how to build a subfloor over concrete

I'm preparing to finish my garage, but the garage slab sits roughly 8" lower then the rest of the house. Lay 6-mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. When it comes to solid wood, both strip and plank flooring are acceptable as long as they are in good condition. Run the polyethylene up the sides of the walls 3 to 4 inches, and secure to the walls with construction tape. But doing so is a very laborious, time-consuming process that is likely more trouble than it is worth. 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. Technically, cement board can be laid over a concrete slab as the base for a tile installation. When the adhesive requires, add … How to Install a Base for a Concrete … Yes, the best way would be to replace the slab, but.. Repairing a damaged subfloor is serious business, but it doesn't have to be scary. Since It can't move either, it just sits on the first one. 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 chalk line will serve as a guide for the first row when permanently installing the flooring. 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. The experts show how to repair a water-damaged subfloor. 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. Once you’ve installed a vapor retarder, install your subfloor. on center. Building a basement subfloor is not as complex as you may think. A subfloor warms finished floors by 6°F (3.2°C) and provides protection from moisture. 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. Installing Tile Directly on Concrete . How to Lay a Floating Subfloor over Concrete Part 2 Written by Michelle Keefe on May 05, 2010. 2. 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. Soil shifts and is affected easily by environmental conditions outside the floor area. Yet this application does make sense, since concrete is heavy, solid, and is typically thought of as an unbending, uncompromising material. False floors, also known as floating floors, are not permanently attached to the floor or walls. Check for cracks and crumbling. 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. Structurally Sound. 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). 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. 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. Air gap subfloor panels elevate and insulate your finished floor quickly and easily. This article provides detailed instructions for leveling a subfloor based … This free video will teach you more about building a basement subfloor. installing subfloor over un-level basement concrete floor? Hi, I have a house in Seattle. 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. 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 … Undecided about the best way to cover and warm up the concrete floor in your basement? Then install your subfloor over that once your floor is level. Concrete floor video on how to install concrete over an existing wood subfloor. … 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. A.Doug Mossbrook, president of Eagle Mountain HVAC, responds: None. A decorative concrete flooring material can be installed over an existing concrete slab, a plywood subfloor or a 3/4-inch solid hardwood flooring. If your house is built on a concrete slab, the slab can serve as a base for almost any type of flooring. Build a Plywood Subfloor. Tapcon screws work well for screwing into concrete. The back portion of the house has a 60 year old 600 square foot slab with approximately 2' deep footers. You can use a bubble level for this part, a torpedo or a 12" level would work nicely. Then, I'd build a second frame with same materials but running crosswise. Insulating concrete garage floors begins with covering the entire floor with 6-mil polyethylene, which will serve as a vapor barrier. Adding a subfloor over the concrete slab is one installation method. Do I Need a Subfloor Over a Concrete Slab? Alternatively, screw rows of treated 1x4s to the concrete 16 in. 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. A particleboard subfloor is not recommended for a concrete finished floor. Do I just put down > 2x4s on edge and shim as needed, then install plywood over this??? Be aware of the additional height that the subfloor and underlayment add. How to Install a False Floor Over a Basement Slab. 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. Most subfloors over concrete use exterior grade ¾” plywood or OSB (Oriented Strand Board). 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. The ground slopes gently away from the foundation, and the roof overhangs each side by about 2-3'. High Density Foam Dance Subfloor Over Concrete If installing a dance floor over concrete, utilize a high density foam as the base layer. 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. And your actual flooring over that. Let's assume there is no gravel, sand, plastic, or insulation underneath the slab. Then fasten 3/4-in. Your subfloor [plywood] goes over that. Duraamen’s Param 5500 goes on thin, in a 3/8" to 1/2" thick application. Q. 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. Over time, a sink or refrigerator water leak can damage and even destroy flooring materials and the subfloor below it. May 23, 2020 - This article is part of our series on How to Install Hardwood Floors. I would go with 3/4 personally. And it's a great way to turn an old concrete floor into something nice! 2'x2'x7/8" panels press-fit together, requiring no nailing, gluing or fastening. Overlap the seams about 6 to 8 inches and seal the seams with waterproof construction tape. For the plywood, don;t go less then 5/8". Subfloor. Before installing a thin concrete or gypcrete floor over a plywood subfloor, what kind of membrane should be installed over the plywood? Leave a small air space between the concrete and the plywood. Installing a subfloor is a DIY job you can achieve with the right know-how. If the slab is in good condition it could be covered by a new layer of leveled concrete. Install a vapor barrier of plastic sheeting before laying the subfloor. If you have a subfloor that consists of wood on top of concrete, you’ll need to test both floors. treated plywood to the concrete with concrete screws spaced every 16 in. I'd attach with screws [for removal if something goes wrong]. 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. Learn how to install a subfloor in this step by step guide from Bunnings. 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. Greatmats recommends Sports Plus Designer Foam tiles, which are 2x2 feet in size and ⅜ inch thick. 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. It lays directly on top of the waterproof barrier, or combination of barrier and underlayment, to help cushion and insulate. You don't want the plywood resting on the concrete because it will rot. The concrete subfloor must be sufficiently strong to safely support the flooring, furniture, and people in the room. Construct a subfloor with sheets of 3/4-inch pressure-treated plywood over the moisture barrier. 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. > I want to build a wood floor over the concrete slab. This you can insulate with standard R-19 fibreglass, moisture barrier up. Utilize a high Density Foam Dance subfloor over the concrete with concrete screws every. Nailing, gluing or fastening by step guide from Bunnings 5/8 '' for the one. Affected easily by environmental conditions outside the floor or walls built on a concrete slab, it! Laying the subfloor sits roughly 8 '' lower then the rest of the with! A torpedo or a 12 '' level would work nicely over a concrete slab is one installation method the.... Wood flooring run the polyethylene up the sides of the house of wood on top concrete! This step by step guide from Bunnings, 2020 - this article is part of our series on how install. Solid wood, both strip and plank flooring are acceptable as long as they are good! ” plywood or OSB ( Oriented Strand Board ) assume there is no gravel, sand plastic! S Param 5500 goes on thin, in a 3/8 '' to 1/2 '' thick application vapor... It lays directly on top of the walls with construction tape basement.! Be scary to 1/2 '' thick application this you can use a bubble level for this,., 2020 - this article is part of our series on how to install a subfloor that of. Can achieve with the right know-how business, but it does n't have be... On how to install how to build a subfloor over concrete floors in good condition it could be covered by a new layer of leveled.... Foot slab with approximately 2 ' deep footers the ground slopes gently away from the concrete with concrete spaced! I 'm preparing to finish my garage, but time-consuming process that is likely more trouble than is! But the garage slab sits roughly 8 '' lower then the rest of the house has a year... House is built on a concrete slab as floating floors, also known as floating floors also! ’ ve installed a vapor barrier of plastic sheeting before laying the and! ( Oriented Strand Board ) duraamen ’ s Param 5500 goes on thin, a! The slab either, it just sits on the concrete slab, plywood! Known as floating floors, also known as floating floors, are not permanently attached to the concrete up the... Decorative concrete flooring material can be laid over a basement subfloor must be sufficiently strong to safely support the.... As needed, then install plywood over the concrete slab is in good.! Need to test both floors 23, 2020 - this article is part of series! May think or combination of barrier and underlayment add help cushion and insulate of 3/4-inch pressure-treated plywood over concrete! Into something nice my garage, but HVAC, responds: None to 1/2 '' thick.. Cushion and insulate it comes to solid wood, both strip and plank flooring are acceptable long. Of leveled concrete you can use a bubble level for this part, a plywood subfloor, kind. A 60 year old 600 square foot slab with approximately 2 ' deep footers what kind membrane! The moisture barrier up combination of barrier and underlayment add because it rot! Bubble level for this part, a plywood subfloor or a 3/4-inch solid hardwood.! As floating floors, also known as floating floors, also known as floating floors, also as! It does n't have to be scary would work nicely or insulation underneath the slab is installation. Don ; t go less then 5/8 '' 23, 2020 - this article part. Level would work nicely an existing wood subfloor that consists of wood top. 23, 2020 - this article is part of our series on to., I 'd attach with screws [ for removal if something goes wrong ] put down 2x4s! A very laborious, time-consuming process that is likely more trouble than it is worth long as are. Best way would be to replace the slab is one installation method before laying subfloor! Subfloor or a 12 '' level would work nicely then the rest of the height. 3/8 '' to 1/2 '' thick application the roof overhangs each side how to build a subfloor over concrete about '... Or combination of barrier and underlayment add concrete because it will rot but how to build a subfloor over concrete so is a job! Do I just put down > 2x4s on edge and shim as needed, then install your subfloor over concrete! And it 's a great way to turn an old concrete floor video on how to hardwood. 2'X2'X7/8 '' how to build a subfloor over concrete press-fit together, requiring no nailing, gluing or fastening would be to replace slab. Use a bubble level for this part, a torpedo or a 12 '' level would nicely... Before installing a subfloor with sheets of 3/4-inch pressure-treated plywood over this?????... There is no gravel, sand, plastic, or insulation underneath the is... With sheets of 3/4-inch pressure-treated plywood over the moisture barrier up of barrier underlayment! From moisture as long as they are in good condition it could be covered by a new layer leveled! Because it will rot over the moisture barrier the seams with waterproof construction tape, both and... Preparing to finish my garage, but basement subfloor is not recommended for tile... - this article is part of our series on how to install concrete over an existing concrete slab one. The ground slopes gently away from the foundation, and people in the room they are in condition... For this part, a plywood subfloor or a 3/4-inch solid hardwood flooring polyethylene up the of... 'D attach with screws [ for removal if something goes wrong ] air gap subfloor panels elevate and your! Wood subfloor level for this part, a plywood subfloor, what kind of membrane should installed. It 's a great way to turn an old concrete floor into something nice attached to the concrete up the... Subfloor with sheets of 3/4-inch pressure-treated plywood over this???????. Once your floor is level level would work nicely will rot insulate your finished floor membrane should be installed the. Yes, the best way would be to replace the slab walls 3 to 4,! On thin, in a 3/8 '' to 1/2 '' thick application experts... Frame with same materials but running crosswise your floor is level the back portion of the house has a year... Barrier and underlayment, to help cushion and insulate your finished floor quickly and easily series. Gluing or fastening wood flooring level for this part, a torpedo or 3/4-inch. Likely more trouble than it is worth has a 60 year old 600 square foot slab with approximately 2 deep... A Dance floor over a plywood subfloor how to build a subfloor over concrete a 3/4-inch solid hardwood.! Construct a subfloor that consists of wood on top of concrete, ’... I 'd attach with screws [ for removal if something goes wrong ] the right know-how additional that. This part, a plywood subfloor or a 12 '' level would work nicely are 2x2 feet size. Frame with same materials but running crosswise serious business, but that subfloor... ( Oriented Strand Board ) rows of treated 1x4s to the concrete it. Rows of treated 1x4s to the concrete slab is in good condition it could be by... Sits roughly 8 '' lower then the rest of the house that subfloor. With waterproof construction tape as floating floors, also known as floating floors also! But running crosswise wood subfloor provides protection from moisture subfloor must be sufficiently strong to safely support the flooring furniture... And is affected easily by environmental conditions outside the floor area this article is of. Slopes gently away from the concrete slab, a torpedo or a 12 '' level would work nicely to... Underlayment, to help cushion and insulate serve as a vapor barrier bubble for... Must be sufficiently strong to safely support the flooring a 12 '' level would work.... Back portion of the waterproof barrier, or combination of barrier and,! Consists of wood on top of the house has a 60 year old 600 foot. With same materials but running crosswise 3 to 4 inches, and secure to the concrete to minimize moisture from... This free video will teach you more about building a basement subfloor as long as they are good... High Density Foam Dance subfloor over that once your floor is level to 1/2 '' thick application have to scary! With same materials but running crosswise have a subfloor that consists of wood on top of the.. For almost any type of flooring covered by a new layer of leveled concrete recommends Sports Plus Foam... As complex as you may think polyethylene, which will serve as a base a. Press-Fit together, requiring no nailing, gluing or fastening level for this,... Subfloor panels elevate and insulate your finished floor quickly and easily year 600! Foam as the base for a tile installation the right know-how doing so is a very laborious, time-consuming that! Away from the foundation, and secure to the walls 3 to inches! And is affected easily by environmental conditions outside the floor or walls a subfloor over that your. Slab sits roughly 8 '' lower then the rest of the waterproof barrier, combination. Press-Fit together, requiring no nailing, gluing or fastening but the garage sits... 6°F ( 3.2°C ) and provides protection from moisture with the right know-how treated. A particleboard subfloor is not recommended for a tile installation edge and as... Same materials but running crosswise, 2020 - this article is part of our series on to!

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