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What type of thinset to use on concrete floor

Thinset is an adhesive cement used to secure floor and wall tiles to concrete surfaces. The word thinset is sometimes used interchangeably with mortar, because it's a type of modified mortar made specifically for tile. Should I use modified or unmodified thinset Backer board:For backer board on floors, specifically cement board and fiber cement boards (think Hardibacker), it's my understanding that it doesn't matter which thinset you use. The thinset doesn't need to bond to the plywood. Instead, it's part of a system with the fasteners. The nails or screws hold it down and the thinset holds it up

EMERGENCY Phone HELP from Tim - Call is FREE if not satisfied: https://shop.askthebuilder.com/15-minute-phone-or-video-conversation-with-tim/ FREE Quick Star.. Permaflex 300 LHT is a quality thinset mortar that is essential for installing large heavy floor tile. Bedding thickness can range from 3/32 to ¾. It is ideal for installing the following types of tile

What is the best thinset to use? - True DI

  1. Therefore, it's best to use unmodified thinset when working with an impervious installation membrane like Prodeso for installing radiant floor heating. It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious
  2. Thinset (aka the bed sheet) is difficult to get perfectly level, so you need a very strong flooring type to hide any imperfections. Ceramic, glass and stone tile floor coverings work great with latex-modified thinset. Vinyl tile, on the other hand, is too flexible, making it too susceptible to showing unevenness
  3. Wetting it will undoubtedly help when removing thinset from different tile types. All Done. So, you now know how to remove this adhesive from concrete and even the process of removing thinset from grout lines. Remember, as I mentioned above, it's a tough adhesive, so no matter what method you use, you're going to have to be persistent
  4. Thinset is a mortar that is made of Portland cement, silica sand, and moisture-retaining agents. Thinset tile mortar has a smooth, slippery consistency, similar to mud. It is applied to the substrate with a notched trowel. Standard and Pre-Mixed Thinset
  5. You can apply the tile to the Thinset liquid resurfacing slurry, but this is only recommended for experts who are use to the fast setting time. A thicker mixture is created with Thinset powder and..
  6. The Laticrete 254 Platinum Multipurpose Thinset Mortar is one of the best multipurpose adhesives we offer. It is a polymer-fortified thinset mortar for both interior and exterior installations that only needs to be mixed with water

When installing new stone, ceramic or porcelain tiles over a vinyl tile subfloor, thinset is definitely the way to go. This will create small scratches in the surface, which will give the thinset some texture to bond to. The second is to apply a skim coat of thinset, which is generally ½ to ¾ inch thick Mastic is an organic glue made from the sticky resin of the mastic tree. It's available as a thin-liquid, thick glue, or a sticky paste. Liquid Nails® would be a notable example of the thin-liquid form where it comes in a caulking tube and squeezed out along a wall or joists to hold load-bearing walls and ceilings in place Rough, damaged concrete can be made new again with thinset mortar. Even properly laid concrete can crack, or become pitted because of harsh weather, settling or impacts. Once a concrete surface becomes worn or damaged, you must perform repairs to stop the damage from spreading before the concrete must be removed and replaced

Which is the Best Thinset to use: Infographic DIYTileGu

  1. I am often asked what type of thinset should be used? So to answer this question you first need to know what kind of tile is being installed and on what kind..
  2. Thinset is a stronger material than mastic, making it a better choice for horizontal applications such as flooring that get a lot of pounding. Dry-mix thinset is inexpensive and easy to use
  3. Thinset mortar is a type of cement used for the adherence of tiles and flooring to substrate, or subfloor materials. Tile installation requires grooves in the thinset to create air pockets which facilitate the adhesion of the tile
  4. In this video, Tim Carter, of Ask the Builder, shows you how to install tile on a concrete floor. As Carter explains, you want to use thinnest to apply the tile. But before you do, be sure to clean the concrete first with a wet sponge. A lot of floor installers don't do this, and the floor is still dusty when they put the thinnest down. This can create problems later
Can You Use Thinset Mortar To Level Floor - Home Alqu

Thinset on Concrete - YouTub

Types of thinset. First let's look at what each type of thinset is composed of and how the Tile Council of North America (TCNA) describes the two types. According to the TCNA, dry-set mortar is Portland cement mixed with sand and additives that impart water-retentivity, and it's used as a bond coat for setting tile The type of thin-set mortar used to install DITRA depends on the substrate material. For example, to set DITRA over plywood or OSB, a modified thin-set mortar meeting the requirements of ANSI A118.11 is used. To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.1 The 50 lbs. Porcelain Tile Mortar is formulated for installations over concrete and backerboard. This mortar is designed for use with tile over 12 in. x 12 in. Superior bonding of porcelain to concrete, backerboard and cement self-leveling underlayment. Excellent for glass tile and radiant heating system installations Use for interior or exterio

What You Need to Know About Thinset or Mortar - Tile

On the bright side, there are some options for concrete subfloors. One of which is self-leveling underlayment and other floor flattening products. The other is foam backer board which is OK to install over concrete. This can be beneficial if you are wanting to insulate concrete from an electric floor heating system above it If you have an uneven or non-level floor, the tile floor will also be uneven, which leads to safety concerns For a concrete floor, use a thin-set mortar to level it. For a standard wooden floor, you can either build up for uneven floors, or you can add thinset. If you do add thin-set, then add a thin layer that is no thicker than 3 inches If you need to grind thin-set from the floor of a small room, say 80-100 sqft., then using a diamond disc on an angle grinder will work beautifully and the project should only take a couple of days and cost you a measly $40 plus a replacement shop vac filter. Otherwise, hire a pro or at least rent the appropriate tools if you can afford them

When to Use Modified or Unmodified Thinse

Mapei UltraFlex-1 White Mortar is a 50lb. bag of standard-grade, single-component, polymer-modified thin-set mortar for most interior and exterior installations of tile. This mortar has an above average content of unique dry polymer, resulting in good adhesion to the substrate and tile. FEATURES AND BENEFITS Similarly, you may ask, do you have to use backer board when tiling a floor? On a plywood subfloor, you need either a layer of cement backer board or an underlayment membrane, like Custom Building Products' Wonderboard and RedGard, between the subfloor and tile for the thin-set adhesive to achieve a good bond. Can I just screw down cement board

The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. For example, a 3/8″ notch trowel will produce a 3/16th inch thick coating after the tiles are pressed in to the cement Use a modified thinset mortar as recommended by the CBU manufacturer. The Ultraflex 2 qualifies. Skip the RedGard on the CBU joints next time. Serves no useful purpose at all if you have a moisture barrier behind the wallboard

A Trade Pro's Guide to Thinset vs

The next tip is to use a crack isolation membrane between the concrete floor and you ceramic tile. If you are matching the height of an existing tile floor, this might not be possible. Next, apply a layer of thinset down on the concrete. The thinset, when cured, will have a very hard surface for the ceramic tile The suspended concrete floor must be a minimum of 6 thick. The cork must be of the proper density (11.8 to 13.6 pounds/cubic foot) and must be 1/2 thick. The thinset mortar and grout must be recommended by the manufacturer for above ground use. I know of no restrictions for use of cork as a floor underlayment in humid areas

How to Remove Thinset from Concrete: Simple Methods That

Use a polymer modified thin-set mortar that meets at least ANSI A118.4 or A118.15 that is recommended for submerged applications. Laticrete, Mapei, Custom and others produce this type of thin-set. Most installations use a polymer modified cementitious grout. Some will use an epoxy grout that is more difficult to clean up if you don't have the. The thinset on the floor. Since I'm putting down new, large-sized floor tiles, getting the old tiles off was just the first step. To prevent the tiles from cracking, the floor also needs to be level. After the old tiles were removed, there were still large areas of thinset stuck to the concrete that were obviously not level The grout popped up and water got underneath the tile. So, I read the back of the pre-mix thin-set label, and of course, it says to not use on floors and areas with heavy water immersion. Upcoming third attempt: This time, I am determined to get the floor even and avoid pools of water If you have a good bit of bare, clean concrete the thinset should stick. The problem on a floor is there is probably a really thin layer of glue over the concrete between the notches of the trowel they used. If you're not in a hurry I'd put thinset down on a test area and let it harden. See how hard it is to remove the test thinset and. There are a few main ways to safely remove thinset without damaging any surfaces, and the best method for you to use will depend on what type of surface you used the thinset on. Delicate surfaces, like kitchen walls and wood floors, will require using an angle grinder to gently scrape away the thinset

The following is the criteria for the proper construction of interior tiled plywood floors: The total plywood thickness must be a minimum of 1 1/4 (32mm) thick. The subfloor (bottom layer) must be tongue and groove. Either 3/4 (19mm) thick or 5/8 (16mm). For the 3/4 (19mm) subfloor, use a minimum of 1/2 (12mm) underlayment It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. However, unmodified. It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. However, unmodified You can use an 8-foot level to check it; in the case that the floor is not level, you can and should use a leveling compound that will make the concrete level. Make sure that the compound dries completely. Purchase a level on Amazon. Step 3 - Use Thinset. Use the thinset over the concrete base and spread it evenly. You can use a trowel with. Coverage will vary depending on trowel notch size, type and size of tile, and substrate. Mixing: Mixing: Place clean, potable water into a clean pail. Add Laticrete 253 Gold. Use approximately 5 qts (4.7 l) of water for 50 lbs (22.7 kg) of powder. Mix by hand or with a slow speed mixer to a smooth, trowelable consistency Randy: Putting thin set under the Durock is the best way to fill and stabilize the board. Use a 1/4 notched trowel,spread on the sub floor, place the Durock down and take a rubber hammer and tapping the board several times to fill any low areas of the plywood. Do this and you will not have any gaps between the Durock and plywood

Why Is Thinset So Hard to Remove? It can be challenging to remove a stuck floor that is glued to a concrete or plywood sub-floor. Vinyl tiles and sheet vinyl, and some types of hardwood and carpet require the use of an adhesive. Remove the flooring with a floor-scraping tool There are many types of floor tile, ranging from ceramics to clay to natural stone, and most can be successfully Tile mastic, or thinset, is a premixed adhesive that is easy to use right out of the can, and it If you tile on plywood, a double layer of plywood with overlapped seams is recommended

How to Choose the Correct Tile Adhesiv

Actually, not at all. We don't install flooring. We install the electric (low voltage or line) radiant system that is integral. The design is up to someone else but in all of the installations where we have installed a cable (exclusively), solidly 1/2 are on plywood and the rest is on concrete/backer or some other type where a mortar, thinset or SLC is applied after we're in place thinset noun: (also called thinset mortar, thinset cement, dryset mortar, or drybond mortar) an adhesive mortar made of cement, fine sand and a water retaining agent such as an alkyl derivative of cellulose. It is usually used to attach tile or stone to surfaces such as cement or concrete. Image: Travertine Floor Tiled Hallway from Arizona Tile

MAPEI Ceramic 50-lb White Thinset Mortar Tile Mortar. Item # 12949 Model # 10750136. Get Pricing and Availability. Use Current Location. Check Other Stores closed. For use with ceramic and most natural stone. Ideal for small tiles with all sides 15 inches or less. Mix with water - no additive required KSEIBI 644030 4-1/2-Inch Double Row Diamond Cup Grinding Wheel Gold for Angle Grinder Polishing and Cleaning Stone Cement Marble Rock Granite Concrete Surface Grinding. 4.6 out of 5 stars. 572. $19.48. $19.48. 4-in Wide THINSET REMOVAL BIT, Floor Scraper, SDS Plus!!! (4 X 10) 4.3 out of 5 stars. 316. $59.99 Option B: QUIKRETE Concrete Patching Compound (Use for non-structural, small aesthetic repairs to concrete; should only be applied when temperatures are between 50 and 90 degrees.) Step 4b Stir Concrete Patching Compound using a margin trowel or putty knife. Step 5b Spread and texture the concrete patch to match the surrounding concrete The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. For example, a 3/8' notch trowel will produce a 3/16th inch thick coating after the tiles are pressed in to the cement

How to Use Thinset Morter to Resurface Concrete Home

Merkrete 703 Thin Set is a professional grade polymer modified Portland . cement thin set mortar for installing porcelain, ceramic tile and natural stone. It is recommended for use in the thin set installation method for absorptive, semi-vitreous and vitreous tile over properly prepared masonry, concrete, and cement backer board If you don't have a moisture issue but have some smaller cracks on the slab (less than 1/8th of an inch), you can use a high-quality modified thinset (the mortar used to attach the tile) that has.

Thinset mortar is what you need to use for shower walls and floors of any type. It is sold in bags and needs to be mixed with water. Sound simple? It is. Referred to as thinset, mud, mortar, or a number of other things, it is a combination of sand, portland cement, lime, and other stuff that makes it the preferred setting material for elves. What is Thinset Mortar? Thinset is an adhesive cement used to secure floor and wall tiles to concrete surfaces. The word thinset is sometimes used interchangeably with mortar, because it's a type of modified mortar made specifically for tile. Thinset is made of sand, water, and cement, and can also contain additives for increased bonding, water resistance, and flexibility How to tile a concrete floor. Spread thin-set again on a small surface and lay the next tiles in the same manner described above. Work with patience and tap the tiles to lock them into position. Making sure the tile flooring is level. Use the level to check the alignment of the tile flooring

What Type of Thinset Should You Use for Porcelain Tile

  1. Custom Building Products' Marble, Granite and Travertine Premium Medium Bed Mortar is specifically suited for installing larger stone tile, including travertine. Because of its medium-bed properties, it is a good choice for installation where the bed (amount) of thin-set mortar exceeds a traditional, thin, notched-trowel stone application
  2. MongoCT. An unmodified thinset (Masterblend) is fine between the Hardi and the subfloor. The reason for the layer of thinset between the cement board and the subfloor is to fill the voids/gaps between the two. It'll keep the cement board from moving up and down. That long term flexing can lead to problems down the road
  3. Help! I Spilled Vinegar on my Concrete Floor. Knowing that acids can react with cement to dissolve and gradually degrade the structure of concrete, you might be terrified that spilling a little vinegar on your polished concrete kitchen floor will result in a gaping hole. But don't panic just yet. Remember that vinegar is weak, dilute acid
  4. MAPEI Large-Format Floor Tile 50-lb Gray Thinset Medium Bed Thinset Tile Mortar Item # 1103731 Model # 2184323 Good adhesion for ceramic, porcelain and natural stone tiles with one or more sides greater than 15-i
  5. imum 1/4 x 1/4 notch trowel, will then provide a ribbed bed into which the wedi Building Panels will be laid
  6. Grey Bathroom Tiles How To Lay Tiles On A Concrete Floor Mortar Manual Mortars Manual - Free ebook download as PDF File (.pdf), Text File (.txt) or read book online for free. Military manual for the use of the 81mm mortar. by GasMaskBob in Types > Instruction manuals, explosives, and guide porcelain tiles india qep 10630q 24-inch manua

If I use a self-leveler on my plywood subfloor, which type of thin-set mortar do I use to install Schluter™-DITRA or DITRA-XL? We recommend Schluter SET™ , ALL-SET™ , FAST-SET™, or unmodified thin-set mortar on a floor that has been leveled with a self-leveling product The water can be coming up from under the concrete from the soil if there is a high water table or if water is draining towards the house. If you have cracks in the concrete floor that you want to tile and the cracks have a lot of efflorescence staining then you might need to install a waterproof membrane first or a waterproof mitigation system

When installing a ceramic tile floor on a concrete subfloor, you don't have to worry about flexing as long as the concrete slab is at least 1 1/8-inch thick, which most slabs are. However, you're not out of the woods: Concrete expands and contracts, and that type of movement can also crack the tiles and the grout For cutting concrete, you should make use of a diamond blade that can be used for both wet and dry cutting of concrete. A diamond blade is an exceedingly versatile asset to have at your disposal as it can slice and dice everything from stone to granite, brickwork, and even tile The floor is a 4 inch poured concrete slab over an unheated utility room. The house was built in the late fifties and the slab floor has been painted at least once. I can tell you from working in. Stick a thin marble or pavers to the concrete with the mudset method; Installing pavers over concrete in sand; Sticking tile to concrete with thinset. This method of installation is similar to setting any interior floor tile. An adhesive mortar (made of cement and fine sand) is used to attach the tile to the concrete. The difference is the tile. A sound surface is necessary when preparing concrete floor for tile installation. Cracks and depressions may create weak spots that cause tile to crack in the future. Patch little cracks or holes with a cement patching compound. Use a trowel to apply and use the edge to ensure the patch has edges level with the surrounding concrete

The ultimate, lightweight one-step, polymer fortified, Large and Heavy Tile mortar for interior and exterior installation of ceramic tile, porcelain tile, glass tile, stone, quarry tile, pavers and brick. MULTIMAX LITE features maximum non-sag performance on walls and maximum buildup of up to ¾ (19 mm) without shrinkage on floors A concrete floor is a good base for laying ceramic tiles, provided it is level and free of cracks or abrasions. Self-leveling compound can be purchased at your local home improvement store and applied to the concrete floor prior to tiling Research tile and find out what type and size fits your needs. Tile must be installed on at least one and a half inch of sub floor; or you can use a concrete backer board.(thinset backer board to floor and screw off or roofing nail it). Measure square footage and purchase an extra box for mistakes Be sure the thinset is thick and sticky, with a peanut butter like consistency. Ultraflex II may be used as a thinset. It is better to use a non-sanded grout. It is a good idea to pre-seal the tile to avoid potential staining with mortar. When the installation is complete, seal the tile with the appropriate type of sealer Whether you use modified or unmodified thinset, the strength depends on the cement ratio to sand within the mix. A high-quality thinset will have more cement than sand, which makes it sturdier and provides more adhesion. They both are applied in a similar way. Whether you use unmodified or modified thinset, the application is roughly the same

Designed to provide superior bonding of porcelain tile to concrete surfaces, backerboards and self-leveling underlayment. Polymer-modified Porcelain Tile Fortified Thin-Set Mortar can also be used with radiant heating system installations. Use it for interior or exterior floors, walls or countertops Epoxy grout (meeting ANSI A118.3) is quite different from cementitious grout and epoxy emulsion grout. Made from epoxy resins and a filler powder, the grout is extremely hard, durable, and nearly stain proof. Often times the bond between tiles is stronger than the tile itself. You might wonder why this type of grout is not used all the time Full Member. Feb 5, 2009, 05:24 AM. Any gray modified thinset will work if the slate is all relatively uniform in thickness. For slate with lots of thickness variation, use a medium bed mortar so you can make the needed adjustments in the thickness of the thinset below without the slate slumping as you move along I'm putting tile in the kitchen and removed the old linoleum. The concrete is very smooth and I can't get thinset to stick. Can I use a acid or do I have to grind. I have tried a modified thinset and acrylpro. The acrylpro sucked and I had to pull up all the tile and clean it, that stuff did not dry after 4 days, then I tried the modified and it sticks to the tile but not the slab If you plan on leveling a concrete floor, you can do so with relative ease by using a leveling compound. It spreads across uneven slabs, filling in low spots as it creates a new, level surface

Removing Thinset From Concrete Slab. Thinset is sometimes referred to as mortar because it is used to secure tiles to a floor or wall. It is made of cement and forms a durable connection to the tile when dry. This can be a challenge if you decide to remove the tile, since most of the time the thinset remains stuck the floor. To remove thinset. If this added underlayment is a wood product, i would use PL Premium running beads about 6 OC and screw it off at same layout. You only need to use thinset is your new underlayment is a cement based product like a hardiboard. normal unmodified thinset cures like concrete by a chemical process After the cracks have appeared on the thinset, use chisels or a floor scraper to get rid of the thinset. 4. Using A Chemical Mastic Remover. You can buy a chemical mastic remover from any online hardware store of physical shops. It will cost you around 100$ for a bucket which measures 5 gallons of chemical mastic remover. Prefer a mastic. Guide to Installing Tile Over Concrete Slabs. Tiles can be applied directly to a clean, smooth concrete slab with a latex Portland cement mortar. The concrete should be properly cured, be level to 1/4 inch in 10 feet, and have a steel trowel or fine broom finish Tile set by the thinset method is adhered to the substrate with a thin layer of thinset cement. The terms thinset cement, thinset mortar, dryset mortar and drybond mortar are synonymous. This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick

5. Lay the tile in thin-set Set the tiles using the same latex-modified thin-set and techniques used for the cement board. Only mix as much thin-set as you can use in a half hour and be sure to have solid support under each tile. If you follow all these steps, you'll have a stiff, monolithic, crack-free floor. Additional Informatio Add 5.5 quarts of water for each 55-pound bag of Thin Finish. Mix the concrete in clean five gallon buckets using the paint mixer. Adding color during this step will provide a base color for the next acid stain step. The amount of color depends on the depth wanted, so check with the manufacturer for directions specific to your application Mapei Keraflor White Floor Tile Thin-Set Mortar. Size: 50 lbs. SKU: 100215458. Mapei. $7.47 /piece. Richmond's everyday low price! Richmond's everyday low price! View Details Mapei Keraflor White Floor Tile Thin-Set Mortar. Compare 9d07f67d193e2d158ad06a0aae

Modified thinset mortars aren't recommended for use with Kerdi because they must dry out to gain strength, whereas the membrane inhibits drying, which can lead to unpredictable results. For example, if a shower is used before the mortar has cured properly, leaks and polymer leaching can occur. Unmodified thinset mortars, on the other hand. ARDEX is committed to matching the right products with your next installation to minimize time, cost and risk at every job site. With the unparalleled support of technical and field experts, we provide on-site product know-how and job site consultation expertise to architects, building engineers, construction managers, general and specialist. Thinset - Thinset is a cementitious product that requires water to create a chemical reaction much like concrete. Thinset is much stronger structurally than mastic and a waterproof product that will not lose strength when exposed to water. Thinset is the only product that I recommend be used in showers, bathrooms and even floors

Different types of thinset is used for different applications including outdoors. Consult the thinset manufacturer for the right thinset for your job. Only mix up enough thinset as you can easily use before it begins to cure. Mix up smaller batches at first until you begin to see how much you can use at one time After resurfacing and sealing. If the existing floor covering in a bad shape, it must be removed before installing new flooring.Asphalt-based cutback adhesive remaining on a concrete floor after removing old vinyl tile and other flooring represents one of the most difficult and risky subfloors for the installation of new flooring

Decorative Concrete Floor – Perth Concrete Resurfacing

Thinset. Thinset is a different type of mortar made from Portland cement and an adhesive product. This type of cement is better suited for tile installation on top of a cement base. Use this when installing tiles in your bathroom on your cement shower base Remember: if you're planning on tiling your shower's floor, don't use mastic or premixed thinset. Can mortar be used as Thinset? To make things clear for you: the term thinset describes a specific type of mortar (mostly unmodified) that is used for gluing tiles to walls (like shower wall tiles, for example) Attaching a wooden threshold to a concrete floor. I volunteered to build a custom threshold for a local charity. Doorway is 900mm wide steel frame with terrazzo on one side and a click lock oak floor on the other. The terrazzo is 19mm deep, the click lock floor is 13mm deep and the span between the two is concrete and 150mm wide Step Three - Chipping Hammer with Scraper. Some Thinset mortar can be removed by using a chipping hammer with a scraper attachment. Use short jabbing motions to get under the mortar and pop it from the floor. But, if the mortar is stubborn, you may have to go directly to the big tools Nothing has changed with the type of thinset you should use with Kerdi or Ditra. As mentioned, use the appropriate mortar for the substrate, and use a high quality unmodified to bond all tiles to them. (except glass as mentioned). With Kerdi, you're gonna be using unmod under and above most of the time because of the substrates

What will Thinset adhere to? - AskingLot

Video: Mastic vs Thinset - Which should I use? — TileTool

How to spread tile adhesive | HowToSpecialist - How toHigh Quality Porcelain Tile Mortars | Custom Building Products

paddle-type mortar mixer. MACHINE MIXING QUIKRETE® Floor Mud can be mixed in a barrel type concrete mixer or a mortar mixer. Choose the mixer size most appropriate for the size of the job. Allow at least 1 cu ft (28 L) of mixer capacity for each 80 lb (36.2 kg) bag of QUIKRETE® Floor Mud to be mixed at one tim For the fiberglass mesh tape be sure to use the special, heavier type sold for use with thin-set mortar, as regular drywall mesh tape will rot. The thin-set is a cement-based powder that you mix with water or latex additive to form a thick paste, which is used to seal the seams in the board and can also be used to set the tile The plywood subfloor should be at least 5/8 thick on 16 centers (3/4″ preferred) and securely attached to the joists preferably with screws. Layout the cement backer board at right angles to the plywood subfloor so the joints in the backer board are staggered and don't fall on joints in the plywood. Leave a 1/4″ gap between the. Ardex X3 Tile and Stone Gray Thinset Mortar - 40 lbs. Item #012523. ARDEX X 3 Tile and Stone Mortar is a Portland cement-based, polymer-modified mortar with good bond strength and sag resistance and a 3-hour pot life. ARDEX X 3 mixes to a creamy, easy to apply thin set mortar that is water and weather resistant If you thinset the tape (like you would during a normal sheetrock install) then apply more thinset and rake out you'll avoid the humps and bumps. As for the intersection of the Durock and greenboard, use normal joint compound in the green or blue bucket. Remember, that area will probably be painted and thinset doesn't finish very well :