Smooth concrete slabs must be etched or roughed up using chemical or mechanical methods to achieve a good bond. A subfloor is the bottom-most structural level of your floor. The subfloor under the tile should be at least 1 1/8â³ thick, with a minimum of 5/8â³ thick exterior grade plywood topped by 1/2â³ cement backer board. Cement and wood layers. Second, the strength of wood boards isn't always consistent. Particleboard is not an acceptable subfloor material for tiling projects. If youâve made any adjustments to your floor, you must allow them to completely dry before installing the new floor. Tile over tile is not recommended on a floor below grade. Wiggle the tile back and forth a bit to allow the ridges in the thinset to break down and fill in the valleys. How to Prepare a Subfloor for Vinyl Flooring. ". (0.38m), the maximum allowable variation is no more than ¼ in. Click to learn more about how to prepare your wood subfloor or your cement subfloor. The polymer-modified thin-set provides additional strength and helps eliminate any movement between the backer board and the subfloor. To prepare a concrete subfloor for installing tile, youâll need to do a different kind of preparation. Preparing a subfloor is an essential step for installing floor tile. Instead of cement backboard, should I use ½ inch plywood to provide extra support for the tiles? Planning and patience along with these tips will help ensure that you install the quality of â¦ Contaminants should be removed before installation. Oriented strand board (OSB) and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backer board. Additionally, a steps must be taken to ensure that a concrete floor will create a solid bond. To keep them lasting for generations to come, you must start by meeting all of the subfloor requirements. Concrete subfloors are prepared differently than wood subfloors. Step 2 Purchase enough cement backerboard to make your floor at least 1-1/4-inch thick; this usually requires just one layer. OSB panels provide an excellent base for many types of finished flooring including ceramic tiles if careful attention to the construction and preparation of the subfloor is paid in order to avoid costly callbacks. This is not to say that tile cannot be installed reliably over an OSB subfloor; however, there is significant debate in the tile industry regarding the conditions necessary for a long-lasting successful installation. For more information, download our PDF about types of subfloors. Image Credit: Natalia â¦ Know exactly how much you need with our tile calculator. plywood subfloor with 16" (406 mm) o.c. Please call us at: 1-800-HOME-DEPOT (1-800-466-3337), Please enter in your email address in the following format: firstname.lastname@example.org. To prepare your concrete subfloor, make sure that it can accept water penetration. Sustainable Ceramic Tiles, Glass Tiles, and Tile Installation Materials. The anchoring fleece is embedded in thin-set mortar to provide a mechanical bond to the substrate. No matter how firm the subfloor; the plywood will expand and contract at a different rate as the tile, causing cracks to develop in the grout lines or tiles over time. The above types of marble â¦ A new concrete floor should be allowed to cure for three to four months before installing flooring, and any moisture problems and leaks will need to be addressed before installation can proceed. Concrete subfloors should have a coarse finish to form the bond with the thin-set. Subflooring Requirements for Tile Floors To meet TCA stiffness requirements, floor framing should be no more than 16 inches on-center with minimum 19/32 -inch plywood subflooring. Tape off any affected vents with painterâs tape. Adding a layer of conventional backer board will add to the deflection problems--not remove them. Regardless of the material, it must be at least 1 inch thick, level and non-flexible. Follow the directions on the packaging to properly mix the thin-set mortar. joist spacing Limitations minimum 2" x 2" (50 mm x 50 mm) tile for natural stone, see detail D-W-S (page 6) and natural stone discussion (page 24) Requirements maximum spacing of joists, I-joists, or floor trusses is 16" (406 mm) o.c. Use a drill with a clutch to speed up driving the backer board screws. Use 1 1/4-inch screws for 1/4-inch backerboard. You can either roll on a liquid latex membrane or use a peel-and-stick crack prevention mat over the entire concrete subfloor. To prevent that movement from creating cracks in your grout and tile, install a crack prevention membrane after the concrete subfloor is clean, flat and free of cracks larger than 1/8-inch. Wear rubber gloves and safety glasses. Expect to use 54 to 60 screws per sheet of backer board. Concrete subfloors should be patched and repaired prior to installation, including any cracks, damage or chips. Hereâs the basic rundown of how to use DITRA for ceramic or porcelain tile: 16 inch on-center joist spacing with single layer OSB or plywood subfloor 19.2 inch on â¦ Therefore, youâll need a subfloor thatâs built up to withstand the weight of these tiles. Tile floors are heavy and tile is a hard material. Need Help? The subfloor is 23/32 T&G OSB, with ¼ inch lauan and sheet vinyl over top. Leave a 1/4-inch gap between the edges of the backer board and the walls to allow for subfloor expansion and contraction. 2 Prepare a Wood Subfloor for Tile #3, with one exception, all tile backer boards are non-structural. Tile installed over wood floor systems MUST have a minimum of 1-1/4 inches of solid material beneath it. Porcelain, Ceramic, and Glass tile only need one layer of EGP plywood or OSB, minimum 5/8" (16" joist spacing) or 3/4" (>16" joist spacing). Preparation for installing floor tile depends on the type of subfloor in the room you are tiling. 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 Tile is installed over DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the squarâ¦ Sheet vinyl flooring provides a durable surface for high-traffic areas in your home. Mix the leveler in a bucket according to the manufacturerâs instructions. #2, get deflection specs from stone tile dealer. If there are cracks larger than 1/8-inch in your concrete subfloor, those should be patched and filled with a cement patching compound. It provides a level surface that will allow the tiles to properly stay in place. Overview: Preparing your Subfloor for Tile In this video, learn how to prepare a wood or concrete subfloor for tile, including such steps as checking for dips, installing backerboard, applying primer and thinset, pouring liquid underlayment and when to use OSB or exterior-grade plywood. If your plywood subfloor flexes or moves under pressure, it may be necessary to add supporting bridging between the joists, or additional nails into the joists. Underlayment is the material placed on top of the subfloor that assists in the installation of the tile or other type of flooring. When youâre ready to determine how much tile you need, donât guesstimate, calculate. This guide will show you how to prepare your subfloor for a tile installation project to ensure that itâs fit to support ceramic or porcelain tile. Most commonly, the maximum moisture condition is 3.0 pounds per 1,000 sq. Tip: Make sure the subfloor will not deteriorate when it gets wet. Use a polymer-modified thin-set â a type of mortar â to attach the backer board to the subfloor. before the year 2010, the tile A single layer of tile allows any moisture in the concrete to escape through tile joints. With a trowel, scoop out and spread enough mortar on the wood subfloor to cover an area slightly larger than your first piece of backer board. To determine the requirements for a tile subfloor, I partnered with Jim and Rich from Diamond Tile located here in Maryland. Every screw head should be flush with the panel. in 1 ft. (1.6 mm in 0.3 m) from the required plane, when measured from â¦ Cover the tape with thin-set mortar and level it with a straight edge. Upgrading to 23/32- inch plywood will stiffen the subfloor by almost 80% and provide a more solid feeling floor. Most floor tile is adhered to the subfloor or underlayment with cement-based thinset mortar. The subflooring should be level â¦ Re: Subfloor under marble tile #1, the TCNA Handbook is a guide for installing ceramic tile-not stone tiles. Fill seams in the subfloor with caulk. Some backer board manufactures have identified the locations on the backer board where the screws need to be placed. After you do this with your first tile, lift it back up, and check to ensure there is 80â90% thinset coverage on the back of the tile. The subfloor must be able to hold the weight of the tile and preparation materials required to complete the installation. Your best bet is a subfloor thatâs made of both cement and wood layers. Continue this process to lay the rest of your backer board panels, leaving a 1/4-inch gap at the walls. Follow the manufacturerâs instructions, but this usually takes several days. Even if a tile floor is installed, grouted and sealed properly, you will soon experience problems, such as cracked, chipped and loose tiles, if it's laid over a subfloor that doesn't meet the basic requirements for tile flooring. While you can lay tile directly over a concrete slab using thin-set adhesive, donât make the mistake of applying tile directly to a plywood subfloor. Check the package for specific drying times. This achieves a solid layer of thinset beneath the tile. Your concrete floor should be clean, dry, flat and free of adhesives. minimum subfloor thickness â 19/32", 5/8" The difficulty is that tile can be installed over a number of substrates, and each requires specific preparations to ensure a long-lasting tile floor. Depending upon the manufacturer, you may need to score both sides of the board. Then reinforce the joints with self-adhesive alkaline-resistant glass fiber tape specially made for backer board. Check for dips by sliding a 4- to 6-foot straight edge in different directions all around the room. Today, for tiles with all edges shorter than 15 in. enhAnCed definiTionS foR lARge foRmAT Tile And SuBSuRfACe flATneSS RequiRemenTS the American National Standards Institute (ANSI) Specification for the Installation of Ceramic tile stipulates that deviations in sub-floor flatness should be no greater than 1/4" in 10' (ref. ", Step 2: If water beads, surface contaminants are present and loss of bonding may occur. © 2000-2020 Home Depot Product Authority, LLC. Roll on a layer of latex primer/sealer. Place the first sheet of backer board on the mortar. It will seek its own level, and once dry will create a flat and even surface. If water penetrates and leaves a wet spot, then a good bond can be achieved. What is a Subfloor? Be sure you have the right amount of material after learning how to prepare a subfloor for tile.
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