Mapei Keraflex Plus Mortar with Polymer

Keraflex Plus is a highly versatile, nonsag/nonslump, polymer-modified mortar built for large-format and heavy tile or stone in both vertical and horizontal applications. Formulated with Easy Glide Technology for smooth, creamy workability and excellent adhesion to substrate and tile.

High-Transfer Technology gives superior mortar-wetting properties for a strong, lasting bond — precise enough for demanding placement without sag or slump on walls. Ideal for use over uncoupling, crack-isolation, sound-reduction, and waterproofing membranes. Approved for floors, walls, and countertops in both residential and commercial installs, wet or dry areas.

If your tile has any side longer than 15", a large-format-tile mortar like this one is required over a standard thin-set. Works with both ceramic and porcelain tile.

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When do I need this instead of a standard thin-set? If any side of your tile is longer than 15", you need a large-format-tile mortar like Keraflex Plus instead of a standard thin-set.

Does the color affect performance? No — gray and white perform identically. White is typically used for light or translucent tile where mortar color could show through.

Can I use it over an uncoupling membrane? Yes — it's approved for use over uncoupling, crack-isolation, sound-reduction, and waterproofing membranes.

Is it suitable for wall installs? Yes — its nonsag/nonslump properties are built for precise vertical placement without the tile sliding before it sets.