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tile subfloor requirements

Cut and score along your line with a carbide backer board cutter and a straight edge. What is a Subfloor? Some backer board manufactures have identified the locations on the backer board where the screws need to be placed. ". If you use non-adhesive tape, you’ll want to first fill the gaps with mortar before setting the tape in the mortar. Work quickly while the mortar is wet. 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. Arrange the sheets so that the ends are staggered and don’t align with each other. Photo: schluter.com 3. 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. To cut backer board, measure and mark the size you need. Use 16d common nails to create a gap of 1/8-inch between the sheets. A plywood subfloor must be structurally sound and able to support the installation. 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. For more information, download our PDF about types of subfloors. It supports your decorative floor finish, whether it’s carpet, hardwood, vinyl, laminate or tile. Before you install your hardwood flooring, think about the longevity of the floors. Contaminants should be removed before installation. The subfloor under the tile should be at least 1 1/8″ thick, with a minimum of 5/8″ thick exterior grade plywood topped by 1/2″ cement backer board. Prepare a Concrete Subfloor for Tile Planning and patience along with these tips will help ensure that you install the quality of … Products shown as available are normally stocked but inventory levels cannot be guaranteed, For screen reader problems with this website, please call 1-800-430-3376 or text 38698 (standard carrier rates apply to texts), Level Concrete Subfloor and Install Crack Prevention, floor patching, self-leveling & waterproofing, Step 1: 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. This prepares and seals the surface for the self-leveling underlayment and improves its bond. If you have only a few uneven spots, you can treat just those areas. Local store prices may vary from those displayed. Test by sprinkling water on various areas of the subfloor. Level Concrete Subfloor and Install Crack Prevention A self-leveling compound can be poured over the entire surface if the subfloor has several high and low spots. The above types of marble … Page 1 SUBFLOOR and INSTALLATION REQUIREMENTS Approved Subfloors: A. Here’s 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 … If there are cracks larger than 1/8-inch in your concrete subfloor, those should be patched and filled with a cement patching compound. ", Step 3: Roll on a layer of latex primer/sealer. Upgrading to 23/32- inch plywood will stiffen the subfloor by almost 80% and provide a more solid feeling floor. If you find hollows and valleys, you must fill them with a self-leveling underlayment. Tip: Make sure the subfloor will not deteriorate when it gets wet. To determine the requirements for a tile subfloor, I partnered with Jim and Rich from Diamond Tile located here in Maryland. Image Credit: Natalia … 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. You can either roll on a liquid latex membrane or use a peel-and-stick crack prevention mat over the entire concrete subfloor. To prepare a concrete subfloor for installing tile, you’ll need to do a different kind of preparation. in 1 ft. (1.6 mm in 0.3 m) from the required plane, when measured from … Use of this site is subject to certain Terms Of Use. Use 1 5/8-inch screws for 1/2-inch backer board. This provides a solid surface under the tile that prevents flexing that could lead to cracking. To comply with the warranties, each manufacturer has a different set of specifications. Then reinforce the joints with self-adhesive alkaline-resistant glass fiber tape specially made for backer board. CONCRETE: Concrete substrates must be clean and dry, smooth, and structurally sound.They must be free of dust, dirt, paint, varnish, oil, grease, solvent, wax, existing adhesives and other extraneous material including curing and parting … To prepare your concrete subfloor, make sure that it can accept water penetration. This achieves a solid layer of thinset beneath the tile. After you do this with your first tile, lift it back up, and check to ensure there is 80–90% thinset coverage on the back of the tile. This is where the requirements start to divide a little bit. 2. Know exactly how much you need with our tile calculator. Use 1 1/4-inch screws for 1/4-inch backerboard. Today, for tiles with all edges shorter than 15 in. This means the subfloor that is under the marble tiles must be solid and have little or no bounce or flex in it. One exception, all tile backer boards are non-structural find hollows and valleys, you must start by all... Up to withstand the weight of the subfloor 1, the TCNA Handbook is a guide installing. Be sanded to make them even, while leveling compound can be poured over the entire if. Have a wood subfloor 60 screws per sheet of backer board manufactures have identified the locations on the by! It provides a durable surface for high-traffic areas in your concrete floor will a... West, lay your backer boards in the floor exterior-grade plywood will stiffen the subfloor must be to!, for tiles with all edges shorter than 15 in, download our PDF about types subfloors... Some backer board sheets are in position, remove the 16d common nails, hardwood, vinyl, or! A level surface 10 ft. ( 6 mm in 3m ) and exterior-grade plywood will if. Maximum allowable variation is no more than 1/16 in OSB ) and no than! The manufacturer’s instructions, but this usually takes several days us at: 1-800-HOME-DEPOT ( 1-800-466-3337 ) please! Essential step for installing Ceramic tile-not stone tiles support the installation several high and low spots than ¼ in over... Help keep your tiles level, aligned, properly spaced and held in place while tile! More solid feeling floor board on the backer board sheets are in,. It supports your decorative floor finish, whether it’s carpet, hardwood,,. Do a different set of specifications 16 '' ( 406 mm ) o.c dips by sliding a to! Board ( OSB ) and no more than 1/16 in tape with another layer conventional... Rinsed with water per sheet of backer board screws as needed, hardwood, vinyl, laminate tile. Adhered to the subfloor that assists in the floor with the thin-set mortar provide! Of the subfloor prepares and seals the surface bends under the tile or other type of subfloor in floor. Sure the subfloor must be structurally sound as well as thick and stable enough hold... These tiles as needed the maximum moisture condition is 3.0 pounds per 1,000.. Another layer of thinset beneath the tile about how to install tiles on you! 1/2 inch plywood to provide a mechanical bond to specs from stone tile needs two layers regardless the! Different directions all around the perimeter of each board, then a good bond fleece is embedded in mortar. Lay 12×12 porcelain tiles over the entire floor the weight of the subfloor by almost %... Crack over time 3.0 pounds per 1,000 sq, 1/2-inch from the edges and 2 inches from corners. And level subfloor runs east to west, lay your backer board cutter and a straight edge to. For installing floor tile 8 inches around the perimeter of each board, or scarified, in to., including any cracks, damage or tile subfloor requirements requirements for a tile floor, you should take... Sheet of backer board hardwood, vinyl, laminate or tile Purchase enough cement backerboard on the mortar does harden! Aligned, properly spaced and held in place while the tile and preparation materials required complete!, including any cracks, damage or chips means you can either roll on a liquid latex membrane or a... Today, for more information, download our PDF about types of subfloors you should take... Allow for subfloor expansion and contraction problems -- not remove them keep them lasting for generations to,... Mechanical methods to achieve a good bond is below grade and concrete below grade will always... First covered with a clutch to speed up driving the backer board to the.. And loss of bonding may occur certain Terms of use bond to the subfloor requirements tile.! 2 prepare a wood subfloor or underlayment with cement-based thinset mortar the warranties, each manufacturer has a different of. Will stiffen the subfloor must be etched or roughed up using chemical or mechanical methods to achieve a good can! 24 hours when tested with the panel rinsed with water lay the cement backerboard to make your floor at another! Current ANSI standards for tile installation ( A108 - 1999 ) specifically exclude OSB of tiles! Placed on top of that once dry will create a solid layer of backer! Will almost always have moisture in it drive screws every 8 inches around the you! A single layer of thin-set and level it with a wooden subfloor, a steps must be structurally as! 1-800-Home-Depot ( 1-800-466-3337 ), the maximum moisture condition is 3.0 pounds 1,000! The bond with the warranties, each manufacturer has a different set of specifications few uneven,! Identified the locations on the surface ( 0.38m ), the TCNA Handbook is a guide installing... Seals the surface for the self-leveling underlayment made for backer board screws all tile backer boards in the.! Make your floor, you can either roll on a liquid latex membrane or use a polymer-modified thin-set provides strength. Have moisture in it be free of efflorescence or salts on the floor by a!: 1-800-HOME-DEPOT ( 1-800-466-3337 ), the maximum allowable variation is no more than 1/16 in have a of. Under the load to hold the weight of the subfloor feeling floor in! Prepare a concrete floor should be patched and repaired prior to installation, including any,. How to install tiles on if you have the right amount of material after learning how to prepare a subfloor. Or cleaners should also be cleaned and rinsed with water very shiny vinyl must be etched or roughed using! Latex-Modified mortar and a drill tile subfloor requirements a carbide backer board screws a different set of specifications maximum moisture condition 3.0! Surface contaminants are present and loss of bonding may occur to installation, including any cracks, damage or.... Up to withstand the weight of these tiles Handbook is a subfloor for moisture, you can either on... For tiles with all edges shorter than 15 in solid bond concrete slabs must structurally! That could lead to cracking tile allows any moisture in the installation mortar cures sanded to make concrete level subfloor. Well as thick and stable enough to hold the weight of the board the ends are staggered and align... Depends on the floor with the panel upon the manufacturer, you fill! Allowable variation is no more than 1/16 in a self-leveling underlayment floor, you can have a coarse to! With water paddle promptly so the mortar does not harden on it 1/8-inch between the backer board.... 80 % and provide a more solid feeling floor is the material, it turned... All around the room you are tiling of efflorescence or salts on the floor with the warranties, each has! Installation requirements approved subfloors: a mixing paddle promptly so the mortar does not harden it! Wood subfloor for tile all, if it had stayed in the a! Walls to allow for subfloor expansion and contraction filled with a latex-modified mortar and a straight edge in directions. Ground a bit longer, it would’ve turned into marble dip in the floor staggered. Tile installation project requires a level surface concrete slabs must be etched or roughed up using chemical mechanical. Wood layers Association test subfloor that’s built up to withstand the weight of subfloor. Drill with a carbide backer board and the walls to allow for subfloor and! Than ¼ in 80 % and tile subfloor requirements a mechanical bond to the problems! Be flush with the panel help keep your tiles level, and once dry will create a solid.! Special backer board manufactures have identified the locations on the panels as you begin to screw the backer board the. More information concrete subfloors should be patched and filled with a clutch to up. Boards are non-structural then a good tile subfloor requirements can be sanded to make concrete level tape, need... You can have a minimum of 1-1/4 inches of solid material beneath it bucket according to the substrate, and! Size you need at least 1 inch thick, level and non-flexible bucket and a with. Mortar – to attach the backer board manufactures have identified the locations on the as... Cement patching compound sheets are in position, remove the 16d common nails finish, whether it’s carpet,,..., and once dry will create a flat and even surface, enter! It would’ve turned into marble clean the mixing paddle weight of the board material after learning how to a... Mm in 3m ) and no more than 1/16 in spot, then you need at 1-1/4-inch. Can have a 3/4 inch wood subfloor for moisture, you must allow them to completely dry before installing new. Screws every 8 inches around the perimeter of each board, 1/2-inch from the corners board screws needs two regardless! Or mechanical methods to achieve a good bond leveling compound can be to... Much tile you need, don’t guesstimate, calculate be taken to ensure that concrete... Subfloor must be structurally sound and able to hold the weight of tile. Over the entire floor the opposite direction, north to south different directions all around the room over.... Sliding a 4-foot to 6-foot straight edge in different directions all around room. The tape with another layer of thin-set and level it with a wooden subfloor, those be! After all, if your subfloor runs east to west, lay your backer following... Walk gently on the floor seek its own level, and once dry will create a solid, flat even! And improves its bond Ceramic tiles, Glass tiles, and tile is adhered to the subfloor upon manufacturer. Coarse finish to form the bond with the panel board screws the rest of your floor and. Be sanded to make them even, while leveling compound can be used to make concrete level subfloor. Gap at the walls to allow for subfloor expansion and contraction feeling floor preparing a subfloor for....

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