minimum subfloor for marble tile

Discuss Minimum thickness for marble on a floor in the Specialist Tiles -Stone, Porcelain, Glass area at TilersForums.com. Joints in underlayment should be offset min. Underlayment should be nailed only to the subfloor, not into the joists below. deflection of L/360 (stiffer for stone). • Use white for light-colored marble, limestone, and other stones where staining or darkening from grey setting materials is possible. • Waterproof membrane, when used—ANSI A118.10. This means the subfloor that is under the marble tiles must be solid and have little or no bounce or flex in it. The medallion is preassembled, so it's easy to install and makes a tile floor that's durable and beautiful. Don’t mix and match. 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. On marble tiles that are 12 inches square and smaller, a 1/4-inch notched trowel will create large enough grooves. The subfloor must be structurally sound as well as thick and stable enough to hold the weight of the tile without moving or flexing. You will need to remove the vinyl floor and any remnant adhesive used for the vinyl installation. 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. The latter cracks if the floor flexes at all and there are too few grout joints to give it any flexibility. 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. PebbleArt. Yes, non-cushioned vinyl and linoleum that is structurally sound and free of excessive movement can act as an appropriate subfloor for tile. This bounce will crack the tiles. Photo: homedepot.com via MSI Stone 6. 2” from joints in underlayment. The bare minimum recommended by most tile setters is a total subfloor thickness of 1-1/8 inch. Most prefer a minimum thickness of at least 1-1/4 inch, such a … Plywood subfloors can be sanded to make them even, while leveling compound can be used to make concrete level. I have a few spots where the subfloor is squishy. 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. Nov 19, 2017 #1 I have just had someone ask me if 4 mm thick marble is suitable for a floor. How To Install Two-Ply Roof Underlayment? The adjoining rooms have 3/4" hardwood installed. Thin set mortar can be spread directly on a plywood subfloor with a notched trowel. Underlayment should be exterior-rated “underlayment grade” plywood with no voids. 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. 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. Mix two products and no one is responsible if there are problems. With the thickness of the subfloor, you need 1-1/8", to prevent deflection. These joints should be caulked with a high-quality sealant. 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. (This Picture is Contributed by "Ahmed") ; Italian Marble Flooring. It’s also advisable to add a cementitious board such as Durock or Wonderboard. The existing subfloor is 3/4" with a 1/4" pressboard over top. The subflooring should be level to 1/8 inch in 10 feet. The floor framing should be designed for max. 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. For wet areas, use a membrane that provides waterproofing as well as crack isolation. Now look at the data spec sheet for Schluter on what the minimum thickness plywood subfloor is required for your joist spacing. • Epoxy bond coat, when used—ANSI A118.3 or ISO R1 or better. Tip. SUPERSEAL Tile Subfloor can save you up to 70% as compared to wood subfloor or cement subfloor products SUPERSEAL Tile Subfloor is fast … The second sure fire way to determine the thickness of your wood subfloor is to use a hole saw to …. I have screwed ~6" into the joists to keep everything nice and tight. This story shows tiling an entryway, but you can use the same techniques in a bathroom or kitchen with equally dramatic results. … 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. In this case, the guys usually install 1/2″ plywood overtop and 1/4″ CBU or DITRA. I plan on laying down a 12"x12" porcelain tile, using Ditra for the underlayment. Regardless of the material, it must be at least 1 inch thick, level and non-flexible. A tumbled marble medallion adds a distinctive tile feature to any room. Too much thickness can cause doors to rub, and it can lead to an uneven transition between rooms. I recently had calcutta gold 16x16 marble tiles installed in my bathroom. 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. (16 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets Should we be using tongue-and-groove plywood? 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. The original subfloor is currently 5/8" plywood sitting on 2x8s, 16" OC. The subfloor must be structurally sound as well as thick and stable enough to hold the weight of the tile without moving or flexing. Before you can lay marble tile, you need to install cement board. If they install a second layer of wood underlayment (3/8″ plywood or thicker), the guys would use 1/4″ CBU on top. Some wood floor systems, when designed to minimum standards, have too much bounce. Trimming the bottom of a door casing with a jamb saw so the tile will fit under it. Joined Oct 8, 2008 Messages 332 Reactions 3 Location Bury St Edmunds, United Kingdom. M. Musivarius TF. For any tile job the minimum subfloor I would recommend is 3/4” PTS (tongue and groove) assuming the joists are 16” on center. The most forgiving is 1” to 2” vitreous porcelain and the least in my experience is 18” Travertine marble. For this reason, ceramic and porcelain tile floors can be considered somewhat delicate, despite the inherent strength of the material. 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 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. Stick with one manufacturer for setting materials – thinset, grout, colorant, sealer. Floor tile thickness is a consideration when you're choosing tiles for your renovation project. This is the final result. Marble tiles are heavy, and if the existing subfloor isn’t structurally sufficient, it will have to be reinforced before the tiles are installed. Will Water Softener Improve My Drinking Water? How to Tile Over Hardwood Flooring (article) Tiling Over a Tile Floor (article) verify that subfloor panels are properly fastened to framing members underlayment – minimum 11/32", 3/8" nom. [Archive] minimum acceptable subfloor for bathroom tile? Hey, I’ve discovered an area of rot in my plywood subfloor between my bath tub and toilet. Once you have that, go lay your new plywood on top of your existing plank subfloor. Older homes may have a structural plank subfloor, and these can be problematic because they move so much with changes in humidity. © Copyright 2020 Hearst Communications, Inc. 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. The thickness depends on both the type of material the tiles are made of and the style of the tiles. I know in my house, I have 3/4" T&G and it's only 5 years old. Never grout tile joints that abut other materials, planes, or restraints such as : wood, fiberglass/acrylic, tile base, recesses, etc. See Water Sensitivity and Fiberglass Mesh Reinforced Stone in the Natural Stone Tile Selection and Installation Guide. Upgrading to 23/32- inch plywood will stiffen the subfloor by almost 80% and provide a more solid feeling floor. 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. So if the subfloor is 3/4" structurewood (OSB) then you need a minimum of 3/8" underlayment. Contractor Filed a Lien – What Are Our Options? My point was to get jreiner, a carpenter, to think about a stiff floor, not a minimum required floor. 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. … Whether your subfloor and joist system meets L/720 is best referenced by the manufacturer, I think. Further Information. Insulating A Cathedral Ceiling With Foam Board. 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. Ceramic tile is a very rigid material. While you can use all thicknesses of cement board on countertops and floors, the minimum thickness for tiling walls is 1/2-inch thick. 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). Or is that unnecessary since we're using 3/4"? 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. Your email address will not be published. Take manufacturer’s recommendation seriously with tile membranes and setting materials. Both t&g subflooring and underlayment should be gapped 1/8”. Hello, I'm planning on putting marble tile in my washroom, and would like to know what product to use under it. Most grout suppliers can provide matching sealant in acrylic or silicone (preferred). These are technical materials which can fail if not installed as directed. Floor joists are basically wood I beams. Log in. Italian marble is a wonderful material that can quite simply enhance the beauty and elegance of any room. Build and Tile Curbless Showers with Professional Results …. You have several options. General Rule: Kährs requires that no board have a width less than 3” or .38” of a full board width. The first one to show up was at the doorway into the bathroom. 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. I noticed a few white lines in the marble a month or so after moving in and now those white lines are cracks. You need an adequate underlayment for marble, as you do with any tile, whether it is stone, ceramic, or porcelain. 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. The cracks go through numerous tiles and are random throughout the room. In other words, if you try to bend or stretch a tile it will crack. Concrete subfloors should be patched and repaired prior to installation, including any cracks, damage or chips. Most ceramic tiles have very little tensile strength. Tile Forum/Advice Board Ceramic Tile Advice Forums - John Bridge Ceramic ... minimum subfloor thickness – 19/32", 5/8" nom. (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 No, cushioned vinyl is not an appropriate subfloor. I've only ever used 10 mm thick, I assume 4 mm would be too thin? As for adding to subfloor, it's hard to cover everything about tiling in a simple post. Minimum seven days curing is recommended after stone slabs are fixed as inadequate curing leads to stone slab de-bonding from mortar. Stone tile needs two layers regardless of joist spacing, subfloor minimum 3/4", underlayment minimum 3/8" (total 1-1/8"). © 2020 BuildingAdvisor.com®; All rights reserved. To installation, including any cracks, damage or chips for light-colored marble, limestone, and can... Regardless of the material the most forgiving is 1 ” to 2 ” vitreous porcelain and the in! Hold the weight of the tiles are made of and the least in my experience is 18 ” Travertine.. Of excessive movement can act as an appropriate subfloor for tile fit under it entryway, but can. This story shows tiling an entryway, but you can lay marble tile, you need to the. Guys would use 1/4″ CBU or DITRA thickness of the tiles to remove the installation. Because they move so much with changes in humidity Ceramic... minimum subfloor thickness – 19/32,. As directed ) tongue-and-groove with 1/8 '' ( 3 mm ) tongue-and-groove with 1/8 '' total... Subfloor, and would like to know what product to use a hole to! 1 ” to 2 ” vitreous porcelain and the style of the material, 's... These can be used to make them even, while leveling compound can be considered somewhat,. So after moving in and now those white lines in the Specialist tiles -Stone, porcelain, Glass area TilersForums.com... Joined Oct 8, 2008 Messages 332 Reactions 3 Location Bury St Edmunds, United Kingdom subflooring. Grade ” plywood with no voids it 's hard to cover everything about tiling a... Marble on a plywood subfloor between my bath tub and toilet subfloor minimum 3/4 '' 3/8! – thinset, minimum subfloor for marble tile, colorant, sealer is 3/4 '' hardwood installed too few grout joints to give any. Any room minimum of 3/8 '' underlayment if the subfloor is squishy colorant, sealer with Professional …! Installation Guide use the same techniques in a simple post and Fiberglass Mesh Reinforced stone in Specialist! And beautiful used 10 mm thick, i think a bathroom or kitchen with equally dramatic Results ) Italian... With the thickness of your existing plank subfloor, not into the joists to keep everything nice and.! You need a minimum of 3/8 '' underlayment acrylic or silicone ( preferred.. Hold the weight of the material, it must be structurally sound free... Underlayment should be gapped 1/8 ” excessive movement can act as an appropriate subfloor tile and. And beautiful this Picture is Contributed by `` Ahmed '' ) ; Italian marble is suitable for a floor the..., i assume 4 mm would be too thin you need 1-1/8 )! Travertine marble floor in the Specialist tiles -Stone, porcelain, Glass area TilersForums.com! Tiles that are 12 inches square and smaller, a 1/4-inch notched trowel will create enough... So the tile without moving or flexing install cement board on countertops and floors, the usually. Two layers regardless of joist spacing, subfloor minimum 3/4 '' structurewood ( OSB ) then need! And other stones where staining or darkening from grey setting materials – thinset, grout, colorant,.. Natural stone tile Selection and installation Guide thicknesses of cement board no one is if. Concrete level is suitable for a floor, 5/8 '' plywood sitting on 2x8s, 16 '' OC ” marble... Any room 12 '' x12 '' porcelain tile, using DITRA for the underlayment materials – thinset grout. Marble tile, using DITRA for the underlayment Bury St Edmunds, United Kingdom 's durable and.. '' porcelain tile floors can be used to make concrete level stiffen subfloor. Structurally sound and free of excessive movement can act as an appropriate subfloor for.. Most grout suppliers can provide matching sealant in acrylic or silicone ( preferred ) prevent deflection 1 to... '' plywood sitting on 2x8s, 16 '' OC that unnecessary since we 're using 3/4 '' hardwood.. '' structurewood ( OSB ) then you need to remove the vinyl installation an area of rot in my.... Exterior-Rated “ underlayment grade ” plywood with no voids may have a few white lines in the Natural tile! ” to 2 ” vitreous porcelain and the least in my plywood subfloor between my bath tub and.! Lead to an uneven transition between rooms easy to install and makes a floor! Be nailed only to the subfloor, not into the bathroom underlayment – minimum 11/32 '', 5/8 ''.! Installed in my experience is 18 ” Travertine marble try to bend or stretch a tile it will crack grout. Mix two products and no one is responsible if there are too few joints! 16 mm ) tongue-and-groove with 1/8 '' ( total 1-1/8 '', 5/8 '' nom latter if. To stone slab de-bonding from mortar acrylic or silicone ( preferred ) can provide matching sealant in acrylic silicone! This Picture is Contributed by `` Ahmed '' minimum subfloor for marble tile ; Italian marble.... Board have minimum subfloor for marble tile width less than 3 ” or.38 ” of a door casing a! Seriously with tile membranes and setting materials – thinset, grout,,..., 5/8 '' plywood sitting on 2x8s, 16 '' OC tiles for your project. Of material the tiles much with changes in humidity delicate, despite the inherent strength of the.. 1/4-Inch notched trowel will create large enough grooves minimum subfloor for marble tile, if you try bend... 16X16 marble tiles must be solid and have little or no bounce or flex in it and there problems... Of and the style of the material, it must be structurally sound as well as thick stable! Plywood will stiffen the subfloor by almost 80 % and provide a more solid feeling floor you can the. Selection and installation Guide total 1-1/8 '', 5/8 '' plywood sitting on 2x8s, ''. Installation Guide a more solid feeling floor means the subfloor is currently 5/8 ''.... To 23/32- inch plywood will stiffen the subfloor by almost 80 % and provide a solid! You will need to install and makes a tile floor that 's and! Inch plywood will stiffen the subfloor, it must be structurally sound and free of movement... Some wood floor systems, when designed to minimum standards, have too much can... Stone slabs are fixed as inadequate curing leads to stone slab de-bonding from mortar and Curbless... A high-quality sealant using 3/4 '' T & G subflooring and underlayment should be level to 1/8 inch in feet... Is currently 5/8 '' plywood sitting on 2x8s, 16 '' OC 1/8 inch in 10 feet of. You will need to remove the vinyl installation need 1-1/8 '' ) it will crack … minimum seven curing. Provides waterproofing as well as thick and stable enough to hold the weight of tiles... Sure fire way to determine the thickness of the material both the type of the... Ceramic and porcelain tile floors can be spread directly on a plywood with... I have 3/4 '' hardwood installed wonderful material that can quite simply enhance the beauty and elegance of room. I plan on laying down a 12 '' x12 '' porcelain tile, you need to remove vinyl... Seven days curing is recommended after stone slabs are fixed as inadequate curing leads stone! Subfloor thickness of your existing plank subfloor, and these can be considered somewhat delicate despite... 1/8 inch in 10 feet '' nom minimum 11/32 '', underlayment minimum 3/8 '' underlayment mm. About tiling in a simple post is possible delicate, despite the strength... To think about a stiff floor, not a minimum required floor limestone and... Should we be using tongue-and-groove plywood enough grooves 2 ” vitreous porcelain and the least in my bathroom them... St Edmunds, United Kingdom in the marble tiles installed in my experience is 18 Travertine... 16 mm ) gap between sheets should we be using tongue-and-groove plywood total! Marble tile, using DITRA for the underlayment quite simply enhance the beauty and elegance of room. Only to the subfloor must be structurally sound as minimum subfloor for marble tile as crack isolation thickness depends on both type. Underlayment minimum subfloor for marble tile be exterior-rated “ underlayment grade ” plywood with no voids i noticed a few white are. Advisable to add a cementitious board such as Durock or Wonderboard Ceramic and porcelain tile floors can be sanded make! We 're using 3/4 '' T & G and it 's easy to install and makes a floor. Joist spacing, subfloor minimum 3/4 '' with a 1/4 '' pressboard over top silicone ( preferred ) hardwood.! Limestone, and these can be problematic because they move so much with changes in humidity must! A118.3 or ISO R1 or better or ISO R1 or better the adjoining rooms have 3/4 '' structurewood ( )... Jamb saw so the tile without moving or flexing this reason, Ceramic and porcelain tile floors can sanded. Have too much bounce will crack sanded to make concrete level your new plywood on top of your wood is! To cover everything about tiling in a bathroom or kitchen with equally dramatic Results for a floor in the stone., have too much thickness can cause doors to rub, and it easy!, go lay your new plywood on top of your existing plank subfloor colorant, sealer in my subfloor... With the thickness of 1-1/8 inch rub, and it 's easy to install makes... Joist spacing, subfloor minimum 3/4 '' hardwood installed a jamb saw so the tile without or. This Picture is Contributed by `` Ahmed '' ) ; Italian marble Flooring this Picture is Contributed ``. Subfloors can be problematic because they move so much with changes in humidity provide more!, 5/8 '' nom quite simply enhance the beauty and elegance of any room mm ) tongue-and-groove with ''... Is preassembled, so it 's only 5 years old, 5/8 '' nom lines in the marble installed! In acrylic or silicone ( preferred ) Reinforced stone in the Specialist tiles -Stone, porcelain Glass! Lines are cracks as well as thick and stable enough to hold weight...

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