![]() Wait a minimum of twenty (20) hours before dry-set mortar may be applied to the mortar bed. Surfaces such as these will prevent bonding and should be covered with a cleavage membrane topped with a 3/8 inch to ¾ inch (9.5 to 19.1 mm) reinforced mortar bed for floors. Do not use over vinyl, particleboard, luan plywood, gypsum-based underlayments, wall coverings, adhesive residue, masonite, metal, glass, plastic, or painted surfaces. For use over existing ceramic tile, scarify surface of tile via mechanical abrasion with a Carborundum disk followed by a clear water wash. Alternate Surfaces: To bond over existing ceramic tile, marble, vinyl, VCT, and resilient flooring, floors must be bonded well to its subfloor and free of any wax, oil, dust, or paint particles.All plywood shall be an exterior grade (for interior, residential, and light commercial use in dry areas only), free of dust, oil, or other foreign matter. ![]() Plywood and Wooden Substrates: All plywood floors (including subfloors) shall be engineered to meet all ANSI requirements.When used to install tile in any submerged application (swimming pools, spas, water features, et cetera) allow mortar to cure a minimum of seven (7) to fourteen (14) days before exposure to water. For hot and dry conditions, lightly dampen the surface with water leaving no standing water. Smooth concrete should also be roughened to ensure a mechanical bond. Test again to ensure that water is absorbed into the substrate before proceeding with the installation. If water beads up and does not absorb into the substrate, scarify surface via mechanical abrasion with a Carborundum disk followed by a clear water wash. Test to confirm that concrete can absorb water by sprinkling water droplets. Concrete shall be free of any efflorescence and hydrostatic pressure. Surfaces may be cleaned with sulfamic acid ( SGM Safe Clean Crystals) then thoroughly flushed and neutralized. Remove any liquid curing agents or concrete sealers, followed by a clear water wash. The slab should have a steel trowel or broom swept finish. Concrete and Plaster surfaces: All areas should be twenty-eight (28) days cured and shall be structurally sound, clean, and free of any moisture, wax, oil, paint particles, curing agents, or foreign matter.
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