Schluter® SET Unmodified Mortar White

Schluter® SET Unmodified Mortar WhiteSchluter SET is the unmodified thin set mortar that Schluter specifically engineered for use with their membranes. When you're installing DITRA over a concrete slab or bonding tile to a DITRA DITRA HEAT membrane, this is what Schluter requires and using it is what keeps the warranty intact. Why unmodified matters: The "unmodified" classification means no polymer additives. Polymer modified mortars can create a slip plane in certain conditions when

so knots actually feel like knots and grain channels feel like real wood grain

installs over the full length of the drain channel

follow flooring manufacturer’s guidelines including moisture content and required moisture measuring methods

KERDI waterproofing membrane (any roll or width)

If it's in a corner

Single-plane slope means no diagonal tile cuts — tiles run straight and trim cleanly at the drain wall

Set the drain body BEFORE your mortar bed: Position the drain body at the rough-in

Slide the rubber gasket over the pipe/valve — it should fit with light resistance

Homeowners building a standard square shower

Pro Tip: The limewashed look came from centuries-old building practice — farmers would whitewash floors with diluted lime to kill bacteria and brighten dark spaces

This is the most common installation mistake we see

After a few years of hot showers