CERESIT CR 90 Crystaliser | Crystalline waterproofing mortar

SCOPE OF APPLICATION

- Building basements and basement walls

- Water tanks, including those for drinking water, up to a depth of 15 m

- Fire-fighting reservoirs

- Small monolithic swimming pools up to 20 m²

- Wastewater treatment plants

- Balconies and plinths

APPLICATION NOTE

Only on non-deformable substrates, with the following minimum requirements: concrete of class C 12/15 aged over 3 months, cement screed with a strength of over 12 MPa and aged over 28 days, or full-joint brickwork with a strength of over 6 MPa. For deformable substrates or underfloor heating, use CR 166, not CR 90. Corners must be rounded to a radius of at least 4 cm, edges chamfered to 3 cm, and eroded joints cleaned to a depth of 2 cm. Pre-wet the surface without leaving standing water.

The powder is mixed with cold water — 8 litres per bag for a brush, 6 litres for a trowel. First coat applied crosswise with a brush; second coat when the first has set but is still damp. Afterwards: keep damp for 24 hours, then leave in the sun for 3 days. Tiles can be laid after 3 days; the tank should not be filled to capacity until at least 5 days have passed.