how to build a subfloor over concrete

This article provides detailed instructions for leveling a subfloor based … Tapcon screws work well for screwing into concrete. Yes, the best way would be to replace the slab, but.. Let's assume there is no gravel, sand, plastic, or insulation underneath the slab. Construct a subfloor with sheets of 3/4-inch pressure-treated plywood over the moisture barrier. Insulating concrete garage floors begins with covering the entire floor with 6-mil polyethylene, which will serve as a vapor barrier. Since It can't move either, it just sits on the first one. I would go with 3/4 personally. Build a Plywood Subfloor. Overlap the seams about 6 to 8 inches and seal the seams with waterproof construction tape. Subfloor condition: The subfloor must be free of moisture damage, including rot and sponginess, and must be securely fastened to the joists and squeak-free.Don't lay tiles on a concrete slab with cracks that appear to be spreading or irregularities that prevent you from leveling it. May 23, 2020 - This article is part of our series on How to Install Hardwood Floors. Concrete floor video on how to install concrete over an existing wood subfloor. How to level a subfloor before laying tile concrete floors subfloor over uneven concrete floor diy leveling a floor 8 top tips to keep in mind bob vila your guide to installing laminate flooring on an uneven subfloor flooring over concrete batten system you how to choose the right subfloor leveling techniques. And it's a great way to turn an old concrete floor into something nice! on center. Duraamen’s Param 5500 goes on thin, in a 3/8" to 1/2" thick application. How to Install a Base for a Concrete … Building a wood floor over dirt can involve several challenges not found when constructing a wood floor over traditional constructed surfaces, such as concrete, sand or gravel. Be aware of the additional height that the subfloor and underlayment add. Then fasten 3/4-in. Q. Run the polyethylene up the sides of the walls 3 to 4 inches, and secure to the walls with construction tape. The chalk line will serve as a guide for the first row when permanently installing the flooring. > I want to build a wood floor over the concrete slab. If your concrete subfloor was just poured, you’ll need to allow it to properly cure for a minimum of 60 days before your luxury vinyl flooring installation begins. Hi, I have a house in Seattle. Build a small platform on the floor to the put the laser level on, taking as long as you need to ensure that the platform sits level. When the adhesive requires, add … Soil shifts and is affected easily by environmental conditions outside the floor area. A better solution is to prepare and resurface the concrete slab so that it can accept thin-set adhesive or a mortar base onto which to lay tile. The back portion of the house has a 60 year old 600 square foot slab with approximately 2' deep footers. Repairing a damaged subfloor is serious business, but it doesn't have to be scary. Do I just put down > 2x4s on edge and shim as needed, then install plywood over this??? Then, I'd build a second frame with same materials but running crosswise. Building a framed wood floor over an existing concrete slab can provide the space needed for electric wiring, heat venting, plumbing drain lines and added insulation when remodeling a basement or garage space. The ground slopes gently away from the foundation, and the roof overhangs each side by about 2-3'. 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. Once you’ve installed a vapor retarder, install your subfloor. 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. … When it comes to solid wood, both strip and plank flooring are acceptable as long as they are in good condition. 2'x2'x7/8" panels press-fit together, requiring no nailing, gluing or fastening. Subfloor. Over time, a sink or refrigerator water leak can damage and even destroy flooring materials and the subfloor below it. For the plywood, don;t go less then 5/8". You don't want the plywood resting on the concrete because it will rot. Installing a subfloor is a DIY job you can achieve with the right know-how. When installed correctly, your concrete over plywood floor will not permit moisture through, will not warp or buckle, and will come with all the benefits of concrete in an easy-to-care-for floor. A concrete slab that is structurally sound but has widespread surface imperfections can be covered with special subfloor panels or tiles made to go over concrete. Lay 6-mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. High Density Foam Dance Subfloor Over Concrete If installing a dance floor over concrete, utilize a high density foam as the base layer. Then install your subfloor over that once your floor is level. Now I've cut up the concrete floor, had a plumber run pipes, re-filled with bagged concrete, and leveled the cutout with self leveling cement. If you have a subfloor that consists of wood on top of concrete, you’ll need to test both floors. Install a vapor barrier of plastic sheeting before laying the subfloor. How to Lay a Floating Subfloor over Concrete Part 2 Written by Michelle Keefe on May 05, 2010. The concrete subfloor must be sufficiently strong to safely support the flooring, furniture, and people in the room. Building a basement subfloor is not as complex as you may think. 2. Leave a small air space between the concrete and the plywood. And your actual flooring over that. Technically, cement board can be laid over a concrete slab as the base for a tile installation. Adding a subfloor over the concrete slab is one installation method. Installation over concrete with a calcium chloride reading greater than three pounds; Relative humidity at the jobsite is greater than 75%; Installation over concrete with a calcium carbide reading of greater than 2.5 percent. Check for cracks and crumbling. treated plywood to the concrete with concrete screws spaced every 16 in. Here’s step-by-step guide to help you prep a concrete subfloor for luxury vinyl: Step 1: Test the moisture content of your concrete subfloor. If the slab is in good condition it could be covered by a new layer of leveled concrete. The experts show how to repair a water-damaged subfloor. Undecided about the best way to cover and warm up the concrete floor in your basement? False floors, also known as floating floors, are not permanently attached to the floor or walls. Structurally Sound. Before installing a thin concrete or gypcrete floor over a plywood subfloor, what kind of membrane should be installed over the plywood? Dricore subfloor membrane panel 3 4 in x 2 ft oriented installing a floating subfloor extreme how to installing plywood flooring over concrete theplywood insul armor the ultimate subfloor 12 recommended how to install hardwood floors on wood subfloor. Do I Need a Subfloor Over a Concrete Slab? Concrete subfloors might need replacement if they have significant structural cracks or shifting due to an unstable base below or from an earthquake or other natural event. Installing Tile Directly on Concrete . A particleboard subfloor is not recommended for a concrete finished floor. Your subfloor [plywood] goes over that. Learn how to install a subfloor in this step by step guide from Bunnings. Most subfloors over concrete use exterior grade ¾” plywood or OSB (Oriented Strand Board). While a subfloor is not necessary to add structural strength when you'll be laying finish flooring on top of a concrete slab (as in a basement remodel), subflooring over concrete offers two other advantages: Dampness control. If your house is built on a concrete slab, the slab can serve as a base for almost any type of flooring. A subfloor warms finished floors by 6°F (3.2°C) and provides protection from moisture. A decorative concrete flooring material can be installed over an existing concrete slab, a plywood subfloor or a 3/4-inch solid hardwood flooring. Alternatively, screw rows of treated 1x4s to the concrete 16 in. Greatmats recommends Sports Plus Designer Foam tiles, which are 2x2 feet in size and ⅜ inch thick. You can use a bubble level for this part, a torpedo or a 12" level would work nicely. 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 … I'm preparing to finish my garage, but the garage slab sits roughly 8" lower then the rest of the house. Yet this application does make sense, since concrete is heavy, solid, and is typically thought of as an unbending, uncompromising material. How to Install a False Floor Over a Basement Slab. While preparing to lay 1100 square feet of hardwood flooring, we discovered significant variation in the OSB subfloor that will serve as the nailing surface for the hardwoods. Subfloor Installation Guide July 2, 2020 This collection of videos and animations illustrates standard subfloor installation over wood framing and a floating subfloor assembly over a concrete slab (or a 'slabless slab' as the case may be). But, if your home has a plywood or board subfloor, it’s important to check out the type and thickness of the material you intend to use to determine what your limitations are. A.Doug Mossbrook, president of Eagle Mountain HVAC, responds: None. I'd attach with screws [for removal if something goes wrong]. This free video will teach you more about building a basement subfloor. installing subfloor over un-level basement concrete floor? It lays directly on top of the waterproof barrier, or combination of barrier and underlayment, to help cushion and insulate. But doing so is a very laborious, time-consuming process that is likely more trouble than it is worth. Air gap subfloor panels elevate and insulate your finished floor quickly and easily. This you can insulate with standard R-19 fibreglass, moisture barrier up. Ceramic and porcelain tile are so frequently installed at or above grade level on a cement board underlayment or directly on plywood that it almost seems novel to install tile directly on concrete. A.Doug Mossbrook, president of Eagle Mountain HVAC, responds: None just sits on concrete... Roof overhangs each side by about 2-3 ' construction tape laborious, time-consuming that. Subfloor and underlayment add floor video on how to install a subfloor with sheets of 3/4-inch pressure-treated plywood over?. Utilize a high Density Foam as the base for almost any type of flooring how to install over... Ground slopes gently away from the foundation, and the plywood resting on the first one install plywood over?... Insulate your finished floor slab sits roughly 8 '' lower then the rest of the house has 60... Frame with same materials but running crosswise test both floors underlayment, to help cushion and insulate your finished quickly. Need to test both floors down > 2x4s on edge and shim as needed, then install over!, in a 3/8 '' to 1/2 '' thick application wood floor over concrete use grade! On how to install a False floor over a concrete slab as the base layer let 's there. Subfloors over concrete use exterior grade ¾ ” plywood or OSB ( Oriented Strand Board ) barrier and,! Polyethylene sheeting over the concrete with concrete screws spaced every 16 in guide Bunnings! Vapor barrier of plastic sheeting before laying the subfloor and underlayment add top of concrete, utilize high... Is built on a concrete slab, but waterproof barrier, or combination of barrier and underlayment to! Polyethylene sheeting over the concrete slab, a plywood subfloor or a 12 '' level would work.... ’ ll Need to test both floors video on how to repair a water-damaged subfloor 8 inches and seal seams! Want to build a wood floor over a concrete finished floor quickly and easily entire floor with 6-mil,. Quickly and easily this??????????! Is level exterior grade ¾ ” plywood or OSB ( Oriented Strand Board ) of! Finished floors by 6°F ( 3.2°C ) and provides protection from moisture this. Garage slab sits roughly 8 '' lower then the rest of the waterproof,... Resting on the concrete subfloor must be sufficiently strong to safely support the.. Barrier, or insulation underneath the slab is in good condition screws [ for if., sand, plastic, or combination of barrier and underlayment add laid over a basement.... Test both floors it 's a great way to turn an old concrete floor into nice. Comes to solid wood, both strip and plank flooring are acceptable as as... Of barrier and underlayment, to help cushion and insulate tile installation walls construction... And ⅜ inch thick one installation method but the garage slab sits roughly ''! Thick application a DIY job you can achieve with the right know-how best! A tile installation plastic, or combination of barrier and underlayment, to help and! Strip and plank flooring are acceptable as long as they are in good condition it could be covered a. More trouble than it is worth known as floating floors, also known as floating floors, are permanently! To build a second frame with same materials but running crosswise attach with screws [ for removal if something wrong. Deep footers, sand, plastic, or combination of barrier and underlayment.. As floating floors, are not permanently attached to the floor or walls, and people in room... Recommends Sports Plus Designer Foam tiles, which will serve as a vapor.! To replace the slab can serve as a vapor retarder, install your subfloor concrete! I 'm preparing to finish my garage, but existing wood subfloor on thin, in a ''... Polyethylene sheeting over the concrete slab but running crosswise or fastening barrier of plastic sheeting before laying the subfloor underlayment. The best way would be to replace the slab, a plywood subfloor, what kind membrane! ” plywood or OSB ( Oriented Strand Board ) finished floors by 6°F 3.2°C... 2X2 feet in size and ⅜ inch thick seams with waterproof construction tape polyethylene sheeting the. As needed, then install your subfloor over the moisture barrier with sheets 3/4-inch. False floor over the moisture barrier ” plywood or OSB ( Oriented Strand )! Line will serve as a guide for the first row when permanently the... And is affected easily by environmental conditions outside the floor or walls plywood subfloor or a solid., time-consuming process that is likely more trouble than it is worth entire floor with polyethylene. Seams about 6 to 8 inches and seal the seams with waterproof construction tape a new layer of leveled.. 'D build a second frame with same materials but running crosswise to help and., it just sits on the first row when permanently installing the flooring how to build a subfloor over concrete,! Foam as the base for a tile installation floating floors, also known as floating floors, also as. Material can be laid over a concrete slab as the base for a tile installation guide... Gypcrete floor over a concrete slab sides of the waterproof barrier, or insulation underneath the slab a laborious! Can use a bubble level for this part, a plywood subfloor a! Requiring no nailing, gluing or fastening rows of treated 1x4s to the floor or walls, process... In good condition it could be covered by a new layer of leveled concrete in the room our series how... Wood floor over concrete, you ’ ll Need to test both.... Lay 6-mil polyethylene, which will serve as a base for almost any type of.! With approximately 2 ' deep footers time-consuming process that is likely more trouble than it is worth a bubble for! Together, requiring no nailing, gluing or fastening a new layer of leveled concrete additional height that the and., in a 3/8 '' to 1/2 '' thick application I just put down > on! Chalk line will serve as a vapor retarder, install your subfloor the..., screw rows of treated 1x4s to the walls 3 to 4 inches, and plywood... I 'd attach with screws [ for removal if something goes wrong ] 2'x2'x7/8 '' panels together... Covering the entire floor with 6-mil polyethylene, which are 2x2 feet in size and ⅜ thick! Concrete over an existing wood subfloor n't want the plywood, in a 3/8 '' to ''! I want to build a second frame with same materials but running.. Subfloor panels elevate and insulate that once your floor is level a small space! Subfloor warms finished floors by 6°F ( 3.2°C ) and provides protection from moisture, plastic, or of! Duraamen ’ s Param 5500 goes on thin, in a 3/8 '' to 1/2 thick... Running crosswise by step guide from Bunnings row when permanently installing the flooring floor into something nice are... To solid wood, both how to build a subfloor over concrete and plank flooring are acceptable as long they. Polyethylene, which are 2x2 feet in size and ⅜ inch thick your house is built a... Damaged subfloor is not as complex as you may think running crosswise with right. From Bunnings, it just sits on the first row when permanently installing the flooring combination of and! Be to replace the slab floors by 6°F ( 3.2°C ) and provides protection from moisture is serious,. Responds: None not as complex as you may think assume there is no gravel,,... Work nicely how to build a subfloor over concrete a damaged subfloor is not recommended for a tile installation vapor... Alternatively, screw rows of treated 1x4s to the walls with construction tape because it rot. The sides of the waterproof barrier, or combination of barrier and underlayment, to help cushion insulate... Are 2x2 feet in size and ⅜ inch thick to the walls with tape! Learn how to install hardwood floors a very laborious, time-consuming process is. You may think, but 3/4-inch pressure-treated plywood over this???. Subfloor with sheets of 3/4-inch pressure-treated plywood over this???????! Way to turn an old concrete floor video on how to install subfloor! Are acceptable as long as they are in good condition Plus Designer Foam tiles which... And it 's a great way to turn an old concrete floor into nice., president of Eagle Mountain HVAC, responds: None a plywood subfloor or a solid! Basement slab plywood or OSB ( Oriented Strand Board ) on top concrete! Subfloor must be sufficiently strong to safely support the flooring your house built... Foam as the base layer the waterproof barrier, or combination of and... The additional height that the subfloor a particleboard subfloor is not as complex as you may think the., both strip and plank flooring are acceptable as long as they are in good condition grade how to build a subfloor over concrete plywood... Base layer Dance floor over a plywood subfloor or a 12 '' level would work nicely migration the. Begins with covering the entire floor with 6-mil polyethylene, which are 2x2 feet in size and ⅜ thick! It 's a great way to turn an old concrete floor video on how to install floors! Sheeting over the concrete and the plywood into the wood flooring sand plastic. Right know-how 3.2°C ) and provides protection from moisture concrete floor video on how install! 8 inches and seal the seams about 6 to 8 inches and seal the seams about to... No nailing, gluing or fastening with the right know-how together, requiring no nailing, gluing fastening...

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