If the mortar is too thick, it may not transfer to the bonding fleece under the DITRA as required. The guys got started by sweeping the floor with foxtail brushes to ensure a clean surface. After about 24 hours, itll be ready for tile, and meanwhile Jim and Rich are getting started on the over half. Even a perfectly level subfloor wont guarantee a beautiful, long-lasting tile floor. DITRA, as a decoupler, helps prevent substrate movement from damaging flooring; When using CBU, the tile is mortared directly to the board, and expansion or shifting of the subfloor is likely to crack or pop the tile or grout. Shop Wood, Laminate, & Vinyl Installation, Calculate Estimated Shipping + Handling Cost. Schluter-DITRA simply takes the functionality of a sand layer to the next level of performance by also providing a waterproof vapor barrier. Emrah Oruc is a general contractor, freelance writer and former race-car mechanic who has written professionally since 2000. There should be NO overlap. However, Jim and Rich opted to fill the cavities, let it dry, and begin laying tile another day. Specifically Designed For Ceramic And Stone Tile Installations Ditra Provides Uncoupling To Prevent Cracked Tile And Grout. This makes it the right choice for use with DITRA. Also important to use a damp sponge to wipe down the plywood before you put down the ditra mat. Thanks for visiting! Pro-Tip:A small v-notch trowel is also acceptable. Please turn it on so that you can experience the full capabilities of this site. Required fields are marked *. I have walked the floor a few times and you can see why the product works. Heres an overview of the locations where you can take advantage of the performance DITRA offers. We work closely with qualified flooring contractors throughout the USA to provide installation and repair services for home flooring products. Note: Schluter and Bostik generously donated the DITRA and the Ditra-Set Mortar for this project, enabling the development of this Pro-Follow guide. If you need to purchase a higher quantity, please contact Customer Care at. You should see full contact between the fleece-webbing and the thin-set mortar. It can be confusing because when we hear uncoupling, we think of something being coupled or connected first. This is no different than when a foundation is poured in horizontal sections and allowed to set before another layer is put on topyou get leaks because it is not a cohesive whole. or over,? With DITRA below and tile above, air doesnt reach thin-set very readily, and it would require up to 60 days for modified thin-set to properly dry before it could be grouted. The tile assembly needs to be able to handle that which is why its important to incorporate an uncoupling membrane that allows for in-plane movement. Select a thin-set mortar designed for application over the substrate you are working with. Over the last eight years we've documented hundreds of home improvement and DIY craft projects along with many tool and material reviews. DITRA is also noted for its ease of use when compared with materials like cement backer board. Is it ok to use detra when transitioning from plywood to slab? Jim and Rich are professional tile contractors with decades of experience. After the DITRA was laid out, the guys mixed more Ditra-Set, and again, they let the mortar slake for about 15 minutes. nice! In the meantime, you may browse the digital edition. Allow the mortar to sit for 5-15 minutes before using it. The little picture next to these guidelines does show two layers of flooring. Pro-Tip: Expect to use one 50 lb. Very nice work there. Open time for Ditra-Set is about 20-30 min so the guys only mixed what they could use in that timeframe. In addition, the waterproof performance of DITRA is essential in many applications. This versatile product can be used outdoors when installing tile or stone. A waterproof barrier can be created using Schluter-DITRA because it is made from waterproof polyethylene. Can ditra be (or is it recommended to be) installed over cement board? Adjacent pieces of DITRA were butted against each other, and Jim and Rich were careful to avoid overlap (thereby creating a height difference). I believe the answer to that is NO. The result is that the tile is actually bonded only to the squares and not to the DITRA between the squares as much, but that ends up being OK. Note: Work from the middle of a piece of matting toward the edge in order to ensure that youve removed all air pockets and excess mortar. When installed, the orange, square-pattern surface of the DITRA should face up. DITRA is fully waterproof; CBU allows water to pass through it, but is not damaged by the water. Mix thinset mortar in a 5-gallon bucket with an electric drill and mixing attachment. Ditto. Looks like a lot easier application, but just wondering. I love reading your articles and REALLY love the quality and finished product. Schluter Systems, How to Calculate How Much Wire You Need for Your DITRA-HEAT Installation, The Last Word (We Hope) on Vapor Barriers, A Builder's Guide to Breathable Indoor Air, Building a Deck With a Welded Steel Frame, Housing Market Slows as Fed Takes Aggressive Approach to Combat Inflation, When Hidden Defects Complicate a Simple Deck Replacement. Step 4: Measure the space, and cut the first piece of DITRA to fit. I am confused as to how youre allowed to walk on DITRA that hasnt set up yet. Less installation time produces lower estimates from contractors and less hassle for DIY installers. The subfloor may be: Floors Requiring Waterproof Installation: Gypsum concrete and wood substrates such as plywood and OSB will absorb moisture and expand. Ditra is sold by the linear foot. Also, what size trowel is recommended for laying the Ditra. Here are the tools and materials needed to complete this phase of the project. the space is left for expansion and contraction. Check out our guide to the many other types of underlayment. For this project, the DITRA is being installed over radiant-heating element embedded in self-leveling mortar. I personally wouldnt prefill the ditra waffling as done in this project. Tile is installed above the CBU using thin-set mortar. Sorry you zip code is not valid or we unable to ship items to your destination. Thankyou. I just pulled up a tile and it was still very wet after 5 days. So yes, be sure and leave a little space for this to happen. In addition, DITRA-XL and standard 5/16 tile creates a floor height that is level with standard 3/4 hardwood flooring. joist spacing with single-layer OSB or plywood subfloor for ceramic and porcelain tile installation, Double-layer OSB or plywood for natural stone installation, Existing vinyl over a suitable subfloor for ceramic and porcelain tile installation, Structural plank subfloors for tile or stone installation, Gypsum concrete underlay over wood or concrete subfloor, Exterior concrete floors, patios and walkways. I think I learn something new with each article I read, no exception here. DITRA is installed directly onto the wood subfloor, and tile is installed on top of the DITRA. The decoupling performance neutralizes any movement of the substrate that would otherwise damage the stone, tile or grout. Start by applying enough thin-set mortar to the top of the DITRA to fill all of the cut-back cavities. By the way, contractors sometimes refer to this product simply as DITRA, and we will too. Once the DITRA membrane is in place and before any tile is set, the next step is to cover the seams with an 8 wide layer of unmodified thin-set centered on the seam. See A Word About DITRA Thickness below for more information on your options. Im continuously impressed with the level of work I see from Jim and Rich. This means that when you use a notched trowel on it, the ridges created must stand up rather than settling. Our expert design professionals are here to help, for free. Consider in-store pickup or contact Customer Care at, You can not purchase more than 3 samples of the same product, You can not purchase more than 10 samples in one order. I think what I like about it the most is the innovation in it. Heres a look at half the basement covered in DITRA. The manufacturer offers a definition that we can expand for further explanation. Ditra Also Serves As A Waterproofing Layer That Protects Moisture-Sensitive Substrates Such As Plywood/Osb. Using a flat trowel, Jim and Rich filled all the cut-back cavities with Ditra-Set. Your email address will not be published. You will be notified by email when the item arrives. Aside from preventing moisture from seeping into the subfloor, DITRA prevents the tile and grout from cracking by isolating the movement of the subfloor due to expansion and contraction. See the DITRA installation guide for details on selecting the right type of thin-set for the project. So the homeowner in the example here should be fine. The grid pattern increases the structural hold of the thinset and prevents tiles from moving or cracking. Schluter-DITRA: Your Uncoupling Questions, Answered. Installing tile directly on concrete WILL result in significant cracking of the flooring within a short period of time when the concrete expands and contracts with changes in temperature. Any guidance would be greatly appreciated. Read our Terms of Use and Disclosures page for more information. Jim and Rich advise against spreading too much Ditra-Set at one time to prevent it from drying too quickly and because its easier to keep the DITRA lined up. CBU structure does not offer this protection. The area between the cut-out squares is actually flexible, but the squares themselves are rock-solid. i.e. Shipping charges may apply. Lay a 5 wide strip of Schluter KERDI-BAND over the seam, and press it down firmly with the flat side of your trowel to remove air and excess mortar and to ensure solid mortar coverage to the back of the KERDI-BAND. Our goal is to deliver high-quality information to help homeowners decide which type of flooring to install in their homes. By comparison, CBU backer board cost is $0.70 to $1.10 per square foot. Here are the types of exterior applications where the use of DITRA is recommended. This is the key to preventing the transmission of the movement that is the main cause of cracking in tile floors. Copyright 2022 Zonda Media, a Delaware corporation. The KERDI-BAND is applied using unmodified thin-set mortar. This eliminates the transfer of stresses from the substrate to the tile covering. They also scraped away excess mortar that oozed underneath the drywall. Step 3: Embedding the DITRA First, apply the DITRA fleece-side down and solidly embed using a float or a DITRA roller. Subsequently, drying takes place only through the tile joints. It can be installed over a variety of substrates including plywood, OSB, existing vinyl, structural planks, and concrete. This allows for quicker mixing without clumps and prevents mortar from sticking to the edges of the bucket. Schluter DITRA / DITRA XL ensures a lasting installation by allowing independent movement between the tile covering and the substrate. Jim and Rich unrolled sections of DITRA, cutting it to length with a utility knife. When you prefill the voids and then allow the mortar to dryyou have created a breakpoint between old and future mortar. A roll of DITRA can hold memory or shape, sometimes causing it to bounce or curl during installation, especially at the end of a roll. Or maybe I am wrong altogether and DITRA set is magical and does not conform to the laws of physics like gravity and displacement (the most likely explanation). truss and I-joist systems; green concrete; gypsum-based screeds; pre-stressed and post-tensioned concrete; and radiant-heated floors. It is a waterproofing membrane and separation layer between tile and the subfloor, which is often made of wood. (19 mm)tongue-and-groove SchluterDitraand SchluterDitra XL Feature: SchluterDitra comes in 39" width rolls. Step 1: To start with, choose a quality thin-set mortar for sticking the DITRA to the subfloor/substrate. I was all set on putting another layer of osb 11/32 over the floor but was told by Home Depot with the Xl Ditra thats not necessary for Natural Stone only if I was using other other Ditra. DITRA strongly suggests you use unmodified thin-set. Pro-Tip: The guys say that the most likely mistake when installing DITRA is failing to fully seat the matting in the mortar. What size trowel is recommended for laying tile over Ditra? Should You Consider Switching to Cost-Plus Pricing? According to Schluter, the material is, a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to its underside. Step 5: Apply the thin-set to the substrate with your notched trowel at a 45-degree angle. However, since DITRA is made of plastic, the chalk can be rubbed-off easily. That said, the most important part of the whole thing is the ditra itself, specifically its uncoupling from subfloor, substrate, etc. How do I remove the memory from a role of DITRA? My husband is trying for the first time to install a tile floor. See A Word About Unmodified Thin-Set below for an explanation. DITRA or DITRA-XL depending on the requirements of the job, DITRA-Set mortar or similar thin-set mortar, DITRA trowel or other suitable option (see Step 2 above) for applying mortar to the substrate, A 1/4 x 3/8 trowel for applying mortar to the top of the DITRA for tile installation, Utility knife for cutting the DITRA underlayment, Chalk line for laying out the DITRA (optional), Electric drill A hammer drill with a handle works best. Now we dont know what to do with those gullies and dips. Wood expands and contracts with moisture and temperatures changes and flexes when bearing loads. Get all the latest information on Classes, Events, Sales and Offers. DITRA can be used as a waterproofing membrane for vapor and moisture management, and to support / distribute heavy loads. Oruc holds a Bachelor of Arts in political science and a minor in economics from the University of Delaware. They do this because its difficult to snap chalk lines over DITRA even though it takes longer to complete the job. Step 7: Raise a corner of the DITRA to check to make sure youre getting 100% contact between the thin-set and the fleece backing of the DITRA. Lets look at the pros and cons of each material in head-to-head comparison. For more on buying, installing, pricing and caring for tile and stone floors click here. Hi, we're Ethan, Jocie, Kim and Fred. : minimum subfloor thickness 23/32, 3/4 nom. Step 6: Roll out the pre-cut DITRA over the mortar, fleece-side down, and press down the DITRA using a float or screed trowel to remove all air pockets. Step 3: Select DITRA or DITRA-XL underlayment depending on the jobs requirements. We have adjusted the number of products entered as the maximum quantity threshold is 9999. The thinset is also so thin (and absorbed by the fleece layer) that it isnt displaced by foot traffic either. For example, wood expands and contracts with seasonal changes. Step 2: Purchase a suitable trowel for the thin-set mortar between the substrate and the DITRA membrane. There would have been no problem accomodating dips of less than a mm with the tile bed had you followed the instructions. The DITRA-XL cost is $1.75 to $2.25 per square foot. (10 mm) What mat dimensions does Ditra XL com in? 2. It comes in long rolls (i.e. They worked carefully to completely fill all the space and avoid leaving ridges on the surface. I would like to know, if Merkrete 710 premium plus mortar, is a good choice to install Schluter Ditra underlayment. Our website is supported by advertising. (on center) joist spacing with single-layer OSB or plywood subfloor for ceramic and porcelain tile installation, 24 O.C. With the flexible layer of DITRA installed, the tile isnt adhered to the substrate. Next, they would have set the tile in the typical manner. Apply a thin layer of mortar with the flat side of the trowel, to produce solid contact with the substrate. A quality tile installation includes an uncoupling membrane, such as DITRA, DITRA-XL and DITRA-HEAT. The key to understanding why this membrane will greatly enhance the structural integrity and durability of your tile floor is to get a good handle on just what Schluter-DITRA is. How do I stop chalk lines from rubbing-off? Quick Links: What is DITRA | How Does It Work | Where Can You Install It | DITRA vs CBU | Installation Guide | Price. On the other hand, unmodified thin-set does not need air because it cures rather than dries. It must fill all of the cavities. Step 1: Ensure correct mortar consistency When installing DITRA, ensure the thin-set mortar is mixed to a fairly fluid consistency, but still able to hold a notch. Schluter does not recommend using a latex-modified thinset for the next steps because it cures differently than unmodified thinset. Wood will also be damaged by water, something this polyethylene membrane prevents. Its so nice to see professionals taking their time to do things right. Stresses between the concrete or wood subfloor can still cause tiles to crack and delaminate and for grout joints to crumble. If the mortar skims over, remove and reapply before installing the membrane. It does not have to be uniformly covered. The thin-set mortar packaging will provide complete instructions for mixing and slaking. Step 8: Trim the DITRA around drains, support posts, door jambs and other obstacles while the mortar is still wet or pre-trim the piece when fitting it, before mortar is applied to the subfloor. Mark the DITRA with a marking pen and cut it to size with a utility knife. One reason was that they couldnt use the chalk line on the ditra mat. For the best experience on our site, be sure to turn on Javascript in your browser. In addition to showers and tub surrounds, you should consider using a waterproof barrier in the bathroom, kitchen, laundry room or basement. instructions! DITRA matting and tile help the unmodified thin-set retain more of its moisture as it cures, and this creates a stronger bond than modified thin-set can achieve. If so, what are the width and roll lengths. Theyve used DITRA extensively on many jobs and highly recommend it, especially over cracked concrete. Pro-Tip:DITRA can be walked on immediately after; theres no need to wait for the mortar to cure. The major reason is that concrete can expand nearly twice as much as ceramic tile and grout. Schluter advises that at this point its perfectly acceptable to begin laying tile with an unmodified thinset. How to Install Carpet Tiles With Hardwood Flooring on Half of the Room. They could have just used hair spray over the chalk line and it would stay put. Read the product labels for the information regarding application over wood or concrete substrates. Schluter-DITRA underlayment is used effectively in a wide range of flooring applications. Note on Uncoupling: Youll come across the term uncoupling when discussing Schluter-DITRA with contractors or retailers; you may hear it described as an uncoupling membrane. . How do I achieve proper thin-set coverage? Your browser's Javascript functionality is turned off. When combing mortar, hold the trowel at a 45-degree angle. The type of thin-set mortar (modified vs. unmodified) used to install DITRA depends on the substrate. ugh. There is no place for the water to evaporate and will not dry. can Ditra be used over exterior expansion joints? Commonly called CBU or cement backer board, or more technically, cementitious backer units, cement board underlayment was originally designed as a substitute for drywall in showers because it is resistant to moisture and mold and wont deteriorate when wet. I am doing a remodel/addition and will end up with basement, crawlspace and slab all with continuous tile. What is the purpose of the 1/2 margin around the perimeter? floor joists), eliminating the need for a second sheet of plywood or backerboard, Ideal for interior and exterior tile and stone installations. Using Ditra Xl over OSB subfloor planning on using natural stone tile. In addition to waterproofing, this critical membrane separates the tile assembly from movement in the underlying substrate, thereby eliminating the leading cause of cracking in a tiled surface. DITRA-XL (5/16): Allows you to install ceramic tile over a single layer of plywood or OSB subfloors on joists with wider spacing such as 24 inches on center. Heres a step-by-step DITRA installation guide. Step 9: Once the DITRA is down, you can begin setting tile immediately. I cant wait to see the finished product. Next, the guys would unroll the DITRA over the Ditra-Set. Schluter recommends mixing the thinset to a fairly fluid consistency (but still able to hold a notch).. Availability: Ships from Factory (More Info), Shipping: $49.95 Flat rate ground shipping for unlimited Schluter products in this order. Now, lets break down this definition into its parts: Schluter-DITRA membrane reduces cracking by absorbing the stresses created when the substrate beneath it moves due to shifting, expanding or contracting. However, over concrete Schluter recommends an unmodified thinset mortar like the Ditra-Set shown here. How to Install T-Mold Transitions on Tile Flooring, Schluter Systems: DITRA Installation Instructions, Habitat for Humanit of Sonoma County: Tile Installation with DITRA Sheet, The Floor Elf: Effects of Improper DITRA Installation, 9 drought-tolerant plants for any outdoor space, How to Install Slate Tile on the Walls for a Wood Stove, How to Install Cement Backerboard for Flooring, All the "waffles" of the DITRA must be completely filled with mortar before the tile can be set. Smooth the DITRA by pushing it firmly into the mortar with a trowel so there are no lumps or high spots. Yes, the rolls are 3'3" x 53'3" it is the 3rd option on this product page: https://www.masterwholesale.com/schluter-ditra-xl.html, we need to update the title but the SKU is S DITRA XL175. Step 10: Comb additional thin-set mortar over the DITRA with a notched trowel and solidly embed the tile into the mortar. The DITRA trowel from Schluter is the best choice. It is totally false that you can walk on it or tile immediately because the next day she called me and told me that there were big dips and unevenness because of where we walked on the ditra and squished the mortar with our walking on it. Schluter-DITRA also offers products for waterproofing drains and wall-to-floor connections. If so what needs to be done at the transitions? The term refers to the fact that the DITRA material prevents the tile mortar from sticking to the subfloor. this insures the plywood is clean and because you have pre moistened the plywood it wont pull moisture from the thin-set too quickly which can weaken its ability to set up firm without crumbling. He has been published in "The Family Handyman" magazine and has experience as a consultant developing and delivering end-user training. Step 2: Mortar application Apply thin-set to the area where the DITRA is to be installed, using the correct trowel size: x 3/16 (6mm x 5mm) v-notch OR A DITRA trowel: 11/64 x 11/64 (4.5mm x 4.5mm) square-notch. Can the Ditra be placed flushed to the wall, or is the 1/2 margin required? Here are the specific types of concrete subfloor that should be covered with DITRA prior to the installation of tile or stone flooring: Floors with Radiant Heat: DITRA is an excellent choice for use in any application where radiant heating is installed in the floor. I just used Ditra for a living room tile job the base thinset (on concrete) dried like a champ, but when tiling, the pre-mix mortar the client wanted to use has taken over a week to dry. Its available on eBay too. These spaces allow excess moisture and vapor to escape, reducing the potential for it to damage the layer of tiles above. DITRA membrane is available in two thicknesses, 1/8 and 5/16. ya. Professional tile installers and DIY homeowners use Schluter-DITRA matting to prevent the cracking of tile and grout caused by movement substrate, the foundational material beneath the tile. Does this get worked out in the fill the voids process whereby you basically re-float the surface and still have the ditra layer youre after? NOTE: The #1 cause of problems when using DITRA is failing to make sure that 100% of the fleece backing is in contact with the thin-set. 3. More information here. He is using the Ditra underlayment, and it is being placed over a concrete floor. The goal was to make full contact between the fleece matting and the mortar. Thanks for listening. Items may arrive in multiple shipments. ft. of substrate. Articles will be published online soon. Noticed that the guys doing the demo opted for leaving the matting to dry and then tiled the next day. DITRA (1/8): Minimizes total thickness of the installed floor, and this reduces the transition to flooring that is lower such as vinyl, carpet or engineered wood. joist spacing with double-layer OSB or plywood subfloor for ceramic and porcelain tile installation, 24 O.C. DITRA is really cool. Pro-Tip:Rich always began working the grout float in the middle of a section to stretch and press wrinkles outward. If they had begun laying tile, Jim and Rich would have filled a small section of cut-back cavities and then combed additional mortar over the DITRA. 1. Next, apply and comb a top layer of unmodified thin-set using a 1/4 x 3/16 trowel or the specially designed Schluter KERDI trowel with a 1/8 x 1/8 square-notched design. Some exclusions apply. DITRA is the right choice when installing flooring over concrete or other material that requires a moisture barrier to prevent damage to flooring. DITRA is a polyethylene tile underlayment manufactured by Schluter Systems. Then comb additional mortar using the notched side of the trowel. Best Laminate Floor Cleaner | 2022 Floor Cleaner Reviews, Best Mops for Hardwood Floors | 2022 Mop Reviews, Best Laminate Floor Cutter Reviews and Lowest Prices, How to Clean Laminate Flooring | 2022 Cleaning Tips, Kitchen Hardwood Flooring | What You Need to Know, 16 or 19.2 O.C. In reality, the DITRA membrane prevents the coupling in the first place. DITRA can be installed over these wood subfloor systems: Concrete Substrate: Concrete is a challenging substrate to cover with hard flooring such as tile and natural stone. Chalk lines are commonly used to mark the floor and matting during installation. Most retail flooring stores carry standard DITRA and DITRA-XL. Apply thinset mortar to the surface of the DITRA sheet with a V-notch trowel. In addition, These Schluter-DITRA Membranes are lighter, thinner, and easier to apply than any other underlayment. This item will be SHIPPED and should arrive in 714 days. Rich mixed the Ditra-Set with water using a mixing paddle, and he let it slake for 15 minutes before remixing. Install the remaining tiles and wait approximately 24 hours before grouting the joints. In fact, you dont even have to top coat before you lay tile you can put the thinset on in one step. (More Info). Heres why. DITRA offers faster, easier installation than cement backer board, especially when the project requires a large amount of trimming around obstacles such as support posts, drains, bathroom fixtures and door jambs. Just keep a bit of distance from the chalk line so you dont blow it away with the hair spray. Pro-Tip:Precutting and laying out all the DITRA gives it a chance to flatten out. This is because you used too much thinset to bond the ditra to the floor substrate. Other acceptable trowels are 1/4 x 3/16 V-notched or 5/16 x 5/16 V-notched models. Home Depot Coupons, Coupon Codes, 10% Off Sales FALL/WINTER 2020-2021, AJ Madison Coupons, Sales, Coupon Codes, 40+% Off FALL/WINTER 2020-2021, Lowes Coupons, Sales, Coupon Codes, 10% Off, Target Coupons, Sales, Coupon Codes, 10%-60% Off FALL/WINTER 2020-2021, Sears Coupons, Sales, Coupon Codes, 10% Off FALL 2020/WINTER 2021. Does Schluter recommend filling of voids before laying tile? i copied above url to give reply for a forum question, can i use Schluter under warm wire,? A persons foot doesnt have enough psi to compress or crush the molded plastic. Any problems with thinset applied over filled voids? What about using a latex-modified thinset? Combing the mortar in one direction also helps, making it easier to collapse the mortar ridges when embedding the DITRA. The types of heating that DITRA accommodates include electric thin-mat and wire heating and hydronic tubing. I just put a ditra underlayment on my daughters concrete basement floor. A Dozen Ways to Strengthen Your Remodeling Brand, The Empire Group Plans Large Build-to-Rent Community in North Phoenix, The Most Affordable Places to Retire in America in 2022, Yardi Matrix Reports Institutional Investment in Single-Family Rentals Is Rising, NAHB: Proposed Schumer-Manchin Legislation Could Affect Builders, New Conservation Community Lagoon Valley Materializes in the Bay Area, 7 Ways to Prepare Your Team to Sell in an Uncertain Market. Measure the room's dimensions with a tape measure. Unmodified thinset is a mixture of Portland cement which actually requires moisture to form a strong bond and achieves final set usually within 24 hours. Which thickness you choose depends on the needs of the project youre tackling. We just prefer this method, as do our tile installers. 1 m x 30 m), and its lightweight and easy to cut. The seams are taped and covered with thin-set. DITRA requires the use of more thin-set mortar than CBU, while CBU requires additional fasteners and joint tape. This will result in damage to floor covering installed over these materials. This is a technique called slaking, and it allows the water to fully penetrate the dry mix. It was soon discovered that CBU also works well as underlayment for tile and natural stone. Pro-Tip:Its easier to cut DITRA from the backside. NOTE: Applying a thin-coat of mortar to the back of the tile with the non-notched edge, a technique known as back-buttering, is recommended when installing tiles 12x12 or larger.
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