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. Measure and mark the center of all four walls at floor level. The basement is very dry. Regular or treated plywood? Putting plastic down before pouring concrete, is to prevent any water in the concrete from being absorbed by the underlying soil. Materials minimum: 5/8 (19/32, 15.1mm) CD Exposure 1 plywood subfloor panels (CDX), 4’ x 8’ sheets. Use a minimum of two layers 3/8” (10 mm) CD Exposure 1 Plywood subfloor panels (CDX) in 4’ x 8’ sheets. Temperature control. The plastic membrane is sold in rolls, which the installer unrolls and cuts to fit the room. Typical sight lines run parallel to the longest wall, but each home is different. It's plastic and provides complete waterproofing, making it a good underlayment for a concrete slab or a concrete floor in a wet location. • Unlike 2’ x 2’ panels, there are no open seams that could create mold. Install a vapor barrier of plastic sheeting before laying the subfloor. (For more on concrete subfloors, see "How to Get a Concrete Subfloor Ready for Wood Floors" in the February/March 2003 issue.) I’ve watched endless YouTube videos and can’t really get a feel for whether I put subfloor down and then mark walls, or put walls down and then fill in the spaces with sub floor. It's cheating. How to Build a Wooden Subfloor on a Preexisting Concrete Slab ... Use plywood sheets to build a wooden subfloor over a concrete slab. Subfloor plywood is considered the more traditional method of subflooring. Intended to be used in residential basements, this tile subfloor protects wood planks or other engineered flooring from potential moisture damage. This may be made of various materials including polyethylene, plastic, or styrofoam. Even an inch or two in elevation for your subfloor will make a noticeable difference. The presenter is using 6 mil thick poly barrier. The theory is if there is any moisture in the slab, it will show on the underside of the plastic sheet; however, this is not always true. 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. A floating subfloor is less labor intensive, doesn’t rely on expensive adhesives, and can be integrated with a vapor retarder more seamlessly than other subfloor assemblies. Test the floor for moisture. The perimeter of the subfloor is then secured to concrete with Tapcon screws 24 inches on center. What is the best way to install a plywood subfloor over concrete slab? Concrete floors typically have moisture within them or have moisture that can transfer through the concrete from the soil below the slab. Place the first layer with edges parallel to the longest starting wall. • DELTA®-FL will never rot, unlike other subfloor systems. A floating subfloor is flooring that actually never touches cement underneath. Wood panels, such as plywood or oriented strand board, are common subfloor choices. Plastic nets are produced in rolls of up to 60 m and a width of up to four meters, the mesh with a density of 120 g / m2 and a mesh size of 45x45 mm is best suited for reinforcement. It "floats" or rests on top of a waterproof underlayment instead. Plastic subfloor systems. When rolling out the moisture barrier you want to go from wall to wall and cover the entire floor. 3 1. While this is still a perfectly acceptable route, a newer and easier solution is the subfloor system. Concrete Subfloor. Can be ribbed or quartz coated - for better adhesion to concrete. Installation method. Fibers are interlaced. The real genius of modern basement subfloor systems isn’t the OSB that many subfloor tiles are made from, but the dimpled plastic layer that separates and raises these tiles from the concrete floor. Full 8-foot tall basement ceilings in older homes are rare, with 7-footers more the norm. We installed wood look vinyl plank over concrete floors in our basement- here’s what I’ve learned from doing it a couple times and tips for installing your own! The lengths of membrane are joined with “Roof & Gutter” caulk. This may be as simple as a 6 mil polyethylene plastic covering 100 percent of the concrete and brought up all walls, then trimmed after the floor has been installed. Remember: if you’re working with a concrete subfloor, you should always test for moisture prior to installing your new floor. A subfloor will help insulate against a concrete floor that becomes overly cold in winter. DELTA®-FL is a uniquely dimpled, heavy-duty grey plastic membrane that keeps you … I don't think it is a good idea to install raw plywood directly over a slab if avoidable. DRICORE ® Subfloor is a simple do-it-yourself solution to help you create a warm, dry, comfortable basement that is fast and easy to install. And as it turns out, you don’t need to buy subfloor tiles to get this dimpled layer. Make sure that you scrub the subfloor well and it is already debris and dust-free because it needs to be clean before laying the moisture barrier underneath the laminate floor. For a concrete subfloor, you should install the plank with the sight lines of the floor. Subfloor systems translate the basics of the homemade subfloor into smaller tiles that are dry and insulated, faster to lay down, and require less construction know-how. This can come from cracks, shrinkage around the perimeter, or perimeter walls that have signs of weeping or leaks. These have a plastic base layer topped with OSB, which provides a surface for nailing or gluing down flooring as applicable. Once the concrete is poured over the top of the plastic, it seems like an ordinary floor — only it has amazing insulation. If you install new flooring without a subfloor, the moisture can be absorbed directly into your new flooring. ASTM's cement and concrete standards are instrumental in the evaluation and testing of concrete, cement, and aggregates. The material has dimples that form an air gap between the finished floor and concrete. Always install a class-I vapor retarder Wood-floor manufacturers recommend that concrete slabs be tested for moisture content before their products are installed. However, because wood is a naturally porous substance that will absorb moisture, when used as a basement subfloor, these materials are often installed on mini-joists known as "sleepers," which allow it to sit above a concrete pad. The synthetic base separates the floor from concrete dampness (not floods or heavy water), and the OSB top creates a flat subfloor that can be nailed into or simply covered with a variety of flooring materials. This method allows you to create your own subfloor using cheap wood materials. Source(s): 6yrs as a concrete contractor. The installer pre-cuts 5/8-inch T&G boards to fit the room, staggering the joints every 4 feet. Its biggest advantage is the fact that it separates the floor tile from the subfloor so any movements or cracking in the subfloor won't crack the tiles or grout. Try cutting a 12-inch-by-12-inch sheet of polyethylene plastic and taping it to the slab. Thermal properties of underlayment can help keep your floor warm. and it feels so good, you guys! For optimal moisture control you will want to overlap the poly barrier by at least six inches. Concrete is a porous material and can retain moisture and emit moisture vapor, which could end up in the wood floor above unless the proper precautions are taken. Home>>Project Case>> plastic grid subfloor for concrete . Apply a layer of six mil thick polyethylene plastic over the entire concrete slab to Build a grid work of 2-inch by 4-inch boards inside the perimeter boundary, with the... DRIcore 7/8 in. We’re making progress on my office makeover (see the plans here!) 7 years ago. If necessary, place sleepers (mini-joists) to raise the subfloor above a very damp concrete slab. Plastic for vapor barrier between plywood and slab? Both products use high-density polyethylene (HDPE), a very durable plastic, to form a water vapor barrier. This air-gap membrane is made up of a special high-density polyethylene resin (FDA approved), providing a dimpled surface with outstanding compressive strength, impact resistance and long-term performance. Waterproof sealer will also help keep out moisture. Snap the chalk line over the top of the concrete or moisture barrier between the marks on opposite walls making a cross in the center of the room. Height: Yes, you can build a 12-inch high basement subfloor and stay dry above everything, but basement ceilings tend to be low. The traditional solution is to build your own subfloor from scratch, layer by layer, from plywood, plastic, and wood sleepers. Concrete subfloor isn’t usually warm and can make your feet nice and cold. I’m about to turn my basement with high ceilings into some finished storage space. Concrete tends to wick water quickly, and the barrier holds back most of the moisture. If the water were to be absorbed by the soil, the process of the concrete 'curing' properly would be affected. • Provides an insulation thermal air-gap barrier that separates your finished floor from the concrete floor. Resource . The perfect plastic subfloor system for concrete and slab on grade floors. Concrete floor video on how to install concrete over an existing wood subfloor. Also, if the subfloor is concrete, you have to cover the concrete floors with a moisture barrier to prohibit moisture from flowing up and reaching the laminate. CONCRETE SUBFLOORS WITH PLYWOOD Always add a vapor retarder (min 6 mil plastic) before applying plywood underlayment to the concrete slab. Fiberglass has a diameter of 4-14 mm, is made in the form of webs or rods. DRICORE ® Subfloor is designed with a high density plastic membrane containing a patented air gap pattern to ensure moisture emitted from concrete floors can naturally evaporate. Glued or nailed? • Provides a strong even subfloor. Leave the vinyl in place for 72 hours. The barrier comes in rolls about twenty-four inches wide. We offer both the CertainTeed Platon Plastic Concrete Subfloor and the Dorken DELTA®-FL subflooring system at a lower price than you'll find elsewhere. 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. Tape a 3-foot-square piece of scrap vinyl to the concrete with duct tape, sealing the edges tight. LM from Hot Springs, AR. Manufactured in the USA, the Basement Subfloor Tile is designed to create a floating underlayment base providing a barrier separating the concrete and the finished floor. If moisture is present on the sheet, then there is definitely a moisture problem. With this method, a square piece of plastic is taped onto the concrete slab for at least 16 hours. This video describes the process of installing a moisture barrier over a concrete subfloor. The thermal properties are all considered by the material the underlayment is made up of. 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