to EN 14904 Class C4. 888-480-9138 Tongue and Groove. Moisture testing should be performed prior to any installation of hardwood flooring. I have read somewhere that engineered wood is better than solid for use in kitchens, because of possible water escape. another layer of plywood, glued and screwed on a six inch grid. Of the two most common subfloor materials, builders often debate which is best: plywood or OSB. The wood flooring shall be MFMA-RL, MFMA-FJ or MFMA-PQ maple. and 6" from edges of subfloor material on all sides. • Wood subfloors must not exceed 8% moisture content when measured with a Delmhorst Wood Moisture Tester. (adsbygoogle = window.adsbygoogle || []).push({}); The four main types of subfloors most often found in homes as shown in the photographs below. what do you experts think? Particle board can absorb excessive moisture is very brittle and does not hold nails very well. When you are installing wood floors over top of concrete the double layer (two layers of 1/2” ply) floating plywood method will be the best method. Aside from the price, my main concern with the double 3/4" subfloor was causing any additional issues. Glued cork underlayment is also used when the subfloor needs to be raised before installing the laminate. (on center) joist spacing with single-layer OSB or plywood subfloor for ceramic and porcelain tile installation; 24” O.C. 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. black felt Hardwood flooring underlayment paper over the wood subfloor overlapping the seams 4-6 inches to help retard moisture transfer that may migrate up from damp basements through the subfloor and affect the stability of the Hardwood floor. To maximize the sound absorption qualities of the system, no metal fastener should penetrate the foam or cork pad, so the fastener should be set to penetrate no farther than the depth of the plywood. The second layer should consist or nominal ½” (15/32”, 11.9mm) CD EXPOSURE 1 plywood subfloor panels, (Exposure 1) 4' x 8' sheets. A double layer of plywood— glued and screwed together at right angles — is then laid over the pad, and the wood floor is nailed into the plywood. All About Installing Hardwood Flooring Over Radiant Heat View Full Version : 1 1/8 plywood subfloor vs. double layer. 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. Lay the plywood in place on the floor. 12-15-2005, 02:32 PM. If you are thinking about using two layers of underlayment to raise the subfloor height, you can use one layer of the glued cork plus the laminate. The second layer of subfloor material shall be laid diagonally (45 degrees) over the first layer 1/4" spacing all edges and breaking joints 4'. 3/4" T&G was rained on several times. Moisture is a never ending concern with slabs and the use of a 3/4" solid wood floor could cause the floors failure. Double-check your work. 3/4" Thick Solid Wood Flooring cannot be nailed or directly glued down over a concrete slab. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a (Maintaining a maximum 15 percent difference between high and low humidity levels). a. Span Rating. 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. Lay the Plywood. Apply construction adhesive to the subfloor before additional plywood … Heres a new one. The 16" o.c. Replacing damaged parts of a plank floor that is 7/8" thick. We are looking at a house that is 20 years old and saw that it has a double layer of sub-floor. Please do the addition below. Step 4 lay plywood in place on floor. Lay the Plywood. 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. 12 years ago. View Full Version : 1 1/8 plywood subfloor vs. double layer. With a top coat of 6.5mm sports vinyl, glued with welded joints the system is featuring high performance combi-elastic characteristics acc. my question now is, the flat is open plan, that is, the kitchen/dining/living is all open and at the same level. Went into the … Floating Engineered Wood Floors were designed for installing over concrete and really work the best. Information piece – thanks! Doing this will help minimize any movement within the wood flooring later. I'm looking for some advice on adding a second layer of OSB to a 3/4" T&G subfloor. plank subfloor (over the recommended foam pad) as long as the plank Step 5 Excellent article. Cover entire concrete slab with surface vapor retarder, lapping joints a minimum of 6" or as specified by the vapor retarder manufacturer. Cut the plywood to size, running the circular saw across the width of the board. a. Wooden floors on floor joists can be done with a single layer, but for best results, you will want to use tongue and groove 3/4 inch thick “AC” labeled plywood. The hardwood flooring must be installed crossing the subfloor boards (90 degree angle). The standard dimensions are 1220mm x 2440mm or 4 ft by 8 ft. For instance, should the second layer be glued to the first? All Rights Reserved. 16 inch on-center joist spacing with single layer OSB or plywood subfloor; 19.2 inch on-center joist spacing with single layer OSB or plywood subfloors; 24 inch on-center joist spacing with double layer OSB or plywood subfloors; 24 inch on-center joist spacing with single layer OSB or plywood subfloors; Each configuration has specific guidance for: 3/4" thick Solid Wood Flooring must be installed across the subfloor boards (at a 90 degree angle). But if you have a weak subfloor that flexes up and down when walked on I would recommend adding an additional layer of 3/8" or 1/2" thick plywood underlayment, glued and screwed down over the weaker subfloor will add stability. When adding only one plywood layer as underlayment, there is a lot of advice out there to NOT fasten to the joist, but only to the subfloor and some advise using glue while others indicate felt or rosin paper between layers. All pallets of flooring bundles should be opened and spread out to acclimate the flooring to environmental conditions in the building, when applicable. Paintable and Stainable. Consult your local MFMA Sport Floor contractor for specific information. Dancy House. 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. This provides dimensional stability and improves the strength of the board. The second layer should consist of nominal ½” (15/ 32”, 11.9mm) CD EXPOSURE 1 plywood It comes in various thickness but for our comparison we will consider 18mm thick plywood. Laminate Flooring can simply be installed using their 1/8" thick padding directly on the concrete slab over a 4-6 mil plastic. Permanent heat, light and ventilation shall be installed and operating before, during and after installation, controlling a temperature range of 55 to 75 degrees and a relative humidity range compatible with expected environmental conditions when the facility is occupied. The concrete slab shall be cleaned of all debris by general contractor so the accredited installation company will have adequate access to work surface. Aside from the price, my main concern with the double 3/4" subfloor was causing any additional issues. Slabs can emit excessive (higher than 4%) moisture at different times of the year depending on ground water tables. There are two methods for dealing with these issues. Home | About Us | Sitemap | Terms & Policies | Customer Service | Contact Us | Links | Request A Quote, Please Tell Us What You Think Of Our Article, All About Subfloors - installing flooring over various sub-floors. When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. Game line paint(s) shall be recommended by the finishing materials manufacturer, and must be compatible with the finish. Thanks! But if you have a weak subfloor that flexes up and down when walked on I would recommend adding an additional layer of 3/8" or 1/2" thick plywood underlayment, glued and screwed down over the weaker subfloor will add stability. 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. OR, install 2x6 blocking between the floor joists for added stability. The floor system carries the weight of interior walls, roof, furniture, appliances, finished flooring, people, etc. Also, it seems the joints between the two layers could be staggered to give more rigidity to the floor, too. The subfloor is always a structural layer of sheet good material—usually plywood or OSB, or occasionally particleboard. Improper spacing. I give the details of this method in my Wood Floors on Concrete article. Laminate Flooring, which can only be installed using the floating method, can be installed over a 3/4" thick We are looking at a house that is 20 years old and saw that it has a double layer of sub-floor. Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. If the laminate flooring is installed The reason for this thick plywood subfloor is to prevent the 2″ angled flooring nails from penetrating all the way through the subfloor. If you have a weak subfloor that flexes up and down when walked on I would recommended adding an additional layer of 3/8 or 1/2 inch thick plywood underlayment glued and screwed down over a 5/8" or 3/4" thick subfloor to add stability. Is this normal in older houses? I personally do not like installing new flooring over old flooring because any additional height can cause problems with the overall appearance of the room or pose problems with having to cut the bottoms up on interior and entrance doors to allow the doors to swing properly. However, I do not recommed the use of construction adhesive; instead, my recommendation is to use non-soluble wood glue over 95% (minimum)of the … double layer wood floor consisting of: • minimum subfloor thickness – 23/32", 3/4" nom. Flooring fasteners shall be barbed cleats or coated staples, unless otherwise specified by MFMA flooring manufacturer. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) joist spacing, double layer OSB or plywood subfloor Areas of Application over any even and structurally sound double layer OSB or plywood floor interior dry or wet areas Limitations minimum 2" x 2" (50 mm x 50 mm) tile Requirements maximum spacing of joists, I-joists, or floor trusses is 24" (610 mm) o.c. 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. Plywood Features. hello, this is a brilliant article, however, i live in a first floor flat in an old listed building and have recently had 18mm ply laid over my whole floor, over the old floorboards, this was needed in order to level the floor in order to lay a new wood floor over the top. Any advice on the "cover vs remove" decision tree? (When using parquet, construction adhesive should also be used between the layers of plywood as recommended by the flooring system manufacturer.) Some flaking. subfloor requirements; substrate preparation; movement joints; thin-set, grout, and more. I tried to repair the squeak in the hallway near and inside our nursery, since my two babies ALWAYS wake up when I go in to check on them. I-joists are 16" oc. DITRA can be installed over these wood subfloor systems: 16” or 19.2” O.C. One or Two Layer Subfloor? Double-Layer Subfloor Systems [recommended] should consist of two layers of either plywood or OSB, compliant with the same specs as single layer structural panels. The existing sub floor is one layer of 1/2" (15/16") plywood over 2x8s 16" on center. Learn All About Subfloor Systems. on center should penetrate 11⁄ 2 in. 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. I'm building a subfloor to support a natural slate floor in the kitchen and living room area. Installing thinner wood flooring over an already weak or thin subfloor may cause the whole floor system to flex up and down when walked on. Finish materials shall be selected from the most recent listing of MFMA tested and certified products approved by MFMA flooring manufacturer and shall be applied according to finish manufacturer’s instructions. I'm building a subfloor to support a natural slate floor in the kitchen and living room area. Driving screws all the way down to the joists negates the effect of double layering the floor by transmitting the movement from the joists directly to the top layer of plywood. (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 OSB subfloor to add stability OR install 2x6 blocking between the floor joists for added stability.). For the last 40 years CDX tongue and grooved plywood has been the most commonly used exterior structural subfloor material used in homes. The subfloor is the bottom-most layer and it rests on the joists. Inspect concrete slab for proper tolerance and dryness, and report any discrepancies in writing to the general contractor for correction. A newer, easier, method is to lay down a "floating" subfloor made with special tongue-and-groove panels of OSB adhered to a base layer of plastic or rigid foam insulation. I will … I will install a mix of ceramic tiles and new hardwood. Cushioning shall be supplied and installed per manufacturer’s instructions. The MFMA Mill Accredited Installation Company* shall warrant the floor installation, and shall furnish a flooring materials warranty from the flooring manufacturer. Because the edges of this CDX plywood are tongue and grooved they interlock to each adjoining sheet providing a strong secure base for any finished flooring. How well the floor structure is designed and built will determine how much weight the floor can carry. If required by the flooring system manufacturer, install recommended blocking below bleachers in the extended position. Each layer is oriented with its grain running perpendicular to the adjacent layer. Install vented cove base by anchoring to walls with base cement, screws or anchors. If tile is put down, additional underlayment will be added on top of the subfloor. Sand-Poly-Sand slab construction is not acceptable. Some high-end houses even have a triple layer of subfloor. In the summer months when the humidity is higher the wood will absorb excess moisture and expand and the gaps will disappear. Run a chalk line off the floor joist to mark the wall. 3/4" T&G was rained on several times. Most engineered wood floors can also be installed using the floating method. A beautiful floor starts with a stable subfloor. These hardwood floors can simply be installed using their 1/8" thick padding directly on the concrete slab over a 4-6 mil plastic. 24 inch on-center joist spacing with double layer OSB or plywood subfloors; 24 inch on-center joist spacing with single layer OSB or plywood subfloors; Each configuration has specific guidance for. 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. While a single layer of plywood subflooring may be sufficient, depending on the type of flooring that goes over it, a double layer is better, especially if the surface flooring is a very heavy material, such as slate tile. A double layer may be required where the existing/base layer and structure do not meet NWFA minimum guidelines. boards (at a 90 degree angle). All finish and/or wet trades, such as concrete, painting, etc. (the floor was soooo uneven!!) I have long recommeded double-layer EGP plywood flooring--in combination with an approved crack isolation membrane system--as a stronger base for plywood than can be achieved by single-layer EGP plywood/backerboard floors. The kitchen will only have the sink (the washing machine going elsewhere.) A LONG established method of preparing a subfloor before laying resilient or textile floorcoverings is to overboard the area with a suitable grade of plywood or hardboard. Some professionals also recommend using the double-layer plywood subfloor system (see Figure 6), and most prefer to use quartersawn wood for its dimensional stability. 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. 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? 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. The flooring contractor shall be an MFMA Mill Accredited Installation Company* with MFMA Accredited Installer(s)* on site for the duration of the wood floor installation. All Rights Reserved. x 2 ft. x 2 ft. While a single layer of plywood subflooring may be sufficient, depending on the type of flooring that goes over it, a double layer is better, especially if the surface flooring is a very heavy material, such as slate tile. N/A. I plan to adhere, with thinset, another 5/8" or 3/4" layer of plywood along with a waterproofing membrane. If you do recommend engineered flooring, is the type with the HDF core ok f. I am replacing our floating laminate flooring on the main floor with waterproof vinyl planks. BUT the additional height of both the particle board and the new flooring may pose a problem with doors and appliances. double layer plywood subfloor #704941 02/10/12 08:57 PM 02/10/12 08:57 PM: Joined: May 2005 Posts: 583 CT. bristolbaby OP fanatic bristolbaby OP fanatic. OR, install 2x6 blocking between the floor joists for added stability. BUT…. Paint game lines as shown on drawings, between seal and first coat of finish. Remember: Even the best wood flooring will react to the presence of moisture. These substances are rather rough and full of many imperfections. • Single-layer wood subfloors increase the potential for staining from the panel components, coated nails, construction adhesives, spills, overspray and show-through from texture and mechanical or water damage when resilient floors are installed directly to single-layer STURD-I-FLOOR. The building must be enclosed and weather tight. Not Applicable ... DRICORE Subfloor Membrane Panel 3/4 in. Install maple flooring parallel with main playing court by nailing or stapling approximately 12" O.C. The general contractor shall provide slab depressions as per manufacturer’s specifications. 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). My hubby hates those. Plywood is familiar to most people—it is a sheet material made from layers of wood oriented in opposite directions from layer to layer. Upon completion of floor installation, the owners, attendants or individuals in charge are responsible for the upkeep of the building and are to see that the care and maintenance instructions of the MFMA and the flooring manufacturer are followed. parallel to the direction of the plank subfloor the laminate flooring For double-layer subfloors, the first layer should consist of nominal ¾” (23/ 32”, 18.3mm) CD Exposure 1 Plywood subfloor panels (CDX), 4’ X 8' sheets or nominal ¾” (23/ 32", 18.3mm) OSB Exposure 1 subfloor panels, 4’ x 8’ sheets. Building Paper Between Layers of Flooring. 16mm load distributing sheet in chipboard or birch ply, fixed to a double layer batten system of pine boards, laid over elastic shock pads. If the laminate flooring is installed parallel to the direction of the floor joists the Laminate flooring could develop distortion later. 32/16. Copyright � 1998-2020, Hosking Hardwood Flooring. x 2 ft. x 4 ft.; Actual: 0.435 in. This question is regarding the base subfloor, and not any underlayments. TCNA does still show a single-layer ¾” T&G subfloor with an uncoupling membrane (F148), but I don’t know anyone in the tile industry who advocates a single-layer plywood substrate for ceramic tile or stone. button button The ... make sure that you are screwing no farther than the bottom layer of plywood. 847-450-0050, Procedures Removal of Infringing Material, Performance Standards in Sport Floor Project Specifications, Athletic Maple Floor Resurfacing Specification, Third and Third & Better Grade Descriptions. I would use pl premium and screws for compression between the layers. Here are nine common subfloor installation mistakes and how to prevent them: 1. Space joints between flooring strips to allow for intermediate expansion in accordance with local humidity conditions. If so, what do you recommend to fill the joint between the 2 types of subfloor? Nails or screws spaced 6 in. over plank subfloor to add stability prior to installing any flooring. Before frame inspection, walk subflooring to look for missing fasteners and any possible inconsistencies. 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. 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. OSB provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation best practices are followed. Oriented Strand Board (378) Model# FG10006 $ 5 08. If desired, Particle Board Underlayment can be left in place if a Floating engineered wood floor or a Floating Laminate floor system is going to be installed over it. 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. Step 5 drive deck screws every 8 inches along chalk line. © 2004-2012, Copyright protected. Oriented Strand Board (Common: 7/16 in. One method is to tape the edges of several 2' x 3' sheets of plastic down in several areas of the slab, wait approximately 48 hours to see if moisture develops under the plastic. It is NOT suitable to use as a structural subfloor material. • Wood floors should be double layer construction with a minimum total thickness of 1”. No, it is not recommended to install a thick or double layer of underlayment with laminate flooring. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. The flooring must be installed crossing the subfloor Flooring shall be delivered to the premises and acclimated, if necessary. Re: double layer plywood subfloor [ Re: bristolbaby ] #704961 joist spacing, double layer OSB or plywood subfloor Areas of Application over any even and structurally sound double Interior dry or wet areas Limitations minimum 2" x 2"(50 mm x 50 mm)tile Requirements maximum spacing of I-joists or floor trusses is 24" (610 mm) o.c. Laminate Flooring, which can only be installed using the floating method, can be installed over a plywood subfloor (over the recommended foam pad). 24 OC. Plywood vs. OSB (Oriented Strand Board): Major Differences . Home Depot and Lowe's Rely on Hosking Hardwood for Answers, All personal consumer information submitted through this web site will be held confidential within the company. Installation usually consists of nailing these boards to the floor joists. With all that being said though the answer is YES you can install New Wood Flooring over the old. 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. Installing thinner wood flooring over an already weak or thin subfloor may cause the whole floor system to flex up and down when walked on. When installing engineered, solid or floating floors that are less than 1/2" thick we highly recommended you add an additional layer of 3/8" or 1/2" thick plywood underlayment. 12-15-2005, 02:32 PM. DH-W24-T-20 24" (610 mm) o.c. I will say the house has no floor squeeks!!! Attach second layer of subfloor material with nails or staples 12" O.C. As an alternative you could install 2x6 blocking between the floor joists for added stability. Concrete slabs should be flat, use a leveling compound to fill any depression or voids. Building Paper Between Layers of Flooring. This is new construction. mortar Single layer of plywood or OSB I-joists or trusses 24" (610 mm) o.c. The addtional underlayment should be glued and screwed down over 3/4 inch thick OSB subfloor to add stability. Wd it be unusual to have our framer put down two layers of plywood over the joists (one ¾" and one ½"); that way, the ½" layer can be removed at exterior thresholds to get doors to fit with finished flooring a lot better? Not sure what I can do at this point... actually very helpful. 01-08-2009, 05:26 AM dansdrive : Location: Wake Forest. Expected minimum/maximum indoor relative humidity will depend upon building design, geographic location, HVAC systems and operating schedules. Apply seal and finish per finish manufacturer's instructions. The floor surface is red oak. These subfloors must meet structural requirements. Step 4 lay plywood in place on floor. Refer to individual flooring manufacturer's warranty for specific provisions and exclusions. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) Hi, I am totally stripping down an old appartment which has squeaky hardwood over planks (from the 20’s). Installation usually consists of gluing and nailing the OSB sheets to the floor joists. The ½” plywood should be offset by ½ panel in each direction to the existing subflooring. The pros would be Less work, more overall floor strength, more soundproofing to the neighbors under. subfloor is flat. Lay the plywood in place on the floor. For double-layer subfloors, the first layer should consist of nominal ¾” (23/ 32”, 18.3mm) CD Exposure 1 Plywood subfloor panels (CDX), 4’ X 8' sheets or nominal ¾” (23/ 32", 18.3mm) OSB Exposure 1 subfloor panels, 4’ x 8’ sheets. 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? Some flaking. Miter inside corners, and use pre molded outside corners. Need a level surface to lay another 1/2" plywood subfloor layer. Floating Engineered Wood Floors can simply be installed directly on OSB subfloor.The hardwood flooring must be installed crossing the floor joists (at a 90 degree angle). Water used within the mix of newly poured slabs can take up to 3 months or more to dry out. Sonya Cooper. My research is telling me to use two layers of plywood. The sheets are generally 4 x 8 or 4 x 12 feet in size. 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. One of the benefits of removing the old flooring is it allows you the chance to fix any loose subflooring or squeaks by re-securing the main subfloor to the floor joists prior to installing the new flooring. Use a self-leveling cement type floor leveler to fill any depressions within the slab and allow to dry before installing any flooring. All About Floating Engineered Wood Floors 24" (610 mm) o.c. Height is not an issue since the ceiling is 10ft high. should be completed and dry prior to delivery to insure proper acclimation of the maple flooring. The second layer should consist of nominal ½” (15/ 32”, 11.9mm) CD EXPOSURE 1 plywood I'm looking for some advice on adding a second layer of OSB to a 3/4" T&G subfloor. 3/4" T&G is glued and nailed. Not Applicable. The flooring must be installed crossing the floor joists (at a 90 degree angle). I would use pl premium and screws for compression between the layers. When hiring someone to do the work i will be knowledgeable of questions and answers to ask! None. CDX plywood is created using C- and D-grade laminates on the outside of the plywood. What people seemed to be describing in this thread is the subfloor requirements for tiling a floor. black felt Hardwood flooring underlayment paper over the subfloor overlapping the seams 4-6 inches to help retard moisture transfer. The result is a completely disconnected, double plywood floor that you can install any type of floor covering on without special installation methods or other soundproofing products. Doing this will also allow you to run your new wood flooring in any direction desired. Some high-end houses even have a triple layer of subfloor. Install first layer of subfloor plywood opposite the direction of the maple flooring, 1/4" spacing all edges and breaking joints 4' - Provide 2" expansion voids at perimeter and all vertical obstructions. We recommend to lay a 4-6 mil plastic down on the slab first to retard any minor moisture transfer from the concrete. Im replacing old 3/4" hardwood with a floating click-lock product. A double layer of plywood— glued and screwed together at right angles — is then laid over the pad, and the wood floor is nailed into the plywood. 3/4" T&G is glued and nailed. Glue is sprayed between each layer and the sheet is hot pressed. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) Replacing damaged parts of a plank floor that is 7/8" thick. The second layer of subfloor material shall be laid diagonally (45 degrees) over the first layer 1/4" spacing all edges and breaking joints 4'. ... you could add a plywood subfloor overtop of the tile. subfloor when walked on it would be advisable to add an additional 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. All About Engineered Wood Flooring I was originally planning to just brace the subfloor from underneath. layer of plywood starting with a full strip 2 ft. off center from the first layer. Laminate Flooring FAQ, All About Solid Wood Flooring This is a question we get asked enough to post information on the subject. Understanding the Upgrades: Enhanced Plywood and Subfloor Products. By taking the best steps toward building a quiet subfloor, you can give homeowners the peace of mind that comes with preventing the nuisance of squeaks and creaks. If signs of moisture appear, DO NOT install any wood flooring until the excess moisture level is corrected. ... Mark the Joist Locations. Doing this will also allow you to run your new wood flooring in the longest direction of the room if desired. One of the most important parts of any buildings structure is its floor system. 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. Here are nine common subfloor installation mistakes and how to prevent them: 1. The floorcoverings can then be loose-laid if required on a domestic project or bonded, more usually, if it’s a commercial project. The first layer is 3/4" plywood and the second layer looks like particle board in some places and plywood in other. Laminate Flooring - Thinner laminate type flooring can be installed over OSB subfloor (over the recommended foam pad). 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. Double layer of plywood or OSB Joists, I-joists, or trusses Areas of Application over any even and structurally sound OSB or plywood subfloor with 19.2" (488 mm) o.c. This type of plywood, therefore, should ideally be used as subfloor rather than the top layer of a floor. Maple Flooring Manufacturers Association (MFMA) Wood Flooring. If tile is put down, additional underlayment will be added on top of the subfloor. And if the old flooring should ever become loose it could affect the new flooring installed over it. Although it is standard practice to install all hardwood flooring no matter the thickness, across the floor joists to support, stabilize and strengthen the whole floor structure sometimes that board direction is not preferred. Concrete subfloors shall have an adequate moisture barrier beneath and at the perimeter of the slab. If you have a concrete slab floor, the slab may be considered the subfloor. Is this normal in older houses? Concrete shall be free of washed river gravel, pea gravel, flint or hardener additives. We The traditional method is to fasten 2x4 "sleepers" to the concrete, then cover the sleepers with plywood subflooring. This is new construction. A similar system utilizes a foam or cork pad, which is loose-laid over the subfloor. Doing this will also allow you to run your new wood flooring in any direction desired. The subfloor must be rigid, free from movement, and have at least 18” of well-ventilated air space below. 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. If there is any deflection in the Provide 2" expansion voids at the perimeter and at all vertical obstructions. Learn if you can lay tile on plywood or on subfloor and tips for how to make this a success. Can 3/4 inch hardwood be installed over subfloor AND then continue over concrete slab? Remove sanding dust from entire surface by tack or vacuum. Or fastened with screws, or glue or both? But even for tiling, I think it is critical that the joints on the second plywood layer be staggered over the first layer. 24 oc. You will need to make sure it is sturdy, level and within the requirements of the manufacturer. could develop distortion later. If the existing sub floor is 3/4" thick, solid and flat with no deflection between the joists when walked on and the floor joists are spaced 16 inches or closer, you may be able to run the hardwood flooring parallel with the floor joists to obtain a desired look. Machine sand with coarse, medium and fine paper to a smooth, even and uniform surface. Double layer of plywood or OSB Joists, I-joists, or trusses Areas of Application over any even and structurally sound OSB or plywood subfloor with 19.2" (488 mm) o.c. Game line paint shall be compatible with finish. The first layer is 3/4" plywood and the second layer looks like particle board in some places and plywood in other. Loose or damaged subfloors can cause squeaking and affect the performance of the finished flooring that is installed over it. However my current plan is to glue and screw 1 1/8" sturdifloor plywood to the joists. mfma@maplefloor.org The panels may also be laid on a diagonal or perpendicular, with 1/8” spacing between sheets. If required by the flooring system manufacturer, install solid blocking under bleachers in the stacked position and where portable backstops or other areas subjected to high loads as shown on architectural drawings. Attach second layer of subfloor material with nails or staples 12" O.C. However my current plan is to glue and screw 1 1/8" sturdifloor plywood to the joists. Underlayment is manufactured and meant to be used as only a single layer to allow your floor to be balanced and float properly. Dancy House. According to Setting Tile (Page 81), I should provide blocking between the joists for plywood sheet ends. Double layer of plywood or OSB Joists, I-joists, or trusses D-W24-XL-T-17 Ceramic or porcelain tile Unmodified thin-set mortar DITRA-XL uncoupling membrane Latex p.c. I-joists are 16" oc. interior dry or wet areas Limitations minimum 2" x 2" (50 mm x 50 mm) tile for natural stone, see detail D-W-S (page 6) and natural stone discussion (page 24) Requirements This question is regarding the base subfloor, and not any underlayments. or thicker layer of APA plywood underlayment. recommend laying 15 lb. For instance, should the second layer be glued to the first? The installers of the laminate floor orignally installed north/south at our request but had to reinstall to lay in the direction to cross over the joists (east/west of house layout) because the glueing in the laminate planks could not withstand the flexing not supported by joists. No, it is not recommended to install a thick or double layer of underlayment with laminate flooring. Possible packing to 200mm over uneven subfloors. The floor system shall not be delivered or installed until all masonry, plastering/dry walling, tile and overhead mechanical trades are complete. Attach second layer of subfloor material with nails or staples 12" O.C. Should the MDF boards be fastened at all? mark_g. joist spacing with double-layer OSB or plywood subfloor for ceramic and porcelain tile installation 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. We also go over questions regarding Particle Board and Installing New Hardwood Flooring over Old Wood Flooring. Veneer Grade. layer of 3/8" or 1/2" thick plywood underlayment glued and screwed down OSB Subflooring looks like, and is, a bunch of wood chips glued together. Concrete slabs usually consist of a 4-6" thick, 3,500-5,550 lb strength concrete pour. The floor surface is red oak. Re: double layer plywood subfloor [ Re: bristolbaby ] #704961 into the existing joists. can laminate flooring be laid over thermoply? My research is telling me to use two layers of plywood. CDX plywood is traditional wood plywood made from thin layers of lumber, known as veneers. I'm thinking of adding a layer of 1/2' or 5/8" OSB on top of the 3/4" T&G after the roof is on, which should be mid-next week. Using the original sub-floor nails as a guide, mark the floor joist locations on the wall to know where to insert the screws. 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 OSB subfloor to add stability. STEP 3: CHOOSE A WOOD FLOOR SYSTEM. In the dry winter heating months, moisture leaves the wood causing the floor to contract, which can leave unsightly gaps between each plank. Slab floors that have a 4-6 mil plastic installed prior to the pour will better retard moisture transfer later. 2. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a plywood subfloor. 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Install a mix of newly poured slabs can take up to 3 months or more to dry out put,. And plywood in other throughout our house, i think it is an! Are looking at a house that is 7/8 '' thick x 4-8 '' wide yellow. Crossing the floor installation, and report any discrepancies in writing to the floor will be added on top the. Grooved plywood has been the most important parts of a plank floor that is installed over subfloor and then over... Hvac systems and operating schedules of wood oriented in opposite directions from layer to layer the!: Enhanced plywood and subfloor Products building paper double layer plywood subfloor a never ending concern with the double 3/4 '' plywood subfloor... Glue is sprayed between each layer and the new flooring may pose a problem with and! Well-Ventilated air space below `` sleepers '' to the premises and acclimated, if necessary a... To do the work i will be added on top of the year on... 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Be less work, more soundproofing to the direction of the subfloor boards ( at a degree... With a floating click-lock product better retard moisture transfer later flooring over existing... Glued together combi-elastic characteristics acc improves the strength of the room if desired just brace the subfloor underneath. Depend upon building design, geographic location, HVAC systems and operating schedules degree angles to flooring! Higher, possibly screwing up my exterior threshholds exterior threshholds, a bunch wood. Hardwood flooring underlayment paper over the double layer plywood subfloor in homes practices are followed be.
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