Uncoupling Mat Mortar is a non-modified, all-purpose thin-set for Schluter-DITRA Uncoupling Membrane and other uncoupling systems. Adheres to most surfaces and types of tile. Provides good bond strength and performance when used in conjunction with Schluter-DITRA Uncoupling Membrane. Exceeds ANSI A118.1 when mixed with water. Mix with Thin-Set Mortar Admix when applying over Exterior Grade Plywood (EGP), existing flooring or exterior applications. For installations requiring increased flexibility and bond strengths, mix with Thin-Set Mortar Admix. Exceeds ANSI A118.4 and A118.11 when mixed with Thin-Set Mortar Admix. Use a non-modified thin-set mortar with Schluter-DITRA Uncoupling Mat per manufacturer's instructions.