There are several recommended surfaces such as: plywood, concrete, gypsum and cement backer units (CBUs). All require different preparation. For more information, see the technical document “Surface Preparation Requirements.”
The thin-set mortars recommended for waterproofing membranes are polymer-modified thin-set mortars. Do not use mastics such as Type 1 or Ultramastic ECO on waterproofing membranes.
No, this grout requires no sealer and cures naturally from evaporation of the low level of water in the formulation; in any event, sealants do not adhere well to Flexcolor CQ grout, due to its formulation.
Yes, if the existing substrate is in good condition, clean the surface with a degreaser such as our UltraCare Heavy-Duty Stone, Tile & Grout Cleaner, rinse and allow to dry.
Then, prime the surface with ECO Prim Grip before applying the mortar.
It is recommended to prime the surface of gypsum-based substrates with Primer T diluted at 2:1 (two parts water, one part primer) or ECO Prim Grip primer.
MAPEI recommends a polymer-modified thin-set mortar such as Keraflex RS under and over the membrane.
Be sure to carefully follow the water ratios and all other instructions listed on the products’ Technical Data Sheets.
It is the trowel used that will determine how much mortar is needed.
On average, a 1/4" x 1/4" x 1/4" (6 x 6 x 6 mm) square trowel covers 80-100 sq. ft. (7.43 - 9.29 m²) per per 50 lb. (22.7 kg) bag.
A 1/4" x 3/8" x 1/4" (6 x 10 x 6 mm) square trowel covers 60 to 80 sq. ft. (5.57 - 7.43 m²) per 50 lb. (22.7 kg) bag.
A 1/2" x 1/2" x 1/2" (12 x 12 x 12 mm) square trowel covers 40 to 50 sq. ft. (3.72 - 4.64 m²) per bag.
The amount may vary from one mortar to another. Consult the product calculator for tile mortars and adhesives on our website.
The size of the tile determines the choice of trowel. Large format tiles (where any side is larger than 15" [38.1 cm]) require a square-notch trowel with deeper notches like 1/2" x 1/2" x 1/2" (12 x 12 x 12 mm). Smaller sizes can be installed with a 1/4" x 1/4" x 1/4" (6 x 6 x 6 mm), or 1/4" x 3/8" x 1/4" (6 x 10 x 6 mm), square-notch trowel.
No; instead, use an appropriate MAPEI polymer-modified thin-set mortar that meets the requirements of ANSI A118.4 or ANSI A118.11, or an epoxy mortar that meets the requirements of ANSI A118.3.
Keep in touch
