- The almost self-levelling system flow mortar or thin screed can be laid universally indoors in layers of 10 to 40 mm thick as a level surface. It is therefore suitable for use as a component of thin-layer floor renovation systems.
- Furthermore, the thin screed can be used as heated screed on underfloor heating and in domestic bathrooms.
CERAfix 222 is designed to be used as a system flow mortar or thin screed on all common types of flooring. The thin screed can also be used on underfloor heating. The thin screed can also be laid in domestic wet rooms (if a water-blocking system is installed and all the edges are sealed). Floating screed must not be permanently exposed to moisture and must not be used in commercial wet rooms.
- Ambient temperature and substrate temperature during application and drying: 5-30°C
- Due to their instability when subjected to alkaline environments, bare aluminium profiles must not be used as a substrate.
- Protect from the elements (cold, frost, heat, direct sunlight, humidity, rain, wind, draughts etc.) until fully dry.
The screeds should be placed on a moisture and vapour barrier (PE film or grey chip paper) to prevent (vaporous) moisture coming through from the substructure (especially in the case of fresh concrete surfaces, components to unheated rooms). In areas where moisture comes through from the substrate (e.g. basement), a seal in accordance with DIN 18533 must be installed.
If used as floating screed, approved insulation panels must be used for floor construction. These must be laid in the brick bond and tightly pushed together. The insulation must be protected against moisture using grey chip paper or PE film. On walls or rising components, an edge insulating strip 80/10 must be applied to form a watertight seal.
CERAfix 222 can be used in domestic bathrooms if a water-blocking system is installed and all edges are sealed. The screed must be dry before being covered (see technical data). Floating screed must not be permanently exposed to moisture and must not be used in commercial wet rooms. The flatness tolerance requirements of DIN 18202 must be observed. Before installing the screed, the substrate must be checked and prepared in accordance with DIN 18353.
The correct consistency is set at the start of the work by determining the slump. For this purpose, a PVC pipe (height 7.0 cm, internal diameter 9.4 cm) is filled with material on a PE film, pulled upwards and the slump measured.
Once the screed has been poured level, it must be tamped crosswise with a dapple bar or hard broom. This removes trapped air pockets and levels the screed material.
When used as heated screed, the material should be laid with the underfloor heating switched on at a max. flow temperature of 20°C.
The freshly laid screed must be able to dry out unimpeded and must not be exposed to excessive or permanent moisture. The room must not be used to store building materials or similar during the drying phase. During the first two days of drying out, the screed must be protected from the elements, e.g. draughts, direct sunlight, frost. While the screed is drying out, the temperature of the construction site must be at least +10°C. Intermittent ventilation (2-3 times a day for 15 minutes) from the third day and heating as necessary will speed up the drying process. Low temperatures, high humidity and installation thicknesses ≥ 50 mm will slow down the drying process. Condenser dryers can be used after seven days to make the concrete mature faster.
In the case of heated screed, a heating report must be drawn up by the heater manufacturer, whereby the flow temperature may not exceed +45°C. The screed on underfloor heating will only be guaranteed under warranty if there is a heating report in accordance with regulations. The heater manufacturer must hand this report to the construction site manager immediately once the floor has matured after heating.
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