USE

ARDEX D 20 is designed for fixing ceramic tiles and mosaics to various surfaces, including gypsum plaster, paper-faced plasterboards, concrete, cement and sand renders, stable cement-based sheets and boards, as well as other absorbent backgrounds. It can also be used to fix porous tiles onto existing ceramic tiling. It is suitable for dry internal areas, including domestic showers and bathrooms, on appropriate backgrounds where there is adequate time for the tiles to dry between uses.

PREPARATION

Ensure the substrate is sound, sufficiently mature, dry, and free of dust, dirt, oil, grease, or any other contaminants that could affect adhesion. Use a suitable degreaser to remove oil, wax, grease, and similar substances. Paint coatings, whitewash, and other friable materials must be removed before application.

APPLICATION

Apply ARDEX D 20 adhesive to the wall with a trowel, pressing the adhesive into the surface. Spread it evenly to create a uniform layer on the area to be tiled, then comb it with a notched trowel to form straight ribs. This creates an adhesive bed into which the ceramic tiles are set. For larger porcelain tiles (greater than 150mm x 150mm) or tiles with porous backs (greater than 300mm x 300mm), use the appropriate ARDEX cement-based adhesive.

GROUTING

Allow the ARDEX D 20 to set for a minimum of 24 hours before grouting. It is recommended to use an appropriate ARDEX-FLEX cement-based grout for general tiling. If tiling on impervious or non-porous backgrounds, wait up to 3 days before grouting. Movement joints should be installed as specified in BS 5385-1:

• Over existing and/or structural movement joints
• Where tiling meets other materials
• Where tiling spans different background materials
• In large tiled areas, at internal vertical corners, and at 3m to 4.5m centers, both horizontally and vertically
• In areas where stress concentration is likely, such as at changes in alignment

COVERAGE

Approximately 1 liter per m² using a 3mm x 3mm toothed and notched trowel.

PACKAGING

ARDEX D 20 is available in plastic tubs with a net volume of 10 liters.

STORAGE AND SHELF LIFE

Store in a cool, dry place away from direct sunlight and freezing conditions. ARDEX D 20 has a shelf life of at least 12 months when stored in its original, unopened containers.