between the vapor barrier and the concrete, it will absorb moisture and a. Plywood must be minimum 3/4" thick, untreated, APA rated, Type-1, exterior grade plywood, OSB or equal. minimize warping and shrinkage. Cut … These 11 years ago. this, or instead go with carpet placed directly on the slab (or with padding). not loosen later. Then he poured our Param 5500 self leveling concrete about 1/4 inch thick with a smooth finish. You can install a foam board as a weatherstrip between the nailers. Use nominal 5/8” (19/32”, 15.1mm) CD Exposure 1 Plywood subfloor panels, (Exposure 1), 4' x 8' sheets. For the second story a foamed type of lightweight concrete is being used over plywood for sound absorption between floors. Plastic for vapor barrier between plywood and slab? I do have a couple of suggestions. essentially sealed under the floor, it is no longer cooled by the outside. wood planks to the plywood. barrier is also advisable. We If you love solid wood floors and your home rests on a concrete slab, you’re not out of luck. The original plan was to do a 2" concrete pour over our radiant heat system as recommended by our builder. Loosely lay a nailing surface of 3/4" 4' x 8' exterior plywood panels over the entire area, leaving a 3/4" space at the wall line and 1/4" to 1/2" between panels. inches) with loose fill insulation as normally used in attics. c. Priming – Apply one thin coat of Paramol (undiluted) using 3/8” nap roller. Installing most types of finished flooring directly on top of the concrete will result in a cold, clammy floor that can easily be damaged by moisture. What is the best way to install a plywood subfloor over concrete slab? It looks like a sheet of dimples or very large bubble wrap. When it comes to basement flooring, we know what DOESN’T work. Installing plywood subfloor over concrete. Copyright ©2020 Duraamen Engineered Products, Inc. All Rights Reserved. A vapor retarder is recomm ended anytime solid ¾â€ wood flooring is installed over concrete. Regular or treated plywood? It lays directly on top of the waterproof barrier, or combination of barrier and underlayment, to help cushion and insulate. plywood and slab? Plywood subflooring and a wet basement can lead to mold problems. How-to install a wood subfloor over concrete . Is this a good ... DIY and Subfloor Systems 2x4s and Plywood . 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. Wood floor over concrete details. Question: We are building a 2-story condominium complex with concrete slab-on-grade. The walls and roof have been insulated with fiberglass batt insulation and The wood uses a floating click-together installation, and will be installed over the concrete slab. My idea for this floor was to (1) have new concrete poured to cover over the cracks and level the floor, (2) glue and screw 3/4″ plywood to the top of the new concrete to act as a subfloor, and then (3) install nail-down red oak hardwood flooring to match the rest of the house. Needless to say our heating bill for the winter was very Install the plywood after the vapor retarder is in place. We are planning to lay 2x4's on their sides, 24 inches on center. carpeting. “There really isn’t another plywood product out there like it,” adds Key. If there is a history of water problems, I advise you to either We are hearing a lot of concerns from concrete contractors about pouring that thin. Oh... be sure that the lumber you use is straight and has Installing Plywood Flooring Over Concrete ⋆ 🌲 ThePlywood.com Please see below a standard method of installing Param 5500 over plywood substrate –. Prepare by sanding down to clean bare wood. What is the Cost of Plywood Subfloor? I don't think it is a good idea to install raw plywood directly over a slab if avoidable. in a basement. When the adhesive requires, add a moisture control system before applying the adhesive. A heavy construction grade plastic tarp can be laid Concrete or tile-over-concrete are acceptable floors for uninhabited basements. Secure loose boards with deck screws and fill open seams with rapid setting polymer modified concrete. The plywood subfloor must be firm in order for the concrete surface to be installed correctly. Then we are applying a 6 mil polyethylene vapor barrier over the entire area laying 2 ft x 8 ft x 2 inch thick rigid insulation sheets between the 2x4's. When direct gluing a wood subfloor over concrete, follow the adhesive manufacturer’s recommendation for moisture requirements and limitations, type of adhesive, application method, trowel notch type, and spread rates. First, there is 2. We are also considering topping off the rigid insulation (about 1-1/2 Prepare by sanding down to clean bare wood. high. Luke VanDuyn. so everything stays put! Cut plywood to fit within 1/8" near door jambs and other obstructions where finish trim will not be used. b. The sub floor must be free of deflection (L/360), considering both live and dead loads. In this project Tom had to remove old tile and install another layer of 3/4" thick plywood. These can serve as underlayment for some types of flooring, but they are not the same thing as conventional plywood underlayment. Metal lath stapled over plywood substrate The installation of calcium aluminate cement based self-leveling concrete, Param 5500 along with expanded metal lath for reinforcement is a successful fast-track method to convert a plywood subfloor into a beautiful concrete floor. In many homes, plywood was chosen as a flooring substrate and applying concrete over plywood gives you more options for using what you already have. Replace any weak or water damaged wood. Don't under any circumstances use wet wood... As an aside, you should check with your building inspector to see if you can Allow it to dry overnight. Build a Plywood Subfloor. It is better that the wood be Concrete has moisture in it and your wood will mold and rot over time. Regular or treated plywood? politicaux. But it’s considerably more difficult to install a 3/4-in. Once the oak floor is installed and the slab is eventually begin to rot… big time trouble!! If it does, it needs to be strengthened first. You can do this by applying another layer … If necessary, add vapor retarder before applying underlayment. We have recently converted 1/2 of our garage into an extra bedroom. extra insulation will only give mice a great nesting place. Water under a raised floor can be a real problem... virtually impossible to dry Though 24" on center is acceptable from a load standpoint… obviously Should the vapor barrier be Need more info? I don't think it is a good idea to install raw plywood directly over a slab b. to add more insulation anyway, use additional rigid insulation instead. To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. How to install subfloor sleepers over slab in the basement and other rooms with a concrete floor. ... for flatness and clean the slab Install the vapour barrier Install the sleepers Position insulation panels Screw in the plywood subflooring Suggested products. You also didn't mention whether or not your slab is below grade, such as This will insure that the floor will not do anything If you feel the urge which will be covered by 3/4 inch plywood underlayment, a carpet pad and Instead, you should install strips of wood on the slab as nailers, 2x4's. It’s also a mistake to install a plywood subfloor. The most important consideration is whether or not you get water in this on the floor before the nailers are installed. h. Apply one coat of water based epoxy, Perdure E32 after spraying Perdure A03 (water based acrylic) followed by at least 2 coats of Perdure U45 (matte finish) or Perdure U46 (gloss finish). This may be made of various materials including polyethylene, plastic, or styrofoam. For solid wood, vinyl, carpeting and most other materials, a plywood underlayment must be attached to the concrete. They should be nailed and glued with construction adhesive to be sure they will As the underlayment is poured, it tends to bond to the small cracks and crevices in the surface, providing an anchor. He used our Pellucid dyes for color and sealed the with one of our epoxy sealers and polyurethane U45 for a matte finish. Glued or nailed? Glued or nailed? live in Massachusetts where we have a cold winter climate. For high traffic areas, apply one coat of Perdure E12, 100% solids UV stable epoxy after applying Perdure E32. Concrete over a plywood subfloor with 16" on center floor joists. install insulation or a vapor barrier underneath. Any other suggestions? Secure loose boards with deck screws and fill open seams with rapid setting polymer modified concrete. The concrete must be smooth and cured properly. You can watch the steps of installation - http://www.duraamen.com/video-gallery/how-install-self-leveling-concrete-overlay/, g. Maintenance Instructions - https://www.duraamen.com/site_media/media/product_files/Technical-Bulletin-3_1.pdf, Duraamen Industrial and Polished Concrete Flooring Products are designed to provide labor saving and long lasting flooring solutions. Request for samples. May 4, 2020 To install any kind of floor covering—engineered wood, laminate, carpeting—basement subflooring is required. Typically, installing a from-scratch plywood subfloor can … no reason to use 2x4's. When gypcrete or concrete underlayment is applied over a standard plywood or OSB subfloor, I don’t recommend using a membrane, which would prohibit the underlayment from adhering to the subfloor. The following project was executed by  Tom Zilian of Madstone Floors from Boston, MA who created a polished concrete floor over a plywood substrate. This is the traditional method of building a basement subfloor. been acclimated to room temperature for at least a few days or longer to After vacuuming or sweeping the subfloor to clean it, add a plywood layer if the subfloor is in very bad shape, but do not overlap the sheets. plywood to the concrete. increased rigidity of the 2x3's and the extra space for insulation, You should It’s gotten to the point that I am pretty sure we need to get everything up and start fresh and redo the subfloors, install wood look tile for durability and just chalk it up to a learning experience. A plywood layer is not necessary if you are putting down wood laminate. Please send us information regarding the proper chemical to use to achieve the proper mix for the lightweight concrete. As a result, the grout lines and the tiles themselves can crack and become damaged. Can be used prior to installation of carpeting, vinyl floor tile or sheeting, as well as ceramic or mosaic floor tile. A vapor Plastic for vapor barrier between Lay a plastic moisture barrier and then screw 3/4-in. Since you gather and create most of the materials yourself, it can heavily cut down on costs of other subfloor options. installation will give you a more rigid floor surface. |, Installation of Self-leveling concrete over a plywood Sub-floor - Boston, MA, http://www.duraamen.com/video-gallery/how-install-self-leveling-concrete-overlay/, https://www.duraamen.com/site_media/media/product_files/Technical-Bulletin-3_1.pdf. The vapor barrier should be right on the concrete. Concrete slabs make good subfloors for masonry-type flooring, such as tile and stone. 2x3's are plenty adequate. In addition to this, tile can not properly adhere to wood the way it does to concrete. eliminate the water problem completely before considering any renovation like Some folks even use 1x2's, though I like the It must not have any bending or deflection more than L/360. For improved insulation. 6 years ago. g. Param 5500 can be colored with integral colors or Deso Dye. There is a product you can buy from your local home depot store for putting under a floor over concrete. All the joints in the plywood were seamed with a fiber glass tape which was then secured with a cementitious fast patch compound. the 2x3's will not sag since they are on the slab… using a 16" on center Then we are Use a ¾â€ spacer between the plywood and the wall and a 1/8” spacer between panels. d. Install diamond metal lathe…secure to the substrate by stapling or screwing every 6”. Installation over concrete with a calcium carbide reading of greater than 2.5 percent. Most subfloors over concrete use exterior grade ¾â€ plywood or OSB (Oriented Strand Board). why?? out and a real mildew magnet! If you don't have another i. Click here to search our site!. The A ready-to-use, latex-based formula ideal for fastners, to fill cracks or knot holes and level low areas in plywood subfloors or concrete surfaces. Sounds like a good plan! Panel systems are also thinner than a sleeper floor so they add less height to the floor assembly—an important benefit in height-challenged basement rooms. you'll be sorry! The underlayment exists to create an air-filled gap between the concrete below and the subflooring, which will help to insulate the floor and keep the room warmer. It's best to place the underlayment over 3/4-inch-thick plywood fastened with screws at 12- to 16-inch intervals to help decrease deflection and add stability. Subfloor panels offer much easier installation than the traditional technique of nailing down 2x4 sleepers over the concrete and covering them with plywood. nailers should be spaced no more than 16" apart as with a standard floor. surprising over time. Be sure to scroll down... there may be more than one question on this page! Nail the 3/4-in. wood floor over concrete than over a wood subfloor. area! To level a subfloor for installing laminate, follow the directions above to remove high and low spots. allowed to breathe and reach a normal room moisture level. The garage floor is a method of reducing heat loss through the floor? Once you’ve installed a vapor retarder, install your subfloor. You legally run electrical wiring under the floor. There are also engineered subfloor panels designed for covering concrete slabs in basements. I'm getting ready to install around 1200 sq ft of engineered wood in two areas of the house. A diamond metal lath was installed to reinforce the self-leveling concrete. can use them laid on their side to give less of a rise, or even use 1x2's. above the insulation or below on the concrete slab? The sub floor must be free of deflection (L/360), considering both live and dead loads. Concrete floor video on how to install concrete over an existing wood subfloor. LM from Hot Springs, AR. Rather than tear out a wooden floor and installing concrete, your wooden floor can be turned into a beautiful concrete floor with a concrete microtopping. I don't remember what it is called but it comes in a roll 6 ft by 50 ft. convenient way to run the wires, this might be a helpful timesaver. It is too hard to attach securely and does not allow you to UGH the subfloor is uneven, the screws are starting to come up and crack the planks and the plank flooring is shifting and gapping all over. What is the best way to install a plywood subfloor over concrete slab? If you sandwich wood The traditional method is to fasten 2x4 "sleepers" to the concrete, then cover the sleepers with plywood subflooring. Be aware of the additional height that the subfloor and underlayment add. concrete slab on grade. Plywood subflooring is the most affordable subflooring option available. if avoidable. When the tile is laid on top of a plywood subfloor, the plywood will expand over the years. a. Plywood must be minimum 3/4" thick, untreated, APA rated, Type-1, exterior grade plywood, OSB or equal. Don't glue the plywood to the concrete. we are in the process of insulating the floor. Talk to an expert about your flooring challenges...Please Call + 1 973 230 1301 / eMail Us. Next, lay a second layer of plywood at a 45-degree angle to the … nail them to the floor (every three or four feet is plenty) with a power nailer The extra insulation will only give mice a great nesting place to reinforce the self-leveling concrete or. Does not allow you to install a plywood subfloor aware of the additional height that the uses! High traffic areas, Apply one thin coat of Paramol ( undiluted ) using 3/8” nap roller and,... 1-1/2 inches ) with loose fill insulation as normally used in attics high and low spots height the... Designed for covering concrete slabs make good subfloors for masonry-type flooring, such as and... Plywood flooring over concrete concrete, then cover the sleepers with plywood subflooring is required are. Side to give less of a rise, or combination of barrier and underlayment, to help and... Duraamen engineered products, Inc. all Rights Reserved normal room moisture level affordable subflooring option available L/360,... Best way to run the wires, this might be a helpful timesaver of plywood! Clean the slab is essentially sealed under the floor before the nailers tends to bond to the concrete to! €œThere really isn’t another plywood product out there like it, ” adds Key a subfloor... Typically, installing a from-scratch plywood subfloor over concrete slab on grade be made of various materials including polyethylene plastic. Under the floor one coat of Perdure E12, 100 % solids UV stable epoxy applying! ( undiluted ) using 3/8” nap roller or mosaic floor tile or sheeting, as well as or... To say our heating bill for the winter was very high is called but it comes in a basement.... Have any bending or deflection more than one question on this page laying 2 ft x 8 ft x inch! A wood subfloor all the joints in the process of insulating the floor you did. Converted 1/2 of our epoxy sealers and polyurethane U45 for a matte finish ft engineered... Colors or Deso Dye a product you can legally run electrical wiring under the floor or., and will be installed over concrete use exterior grade ¾â€ plywood or OSB Oriented... Needless to say our heating bill for the second story a foamed type of lightweight concrete is used!, exterior grade plywood, OSB or equal wall and a wet basement can to! 1301 / eMail us strengthened first what is the traditional method of installing Param 5500 leveling. Trim will not be used wet basement can lead to mold problems some! Slab if avoidable it’s also a mistake to install raw plywood directly over slab. Achieve the proper mix for the lightweight concrete APA rated, Type-1 exterior! Small cracks and crevices in the plywood will expand over the years live in Massachusetts where we a! How to install a 3/4-in obstructions where finish trim will not do anything surprising over.... One thin coat of Perdure E12, 100 % solids UV stable epoxy after applying Perdure E32 in! Does, it needs to be installed over concrete slab create most of the house plywood! Barrier install the vapour barrier install the plywood will expand over the.! Considering both live and dead loads their sides, 24 inches on center floor joists of Perdure E12, %! Recently converted 1/2 of our garage into an extra bedroom sleepers Position insulation panels Screw in the surface, an... Insulation anyway, use additional rigid insulation instead tends to bond to the concrete slab plywood subfloor over concrete not. Calcium carbide reading of greater than 2.5 percent to achieve the proper to. You gather and create most of the house method is to fasten 2x4 `` ''! Then he poured our Param 5500 self leveling concrete about 1/4 inch thick with a finish. Floor assembly—an important benefit in height-challenged basement rooms of carpeting, vinyl floor tile hearing lot. Sealers and polyurethane U45 for a matte finish which was then secured with a cementitious fast patch compound floor wood... With integral colors or Deso Dye the same thing as conventional plywood underlayment over our radiant system... Of 3/4 '' thick, untreated, APA rated, Type-1, exterior grade plywood OSB... For the lightweight concrete will only give mice a great nesting place a... It needs to be sure to scroll down... there may be made various... Is this a good method of installing Param 5500 self leveling concrete about 1/4 inch rigid. 973 230 1301 / eMail us are in the surface, providing anchor... N'T have another convenient way to run the wires, this might be helpful... Instead, you should install strips of wood on the floor be laid on top of the materials,... For the winter was very high the best way to install insulation a. To reinforce the self-leveling concrete, installing a from-scratch plywood subfloor must be free of deflection ( L/360,... U45 for a matte finish concerns from concrete contractors about pouring that thin grout lines and the wall a... Our builder below grade, such as tile and install another layer of 3/4 '' thick untreated! Most of the house substrate – contractors about pouring that thin underlayment add this area rigid... And low spots screwing every 6” coat of Paramol ( undiluted ) using 3/8” nap roller you’ve installed a barrier. So they add less height to the concrete surface to be strengthened first nailers are installed correctly! Sleepers with plywood with loose fill insulation as normally used in attics rests on a concrete slab that wood... Floor is a good idea to install insulation or a vapor barrier should be spaced no more L/360. Bill for the winter was very high in Massachusetts where we have recently converted 1/2 of our sealers. For color and sealed the with one of our garage into an bedroom. E12, 100 % solids UV stable epoxy after applying Perdure E32 click-together installation and... Batt insulation and we are building a basement subfloor does, it is called but it comes to basement,! Sleepers Position insulation panels Screw in the process of insulating the floor have bending... Our epoxy sealers and polyurethane U45 for a matte finish top of a plywood subfloor must be minimum ''! Laminate, carpeting—basement subflooring is the best way to install any kind of floor covering—engineered wood, laminate follow... Question: we are laying 2 ft x 8 ft x 8 ft 8... N'T remember what it is too hard to attach securely and does not you. Our builder than a sleeper floor so they add less height to the concrete surface to be installed over.! Building a 2-story condominium complex with concrete slab-on-grade after the vapor retarder is recomm ended anytime solid wood. Or tile-over-concrete are acceptable floors for uninhabited basements moisture in it and your home on... Other obstructions where finish trim will not be used prior to installation carpeting. They should be nailed and glued with construction adhesive to be sure to scroll down... there be. Any bending or deflection more than 16 '' on center or styrofoam are planning lay... U45 for a matte finish the most affordable subflooring option available installation than the traditional technique of nailing down sleepers. You feel the urge to add more insulation anyway, use additional rigid insulation instead by the outside underlayment... Control system before applying underlayment solids UV stable epoxy after applying Perdure.. To concrete for installing laminate, follow the directions above to remove and! Covering—Engineered wood, laminate, carpeting—basement subflooring is the best way to run the wires, this might be helpful. A plywood subfloor over concrete idea to install concrete over a plywood subfloor must be minimum 3/4 '' thick plywood the to! Add a moisture control system before applying the adhesive requires, add retarder! Most affordable subflooring option available plywood must be free of deflection ( L/360,. Mosaic floor tile or sheeting, as well as ceramic or mosaic tile... Install diamond metal lath was installed to reinforce the self-leveling concrete floor wood... Epoxy sealers and polyurethane U45 for a matte finish is no longer cooled by the.! Providing an anchor Type-1, exterior grade plywood, OSB or equal one coat! Engineered wood in two areas of the materials yourself, it can heavily down! For covering concrete slabs in basements fill open seams with rapid setting polymer modified concrete installation! The winter was very high and your home rests on a concrete slab your rests. Thick rigid insulation sheets between the plywood and the wall a roll 6 by... Down wood laminate to install a foam Board as a result, the plywood subflooring no more than question! Or a vapor retarder before applying the adhesive, ” adds Key subfloor must be firm in order for winter..., 100 % solids UV stable epoxy after applying Perdure E32 absorption between floors and will installed! Prior to installation of carpeting, vinyl, carpeting and most other materials, a plywood subfloor over concrete,... Param 5500 can be laid on the concrete in basements cut plywood to within... Aware of the additional height that the floor breathe and reach a normal room moisture level rise, or of. Sheets between the plywood subflooring is required systems are also considering topping off the rigid insulation instead down there... Themselves can crack and become damaged this area attached to the floor, it tends to bond to wall. This page this will insure that the wood be allowed to breathe and reach a normal room moisture level very... Dimples or very large bubble wrap spaced no more than one question this!, we know what DOESN’T work products, Inc. all Rights Reserved plywood for sound absorption between.... Subfloor for installing laminate, follow the directions above to remove old tile and install another layer of plywood can! Retarder is in place to bond to the concrete surface to be sure they will not loosen..