Substrate: The surface to be covered with Ceramic tile shall be sound and confirm to good design, rigid, clean and free of dirt, oil, grease, curing compounds, form release agents or loose plaster and paint. For economy the surfaces should be level and true with in: Walls – 3mm in 2.5m Floors – 1.5mm in 1.0m Surface Preparation: All surfaces should be between 40° F(4°C) and 104° F(40°C) and structurally sound, clean and free of all dirt, oil, grease, loose peeling paint, laitance, concrete sealers or curing compounds.   Check the surface to be true to plumb. All slabs must be plumb and true to within ¼” (6mm) in 10 ft (3m). Rough or uneven concrete surfaces should be made smooth with LATICRETE^® Screed/Plaster material to provide a wood float (or better) finish. Dry, dusty concrete slabs or masonry should be dampened, and excess water swept off. Installation may be made on a damp surface. New concrete slabs shall be damp cured and 28* days old before application. *No minimum cure time for concrete slabs when thin-set mortar is mixed with latex additive. Expansion joints shall be provided through the tile work from all construction or expansion joints in the substrate. Do not cover expansion joints with thin set mortar. Follow ANSI specification A108.01 – 3.7 “Requirements for Movement Joints: Preparations by Other Trades” or TCNA detail EJ-171 “Movement Joints -Vertical & Horizontal”. Do not cover expansion joints with mortar. For tile installation over Cement Backer Board: follow TCA installation details W244. Mixing: Place clean, potable water into a clean mixing bowl. Add LATICRETE® 320 powder into the mixing bowl. Use approximately 6 – 6.5 Litres of water for 30 kg of powder. Mix by hand or with a slow speed mixer to a smooth, trowelable consistency. Allow adhesive to slake for 5-10 minutes. Adjust consistency if necessary. Remix and apply with the proper sized notched trowel. Areas of Application Designed especially for interior and exterior floor installations of all types of natural stones over concrete and on a variety of substrates. Good underwater shear bond allows this product to be used for wet areas like swimming pools, sauna, water bodies and wash rooms. Can be used for tile on tile applications, ceramic and vitrified tiles also. Suitable Substrates

• Concrete, Tremix concrete, VDF concrete
• Precast concrete
• Cement based screed
• Gypsum based screed
• Ceramic tile, Vitrified Tile and Natural Stone
• Cement Backer Board**
• Cement Terrazzo
• Existing natural stone or tile surface

**Consult the backer board manufacturer's data sheet for the specific recommendations and load bearing capacity of specific board intended for use.