What type of mortar do I use for Ditra?

By: Thurman Schinner

To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.
Can you use modified mortar on DITRA?
Since DITRA is impervious, it does not deprive the mortar of its moisture. 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.
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.
Will modified thinset stick to DITRA?
While the membrane?s fleece IS bonded to the substrate, thinset does NOT stick to Ditra, and there are voids between the pillars that hold the tile up which means that if a lateral stress is applied, the whole tile and thinset layer can move totally independently of the subfloor or slab only restricted by the

What mortar do I need to use for the Schluter heated floor system?
Schluter-Systems requires the use of Schluter SET?, ALL-SET?, FAST-SET?, or an unmodified thin-set mortar meeting the requirements of ANSI A118. 1 to install ceramic (including porcelain) and stone tile over DITRA-HEAT.
Is there a difference between thinset and mortar?
What is Thinset Mortar? 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.
What is the difference between modified and unmodified thinset mortar?
Unmodified thinset has been around forever. Unlike unmodified mortar, which consists only of a blend of Portland cement, sand, and water retention agents, modified thinset includes additional retention products, such as latex polymers, which can increase its performance and strength.
What size trowel do you use for DITRA?
For DITRA use a 1/4? x 3/16? (6 mm x 5 mm) V-notched trowel, 5/16? x 5/16? (8 mm x 8 mm) V-notched trowel, or the DITRA trowel, which features an 11/64? x 11/64? (4.5 mm x 4.5 mm) square-notched design, is recommended.
Can I use Versabond with DITRA?
They only sell modified thinset. So fine, use Versabond to install Ditra to plywood.
Will unmodified thinset bond to plywood?
Thinset is the wet base that you first trowel on the plywood to make the tile stick. Higher latex content is essential for bonding to plywood. A quality unmodified thinset should be used and mixed with a latex additive. 6
Which Mapei mortar is unmodified?
Keraflor: The ?economy? level unmodified from Mapei.
How long does Ditra need to 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.
Can I use Ditra over plywood?
Ditra should be installed on plywood subfloors using modified thinset mortar, not unmodified. Modified thinset mortar adds latex polymers to increase its adhesion and strength. This makes it work better with plywood. Unmodified is adequate for use on concrete floors.
Is uncoupling mortar the same as unmodified?
Uncoupling Membrane Mortar is an unmodified, dry set, medium bed mortar that was created for use with uncoupling membrane and waterproofing membrane.

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