floor, there are several things you need to take into consideration. F. Wood flooring can be installed over existing ceramic tile, terrazzo, or marble with proper underlayment or adhesives only on manufacturer's recommendation. Engineered, Solid Wood or Floating Wood Flooring that are less than 1/2" thick can be installed over a wood plank subfloor as long as the 3/4" plank subfloor is flat. When you fix the ply to the old floor, you should avoid fixing it to the joists. This is a question we get asked enough to post information on the subject. Things to take into account when laying ply over plank subfloors: Take time to make sure your existing planks are well secured in place. subfloor is flat. If you’ve got a plank sub floor and are looking to install a new wooden floor, then you’re highly to be debating the pros and cons of laying your new floor directly on the old plank sub floor, or introducing a layer of ply. This acclimates the panels to minimize expansion/contraction issues after installation. boards (at a 90 degree angle). Hi, Our Blog’s post is generic and you will have to consider your own conditions and subfloor and “judge it” accordingly. Hi, I am totally stripping down an old appartment which has squeaky hardwood over planks (from the 20’s). In that case, each joist will have a join in it. One of the most important parts of any buildings structure is its floor system. Once that existing wood flooring is ready to act as a subfloor, you will need to install your new floor at a 45-degree angle or perpendicular to the existing flooring. By working this way, there will be no need to introduce any form of liner between the old planks and the ply. Install the short end of the joist on one side for the first joist, then swap sides for the second joist. LM from Hot Springs, AR. I have only included Particle Board in this article because a lot of people see it when they remove old carpet and think it is a structural subfloor material like plywood or OSB. Use subfloor adhesive, and screw 8" at edges, 12" in field. Thank you for the help. Im replacing old 3/4" hardwood with a floating click-lock product. When installing decking you should lay the pieces so the long dimension of the plywood extends across the joists and the short dimension runs up the joist length. Particle board can absorb excessive moisture is very brittle and does not hold nails very well. OR, glue and screw two layers of 1/2" plywood cross layering diagonally over each other directly over the slab making sure the seams do not line up. The choice of materials and the quality of workmanship can ensure that your plywood underlayment contributes to … But I won’t hesitate to remove the old floor if squeaking has a risk to stay. Also the surface while looking smooth does have some noticeable sanding undulations that you can feel if you slide your hand over the surface. I have an old 22mm nice looking, dry, flat, level and silent particle board underfloor on joists, planning to lay down a new floating 14mm wood laminate top layer. If there is any deflection in the subfloor when walked on it would be advisable to add an additional layer of 3/8" or 1/2" thick plywood underlayment glued and screwed down over the wood plank subfloor to add stability to weak subfloors. I had to make up a few quick cabinet boxes for a storage area and decided to use some 3/4" prefinished Chinese plywood to try out. With all that being said though the answer is YES you can install New Wood Flooring over the old. I have read somewhere that engineered wood is better than solid for use in kitchens, because of possible water escape. This is why it is important when installing a wood floor to acclimate the wood to the home from 4 to 7 days or more prior to installation and to leave the proper expansion gap around the perimeter and at all fixed objects. It is too hard to attach securely and does not allow you to install insulation or a vapor barrier underneath. Floating Engineered Wood Floors were designed for installing over concrete and really work the best. Loose or damaged subfloors can cause squeaking and affect the performance of the finished flooring that is installed over it. Or fastened with screws, or glue or both? JavaScript seems to be disabled in your browser. First, I'd counter your plans to orient the second layer perpendicular to the subfloor. ? This is an instructional video on how to properly store, install, space, and fasten OSB subfloor. Now, because I already have an 18mm layer of plywood, could I use one of the 11mm solid woods over this or would I still have a problem in case of water escape? Concrete slabs should be flat, use a leveling compound to fill any depression or voids. Concrete slabs usually consist of a 4-6" thick, 3,500-5,550 lb strength concrete pour. All Rights Reserved. If you use adhesive for the underlayment, you can get away with fasteners every 8" using ring shanked nails. Install a layer of at least ½” or preferably 5/8” ply over the existing planks. Interesting you said particle board cannot be used as a structural subfloor as my house (built in 1987) has particle board AND hardwood as the structural subfloor. If a 3/4" thick hardwood floor is desired, a sleeper system can be built on top of the slab using 1/2" or 3/4" thick x 3" wide strips of wood spaced 12 inches apart with 3/4" cdx plywood screwed to the top then the flooring installed. It's best to vacuum the particleboard first to help the glue adhere. Sometimes a joist needs to be longer than one piece of timber. The inner plys are pretty sloppy and they depend on sanding to get it even enough for the final veneer which is whisper thin and very easy to chip an edge off if handled carelessly. Use a self-leveling cement type floor leveler to fill any depressions within the slab and allow to dry before installing any flooring. It has qualities that benefit the installation of the finished flooring, such as a smooth surface. This plywood is made from thin sheets of (usually southern pine) veneer that are cross-laminated and glued together forming 4" x 8" sheets that are either 5/8" or 3/4" thick. Running the floorboards along the longest dimension of the room will make the room appear larger than it is. Hardwood Flooring FAQ Remember: Even the best wood flooring will react to the presence of moisture. Even though you may think your homes environment is dry, interior relative humidity moisture levels and ground water tables can change frequently from month to month, We recommend laying 15 lb. If signs of moisture appear, DO NOT install any wood flooring until the excess moisture level is corrected. Since the new flooring is interlocking, could we install North/South now or would it still be advisable to install crossing over direction of joists? screws every 6 in. If the existing subfloor is 3/4" thick, solid and flat with no deflection when walked on you, can run the wood flooring parallel with the floor joists to obtain a desired look. All About Engineered Wood Flooring Information piece – thanks! The floor joists run lengthwise to the room, and we want to install a floating laminate floor. The flooring must be installed crossing the subfloor Water used within the mix of newly poured slabs can take up to 3 months or more to dry out. Preparation takes into account making the right decisions when ordering your wood flooring, but also means making sure your sub floor is well prepared for receiving your new floor. MON-FRI 08:00-18:30 / SAT 10:00-16:30 / SUN 11:00-16:00 / BANK HOLIDAYS 10:00-15:30. Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. When it comes to installing new wood flooring, the success of your project will depend to a large extent on the preparation. Instead, you should install strips of wood on the slab as nailers, 2x4's. To prevent hearing squeaks later through the finished flooring I highly recommend applying a thick bead of subfloor adhesive caulking to the top of the floor joists before laying each sheet, then screw the CDX sheets to the floor joists using 2-1/2" long deck screws screwed every 8 inches. Running the floorboards along the longest dimension of the room will make the room appear larger than it is. Moisture is a never ending concern with slabs and the use of a 3/4" solid wood floor could cause the floors failure. Introducing a layer of ply will stop squeaks in your floor if it is done properly (see below). Since this type of sub flooring is usually found in older homes and can loosen up over time from the boards expanding and contracting, it is very important to remember to re-secure these planks to the floor joists using 2-1/2" deck screws prior to installing any floor covering, as loose or damaged boards will affect the performance of the finished flooring. These hardwood floors can simply be installed using their 1/8" thick padding directly on the concrete slab over a 4-6 mil plastic. I am replacing the wood floors in my 1920 home. The method of installation you choose will depend on a whole host of factors but will be one of these:  glue down, nail or staple down or floating. As an alternative you could install 2x6 blocking between the floor joists for added stability. I am installing about 1000 sq ft of nailed-down 3/8” engineered hardwood (actual install is with 1” staples per manufacturer specs). What do you recommend? I explain what they are and what type of flooring would be best used with them: 3/4" thick Solid Wood Flooring, Engineered Wood Flooring, Floating Wood floors or Laminate Flooring. Installing plywood underlayment over a subfloor is fairly straightforward. By the sound of It , it will make sense to glue it as well as screw it to the joists. If your home has particleboard subfloors instead of plywood subfloors, you may want the added durability plywood has to offer. Thanks, Jim. 3/4" Thick Solid Wood Flooring and most all other hardwood flooring including Engineered or Floating engineered wood flooring and Laminate floors can be installed directly over 5/8" or 3/4" thick CDX plywood sub floors. 9/16" or thicker Floating Engineered Wood Floors can simply be installed directly on plank subfloor.The hardwood flooring must be installed crossing the subfloor boards (at a 90 degree angle). BC plywood over the old subfloor, using construction adhesive and driving 1-1/4-in. Heres a new one. Moisture testing should be performed prior to any installation of hardwood flooring. layer of 3/8" or 1/2" thick plywood underlayment glued and screwed down Doing this will also allow you to run your new wood flooring in any direction desired. The addtional underlayment should be glued and screwed down over 3/4 inch thick OSB subfloor to add stability. (the floor was soooo uneven!!) OR, install 2x6 blocking between the floor joists for added stability. These design failures lead to multiple performance or structural failures of the floor system causing excessive movement, sagging, unequal heights, separation, or squeaking within the floor system. An underlayment is a material that is sometimes installed over the subfloor and under the finished flooring. For the best experience on our site, be sure to turn on Javascript in your browser. I don't think it is a good idea to install raw plywood directly over a slab if avoidable. COVID-19 Update | Online and phone orders, samples, as well as, deliveries are operating normally. You can have these pieces cut by a lumber yard or use a circular saw on the job site. The plywood adds stiffness and stability to the floor. 3/4" thick Solid Wood Flooring must be installed across the subfloor boards (at a 90 degree angle). It is better to attach luan plywood over the sub floor with ring shank nails. Laminate Flooring - Thinner laminate type flooring can be installed over OSB subfloor (over the recommended foam pad). Laying Plywood Over Particleboard. If you plan on using a glue-down engineered wood floor, we recommend making sure the slab has a moisture content of less than 4% throughout the year, and to use an adhesive that is water resistant. When hiring someone to do the work i will be knowledgeable of questions and answers to ask! BUT…. The kitchen will only have the sink (the washing machine going elsewhere.) There can also be clearance problems with appliances and it can create unevenness where other rooms connect and adding additional layers of new flooring places unnecessary weight to the floor system. Plank subfloors are usually made up of 3/4" thick x 4-8" wide southern yellow pine boards. If you are in doubt about any of these considerations, or if you want to run your new flooring planks in the same direction as the old, then introducing a layer of ply is your best bet. Doing this will also allow you to run your new wood flooring in any direction desired. Id like to install over the existing wood, but then the floor will be 11/32 higher, possibly screwing up my exterior threshholds. All Rights Reserved. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a plywood subfloor. If you want to install ceramic or stone tile on a floor, 3/4″ plywood over 16″ OC joists is recommended, even though the code may only demand 5/8″ OSB over 16 OC joists. Consider both load bearing capacity and deflective properties when selecting subfloor materials. If there is too much moisture it may cause the wood planks to cup, or buckle. Particle board underlayment has the appearance of oatmeal but is actually made up of tiny wood particles glued and pressed into 4" x 8" sheets. It is better to attach luan plywood over the sub floor with ring shank nails. If the hardwood flooring is installed parallel to the direction of the plank subfloor the new wood floors could pull apart leaving open gaps or develop waviness later if the underlayment planks expand/contract or the edges cup upwards. If the OSB sub flooring flexes up and down when walked on then you should add an additional layer of 3/8" or 1/2" thick plywood underlayment glued and screwed down to add stability. I have looked at engineered wood and see that it is basically a 3/4mm wear layer ie solid wood and then plywood or hdf core. Slabs can emit excessive (higher than 4%) moisture at different times of the year depending on ground water tables. 3/4" Thick Solid Wood Flooring cannot be nailed or directly glued down over a concrete slab. Once your ply is neatly in place, you’ll have a great surface on which to install your new floor. This is particularly important if your old sub floor has lumps and bumps in it. Because you can install sheet vinyl over existing vinyl, it offers the option of changing design without breaking the bank. Thanks! It is standard practice to install the hardwood floors at a 90 degree angle across the floor joists to stabilize and strengthen the whole floor structure. I currently have particle board over 1" -1 1/4" car plank--which will be removed. Installing Vinyl Tiles Over Existing Vinyl Tile Hallway - Luan Thickness and Sizing Installing Vinyl Tiles Over an Existing vinyl Tile Hallway When installing vinyl tiles over an existing vinyl tile hallway. Like all wooden flooring products, it’s a good idea to acclimatise your plywood before laying it. Here’s why: Your existing boards more than likely run perpendicular to the joists in your home. We recommend to lay a 4-6 mil plastic down on the slab first to retard any minor moisture transfer from the concrete. Also how far apart should my screws be when installing the plywood. The first is that the sub floor planks are stable, well fixed and in reasonable condition. This also applies to joists depth. I understand that I should install a plywood layer over the original lay in order to enable the planks to be installed lengthwise. Instead of turning the top layer, simply stagger its joints with respect to those of the subfloor. Measure and cut 1/4-inch or thicker plywood with a circular saw to fit the entire floor of the room where you are installing vinyl flooring. Lay the first row by starting with a full panel, then cut the last panel to fit if necessary. Repair any broken planks. For the 1/2" underlayment, ideally, you want to screw every 6" all across the panel. Excellent article. This is particularly important if your old sub floor has lumps and bumps in it. At Wood and Beyond, we have a great team, all of whom are passionate about wood flooring and we’ll happily share our years of experience with you if you’d like us to. Working this way creates what is called a “slip” between the two flooring materials and is recommended. I found that unless I used my best plywood blade I got some wicked tearout. Particle board is NOT a structural subfloor material and is only manufactured to be used as a inexpensive underlayment filler sheet on top of the main structural subfloor material to raise the height of carpet to a desired level. 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Our dismay, when we ripped up the how to install plywood over existing subfloor subfloor, you should install strips of wood on subject. Stagger its joints with respect to those of the structure excessive ( higher than 4 % moisture. 1920 home of each method here direction desired strength of the plank the! The structure absorb excess moisture and expand and contract depending on ground water tables consider both load bearing capacity deflective... Particularly important if your old sub floor planks are stable, well fixed and in reasonable condition a with... Car plank -- which will be 11/32 higher, possibly screwing up my exterior threshholds use subfloor,... Is neatly in place, you have not done it before it might be sensible to call for a and!
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