If you are installing vinyl planks over a concrete subfloor, you first need to level or sand any deformities. The words "subfloor" and "underlayment" are often used interchangeably, but they are two separate components. Since It can't move either, it just sits on the first one. Local and national codes contain specific requirements for framed floors and you should consult your local building department before beginning this project. Alternatively, screw rows of treated 1x4s to the concrete 16 in. They can correct uneven floors, repair damaged concrete, and provide a smooth and durable new surface for decorative treatments. 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. Installing Tile Directly on Concrete . An underlayment is a material that is sometimes installed over the subfloor and under the finished flooring. Hello I'm planning a new shed/summerhouse for my garden. 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. its very uneven and slopes toward one corner of the basement.. Do a floating suspended floor. A subfloor is part of the frame of the structure. There is about 150 sq ft off to the side (L-shaped basement) that is very uneven. Some laminates are glued down, while others float over the subflooring without the use of adhesive. There are a few ways to level a subfloor depending upon the type of material and the severity of the problem. 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. Subfloor. Also, you should check for subfloor deformities with a level or straight pipe. home improvement I'm about to be reno'ing my basement and i absolutely need to do something about the floor. May 23, 2020 - This article is part of our series on How to Install Hardwood Floors. To flatten or level an uneven or bumpy concrete or wooden subfloor, a thin concrete mixture known as self-leveling compound or self-leveling concrete is poured in the area. So, by using some self-leveling compound, you’ll need to even the subfloor first. The moisture content of the subfloor is critical. What you need to fix an uneven subfloor: Liquid primer – treat floors first before putting down compound; Self-leveling compound; 2”x4” Instructions 1. It lays directly on top of the waterproof barrier, or combination of barrier and underlayment, to help cushion and insulate. First, put down 6 mil plastic. Glued or nailed? Several companies make subfloor panels that sit on top of your concrete floor. It means you have to sand down high spots in the concrete or fill in low spots with a self-leveling compound. I'm a first time home owner, inexperienced with these types of jobs, and just trying to figure out the best way to approach this. These compounds are safe to use for installing hardwood floors on concrete subfloor too as long as its strong enough to support the weight. So the concrete floor sucks heat out of the room, making it uncomfortable. Add Supports. This type of subfloor is very common, but has a … While the perimeter is level, the concrete slab is uneven, hence the 1/2″-1″ inch variance. A tile or snap-in floor would run about the same material-wise but labor costs would be different. Here’s how to fix a few common types of subfloors: For plywood and OSB (oriented strand board) over joists: First, make sure that the joists are even and not the cause of the problem. As with a floated subfloor, NWFA recommends a vapor retarder for glue-down subfloors when installing ¾” wood flooring over concrete. Before cleaning concrete, you must know what type of laminate flooring you are installing. Check your flooring manufacturer’s recommendations to ensure you’re using a proper subfloor. A new layer of 5/8-inch or 3/4-inch tongue-and-groove plywood subflooring is like adding a new subfloor over the old to create a stiffer, flatter surface for any type of finished flooring. 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 procedure for installing a floor structure over a slab with 2 by 6 joists can be adapted to larger joist sizes if more subfloor space is required. Construct a subfloor with sheets of 3/4-inch pressure-treated plywood over the moisture barrier. This you can insulate with standard R-19 fibreglass, moisture barrier up. 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