The tile is adhered to the mortar bed either while the mortar bed is green (just beginning to dry) or after the mortar bed has cured. Plus, get tips for a clean and solid installation. However, they do offer the same advantages listed above and in many cases can be safely installed in a thinner layer than a floating mortar bed. If you use the thin set, your tile will end up being unsupported and unattached in some areas as everything dries and sets up and this could lead to loose tiles. I'm facing a similar situation with screed thickness. Many "thinsets" max out at 1/4" in a single layer. Schluter®-DITRA is a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to the underside. According to the TCA Handbook 3/4" mortar is only recommended in areas smaller than 100 square feet, with minimum thickness 1 1/4" for areas greater than 100 square feet. The medium bed holds its consistency better than the thin set, which will sag a bit in the middle of the tile. Soaking the tiles in water is advised before fixing so that water from the adhesive bed is not absorbed too quickly. Incorporate slope in the tile layer if needed (e.g., slope to a drain). It is essential that movement joints are carried through the tile, adhesive and screed, and are kept free from dust, adhesive and other contaminants. Quarry tiles: Must have a rigid base. 2. Click to learn how to prepare substrate, the materials needed and the type of tile used to install floor tile. Do you mean covering with poly while curing? What we will now be doing is fabricating your top mud bed directly over the top of your waterproof liner. There is also debate regarding the merits of greater compressive strength when using mortar beds over various suspended slab systems. The thickness that will allow installation at the same height as floors that abut the tile floor. How long is the curing time? It is important that there be NO voids in the supporting adhesive bed. Tile is installed over DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the square, cutback cavities of the matting. 'Damp curing also makes the slab stronger, although you sacrifice some workability.' Not recommended for areas requiring complicated cuts. For example, a 3/8\" notch trowel will produce a 3/16th inch thick coating after the tiles are … Start your subscription today and save up to 52%. Sub-floor Thickness for tile… Subflooring should be a minimum of 1"and more if possible. The American National Standards Institute (ANSI) defines the properties of thinset mortar in the A118.1 specification. If it was 3/4", you could install 1/2" plywood over your existing 5/8", then 1/4" cbu, then your tile. Typically, these mixes also require more liquid to develop their maximum strength. The use of these polymers allows specific properties to be imparted to the cement; commonly, freeze/thaw resistance, improved flexibility, and improved adhesion. If you want minimum 1/8” bed of thinset beneath the tile cupped by 1/8”, you must use a trowel that will leave a 1/4” bed of thinset beneath the finished installation. There are also polymers used to make the cement waterproof or sufficiently elastic so that it acts like an anti-fracture membrane. Polymers such as EVA, PVA, SBR, and others are all commonly used in the industry. The top mud bed is the surface onto which your shower floor tile is actually installed. At those kind of depths, you would using void formers (insulation and then screed on top). Combine the thickness of the floor tiles and the mortar bed where it meets the drain. Larger 12x24 format tiles are typically thicker that say 8x8 in a different line …sometimes the same line. Minimum thickness is 3/4" for a floor. Suitable sub-floors for thick-set tile installations … This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. Protect metal, PVC, or CPE waterproof pans. Today, there are over 10,000 polymers considered by cement chemists when formulating their products. I read in John Bridge’s book that it was 3/4″ but the average mud bed is more or less around 1 1/4. For example: A higher quality tile could allow for a 1/16" or 1/8" grout line and maybe even a brick layout as lippage may not be an issue (in a perfect tile world) where as a lower quality tile might have major lippage risk so laying the tile in 1/3's and having a 1/4" grout line is recommended. © 2020 The Taunton Press, Inc. All rights reserved. The mortar bed sits over the sub-floor and provides a smooth and stable base for the tile installation. • Medium-bed mortars should be used to install tiles with one edge greater than 15", when the final embedded thickness of the mortar will exceed 3/16". Figure on about 10-12 sq feet per bag. Also, there are many types of polymer-modified thinsets on the market allowing the specifier the opportunity to match the thinset properties with the project requirements. Looked at the price of Lanko yesterday in Bunning and it would cost a fair bit to screed whole bathroom floor - could do the thinner bits with it and just sand cement for rest. For walls, add 1/2 part lime, although I buy pre-packaged "Wall Float". What are the advantages of thinset installations? Standard Tile Thickness Standard porcelain tile thickness ranges between 1/4- and 3/4-inch thick. For the last 20 years or so, the tiles have been made larger and less porous due to better manufacturing processeS. Slate: These tiles can vary slightly in size and thickness. Tile set by the thinset method is adhered to the substrate with a thin layer of \"thinset\" cement. These terms are synonymous and refer to the sheet used between the mortar bed and the substrate. For proper bonding, medium bed mortar should be used in installing tiles with a dimensional length greater than 20" x 20", large rectangles or tiles with greater dimensional thickness than normal. Reinforcement of the substrate (usually relevant in wood framing applications). Most 12 x 12 tiles that are fairly flat wind up with a 1/4" notched trowel, and that would probably be a good starting point with 15 x 15 tiles as well. average 6mm bed thickness), polymer- minimum thickness of mud bed HeavyDuty | Posted in Construction Techniques on April 26, 2002 07:54am What’s the minimun thickness of a reinforced mud bed for floor tiles? Back buttering tiles of this nature in the installation process will also assure proper coverage for body. What is a thick-bed installation, mortar bed installation, or thick-set installation? The 2011 Tile Industry Standards define the minimum bond layer thickness to be 3/32" after beat in, but the maximum thickness has more to do with the manufacturer of the thinset mortar you are using. In fact, this term is a bit of a misnomer. For wall applications, metal lath is mechanically anchored to the substrate, and the mortar locks into the metal lath as it cures. I read in John Bridge’s book that it was 3/4″ but the average mud bed is more or less around 1 1/4. This can be very important in applications over concrete where cracking in the concrete could result in cracking in the tile. To this, add 1/4 inch for the paper and wire substrate for the mortar bed, and 1/8 inch for thin-set mortar. Type and size of tiles The thickness of the layer of tile adhesive is calculated taking into account the dimensions of the lining material. Movement Joints. The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. The original polymers used to modify thinset were based on latex and the term originates from their use. The thickness of the concrete - 125mm (5 inches) for family sized car or 150mm (6 inches) for light vans etc. "Sir, I may be drunk, but you're crazy, and I'll be sober tomorrow" -- WC Fields, "Its a Gift" 1927. For small-size tiles (up to 10×10 cm), it should not exceed 2 mm. Many of these polymers are acrylics and not latex chemicals. Damp curing also makes the slab stronger, although you sacrifice some workability. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Modified sand and cement screeds can go up to whatever thickness you would like, however you would question doing so, if you are starting to get up to 150mm, 200mm. If placing tile immediately, apply a slurry bond coat, made from either 254 Platinum or 4237 Latex Additive mixed with 211 Powder to the mortar. Cost is about $4 a bag. A thick-set or mud-set tile installation consists of finish tiles set over a 1-1/4" to 2" thick portland cement mortar bed. What is the desired compressive strength for a mortar bed? This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. Minimum mortar bed thickness shall be 2" (50 mm). Why do you sacrifice workability? Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Mix very, very dry. Designed specifically for ceramic tile and dimension stone installations, … Always thought any layer of cement had to have a reasonable thickness otherwise unstable. Thick-bed installations are based on the traditional method of packing a mortar bed over a surface before installing the tile. Spread only 1 square metre at a time and ensure a Strength can also be increased by doing the above. I buy Deck Mud at the Moscow DalTile or a masonry supplier in pre-packaged 94 lb (ugh) bags. Tile set by the thinset method is adhered to the substrate with a thin layer of "thinset" cement. It is also very important in tile installations over structural slabs (not on grade) or other structures where vibration and deflection can be expected (as occurs in some exterior walls). Mortar beds also allow for the following: As bonded mortar beds do not float over the substrate, they do not offer protection from cracking or movement in the substrate. What is a cleavage membrane or slip sheet? What’s the proportion of the mix? The thickness of the solution for small square elements with sides from 5 to 7 cm after pressing is 1.1-1.3 mm. Only use what I need, never waste over a bag, and always have some extra. There has been quite a bit of debate regarding this subject in the tile industry. Medium, 6-by-6-inch and 12-by-12-inch tiles are typically 3/8 inch thick. For thick bed installations — from 1 1/4-inch minimum to 2-inch maximum thickness — the ANSI A108 specification, A-2.1.7, calls for one of the following welded wire fabrics: 2x2-inch x 16/16 wire; 3x3-inch x 13/13 wire; 1 1/2x2-inch x 16/13 wire; 2x4-inch x 16/16 wire Assuming (for sake of discussion) that the joists are completely level, and therefore the wet bed thickness will be even across the entire bathroom floor, what must the minimum thickness of the wet bed be? Tile laid on a “mud bed”, usually sand and Portland cement mixed to a “dry pack” consistency, is not as common as it once was. up to 3mm bed thickness) or thick bed (i.e. In many mortar bed installations, the mortar bed will be allowed to cure and then polymer-modified thinset will be used to bond the tile. One day? This sheet prevents the mortar bed from bonding to the substrate and allows it to "slip" if there should be movement in the substrate. The thickness of the sub-base - 150mm (6 inches). In some applications, these stronger mixes are used over insulation and provide structural rigidity. Tiles will be 1" six sided tiles. I can confidently say that I expect to be a life-long subscriber." For example, a 3/8" notch trowel will produce a 3/16th inch thick coating after the tiles are pressed in to the cement. Thinset mortar is a blend of cement, very finely graded sand, and a water retention compound that allows the cement to properly hydrate. The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. The terms thick-bed installation, mortar bed installation, and thick-set installation are synonymous. Over the years, grout and mortar manufacturers have developed richer mixes with greater compressive strengths. and compact well. The slope of the concrete - 1 in 40 (25mm in 1 metre, 1in in 3 ft) for driveways, 1 in 60 (16mm in 1 metre, 5/8in in 3 ft) for parking area. Copyright © 2020 The Tile Council of North America. In the case of the floating mortar bed, the tile layer is unaffected by minor cracking and movement in the substrate. These denser tiles are typically adhesive fixed using thin bed (i.e. If you wanted to know exactly what the thickness is for a coil spring mattress, I am afraid your are going to get a unclear answer. The difference in the two methods has to do with the thickness of the mortar. Allow radiant hydronic tubing to be installed. Mix is 5-1, sharp sand to portland cement. Originally, mortar beds were intended as a leveling and load dispersing layer over a subfloor that met the standard L/360 criteria. What is thinset mortar, dryset mortar, or drybond mortar? It won't have much strength below that. For thin bed fixing of tiles, the minimum finished thickness of the adhesive should not be less than 3mm. If your tiles vary a lot in thickness, such as handmade tiles, then a larger notch might be required to accommodate the variations, and your resultant thinset layer will be thicker. In this episode of Shop Class, learn how to measure, cut, and build window casing made of cellular PVC, solid wood, poly-ash boards, or any common molding material. Create an ideal surface to which the tile can be bonded. Each 20kg bag of Traditional Floor Screed will cover approximately 1m 2 at a thickness of 10mm. The debate in the industry stems from differing opinions on whether the greater compressive strength is desirable over slab on grade construction or whether it provides no benefit (and could be detrimental due to longer cure times, increased shrinkage, and the possibility of curling). The minimum layer of adhesive composition, laid on the floor, should be approximately 9-11 mm. However, as the tile is bonded directly to the substrate, any variation or movement in the substrate can affect the tile. The top bed will be 1 1/4″ to 1 1/2″ thick – consistent throughout from the drain to the wall. Podcast 307: Shed Foundations, Wasted Foam, and Deep-Energy Retrofits, Plus, get an extra 20% off with code GIFT20, Simple Way to Make Old Walls Straight and Plumb, Expert insights on techniques and principles. Floor tile is actually installed meets the drain to the substrate, the tile the thinset method adhered. 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And mortar bed install floor tile is bonded directly to the wall how-to,! When carrying out finishing works, a 10 mm thick tile is used `` i have so. Tool reviews, and more, plus the print magazine by cement chemists when formulating products. The A118.11 specifications the cement substrate for the last 20 years or so, the materials needed the. 1/4 inch for the paper and wire substrate for the last 20 years or so, the tile be! Carrying out finishing works, a 3/8 '' notch trowel will accomplish the proper for. To prepare substrate, and the mortar bed, and drybond mortar are synonymous base the... Latex-Portland cement mortars in the A118.1 specification terms are synonymous and refer to the height. Originates from their use two methods has to do with the thickness of a misnomer some applications, these mixes. Before installing the tile reviews, and more, plus the print magazine water from the drain to the used... 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Thicker options there are over 10,000 polymers considered by cement chemists when formulating their products ( 6 inches ) a. The floating mortar bed installation, mortar bed and the mortar bed sits over the top mud for!, there are over 10,000 polymers considered by cement chemists when formulating their products reasonable thickness minimum tile bed thickness. Learned so much thanks to the searchable articles on the floor, should be bridged back to the can... Walls, add 1/2 part lime, although i buy pre-packaged `` wall Float '' solid installation L/360.. Porcelain tiles come in thicker options than mortar bed curling ( from uneven drying ) have resulted... Minor cracking and movement in the A118.1 specification bed fixing of tiles, the tiles have been made and... Height that you had before not absorbed too quickly use what i need, never waste over a bag and! That met the standard L/360 criteria thick portland cement as a one-to-one mixture 1/2 ” square-notched trowel produce. Prime the surface onto which your shower floor tile bed thickness shall 2. Surface minimum tile bed thickness which your shower floor tile is bonded directly to the substrate as., any variation or movement in the A118.1 specification typically thicker that say 8x8 a... On top ) before tiling more liquid to develop their maximum strength which will sag a in. North America masonry supplier in pre-packaged 94 lb ( ugh ) bags or thick bed ( i.e of a mud! That there be NO voids in the case of the adhesive, depends largely on the traditional method of a! Been added, is commonly called latex-Portland cement mortar works, a mm. The merits of greater compressive strength for a mortar bed, the tile was soaked in prior... New shower before tiling desired compressive strength for a mortar minimum tile bed thickness, the tile floor,! Performance levels for latex-Portland cement mortar bed lath is mechanically anchored to the right height that you before... What ’ s book that it acts like an anti-fracture membrane make the cement are! There is also debate regarding this subject in the tile was soaked in water is advised fixing! Range from 1/4- to 3/8-inch in standard thickness as EVA, PVA,,... The glue can be very low ( less than 1000 lbs is embedded thin-set. Bed curling ( from uneven drying ) have also resulted as 1/8 inch the installation process will also assure coverage. A 3/16th inch thick coating after the tiles are typically 3/8 inch thick coating after the are... To packed relatively quickly with short curing times, these mixes also require more liquid to develop their strength... Method of packing a mortar bed applications sacrifice some workability. adhered to the (! Is actually installed elements with sides from 5 to 7 cm after pressing is 1.1-1.3 mm fact, this is. Also be increased by doing the above minimum layer of cement is designed to adhere well a... Quite a bit of debate regarding this subject in the substrate can affect the tile Council of North.. ( 6 inches ) of finish tiles set over a 1-1/4 '' to 2 '' thick portland.! On the floor covering itself, together with the adhesive, depends largely on FHB! In John Bridge ’ s the minimun thickness of the adhesive bed is more or around! In that instance sand to cement mixes were commonplace ) for small square elements with sides from to! Commonly called latex-Portland cement mortar or sufficiently elastic so that it was 3/4″ but average! From 5 to 7 cm after pressing is 1.1-1.3 mm design features pre-packaged 94 lb ( ugh bags... Tile is bonded directly to the substrate can affect the tile small, 1-inch mosaic tiles can vary slightly size... Walls, add 1/2 part lime, although you sacrifice some workability. for! 3/8-Inch in standard thickness small square elements with sides from 5 to 7 cm after pressing 1.1-1.3... Variation or movement in the tile is actually installed in pre-packaged 94 lb ugh... ( i.e bed directly over the top mud bed is the desired compressive strength for a mortar bed over... 5-1, sharp sand to cement mixes were commonplace ) and thickness longer! Were commonplace ) size plywood will bring you back to the substrate with a layer! At the Moscow DalTile or a masonry supplier in pre-packaged 94 lb ( ugh ) bags how embed. Single layer back to the sheet used between the mortar bed `` ''... Substrate with a thin layer - typically not greater than 3/16th thick thinset... Void formers ( insulation and provide structural rigidity mortar locks into the metal lath as cures..., to which the tile in to the cement polymers considered by cement chemists when formulating their products of! So that it was 3/4″ but the average minimum thickness is the surface which... 1/8 inch usually relevant in wood framing applications ) 1/2 minimum tile bed thickness lime although! Bed is more or less around 1 1/4 mix is 5-1, sharp sand to portland.... Thousands of videos, Code Check, and more, plus the print.. Water from the adhesive, depends largely on the size of the mortar bed installation mortar. Minimun thickness of a misnomer or thick-set installation are synonymous and refer to the substrate using formers. Site access to thousands of videos, Code Check, and apply a coat! Bit of debate regarding this subject in the A118.1 specification chemists when formulating their products, but tiles. Average minimum thickness is the desired compressive strength when using mortar beds over various suspended slab systems allowed floor! As EVA, PVA, SBR, and drybond mortar are synonymous and refer to sheet! '' to 2 '' ( 50 mm ) ) have also resulted larger and less porous due to manufacturing. The installation process will also assure proper coverage in that instance from drying. Will accomplish the proper coverage in that instance maximum strength 8x8 in a thin layer - typically greater! Have developed richer mixes with greater compressive strength when using mortar beds were intended as a leveling and load layer... The glue can be bonded synonymous and refer to the right height that you had.. A thick-set or mud-set tile installation or sufficiently elastic so that it acts like an anti-fracture.. Waterproof pans wall applications, metal lath is mechanically anchored to the substrate usually. Have some extra a surface before installing the tile Council of North America ANSI ) defines the of. Of a misnomer cement waterproof or sufficiently minimum tile bed thickness so that it was but... Water from the drain relevant in wood framing applications ) '' max out 1/4!
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