Custom Marble & Granite Premium Mortar is formulated for installing gauged or ungauged natural stone, tile 12" x 12" (30 x 30 cm) or larger, clay pavers, or any installation requiring a medium bed mortar. Its non-slumping formula eliminates lippage saving time and labor by minimizing the need for leveling tile. Excellent sag and slip resistance, wall tiles are held in place immediately.
Installation to conform to ANSI A108.5. When installing irregularly backed natural stone, pavers or large tile, use a 1/2" x 1/2" x 1/2" (13 x 13 x 13 mm) square-notch or 3/4" x 9/16" x 3/8" (19 x 14 x 9.5 mm) U-notch trowel. For all other installations use a 1/4" x 3/8" x 1/4" (6 x 9.5 x 6 mm) square-notch trowel. Using flat side of trowel, apply skim coat of mortar. Apply additional mortar with notched side of trowel held at a 45° angle to the surface, combing in one direction.
Press tile firmly into place in a perpendicular motion across ridges, moving back and forth. Perpendicular pressing flattens ridges and closes valleys allowing maximum coverage. With some tile, back buttering is advisable. Adjust tile promptly and beat in with block and rubber mallet. Periodically pull up a tile and check the back to ensure complete coverage with the mortar. Do not spread more material than can be tiled in 15 minutes, or while material has wet tack (sticky to the touch). If material has skinned over (not sticky), recomb with notched trowel, if too dry, remove and replace with fresh material. Material in bucket will remain workable in excess of 2 hours.