What Thinset can you use on DITRA?

To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118. 1.

Is kerabond T modified or unmodified?





unmodified thinset

Kerabond is classified as the company’s premium unmodified thinset so it is well worth the investment.

Can you use modified thinset with Ditra heat?

The Schluter website says it is fine to use MODIFIED thinset to adhere the Ditra to the plywood subfloor, however they specify UNMODIFIED thinset to adhere the tiles to the Ditra.

What happens if you use modified thinset on DITRA?

Since DITRA is impervious, it does not deprive the mortar of its moisture. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. In general, we don’t recommend the use of modified thin-set mortar to set tile over the membranes because these mortars must air dry to cure properly.

How do you use thinset over DITRA?





First, mix the unmodified thin-set and spread it over the Ditra mat. Use the flat end of a trowel to fill the gaps or the cavities on the Ditra mat. Use a notched trowel to make even rows of thin-set on the Ditra mat. It would be best if you then put the mortar on the back of the tile.

How long should DITRA dry before tiling?

After about 24 hours, it’ll be ready for tile, and meanwhile Jim and Rich are getting started on the over half.

What is kerabond T used for?

Kerabond T is a premium-grade, non-sag, nonslump mortar for use in thin-set and large-and-heavy-tile (formerly known as “medium-bed”) applications in interior/exterior residential and commercial floors and walls when mixed with water.

How do you mix kerabond?

2.1 Into a clean mixing container:



(2,84 L) of cold water or 1 U.S. gal. (3,79 L) of Keralastic™. Gradually add 25 lbs. (11,3 kg) of Kerabond powder while slowly mixing.

Where is kerabond used?

Kerabond is a premium-grade, dry-set mortar for use in interior/exterior residential and commercial floor and wall applications when mixed with water. Installation of most ceramic tile, quarry tile, pavers and Saltillo tile • To set cement backer units (CBUs), see manufacturer’s installation guidelines.

What is modified thinset used for?

Modified thinset is the product of choice for most tile installations because of its increased strength and bonding with minimal shrinkage, which means a reduced chance of cracks forming in the tile. WarmlyYours Radiant Heating recommends modified thinset mortar for nearly all tile and stone installations.

What’s the difference between unmodified and modified thinset?



What is the difference between modified and unmodified thin-set mortar? Dry-set mortar is comprised mostly of cement, sand, and a water retention agent, and is also called unmodified mortar. Modified mortar contains a polymer which can improve the bond strength and add other properties.

Is Bostik Ditra set modified or unmodified?

Bostik Ditra-set

One company got the great idea to market to the Schluter faithful and came out with a product called Ditra-set. This was (is) an unmodified LFT mortar that can be used to install Schluter products.

Can I use modified thinset under Kerdi?

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.

How do you mix Bostik Ditra sets?



Using a slow speed mixer (<150 rpm), mix 5 to 6 quarts of clean potable water, Bostik 425™ Multi-Purpose Acrylic Admixture, or Bostik Flex- A-Lastic® Admixture to 50 lbs. of Bostik Ditra-Set™. Mix to creamy consistency. Do not re-temper by adding more liquid.

Can I use Schluter all set for Kerdi band?

Schluter ALL-SET® is suitable for use with ceramic, porcelain, and stone tile, including large and heavy tile, in conjunction with Schluter®-Systems’ uncoupling and waterproofing membranes (e.g., DITRA, DITRA-HEAT, KERDI, etc.), the Schluter®-Shower System, and KERDI-BOARD.

How thick should Thinset be under DITRA?

In most installations, a layer of thinset 3/16 to 1/8-inch thick is sufficient. Too much thinset creates a mess and inhibits proper bonding between the tile and the substrate.

Which Mapei Thinset is unmodified?

Keraset: This is Mapei’s mid-range unmodified.

Is Schluter Thinset good?



Overall the product is very good, if you mix it properly for your application. Not enough water, and it will set up on you way sooner than you’d think. I am in the middle of a major mast-bath re-tile job, placing both 12X12 Saltillo floor tiles and 2X2 mosaic. I have now used both the modified & unmodified.

How long does Schluter Thinset take to dry?

Wait 24 hours after the membrane installation is complete to allow for the final set of the mortar and to ensure waterproof performance of the assembly at seams and connections before water testing.

Can you put Schluter over drywall?

Yes. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower.