Description
Kerakoll Levelflex External Levelling Compound is a rapid-setting fibre reinforced self levelling compound for external and submersible projects. Free flowing and highly workable.
Kerakoll Levelflex External is ideal for use in wet areas and swimming pools as part of the Kerakoll swimming pool system. Specially formulated to maintain performance whilst submerged, it is ideal for smoothing surfaces prior to tiling and can be left uncovered as a wearing surface.
Kerakoll Levelflex External Levelling Compound is for self-levelling correction of irregular and uneven substrates, in external and submerged installations, such as external patios and terraces, swimming pools and water features. It is rapid setting and drying and shrinkage compensated. Can be applied from 2 mm to 50 mm.
Kerakoll Levelflex External is compatible for use with gel adhesives, mineral adhesives, single and two-component organic mineral adhesives, reactive-epoxy and polyurethane, single and two-component cement-based adhesives, dispersed in water or solvent solutions.
It can be used with ceramic, porcelain, natural stone and mosaic tiles, and resins for industrial floors from the Kerakoll Factory range. Kerakoll Levelflex External can be used on substrates such as mineral screeds made with Kerakoll Keracem Eco as binder or pre-mixed product, cement-based screeds, prefabricated concrete or fresh concrete castings.
Preparation of substrates:
Prior to applying Kerakoll Levelflex External Levelling Compound, the substrate must comply with current British standards and industry regulations. In general, substrates must be free of dust, oil and grease, free from any moisture rising, with no loose, flaky or imperfectly anchored parts such as residues of cement, lime, paint coatings and adhesives, which must be completely removed. The substrate must be stable, non-deformable, without cracks and have already completed the curing period of hygrometric shrinkage. In particular, substrates must be treated with a suitable primer as follows:
- Cement-based screeds: Kerakoll Active Prime Fix, diluted
- Concretes: Kerakoll Active Prime Fix, diluted
Mixing:
Pour 3.5 – 4.2 l of clean water into a clean container; then pour in a bag of Kerakoll Levelflex External, while shaking. Mix with a mechanical mixer until a smooth, lump-free and self-levelling mixture is achieved. Larger quantities of Kerakoll Levelflex External may be prepared in suitable mixers. After the first mixing, it is advisable to leave the mixture to rest for approx. 2 minutes and then mix again briefly.
Kerakoll Levelflex External features a high degree of self-levelling capacity. Adding extra water does not improve its workability, and may cause shrinkage in the plastic phase of drying and result in less effective final performance with a reduction in surface hardness, compressive strength and adhesion to the substrate.
Application:
Kerakoll Levelflex External is generally applied with a flooring trowel. Application with a mechanical pump enables homogeneous correcting in a very short time on large continuous surfaces. The use of a spike roller or aeration roller can be used to further improve the surface finish of Kerakoll Levelflex External by removing entrapped air from the mixture.
Cleaning: Residual traces of Kerakoll Levelflex External can be removed from tools using water before the product hardens.
Joints: perimeter expansion must be allow for in the application of self levelling compounds. Perimeter expansion edging strip must be installed along the whole perimeter of the room, on the walls and on any other vertical elements protruding from the supporting layer. Large and continuous surface areas need to be fractionized as soon as they can withstand foot traffic so to create areas < 100 m2 with 10 m maximum individual size. All movement or expansion joints located in the substrate must be respected.
Overlaying: if an additional application of Kerakoll Levelflex External is required once the initial application has been completed, the first installation layer must first be hardened and ready to accept foot traffic and additional application, this is generally after 3 hours. The initial layer must be primed with a neat coat of Kerakoll Active Prime Fix prior to subsequent applications.
Technical Data:
Appearance: grey pre-mixed
Apparent volumetric mass: ≈ 1.18 kg/dm3
Mineralogical nature of inert material: silicate – crystalline carbonate
Grading: 0 – 600 μm
Shelf life: ≈ 12 months from the date of production in the original, unopened packaging; protect from humidity
Mixing water: ≈ 3.8 – 4.2 l / 1 bag 20 kg
Specific weight of the mixture: ≈ 2.03 kg/dm3 UNI 7121
Self levelling time: ≈ 30 min.
End setting time: ≈ 3 hrs
Temperature range for application: from +5 °C to +35 °C
Maximum thickness: between 2 and 50 mm
Foot traffic: ≈ 3 hrs
Waiting time before laying: – ceramic, porcelain, natural stone and mosaic tiles ≈ 3 hrs
Coverage: ≈ 2.50 kg/m2 per mm of thickness
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