The substrate must be flat, clean, dry, adequately load bearing and free from material which may prevent bond of the adhesive. The tile adhesive must bond to the substrate, and anchor me-chanically to the fabric on the underside of the decoupling membrane. The type of bonding adhesive used to apply the decoupling membrane depends on the type of substrate. For most substrates, a premium modified thin set mortar is recommended (c2 quality). However please consult your adhesive supplier. Apply the tile adhesive to the substrate using a ¼” x ¼” (6 x 6mm) square notched trowel. Estimated coverage is 100-120 sq ft per 50lb (22.7kg) bag of mor-tar.