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. Information piece – thanks! • 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. Here are nine common subfloor installation mistakes and how to prevent them: 1. Not sure what I can do at this point... actually very helpful. Please do the addition below. Cut the plywood to size, running the circular saw across the width of the board. Of the two most common subfloor materials, builders often debate which is best: plywood or OSB. Building paper is a catchall term for single-ply sheathing paper manufactured in various thicknesses. This type of plywood, therefore, should ideally be used as subfloor rather than the top layer of a floor. recommend laying 15 lb. 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. 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. I-joists are 16" oc. Step 5 My research is telling me to use two layers of plywood. Joined: May 2005 Posts: 583 CT: We have squeaky floors all throughout our house. Cushioning shall be supplied and installed per manufacturer’s instructions. Attach second layer of subfloor material with nails or staples 12" O.C. 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. None. If you have a concrete slab floor, the slab may be considered the subfloor. Or fastened with screws, or glue or both? button button The ... make sure that you are screwing no farther than the bottom layer of plywood. 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. For instance, should the second layer be glued to the first? Install maple flooring parallel with main playing court by nailing or stapling approximately 12" O.C. Step 4 lay plywood in place on floor. I'm building a subfloor to support a natural slate floor in the kitchen and living room area. Remove sanding dust from entire surface by tack or vacuum. 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. The flooring must be installed crossing the subfloor Lay the Plywood. OSB Subflooring looks like, and is, a bunch of wood chips glued together. a. This is a question we get asked enough to post information on the subject. (on center) joist spacing with single-layer OSB or plywood subfloor for ceramic and porcelain tile installation; 24” O.C. The reason for this thick plywood subfloor is to prevent the 2″ angled flooring nails from penetrating all the way through the subfloor. Slab floors that have a 4-6 mil plastic installed prior to the pour will better retard moisture transfer later. The wood flooring shall be MFMA-RL, MFMA-FJ or MFMA-PQ maple. Also, it seems the joints between the two layers could be staggered to give more rigidity to the floor, too. When hiring someone to do the work i will be knowledgeable of questions and answers to ask! 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. double layer wood floor consisting of: • minimum subfloor thickness – 23/32", 3/4" nom. 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. 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. One of the most important parts of any buildings structure is its floor system. The floor system shall not be delivered or installed until all masonry, plastering/dry walling, tile and overhead mechanical trades are complete. The concrete slab shall be cleaned of all debris by general contractor so the accredited installation company will have adequate access to work surface. Total construction height is 73mm. All About Installing Hardwood Flooring Over Radiant Heat The standard dimensions are 1220mm x 2440mm or 4 ft by 8 ft. BUT the additional height of both the particle board and the new flooring may pose a problem with doors and appliances. 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. 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. These subfloors must meet structural requirements. OR, install 2x6 blocking between the floor joists for added stability. You will need to make sure it is sturdy, level and within the requirements of the manufacturer. 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. What people seemed to be describing in this thread is the subfloor requirements for tiling a floor. should be completed and dry prior to delivery to insure proper acclimation of the maple 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. 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. 24 oc. If required by the flooring system manufacturer, install recommended blocking below bleachers in the extended position. I have read somewhere that engineered wood is better than solid for use in kitchens, because of possible water escape. Insert the Deck Screws. Glued cork underlayment is also used when the subfloor needs to be raised before installing the laminate. A double layer may be required where the existing/base layer and structure do not meet NWFA minimum guidelines. All finish and/or wet trades, such as concrete, painting, etc. 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 kitchen will only have the sink (the washing machine going elsewhere.) 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. Hardwood Flooring FAQ Machine sand with coarse, medium and fine paper to a smooth, even and uniform surface. If tile is put down, additional underlayment will be added on top of the subfloor. Miter inside corners, and use pre molded outside corners. Doing this will also allow you to run your new wood flooring in any direction desired. Sand-Poly-Sand slab construction is not acceptable. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) 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. 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 The pros would be Less work, more overall floor strength, more soundproofing to the neighbors under. 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. OSB provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation best practices are followed. Any advice on the "cover vs remove" decision tree? I was originally planning to just brace the subfloor from underneath. 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. 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. 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. Provide 2" expansion voids at the perimeter and at all vertical obstructions. 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. Laminate Flooring - Thinner laminate type flooring can be installed over OSB subfloor (over the recommended foam pad). layer of plywood starting with a full strip 2 ft. off center from the first layer. (Option: Install both layers of plywood at 45 degree angles to finished flooring.) (the floor was soooo uneven!!) joists are currently covered with a 5/8" plywood subfloor. joist spacing with double-layer OSB or plywood subfloor for ceramic and porcelain tile installation The 16" o.c. The panels may also be laid on a diagonal or perpendicular, with 1/8” spacing between sheets. Remember: Even the best wood flooring will react to the presence of moisture. According to Setting Tile (Page 81), I should provide blocking between the joists for plywood sheet ends. 12-15-2005, 02:32 PM. black felt Hardwood flooring underlayment paper over the subfloor overlapping the seams 4-6 inches to help retard moisture transfer. 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. 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. 3/4" Thick Solid Wood Flooring cannot be nailed or directly glued down over a concrete slab. Apply seal and finish per finish manufacturer's instructions. Aside from the price, my main concern with the double 3/4" subfloor was causing any additional issues. 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. Veneer Grade. ie. CDX plywood is created using C- and D-grade laminates on the outside of the plywood. There are two methods for dealing with these issues. Most engineered wood floors can also be installed using the floating method. Installation usually consists of nailing these boards to the floor joists. Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. 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? What do you recommend? • Wood floors should be double layer construction with a minimum total thickness of 1”. Understanding the Upgrades: Enhanced Plywood and Subfloor Products. 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. Flooring fasteners shall be barbed cleats or coated staples, unless otherwise specified by MFMA flooring manufacturer. 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. It is NOT suitable to use as a structural subfloor material. Sonya Cooper. 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. 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. DITRA can be installed over these wood subfloor systems: 16” or 19.2” O.C. For instance, should the second layer be glued to the first? 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. 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. Some high-end houses even have a triple layer of subfloor. Consult your local MFMA Sport Floor contractor for specific information. Install vented cove base by anchoring to walls with base cement, screws or anchors. The second layer should consist of nominal ½” (15/ 32”, 11.9mm) CD EXPOSURE 1 plywood Doing this will also allow you to run your new wood flooring in any direction desired. All Rights Reserved. © 2004-2012, Copyright protected. 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. This question is regarding the base subfloor, and not any underlayments. 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. It comes in various thickness but for our comparison we will consider 18mm thick plywood. CDX plywood is traditional wood plywood made from thin layers of lumber, known as veneers. In the summer months when the humidity is higher the wood will absorb excess moisture and expand and the gaps will disappear. The flooring must be installed crossing the floor joists (at a 90 degree angle). 24" (610 mm) o.c. The double layer of plywood is glued and screwed together, but not attached to the existing subfloor. 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. 32/16. I would use pl premium and screws for compression between the layers. 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. Learn if you can lay tile on plywood or on subfloor and tips for how to make this a success. All About Engineered Wood Flooring I will install a mix of ceramic tiles and new hardwood. However my current plan is to glue and screw 1 1/8" sturdifloor plywood to the joists. 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. 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. Dancy House. 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'. Floating Engineered Wood Floors were designed for installing over concrete and really work the best. 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. Some flaking. over plank subfloor to add stability prior to installing any flooring. 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 existing sub floor is one layer of 1/2" (15/16") plywood over 2x8s 16" on center. Tongue and Groove. Lay the Plywood. Concrete slabs need to be flat. 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. For the last 40 years CDX tongue and grooved plywood has been the most commonly used exterior structural subfloor material used in homes. Provide 2" expansion voids at the perimeter and at all vertical obstructions. (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.). Laminate Flooring, which can only be installed using the floating method, can be installed over a 3/4" thick or thicker layer of APA plywood underlayment. Refer to individual flooring manufacturer's warranty for specific provisions and exclusions. Step 5 drive deck screws every 8 inches along chalk line. A beautiful floor starts with a stable subfloor. How well the floor structure is designed and built will determine how much weight the floor can carry. my question now is, the flat is open plan, that is, the kitchen/dining/living is all open and at the same level. 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. This is new construction. Concrete slabs usually consist of a 4-6" thick, 3,500-5,550 lb strength concrete pour. Cover entire concrete slab with surface vapor retarder, lapping joints a minimum of 6" or as specified by the vapor retarder manufacturer. Doing this will also allow you to run your new wood flooring in any direction desired. The floor system carries the weight of interior walls, roof, furniture, appliances, finished flooring, people, etc. Learn All About Subfloor Systems. 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. With a top coat of 6.5mm sports vinyl, glued with welded joints the system is featuring high performance combi-elastic characteristics acc. Is this normal in older houses? If you desire to run the wood flooring parallel with the subfloor boards you must install an additional layer of 3/8" or 1/2" thick plywood underlayment glued and screwed down over the plank subfloor. OSB provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation best practices are followed. Improper spacing. Concrete subfloors shall have an adequate moisture barrier beneath and at the perimeter of the slab. My plan is to remove the old hardwood, but am wondering if it may not be better to keep it, screw it down, and glue and screw a 3/4 plywood over it. Heres a new one. 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). Running the floorboards along the longest dimension of the room will make the room appear larger than it is. 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. The subfloor must be rigid, free from movement, and have at least 18” of well-ventilated air space below. 12-15-2005, 02:32 PM. View Full Version : 1 1/8 plywood subfloor vs. double layer. 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. Need a level surface to lay another 1/2" plywood subfloor layer. 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 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. 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. Building Paper Between Layers of 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. 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. Moisture is a never ending concern with slabs and the use of a 3/4" solid wood floor could cause the floors failure. 3/4" thick Solid Wood Flooring must be installed across the subfloor boards (at a 90 degree angle). OR, install 2x6 blocking between the floor joists for added stability. 12 years ago. 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*. Oriented Strand Board (378) Model# FG10006 $ 5 08. • Wood subfloors must not exceed 8% moisture content when measured with a Delmhorst Wood Moisture Tester. This question is regarding the base subfloor, and not any underlayments. 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. 01-08-2009, 05:26 AM dansdrive : Location: Wake Forest. parallel to the direction of the plank subfloor the laminate flooring But I must level up 9-10 mm first and found some simple 9mm MDF boards that would fit. This is new construction. 888-480-9138 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. on center should penetrate 11⁄ 2 in. Copyright � 1998-2020, Hosking Hardwood Flooring. This is used to make sure a real human is filling in the review. 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. 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. Hi, I am totally stripping down an old appartment which has squeaky hardwood over planks (from the 20’s). If the laminate flooring is installed parallel to the direction of the floor joists the Laminate flooring could develop distortion later. 3/4" Thick Solid Wood Flooring can be installed directly over 3/4" thick OSB subfloor. Need a level surface to lay another 1/2" plywood subfloor layer. 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. 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? If so, what do you recommend to fill the joint between the 2 types of 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'. Each layer is oriented with its grain running perpendicular to the adjacent layer. subfloor requirements; substrate preparation; movement joints; thin-set, grout, and more. When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. No, it is not recommended to install a thick or double layer of underlayment with laminate flooring. The MFMA Mill Accredited Installation Company* shall warrant the floor installation, and shall furnish a flooring materials warranty from the flooring manufacturer. The subfloor is the bottom-most layer and it rests on the joists. With all that being said though the answer is YES you can install New Wood Flooring over the old. Using the original sub-floor nails as a guide, mark the floor joist locations on the wall to know where to insert the screws. BUT…. into the existing joists. mfma@maplefloor.org But I won’t hesitate to remove the old floor if squeaking has a risk to stay. Building paper is a catchall term for single-ply sheathing paper manufactured in various thicknesses. 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? Aside from the price, my main concern with the double 3/4" subfloor was causing any additional issues. Here are nine common subfloor installation mistakes and how to prevent them: 1. All About Floating Engineered Wood Floors I will say the house has no floor squeeks!!! Running the floorboards along the longest dimension of the room will make the room appear larger than it is. 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 second layer should consist or nominal ½” (15/32”, 11.9mm) CD EXPOSURE 1 plywood subfloor panels, (Exposure 1) 4' x 8' sheets. 3/4" T&G is glued and nailed. View Full Version : 1 1/8 plywood subfloor vs. double layer. Loose or damaged subfloors can cause squeaking and affect the performance of the finished flooring that is installed over it. 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. Re: double layer plywood subfloor [ Re: bristolbaby ] #704961 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. 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. Flooring shall be delivered to the premises and acclimated, if necessary. 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. Underlayment is manufactured and meant to be used as only a single layer to allow your floor to be balanced and float properly. Provide 2" expansion voids at the perimeter and at all vertical obstructions. subfloor when walked on it would be advisable to add an additional 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. DH-W24-T-20 24" (610 mm) o.c. and 6" from edges of subfloor material on all sides. We A similar system utilizes a foam or cork pad, which is loose-laid over the subfloor. 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. 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. Replacing damaged parts of a plank floor that is 7/8" thick. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a plywood subfloor. 3/4" T&G was rained on several times. The addtional underlayment should be glued and screwed down over 3/4 inch thick OSB subfloor to add stability. This provides dimensional stability and improves the strength of the board. 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. By Jeff Hosking – Hosking Hardwood Flooring Inc. 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. Use a self-leveling cement type floor leveler to fill any depressions within the slab and allow to dry before installing any flooring. 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 hardwood flooring must be installed crossing the subfloor boards (90 degree angle). Using the original sub-floor nails as a guide, mark the floor joist locations on the wall to know where to insert the screws. 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. (When using parquet, construction adhesive should also be used between the layers of plywood as recommended by the flooring system manufacturer.) It is also important to keep the home's relative humidity level at between 30 - 50% or what the manufacturer recommends. 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. ... you could add a plywood subfloor overtop of the tile. Laminate Flooring FAQ, All About Solid Wood Flooring The subfloor is always a structural layer of sheet good material—usually plywood or OSB, or occasionally particleboard. I'm building a subfloor to support a natural slate floor in the kitchen and living room area. Can 3/4 inch hardwood be installed over subfloor AND then continue over concrete slab? I-joists are 16" oc. plank subfloor (over the recommended foam pad) as long as the plank We also go over questions regarding Particle Board and Installing New Hardwood Flooring over Old Wood Flooring. I would use pl premium and screws for compression between the layers. 16mm load distributing sheet in chipboard or birch ply, fixed to a double layer batten system of pine boards, laid over elastic shock pads. Slabs can emit excessive (higher than 4%) moisture at different times of the year depending on ground water tables. As an alternative you could install 2x6 blocking between the floor joists for added stability. I plan to adhere, with thinset, another 5/8" or 3/4" layer of plywood along with a waterproofing membrane. Wall base shall be 4" x 3" x 4' heavy duty molded, vented, rubber or vinyl cove base with pre molded outside corners as supplied by flooring manufacturer. The floorcoverings can then be loose-laid if required on a domestic project or bonded, more usually, if it’s a commercial project. 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.
2020 double layer plywood subfloor