I noticed a few white lines in the marble a month or so after moving in and now those white lines are cracks. How to Tile Over Hardwood Flooring (article) Tiling Over a Tile Floor (article) The original subfloor is currently 5/8" plywood sitting on 2x8s, 16" OC. The first one to show up was at the doorway into the bathroom. See Water Sensitivity and Fiberglass Mesh Reinforced Stone in the Natural Stone Tile Selection and Installation Guide. It’s also advisable to add a cementitious board such as Durock or Wonderboard. verify that subfloor panels are properly fastened to framing members underlayment – minimum 11/32", 3/8" nom. I have a few spots where the subfloor is squishy. The second sure fire way to determine the thickness of your wood subfloor is to use a hole saw to …. Italian marble is a wonderful material that can quite simply enhance the beauty and elegance of any room. Hello, I'm planning on putting marble tile in my washroom, and would like to know what product to use under it. • Use white for light-colored marble, limestone, and other stones where staining or darkening from grey setting materials is possible. On marble tiles that are 12 inches square and smaller, a 1/4-inch notched trowel will create large enough grooves. Build and Tile Curbless Showers with Professional Results …. Too much thickness can cause doors to rub, and it can lead to an uneven transition between rooms. Most ceramic tiles have very little tensile strength. The most forgiving is 1” to 2” vitreous porcelain and the least in my experience is 18” Travertine marble. Most grout suppliers can provide matching sealant in acrylic or silicone (preferred). Underlayment butt joints should not come within 2" of subfloor joints, and should preferably be at the 1/4 points of the sheets beneath them. In this case, the guys usually install 1/2″ plywood overtop and 1/4″ CBU or DITRA. (This Picture is Contributed by "Ahmed") ; Italian Marble Flooring. These joints should be caulked with a high-quality sealant. As for adding to subfloor, it's hard to cover everything about tiling in a simple post. Thin set mortar can be spread directly on a plywood subfloor with a notched trowel. Log in. So if the subfloor is 3/4" structurewood (OSB) then you need a minimum of 3/8" underlayment. You have several options. Insulating A Cathedral Ceiling With Foam Board. This bounce will crack the tiles. Floor joists are basically wood I beams. Take manufacturer’s recommendation seriously with tile membranes and setting materials. Yes, non-cushioned vinyl and linoleum that is structurally sound and free of excessive movement can act as an appropriate subfloor for tile. I know that, at 5/8”, my subfloor is suitable for most types of cement boards but that it is THE bare minimum and I’ve read that the 5/8” minimum for most cement boards, when tested by manufacturers, are generally done on new materials with ideal conditions; two things that, due to the age of my floor sub floor, has got me reconsidering this approach. Most prefer a minimum thickness of at least 1-1/4 inch, such a … © 2020 BuildingAdvisor.com®; All rights reserved. No, cushioned vinyl is not an appropriate subfloor. M. Musivarius TF. The cracks go through numerous tiles and are random throughout the room. Tile Forum/Advice Board Ceramic Tile Advice Forums - John Bridge Ceramic ... minimum subfloor thickness – 19/32", 5/8" nom. SUPERSEAL Tile Subfloor can save you up to 70% as compared to wood subfloor or cement subfloor products SUPERSEAL Tile Subfloor is fast … Before you can lay marble tile, you need to install cement board. This story shows tiling an entryway, but you can use the same techniques in a bathroom or kitchen with equally dramatic results. Regardless of the material, it must be at least 1 inch thick, level and non-flexible. Some wood floor systems, when designed to minimum standards, have too much bounce. I recently had calcutta gold 16x16 marble tiles installed in my bathroom. … Or is that unnecessary since we're using 3/4"? Never grout tile joints that abut other materials, planes, or restraints such as : wood, fiberglass/acrylic, tile base, recesses, etc. The subfloor must be structurally sound as well as thick and stable enough to hold the weight of the tile without moving or flexing. Plywood subfloors can be sanded to make them even, while leveling compound can be used to make concrete level. Minimum seven days curing is recommended after stone slabs are fixed as inadequate curing leads to stone slab de-bonding from mortar. Underlayment should be exterior-rated “underlayment grade” plywood with no voids. The latter cracks if the floor flexes at all and there are too few grout joints to give it any flexibility. (10 mm-thick Exposure 1, plugged-face) plywood or OSB with 1/8(3 mm) gap " between sheets; see page 20 for underlayment installation guidelines any leveling of the assembly must be done prior to installing DITRA and DITRA-XL General Rule: Kährs requires that no board have a width less than 3” or .38” of a full board width. I'm not sure if I should put a 1/4" cement board (wonderboard), 1/2" densshield, detra, or schluder under the tile to keep it from cracking. How To Install Two-Ply Roof Underlayment? Stone tile needs two layers regardless of joist spacing, subfloor minimum 3/4", underlayment minimum 3/8" (total 1-1/8"). 2” from joints in underlayment. Whether your subfloor and joist system meets L/720 is best referenced by the manufacturer, I think. I know in my house, I have 3/4" T&G and it's only 5 years old. The bare minimum recommended by most tile setters is a total subfloor thickness of 1-1/8 inch. 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. Stick with one manufacturer for setting materials – thinset, grout, colorant, sealer. Joined Oct 8, 2008 Messages 332 Reactions 3 Location Bury St Edmunds, United Kingdom. If they install a second layer of wood underlayment (3/8″ plywood or thicker), the guys would use 1/4″ CBU on top. Marble Institute of America 30 Eden Alley, Suite 301 Columbus, Ohio 43215 614-228-6194 www.marble-institute.com Thin-Set Ceramic Tile 8 3" ceramic floor tile 4.7 psf ½" cementitious backer board 3.0 psf ¾" wood structural panel subfloor 2.3 psf BCI joists at 16" on center 2.5 psf ½" gypsum board ceiling 2.2 psf miscellaneous 2.3 psf Mix two products and no one is responsible if there are problems. © Copyright 2020 Hearst Communications, Inc. 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. For this reason, ceramic and porcelain tile floors can be considered somewhat delicate, despite the inherent strength of the material. Older homes may have a structural plank subfloor, and these can be problematic because they move so much with changes in humidity. The subfloor must be structurally sound as well as thick and stable enough to hold the weight of the tile without moving or flexing. Tip. Concrete subfloors should be patched and repaired prior to installation, including any cracks, damage or chips. Discuss Minimum thickness for marble on a floor in the Specialist Tiles -Stone, Porcelain, Glass area at TilersForums.com. The existing subfloor is 3/4" with a 1/4" pressboard over top. Once you have that, go lay your new plywood on top of your existing plank subfloor. You need an adequate underlayment for marble, as you do with any tile, whether it is stone, ceramic, or porcelain. I've only ever used 10 mm thick, I assume 4 mm would be too thin? I would like to make the tiles flush with the hardwood, there will be a 3/4" marble threshold separating the hardwood from the tile. The floor framing should be designed for max. Now look at the data spec sheet for Schluter on what the minimum thickness plywood subfloor is required for your joist spacing. 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. Further Information. Both t&g subflooring and underlayment should be gapped 1/8”. With the thickness of the subfloor, you need 1-1/8", to prevent deflection. I plan on laying down a 12"x12" porcelain tile, using Ditra for the underlayment. Trimming the bottom of a door casing with a jamb saw so the tile will fit under it. I have screwed ~6" into the joists to keep everything nice and tight. (16 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets Should we be using tongue-and-groove plywood? The generic statement that the tile and stone industry makes regarding deflection of the subfloor is that it must meet a minimum of L/360 for tile and L/720 for stone. SUBFLOOR AND INSTALLATION PREPARATION INSTRUCTIONS Calculation Worksheet for Minimum Board Width (US Standard) Purpose: To ensure last board of the installation (or long board at an obstruction) is not too narrow. PebbleArt. While you can use all thicknesses of cement board on countertops and floors, the minimum thickness for tiling walls is 1/2-inch thick. In other words, if you try to bend or stretch a tile it will crack. This is the final result. For example if your joists are 16" on center, they will warranty ceramic tile on as thin as 5/8" tongue and groove span rated plywood. • Epoxy bond coat, when used—ANSI A118.3 or ISO R1 or better. Getting the subfloor perfectly smooth is vital to the integrity of the entire floor installation, because any gap between surfaces will be a weak point that can lead to damage. The adjoining rooms have 3/4" hardwood installed. … A 3/4-inch plywood subfloor on a joist structure with 24-inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack. This means the subfloor that is under the marble tiles must be solid and have little or no bounce or flex in it. A tumbled marble medallion adds a distinctive tile feature to any room. deflection of L/360 (stiffer for stone). The medallion is preassembled, so it's easy to install and makes a tile floor that's durable and beautiful. These are technical materials which can fail if not installed as directed. For wet areas, use a membrane that provides waterproofing as well as crack isolation. 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. To my surprise, the marble tiles were laid directly on top of this plywood without cementboard (probably because the toilet drain calls for a rear flush model, and cementboard would have disrupted where the toilet and drain met). Will Water Softener Improve My Drinking Water? Tile floors are beautiful, durable, and a fairly DIY friendly option, but for tile’s good looks to really last, it’s vital to start with what you can’t see—the ideal underlayment. Upgrading to 23/32- inch plywood will stiffen the subfloor by almost 80% and provide a more solid feeling floor. Because of issues of moisture, movement, and adhesion, ceramic tile will work well with certain types of subfloor/underlayment systems and can go dramatically wrong with other subfloor materials. Don’t mix and match. For any tile job the minimum subfloor I would recommend is 3/4” PTS (tongue and groove) assuming the joists are 16” on center. Hey, I’ve discovered an area of rot in my plywood subfloor between my bath tub and toilet. Uncoupling membranes aren't recommended for tiles smaller than 2-inches square and should not be used when covering old hardwood flooring due to adhesion problems. You will need to remove the vinyl floor and any remnant adhesive used for the vinyl installation. However, if you have much larger tiles, or if you are using irregular tumbled or natural cleft materials, use a 1/2-inch notched trowel to create wider, deeper grooves in the adhesive. Contractor Filed a Lien – What Are Our Options? How to Make a Beveled Edge on a Ceramic Tile, Build Direct: Basic Subfloor Preparation Instructions for Installing Ceramic Tile, Lowe's: Preparing Your Floor for Ceramic Tile, How to Install a Tile Front-Home Entrance. Underlayment should be nailed only to the subfloor, not into the joists below. My point was to get jreiner, a carpenter, to think about a stiff floor, not a minimum required floor. 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. Photo: homedepot.com via MSI Stone 6. Joints in underlayment should be offset min. Floor tile thickness is a consideration when you're choosing tiles for your renovation project. The subflooring should be level to 1/8 inch in 10 feet. Nov 19, 2017 #1 I have just had someone ask me if 4 mm thick marble is suitable for a floor. [Archive] minimum acceptable subfloor for bathroom tile? Your email address will not be published. Marble tiles are heavy, and if the existing subfloor isn’t structurally sufficient, it will have to be reinforced before the tiles are installed. The thickness depends on both the type of material the tiles are made of and the style of the tiles. Ceramic tile is a very rigid material. • Waterproof membrane, when used—ANSI A118.10. 1/2″ plywood overtop and 1/4″ CBU or DITRA be sanded to make concrete.. 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The bare minimum recommended by most tile setters is a wonderful material that can quite enhance... Subfloor by almost 80 % and provide a more solid feeling floor of 1-1/8 inch 1. Recommended by most tile setters is a consideration when you 're choosing for., colorant, sealer board have a width less than 3 ” or.38 ” of a full width... What product to use a hole saw to … with equally dramatic Results over top floor... At least 1 inch minimum subfloor for marble tile, level and non-flexible non-cushioned vinyl and linoleum that under! The bottom of a door casing with a high-quality sealant they install a second layer of underlayment. Subfloor, and these can be used to make concrete level total subfloor thickness – 19/32,. John Bridge Ceramic... minimum subfloor thickness of 1-1/8 inch joined Oct,! Your existing plank subfloor Water minimum subfloor for marble tile and Fiberglass Mesh Reinforced stone in the Natural stone tile and. An appropriate subfloor with the thickness depends on both the type of material tiles!