Levelling compounds are used to prepare your subfloor prior to tiling. For example, it is recommend to pour a layer of levelling compound over electric underfloor heating mats, to provide a smooth base for tiling and protect the heating wires.

Kerakoll Levelflex Gel is a rapid-setting, fibre reinforced self levelling compound with Gel-Technology. It is free flowing with variable rheology and prolonged workability. The variable rheology and viscosity allows for exceptional control under the trowel that can be adapted to meet the specific requirements of your project. Whether a flowable self-smoothing layer is required or a more robust trowelable self levelling application, it delivers outstanding results every time.

Kerakoll Levelflex Gel Levelling Compound is intended for self-levelling adjustment of irregular and uneven substrates, with rapid setting and drying, compensated shrinkage. Kerakoll Levelflex Gel is suitable for depth thicknesses from 2 to 100 mm. It is only for use on internal floors in domestic, commercial and industrial applications.

Kerakoll Levelflex Gel Levelling Compound is compatible 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.

Kerakoll Levelflex Gel can be used with porcelain tiles and ceramic tiles, natural stone, recomposed materials, marble, mosaic tiles, decorative resins from the Kerakoll Color Collection range and resins for industrial floors from the Kerakoll Factory range (film systems for foot traffic in domestic environments, multilayer systems for foot traffic in commercial environments). Kerakoll Levelflex Gel can also be used on mineral screeds made with Kerakoll Keracem Eco as binder or pre-mixed product, cement-based screeds, calcium sulphate-based screeds, prefabricated concrete or fresh concrete castings, ceramic floors, flooring grade plywood, gypsum fibre or fibre-cement panels and metal substrates.

Do not use Kerakoll Levelflex Gel Levelling Compound in external applications or areas that are continually submerged.

Preparation of substrates:

Prior to applying Kerakoll Levelflex Gel 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, without cracks and have already completed the curing period of hygrometric shrinkage. In particular, the following substrates must be treated with suitable primer from the Kerakoll Primer range as follows:

Cement-based screeds
Calcium sulphate based screeds
Concretes
Ceramic floors, ceramic tiles
Flooring grade plywood
Gypsum fibre or fibre-cement panels
Metal substrates

Mixing:

Pour 4.5 – 5.2 l of clean water into a clean container; then pour in a bag of Kerakoll Levelflex Gel, while shaking. Mix with a mechanical mixer until a smooth, lump-free and self-levelling mixture is achieved. Larger quantities of Kerakoll Levelflex Gel 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 Gel 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 Gel is generally applied with a flooring trowel. Application with mechanical pumps allows the installer to very quickly achieve a smooth high-thickness finish for large areas. The use of an aeration or spike roller can be used but is not required to further improve the surface finish of Kerakoll Levelflex Gel, but will work to remove entrapped air from the mixture. If an additional application of Kerakoll Levelflex Gel 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 90 minutes. The initial layer of Kerakoll Levelflex Gel must be primed with a neat coat of Kerakoll Active Prime Fix prior to subsequent applications. In the case of low temperatures and high humidity it is advisable to keep the environment ventilated during application and during the hours immediately following application, in order to avoid the formation of condensation on the surface of the self-levelling gel during the setting phase.

Cleaning: Residual traces of Kerakoll Levelflex Gel can be removed from tools using water before the product hardens.

Joints: perimeter expansion must be allowed 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 broken into bays 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.

Hardwood floors: for subsequent laying of hardwood floors, create a smooth finish with thickness ≥ 3 mm. Moisture-sensitive coverings: when laying moisture-sensitive coverings the residual moisture of Kerakoll Levelflex Gel must be checked on site in accordance with current regulations.

Technical Data:
Appearance: grey pre-mixed
Apparent volumetric mass: ≈ 1.17 g/dm3
Mineralogical nature of inert material: silicate – crystalline carbonate
Grading: 0-600 μm
Shelf life: ≈ 12 months from production in the original sealed packaging, protect from humidity
Mixing water: ≈ 4.5 – 5.2 l / 1 bag 20 kg
Specific weight of the mixture: ≈ 2.01 g/dm3 UNI 7121
Self levelling time: ≈ 30 min.
End setting time: ≈ 90 min.
Temperature range for application: from +5 °C to +35 °C
Maximum thickness: from 2 to 100 mm
Foot traffic: ≈ 90 min.
Waiting time before laying: – ceramic, porcelain, natural stone and mosaic tiles ≈ 90 min. – resins ≈ 12 hrs
Coverage: ≈ 1.525 kg/m2 per mm of thickness

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