Allow the primer to dry according to the manufacturer's instructions. Be sure you have the right amount of material after learning how to prepare a subfloor for tile. Mix the Skim Coat. Pour the mixture onto each of the areas you marked as being uneven. If you have only a few uneven spots, you can treat just those areas. Do not attempt to spread the quick-set mortar more thinly than recommended to shorten drying time. Roll on a layer of latex primer/sealer. Use a drill with a clutch to speed up driving the backer board screws. When you’re ready to determine how much tile you need, don’t guesstimate, calculate. Fill seams in the subfloor with caulk. Then, place a dehumidifier at high settings to pull out any moisture that is still in the air… Need Help? Prepare a Wood Subfloor for Tile As with a wooden subfloor, a concrete subfloor must be level for successful tile installation. Scoop the drill around the insides of the tub to make sure you've incorporated all the dry compound. Install a cement-based backer board following the manufacturer’s instructions. I do not remember if we put down cement board before the tile … I have a few fans pointed at the bottom plate. Pour the compound into a large mixing tub. Use 16d common nails to create a gap of 1/8-inch between the sheets. I'll let things dry first. After all backer board sheets are in position, remove the 16d common nails. It ensures that the subfloor is stable and won’t move under the tiles. Smooth concrete slabs must be etched or roughed up using chemical or mechanical methods to achieve a good bond. Measure the width of each doorway into the room. Tape off any affected vents with painter’s tape. Fasten them to the base of each doorway with drywall screws to ensure none of the leveling compound mars the doorway. Skim coat is a Portland cement-based product that fills in seams and other depressions on most subfloors. Contractors use pourable self-leveling compounds to smooth uneven floors before tiling them. Wear safety glasses. The subfloor then must be cut out and removed so you can examine the framing and let everything dry out. Apply painter's tape to the bottom of each two-by-four, where it meets the subfloor, to cover the seam between them. If the moisture has damaged any joists or wall studs or plates, or if the wetness goes under a wall, … Use a large bucket and a drill with a mixing paddle. If you’ve made any adjustments to your floor, you must allow them to completely dry before installing the new floor. Cut and score along your line with a carbide backer board cutter and a straight edge. The subfloor must be able to hold the weight of the tile and preparation materials required to complete the installation. Insert a power drill with a mixing attachment into the tub. Clean the bucket, drill and mixing attachment immediately. This provides a solid surface under the tile that prevents flexing that could lead to cracking. Test by sprinkling water on various areas of the subfloor. Expect to use 54 to 60 screws per sheet of backer board. Your concrete floor should be clean, dry, flat and free of adhesives. If water penetrates and leaves a wet spot, then a good bond can be achieved. A self-leveling compound can be poured over the entire surface if the subfloor has several high and low spots. The polymer-modified thin-set provides additional strength and helps eliminate any movement between the backer board and the subfloor. Cover the subfloor in a latex primer suitable for the subfloor's material. ", Step 2: Apply the primer evenly with a roller brush. Other common types include cementboard or tile backer (used under ceramic or stone tile), foam underlayment (used under laminate and engineered wood "floating" floors), and rosin paper (used under solid hardwood flooring). Cover the subfloor in a latex primer suitable for the subfloor's material. Mix a small batch of the skim coat according to directions on … If you use non-adhesive tape, you’ll want to first fill the gaps with mortar before setting the tape in the mortar. After removing it all, we used self leveling compound to get everything flat and had tile put down. Fill seams in the subfloor with caulk. Check for dips in the floor by sliding a 4-foot to 6-foot straight edge in different directions all around the room. Thoroughly clean your subfloor. Use of this site is subject to certain Terms Of Use. Level Concrete Subfloor and Install Crack Prevention The Home Mender, Dustin Luby, shows us how to repair that unsightly rot hole in your floor to prepare it for a new. If you find hollows and valleys, you must fill them with a self-leveling underlayment. She graduated from Syracuse University in 2007 with a Bachelor of Fine Arts in musical theater. Now if this is just a small area of the floor, it may be possible to remove the tiles without damaging them, cut out and replace the rotten subfloor, and then replace the tiles … WEAR SAFETY GLOVES. Start by sweeping up any debris. Press down with your hand and knee on the edge of one side of the line and lift the opposite edge to snap the panel. Wear a dust mask or respirator while mixing or applying self-leveling compound. As you can see from the photo, they use a commercial dehumidifier to dry out the main level of the residence, drill a 4” hole in the subfloor and blow the heated dry … Mark the first tile location. Chad placed a pressure-treated 2×6 scab along one of the damaged floor joists to add strength and to … Allow the thin-set to dry before proceeding, usually a day. Then reinforce the joints with self-adhesive alkaline-resistant glass fiber tape specially made for backer board. More often than not, water will drip under a loose section of linoleum or vinyl. A shop vac helps to clean out sawdust and other debris in the area under the subfloor. Comb the mortar with the notched edge of the trowel at a 45-degree angle to the floor, taking care to make sure the trowel lines go in the same direction. Prepare a Concrete Subfloor for Tile Home Mender. Attach Backerboard to Wood Subfloor Agreed- definitely not ideal, but it was something I had to do. Mix the leveler in a bucket according to the manufacturer’s instructions. Once the tile has set, apply grout to the joints between the tile, wiping off any excess with a damp sponge. Leave a 1/4-inch gap between the edges of the backer board and the walls to allow for subfloor expansion and contraction. Oriented strand board (OSB) and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backer board. Right now it's reading over 70% moisture so it's soaked. In other words, be sure that no four corners of the backer board touch. Read the product's safety information to determine the specific safety measures to take. Particleboard is not an acceptable subfloor material for tiling projects. It must not be subject to hydrostatic pressure or moisture penetrating the slab from below. ", Step 4: All Rights Reserved. It supports your decorative floor finish, whether it’s carpet, hardwood, vinyl, laminate or tile. You can also use a wet/dry vacuum for a deep cleaning. If the vinyl is glued, you have two options. Wear rubber gloves and safety glasses. Stephanie Mitchell is a professional writer who has authored websites and articles for real estate agents, self-help coaches and casting directors. Another TCNA method (F147) uses a min. It also provides a surface that grout can adhere to, giving the tile layer additional stability. CIM’s “ Waterproofing Under Tile ” guide offers an outline for keeping surfaces dry … You can either roll on a liquid latex membrane or use a peel-and-stick crack prevention mat over the entire concrete subfloor. If the subfloor is unsteady when you walk on it or seems unsound, reinforce it before leveling it. What can I use to fill in a hole in our bathroom floor before putting vinyl tile over it? Mix the compound until it is runny. The sub-floor is still under … A subfloor is the bottom-most structural level of your floor. © 2000-2020 Home Depot Product Authority, LLC. Concrete subfloors move, shift and crack over time. Place the first sheet of backer board on the mortar. Allow the compound to dry for the length of time specified by the manufacturer before you walk on the floor or tile it. Backer board panels typically measure 3-feet by 5-feet and can be trimmed as needed. How to Remove Peeling Paint Without Hurting Drywall, How to Lay Concrete on Top of an Old Concrete Garage, Home Addition Plus: Self-Leveling Compounds, Floor Covering Installer: The Key to Successful Self-Leveling: Preparing the Substrate, How to Level a Floor With a New Substrate Before Installing New Tile. To allow the sub floor to thoroughly dry… Tape off any affected vents with painter’s tape. A successful tile installation project requires a level surface. Use a polymer-modified thin-set – a type of mortar – to attach the backer board to the subfloor. It will seek its own level, and once dry will create a flat and even surface. DryBarrier® is a modular subfloor tile system made from thermoplastic elastomer and is used on concrete as a subfloor for below grade, slab on grade, and suspended slab construction. Also, if your subfloor runs east to west, lay your backer boards in the opposite direction, north to south. Vacuum the subfloor with a wet-dry vacuum to remove any dust and debris. Know exactly how much you need with our tile calculator. Every hump and dip in the subfloor will compromise the integrity of your tile job and eventually cause the tile to crack. Add water to the compound according to the manufacturer's instructions. Apply the primer evenly with a roller brush. ". There are also engineered subfloor … That’s why having an adequately prepared subfloor is so essential. What is a Subfloor? Before you can lay a tile floor, you must make sure the subfloor is entirely flat. Clean the mixing paddle promptly so the mortar does not harden on it. Use 1 5/8-inch screws for 1/2-inch backer board. When laying tile onto backer board, wet the backer board using a spray bottle filled with water before spreading the thin-set. Setting tile on cement backer board with spacers used to align the tile. Use 1 1/4-inch screws for 1/4-inch backerboard. Remove the tiles over the damaged area of the subfloor. Subfloor systems can be a challenge to dry out. Waterproofing Under Tiles Can Protect a Structure’s Foundation from Moisture-related Damage. If water beads, surface contaminants are present and loss of bonding may occur. There's no way you're going to be able to remove the subflooring from under the tile without disturbing it. If there are cracks larger than 1/8-inch in your concrete subfloor, those should be patched and filled with a cement patching compound. Just make sure your floor dries completely before moving to the next step. Finally, lay out the location for the tile, apply a coat of thin-set to the backer board, and lay the tile. Warmer weather all next week so hopefully it will dry in a week or two. Saw a two-by-four to each of these lengths. The tiles … Roll on a layer of latex primer/sealer. The tile will not adhere well. 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