CR 62 adheres to all solid, load-bearing, clean, dry and damp surfaces free of substances which can cause separation. The surface must be rough, open-pored and have a good key. Existing coats and old, damaged plasters must be completely removed up to at least 80 cm above the visible area of moisture penetration or efflorescence and down to the bearing wall material. Scrape brittle mortar joints to a depth of approx. 20 mm. Prewet brickwork and concrete so that the surface is no longer absorbent and has a matt damp appearance. Prepare pneumatic mortar of a suitable consistency using CR 62 mixed with CC 81 and water (mixing ratio: CC 81 : water = 1 : 3) and throw onto the wall. Apply the mortar in a net-like pattern with only 50 % coverage. With mixed brickwork, porous bricks and sand-lime bricks apply the mortar with at least 5 mm layer thickness.