and 6" from edges of subfloor material on all sides. Running the floorboards along the longest dimension of the room will make the room appear larger than it is. mark_g. The general contractor shall provide a concrete slab, troweled smooth and level to a tolerance of +/- 1/8" in a 10' radius, subject to the approval of the MFMA Mill Accredited Installation Company*. Lay the Plywood. Building Paper Between Layers of Flooring. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a plywood subfloor. Sonya Cooper. Using the original sub-floor nails as a guide, mark the floor joist locations on the wall to know where to insert the screws. 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. ... you could add a plywood subfloor overtop of the tile. The floor system shall not be delivered or installed until all masonry, plastering/dry walling, tile and overhead mechanical trades are complete. Sand-Poly-Sand slab construction is not acceptable. I'm looking for some advice on adding a second layer of OSB to a 3/4" T&G subfloor. Remember: Even the best wood flooring will react to the presence of moisture. 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. 3/4" Thick Solid Wood Flooring cannot be nailed or directly glued down over a concrete slab. Attach second layer of subfloor material with nails or staples 12" O.C. If so, what do you recommend to fill the joint between the 2 types of subfloor? • Wood floors should be double layer construction with a minimum total thickness of 1”. on center should penetrate 11⁄ 2 in. The double layer of plywood is glued and screwed together, but not attached to the existing subfloor. 24 OC. The floor surface is red oak. If the laminate flooring is installed 32/16. No, it is not recommended to install a thick or double layer of underlayment with laminate flooring. 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. Particle board can absorb excessive moisture is very brittle and does not hold nails very well. 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. 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. The MFMA Mill Accredited Installation Company* shall provide all tools and services to install a complete wood floor system from the concrete’s surface vapor polyethylene retarder, when required, upward through the sanding and finishing, plus the installation of perimeter moldings. Please do the addition below. 3/4" T&G was rained on several times. button button The ... make sure that you are screwing no farther than the bottom layer of plywood. 3/4" Thick Solid Wood Flooring can be installed directly over 3/4" thick OSB subfloor. Here are nine common subfloor installation mistakes and how to prevent them: 1. Span Rating. 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. A similar system utilizes a foam or cork pad, which is loose-laid over the subfloor. plank subfloor (over the recommended foam pad) as long as the plank If signs of moisture appear, DO NOT install any wood flooring until the excess moisture level is corrected. The floor surface is red oak. another layer of plywood, glued and screwed on a six inch grid. 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). 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. Subject to local conditions. STEP 3: CHOOSE A WOOD FLOOR SYSTEM. BUT the additional height of both the particle board and the new flooring may pose a problem with doors and appliances. 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. Flooring shall be MFMA-RL Northern Hard Maple, MFMA-FJ Northern Hard Maple; 25/32" or 1/2" thick x 3-1/4", 2-1/2", 2-1/4" or 1-1/2" wide; First, Second and Better, Third and Better, Third or Utility Grade; T & G and EM; grade marked and stamped as produced by an MFMA member manufacturer or MFMA-PQ Northern Hard Maple; 5/16" to 7/16" thick panels; Second and Better or Third Grade; grade marked and stamped as produced by an MFMA member manufacturer. Veneer Grade. This is new construction. 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. Oriented Strand Board (Common: 7/16 in. Cut the plywood to size, running the circular saw across the width of the board. Hi, I am totally stripping down an old appartment which has squeaky hardwood over planks (from the 20’s). © 2004-2012, Copyright protected. The sheets are generally 4 x 8 or 4 x 12 feet in size. Floating Engineered Wood Floors were designed for installing over concrete and really work the best. What do you recommend? This question is regarding the base subfloor, and not any underlayments. Re: double layer plywood subfloor [ Re: bristolbaby ] #704961 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. All About Floating Engineered Wood Floors One of the most important parts of any buildings structure is its floor system. We are looking at a house that is 20 years old and saw that it has a double layer of sub-floor. Use a self-leveling cement type floor leveler to fill any depressions within the slab and allow to dry before installing any flooring. Moisture testing should be performed prior to any installation of hardwood flooring. BUT…. The ½” plywood should be offset by ½ panel in each direction to the existing subflooring. Concrete slabs usually consist of a 4-6" thick, 3,500-5,550 lb strength concrete pour. Any advice on the "cover vs remove" decision tree? All pallets of flooring bundles should be opened and spread out to acclimate the flooring to environmental conditions in the building, when applicable. I plan to adhere, with thinset, another 5/8" or 3/4" layer of plywood along with a waterproofing membrane. Remove sanding dust from entire surface by tack or vacuum. 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. A beautiful floor starts with a stable subfloor. Re: double layer plywood subfloor [ Re: bristolbaby ] #704961 The general contractor shall provide slab depressions as per manufacturer’s specifications. Building Paper Between Layers of Flooring. 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. 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. 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 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. 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'. Slabs can emit excessive (higher than 4%) moisture at different times of the year depending on ground water tables. 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. Lay the plywood in place on the floor. 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. 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. Here are nine common subfloor installation mistakes and how to prevent them: 1. Paint game lines as shown on drawings, between seal and first coat of finish. 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. If tile is put down, additional underlayment will be added on top of the subfloor. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) Laminate Flooring FAQ, All About Solid Wood Flooring Building paper is a catchall term for single-ply sheathing paper manufactured in various thicknesses. Regardless of whether the subfloor is single- or double-layer, Armstrong Flooring recommends the following: • If the top layer is tongue-and-groove and the strip wood is 3" or less in face width, cover with 1/4" or thicker underlayment panels. 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. Step 4 lay plywood in place on floor. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) 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. All About Installing Hardwood Flooring Over Radiant Heat layer of 3/8" or 1/2" thick plywood underlayment glued and screwed down Provide 2" expansion voids at the perimeter and at all vertical obstructions. I would use pl premium and screws for compression between the layers. These substances are rather rough and full of many imperfections. my question now is, the flat is open plan, that is, the kitchen/dining/living is all open and at the same level. Is this normal in older houses? I'm building a subfloor to support a natural slate floor in the kitchen and living room area. 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. 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 ... Mark the Joist Locations. Concrete slabs should be flat, use a leveling compound to fill any depression or voids. 24 oc. Doing this will also allow you to run your new wood flooring in any direction desired. The panels may also be laid on a diagonal or perpendicular, with 1/8” spacing between sheets. 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. (Maintaining a maximum 15 percent difference between high and low humidity levels). 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. Joined: May 2005 Posts: 583 CT: We have squeaky floors all throughout our house. The subfloor must be rigid, free from movement, and have at least 18” of well-ventilated air space below. Doing this will also allow you to run your new wood flooring in the longest direction of the room if desired. The first layer is 3/4" plywood and the second layer looks like particle board in some places and plywood in other. (adsbygoogle = window.adsbygoogle || []).push({}); The four main types of subfloors most often found in homes as shown in the photographs below. I'm looking for some advice on adding a second layer of OSB to a 3/4" T&G subfloor. Expected minimum/maximum indoor relative humidity will depend upon building design, geographic location, HVAC systems and operating schedules. If you install any additional underlayment, the base for your flooring will end up being too soft and could jeopardize the integrity of the locking system. Inspect entire area of floor to ensure that surface is acceptable for finishing, completely free from sanding dust. Improper spacing. Glue is sprayed between each layer and the sheet is hot pressed. Dancy House. 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. 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. The second layer should consist of nominal ½” (15/ 32”, 11.9mm) CD EXPOSURE 1 plywood Install maple flooring parallel with main playing court by nailing or stapling approximately 12" O.C. APA Rated Sturd-I-Floor (also known as "Single Floor") is a combined subfloor-underlayment product designed specifically for single-layer floor construction beneath carpet and pad. Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. 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. Too many times over the years I have seen homes that were built that have had weak foundation footings, Improper spaced support columns, undersized and/or improperly spaced floor joists or weak improperly nailed sub flooring. could develop distortion later. Paintable and Stainable. Some flaking. Some flaking. The flooring must be installed crossing the subfloor If you have a concrete slab floor, the slab may be considered the subfloor. Step 4 lay plywood in place on floor. 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. If there is any deflection in the 2. Concrete subfloors shall have an adequate moisture barrier beneath and at the perimeter of the slab. parallel to the direction of the plank subfloor the laminate flooring 12 years ago. 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. 3/4" T&G was rained on several times. 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. Game line paint(s) shall be recommended by the finishing materials manufacturer, and must be compatible with the finish. If the laminate flooring is installed parallel to the direction of the floor joists the Laminate flooring could develop distortion later. But even for tiling, I think it is critical that the joints on the second plywood layer be staggered over the first layer. View Full Version : 1 1/8 plywood subfloor vs. double layer. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) mfma@maplefloor.org 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'. Plywood Features. 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. The second layer should consist or nominal ½” (15/32”, 11.9mm) CD EXPOSURE 1 plywood subfloor panels, (Exposure 1) 4' x 8' sheets. Plank subfloors are usually made up of 3/4" thick x 4-8" wide southern yellow pine boards. 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. This document specifies a wood strip or parquet gymnasium floor system consisting, in general, of maple flooring, wood subflooring, vapor retarder, sanding, sealers, finishes, game lines and wall base. If there is too much moisture it may cause the wood planks to cup, or buckle. All Rights Reserved. With a top coat of 6.5mm sports vinyl, glued with welded joints the system is featuring high performance combi-elastic characteristics acc. You will need to make sure it is sturdy, level and within the requirements of the manufacturer. N/A. double layer wood floor consisting of: • minimum subfloor thickness – 23/32", 3/4" nom. Provide 2" expansion voids at the perimeter and at all vertical obstructions. 16 inch on-center joist spacing with single layer OSB or plywood subfloors; 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. 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. Doing this will also allow you to run your new wood flooring in any direction desired. Can I 'glue and screw' a two thinner pieces of plywood (1/2" and 3/8"), or do I need to source 7/8" plywood? 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. Concrete slabs need to be flat. I-joists are 16" oc. 12-15-2005, 02:32 PM. Im replacing old 3/4" hardwood with a floating click-lock product. The pros would be Less work, more overall floor strength, more soundproofing to the neighbors under. If this type of underlayment is present, it will have to be removed when planning to install a nail or glue down hardwood floor. a. OSB provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation best practices are followed. Run a chalk line off the floor joist to mark the wall. The floor system carries the weight of interior walls, roof, furniture, appliances, finished flooring, people, etc. Customer Expectations When Buying Hardwood Flooring, Our Installation and Refinishing Services, How to measure a room for installing a hardwood floor, What Size Flooring Staples / Nails to Use, Choosing a Hardwood Flooring Wood Species, Prefinished or Unfinished Hardwood Flooring, All About Wear Layers - Engineered Flooring, Hardwood Installation Tips What you need to know, minimize any movement within the wood flooring, All About Floating Engineered Wood Floors, All About Installing Hardwood Flooring Over Radiant Heat, Home Depot and Lowe's Rely on Hosking Hardwood for Answers. However my current plan is to glue and screw 1 1/8" sturdifloor plywood to the joists. boards (at a 90 degree angle). Lay the plywood in place on the floor. 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. Not Applicable ... DRICORE Subfloor Membrane Panel 3/4 in. We Possible packing to 200mm over uneven subfloors. 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. 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: For the last 40 years CDX tongue and grooved plywood has been the most commonly used exterior structural subfloor material used in homes. It comes in various thickness but for our comparison we will consider 18mm thick plywood. x 2 ft. x 2 ft. 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. (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.). can laminate flooring be laid over thermoply? Not sure what I can do at this point... actually very helpful. 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. (the floor was soooo uneven!!) This type of plywood, therefore, should ideally be used as subfloor rather than the top layer of a floor. This is a question we get asked enough to post information on the subject. Also, it seems the joints between the two layers could be staggered to give more rigidity to the floor, too. My hubby hates those. 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? Installation usually consists of nailing these boards to the floor joists. 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. Insert the Deck Screws. Apply construction adhesive to the subfloor before additional plywood … 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. or as specified by the flooring manufacturer. In the dry winter heating months, moisture leaves the wood causing the floor to contract, which can leave unsightly gaps between each plank. Inspect concrete slab for proper tolerance and dryness, and report any discrepancies in writing to the general contractor for correction. If there is any deflection in the wood plank 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 plank subfloor to add stability to weak subfloors. The subfloor is always a structural layer of sheet good material—usually plywood or OSB, or occasionally particleboard. These hardwood floors can simply be installed using their 1/8" thick padding directly on the concrete slab over a 4-6 mil plastic. joist spacing with double-layer OSB or plywood subfloor for ceramic and porcelain tile installation subfloor is flat. The traditional method is to fasten 2x4 "sleepers" to the concrete, then cover the sleepers with plywood subflooring. 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 … I will … There are two methods for dealing with these issues. Install vented cove base by anchoring to walls with base cement, screws or anchors. Tongue and Groove. CDX plywood is traditional wood plywood made from thin layers of lumber, known as veneers. Can 3/4 inch hardwood be installed over subfloor AND then continue over concrete slab? When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. View Full Version : 1 1/8 plywood subfloor vs. double layer. 888-480-9138 The addtional underlayment should be glued and screwed down over 3/4 inch thick OSB subfloor to add stability. Laminate Flooring - Thinner laminate type flooring can be installed over OSB subfloor (over the recommended foam pad). Can I 'glue and screw' a two thinner pieces of plywood (1/2" and 3/8"), or do I need to source 7/8" 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 the OSB subfloor to add stability. Information piece – thanks! This is new construction. This is used to make sure a real human is filling in the review. (When using parquet, construction adhesive should also be used between the layers of plywood as recommended by the flooring system manufacturer.) 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. Flooring shall be delivered to the premises and acclimated, if necessary. Apply seal and finish per finish manufacturer's instructions. • 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. A double layer may be required where the existing/base layer and structure do not meet NWFA minimum guidelines. 16mm load distributing sheet in chipboard or birch ply, fixed to a double layer batten system of pine boards, laid over elastic shock pads. 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. Laminate Flooring, which can only be installed using the floating method, can be installed over a 3/4" thick It is NOT suitable to use as a structural subfloor material. mortar Single layer of plywood or OSB I-joists or trusses 24" (610 mm) o.c. We are looking at a house that is 20 years old and saw that it has a double layer of sub-floor. 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. The subfloor is the bottom-most layer and it rests on the joists. into the existing joists. Using the original sub-floor nails as a guide, mark the floor joist locations on the wall to know where to insert the screws. 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. Thanks! 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. Understanding the Upgrades: Enhanced Plywood and Subfloor Products. Oriented Strand Board (378) Model# FG10006 $ 5 08. what do you experts think? And if the old flooring should ever become loose it could affect the new flooring installed over it. 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. 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. black felt Hardwood flooring underlayment paper over the subfloor overlapping the seams 4-6 inches to help retard moisture transfer. The floorcoverings can then be loose-laid if required on a domestic project or bonded, more usually, if it’s a commercial project. 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. I-joists are 16" oc. The 16" o.c. 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 … to EN 14904 Class C4. Plywood vs. OSB (Oriented Strand Board): Major Differences . subfloor when walked on it would be advisable to add an additional Moisture is a never ending concern with slabs and the use of a 3/4" solid wood floor could cause the floors failure. layer of plywood starting with a full strip 2 ft. off center from the first layer. None. 3/4" T&G is glued and nailed. 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. Excellent article. Refer to individual flooring manufacturer's warranty for specific provisions and exclusions. Replacing damaged parts of a plank floor that is 7/8" thick. Id like to install over the existing wood, but then the floor will be 11/32 higher, possibly screwing up my exterior threshholds. For instance, should the second layer be glued to the first? CDX plywood is created using C- and D-grade laminates on the outside of the plywood. Each layer is oriented with its grain running perpendicular to the adjacent layer. DH-W24-T-20 24" (610 mm) o.c. How well the floor structure is designed and built will determine how much weight the floor can carry. Should the MDF boards be fastened at all? Learn All About Subfloor Systems. DITRA can be installed over these wood subfloor systems: 16” or 19.2” O.C. As an alternative you could install 2x6 blocking between the floor joists for added stability. 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. What people seemed to be describing in this thread is the subfloor requirements for tiling a floor. 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. This question is regarding the base subfloor, and not any underlayments. Dancy House. a. Heres a new one. Aside from the price, my main concern with the double 3/4" subfloor was causing any additional issues. Is this normal in older houses? ie. should be completed and dry prior to delivery to insure proper acclimation of the maple flooring. 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. The flooring must be installed crossing the floor joists (at a 90 degree angle). Went into the … Consult your local MFMA Sport Floor contractor for specific information. 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. Game line paint shall be compatible with finish. OSB Subflooring looks like, and is, a bunch of wood chips glued together. Water used within the mix of newly poured slabs can take up to 3 months or more to dry out. subfloor requirements; substrate preparation; movement joints; thin-set, grout, and more. Step 5 x 2 ft. x 4 ft.; Actual: 0.435 in. The first layer is 3/4" plywood and the second layer looks like particle board in some places and plywood in other. All Rights Reserved. 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. 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. One or Two Layer Subfloor? I have read somewhere that engineered wood is better than solid for use in kitchens, because of possible water escape. 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. 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'. I give the details of this method in my Wood Floors on Concrete article. 01-08-2009, 05:26 AM dansdrive : Location: Wake Forest. I was originally planning to just brace the subfloor from underneath. 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. Attach second layer of subfloor material with nails or staples 12" O.C. 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. (on center) joist spacing with single-layer OSB or plywood subfloor for ceramic and porcelain tile installation; 24” O.C. The wood flooring shall be MFMA-RL, MFMA-FJ or MFMA-PQ maple. Aside from the price, my main concern with the double 3/4" subfloor was causing any additional issues. I will install a mix of ceramic tiles and new hardwood. All About Engineered Wood Flooring Not Applicable. Improper spacing. 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). Attach second layer of subfloor material with nails or staples 12" O.C. Slab floors that have a 4-6 mil plastic installed prior to the pour will better retard moisture transfer later. Step 5 drive deck screws every 8 inches along chalk line. But I must level up 9-10 mm first and found some simple 9mm MDF boards that would fit. But I won’t hesitate to remove the old floor if squeaking has a risk to stay. 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. The hardwood flooring must be installed crossing the subfloor boards (90 degree angle). 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. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a Subfloor shall be 15/32" x 4' x 8', minimum 4 ply, APA (or flooring manufacturers approved rated equivalent) Rated Sheathing, Exposure 1, or per MFMA flooring manufacturer design. 3/4" thick Solid Wood Flooring must be installed across the subfloor boards (at a 90 degree angle). Before frame inspection, walk subflooring to look for missing fasteners and any possible inconsistencies. With all that being said though the answer is YES you can install New Wood Flooring over the old. In the summer months when the humidity is higher the wood will absorb excess moisture and expand and the gaps will disappear. Height is not an issue since the ceiling is 10ft high. The reason for this thick plywood subfloor is to prevent the 2″ angled flooring nails from penetrating all the way through the subfloor. Plywood is familiar to most people—it is a sheet material made from layers of wood oriented in opposite directions from layer to layer. The second layer should consist of nominal ½” (15/ 32”, 11.9mm) CD EXPOSURE 1 plywood Need a level surface to lay another 1/2" plywood subfloor layer. Cover entire concrete slab with surface vapor retarder, lapping joints a minimum of 6" or as specified by the vapor retarder manufacturer. joists are currently covered with a 5/8" plywood subfloor. The kitchen will only have the sink (the washing machine going elsewhere.) 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. Space joints between flooring strips to allow for intermediate expansion in accordance with local humidity conditions. The underside of the first layer shall have 32 cushion pads per sheet attached 12" 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). The building must be enclosed and weather tight. 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. If tile is put down, additional underlayment will be added on top of the subfloor. Installation usually consists of gluing and nailing the OSB sheets to the floor joists. Of the two most common subfloor materials, builders often debate which is best: plywood or OSB. • Wood subfloors must not exceed 8% moisture content when measured with a Delmhorst Wood Moisture Tester. or thicker layer of APA plywood underlayment. Maple Flooring Manufacturers Association (MFMA) Wood Flooring. For instance, should the second layer be glued to the first? Running the floorboards along the longest dimension of the room will make the room appear larger than it is.

double layer plywood subfloor

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