Mixing
Mix with a concrete mixer for around ten minutes; two to three minutes are sufficient with a power mixer. Let stand for ten minutes, and mix again for a short while. When using an automatic mixer, ensure that the amount of water does not get too high.
Work instructions
The temperature of the base and air must be at least +5°C when applying coating and this temperature must be maintained for at least 3 days after coating. The most suitable conditions for coating are temperature of +10°C to +20°C and windless cloudy weather. Apply the plaster with a plaster trowel or a pump. A suitable thickness for one layer of filler is around 15 mm. If the layer thickness exceeds 20 mm, the filler must be applied in several layers so that the previous layer has had time to dry for one to two days before the next layer is applied. The filling plaster is levelled with a board. Also, careful wood rubbing to level the surface is possible. It is not recommended to do plastering in direct sunlight or in windy weather. Plastering nets mitigate the risk of cracking when mortar is drying. The net should be used especially at the connecting points of various materials, cracks in old brick walls, for reinforcing openings and corners, and plastering of various block surfaces (Siporex, lightweight gravel, concrete). The correct position of the net in the plaster is 1/3 of the surface, however at least halfway outside. In dry conditions, the base must be wetted before applying a new layer of plaster.
After treatment
Plastering must be protected with a plastic film or light spraying of water (the water must not flow) for at least one to three days. When the temperature is:
+20°C, protect the fresh plaster surface from rain and strong sunlight for one day
+10°C, protect the fresh plaster surface from rain for three days
+5°C, protect the fresh plaster surface from rain for seven days
Other considerations
- For pumping render mortars and vertical joint concretes with a maximum aggregate size of 3 or 4 mm, it is recommended to use a sufficiently powerful rendering pump with a minimum power output of 5.5 kW and a stator size suitable for 7 or 8 mm aggregates. The use of automatic mixing pumps is not recommended, as the mixing time in automatic systems is too short. This may negatively affect the solubility of the mortar admixtures and the performance properties of the mortar.
Storage and handling of waste
See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank