Kestonit Optio

Self-levelling floor screed 3-20 mm

Self-levelling universal floor levelling compound. Also suitable for levelling floors to be covered with paint. Suitable for pump application. With low alkalinity. Cement based.

Special features

  •  can be levelled to form a ready adhesion surface
  • walkable after 5 hours
  • on layers up to 10 mm flooring can be laid after 24 hours. On layers
    up to 20 mm flooring can be laid after 3 days at normal room
  • adheres to concrete, wood and various construction plates (Note the
    correct priming)
  • extremely good self-levelling properties
  • practically non-shrinking
  • moisture resistant
  •  lowest application temperature +10°C
  • casein-free
  •  pumpable
Suitable for levelling floor surfaces in 3-20 mm thick coatings before laying the floor covering. For levellings over 20 mm we recommend Kestonit Termo or Kestonit Rapid levelling screed. Kestonit Optio is not recommended for smoothing the subfloor for mosaic parquet.
The subfloor must be clean, firm and strong. Remove the so-called cement skin and paint splashings, and brush or vacuum the subfloor thoroughly. Rough uneven areas and high ridges must be sanded before levelling. When working with concrete floors, prime the surface with Kiilto Start Primer thinned with water (10-20 % of primer, 80-90 % of water). Surfaces under reconstruction as well as wooden or board surfaces shall be primed with Kiilto Start Primer before levelling. If necessary special alkaliresistant fibreglass mesh can be used.
Add the floor screed powder gradually to cool, clean water, stirring simultaneously until a smooth, plastic mix is formed. Let the mix settle for about 5 minutes, then stir once more thoroughly. Apply smooth screed by pouring it as wide stripes on the floor. Levelling can be improved with a wide steel trowel. Screed can be spread also by floor screed pump. The drying of the coating must not be quickened by heating or ventilating, as too fast drying may cause hair cracks. If the temperature in the treated room is higher than normal, the relative humidity very low, or if the leveled floor surface is exposed to direct sunlight, we recommend that the  floor is covered with a tarpaulin as soon as it is dry enough to allow walking. The floor should be covered relatively soon after the hardening and drying of the floor levelling. Thus the overdrying of the surface is avoided and the risk of the cracks and weak bond is eliminated. Suitable also for floors in secondary, light loaded rooms that will be painted, but not for example under the paint of the floors of garages or bathrooms
etc. For the rooms, where water isolation is used, floor levellings should be applied under the watertight membrane. Not recommended for areas permanently under water (e.g. swimming pools).


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