CR 62 Renovating plaster
Special renovating plaster compliant with WTA standards for producing layers of 10 to 30 mm
- Negligible shrinkage
- For indoor and outdoor use
- Amount required: about 8.0 kg/m2 for each cm of plaster thickness
Ceresit CR 62 is used as a renovating plaster in order to produce dry surface of basement walls and facades. It is especially designed for the renovation of historical monuments or damp and saline walls. CR 62 may be applied on large surfaces and for minor repairs. It can be used for substrates with low, medium and high salinity. CR 62 with addition of Ceresit CC 81 contact emulsion may provide an “open work” scratch coat which will improve adhesion of the further layers.
Together with CR 61 and CR 64, it forms a special system designed for the renovation of old buildings.
Step By Step
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.
Sprinkle CR 62 into clean, clear water and stir until completely free of lumps. Always mix the complete sack with approx. 9.5 l of water. When mixing by hand, observe a mixing time of approx. 3 minutes, then mix again. It is possible to use plastering machines, in combination with a truck agitator. The consistency can be adjusted by carefully adding a few milliliters of water. Approx. 24 hours after apply-ing the pneumatic mortar, apply the plaster by machine or manually in a single layer of 20 to 30 mm thickness and smooth over. Scraped joints must first be filled with CR 62. For plaster repairs observe a minimum layer thickness of 20 mm. After smoothing the mortar, rub it over but do not felt finish. Make sure that no water or binding agent accumulates on the surface – danger of cracking. Do not work the surface too intensively or too long. If CR 62 is used for repair work and applied as levelling rendering, the plaster surface must be combed up with a stiff broom. Protect the fresh plaster against too rapid drying. If necessary, keep moist for 24 hours. After the plaster has hardened and thoroughly dried (after 28 days at the earliest), use only wall coverings or coatings which are highly capable of diffusion. For subsequent wallpapering we recommend to apply a 5 mm layer