The technological innovation of REKORD® PRONTO revolutionises screed techniques in the restoration of dwelling houses or buildings where activities are ongoing during the execution of works, in the absence of an organised building site and in town or city centres. REKORD® PRONTO overcomes the difficulty of finding suitable inert materials and prevents dosage errors thereby ensuring specific professional screeds when laying resilient materials or coverings that are not resistant to moisture.

STATE-OF-THE-ART TECHNOLOGY – The technological innovation of REKORD® PRONTO

revolutionises screed techniques in the restoration of dwelling houses or buildings where activities are ongoing during the execution of works, in the absence of an organised building site and in town or city centres. REKORD® PRONTO overcomes the difficulty of finding suitable inert materials and prevents dosage errors thereby ensuring specific professional screeds when

laying resilient materials or coverings that are not resistant to moisture.

EXTRA-RAPID DIMENSIONAL STABILITY – REKORD® PRONTO provides superior technology for screeds with extra-rapid dimensional stability, allowing for professional laying of ceramic tiles after 6 hours and parquet after only 24 hours. The use of highdispersion fluidifying polymers and agents which regulate rheological properties completes the chemical structure of REKORD® PRONTO and ensures extremely reliable, high-performing screeds.

HIGH MECHANICAL RESISTANCE – The REKORD® PRONTO technology provides high levels of mechanical performance, superior to that of screeds created with Portland cement. The use of low-viscosity polymers, which regulate the hydration of the binder, reduces interstitial porosity and increases compactness, i.e. the essential conditions for long-life screeds subject to heavy traffic.

Screeds with extra-rapid setting and drying. Adherent screeds with thickness ≥ 20 mm,

floating screeds with thickness ≥ 40 mm. Maximum thickness 80 mm.

Compatible adhesives:

- cement-based adhesives with SAS Technology, reactive-epoxy and polyurethane twocomponent products, dispersed in water and in solvents solutions

Covering materials:

- homogeneous tiles, ceramic tiles, klinker, cotto, glass and ceramic mosaic of all types and formats, natural stone, recomposed materials and marble

- parquet, rubber, PVC, linoleum, moquette

Substrates:

- flooring in prefabricated concrete or fresh concrete castings, cement-based screeds and lightened concrete

Use

Indoor applications for civil, commercial and industrial use, also subject to thermal shock and freezing, heat-radiant slabs.

Do not use

In outdoor applications, on substrates which are wet and subject to continuous moisture rising; in environments where there is a constant presence of water; on deformable substrates, without having previously calculated the degree of flexure and having provided for the necessary fractionizing joints in the screed; in adherence on concrete castings which have not yet fully matured.

Desolidarise from vertical elements with a deformable, 10 mm band. For thicknesses < 40 mm insert a 50x50 mm mesh (Ø 2 mm), to be anchored to the substrate, and apply a slurry key "wet on wet" with 2.5 parts cement, 1 part P6 technical latex and 1 part water. On lightened substrates or substrates with thermal-acoustic insulation, the thickness of the screed and the reinforcement will have to be calculated on the basis of the deformability class of the materials mentioned above.

Preparation: REKORD® PRONTO must be mixed with clean water, using normal building-site equipment and following the indicated mixing ratio, until a semi-plastic consistency has been obtained. When working with temperatures close to 0 °C protect the bags containing the product against freezing and use warm water to improve workability. In the case of high temperatures, store the bags of REKORD® PRONTO in the shade and use cold water.

Application: REKORD® PRONTO must be applied following the phases required to produce cement-based screeds, i.e. preparation of level belts, casting and compacting the paste, levelling and final smoothing with a spreader or by mechanical means. Compacting is important to ensure the highest levels of mechanical performance. The finish of the screed, carried out by moistening it with water and using a steel disk, results in the creation of a surface crust with low

absorbency which will extend the drying time of the screed and worsen the performance of the adhesive. At the point where tubing is installed (minimum thickness of 2 cm), insert a tight-mesh, galvanised metal grid (2 – 3cm). Connect the construction joints with iron rod bolts every 20 – 30 cm and with a slurry key prepared with 2.5 parts cement (32.5 / 42.5), 1 part P6 technical latex and 1 part water.

Cleaning: Residual traces of REKORD® PRONTO can be removed from machinery with water before the product has hardened.

Elastic joints: respect the structural joints. Provide for expansion joints at thresholds, niches, corners, edges, wall openings and fractionizing joints in the case of large continuous surfaces.

Measurement of humidity: residual humidity must be measured with a calcium carbide hygrometer. Normal electric hygrometers will provide incorrect values owing to the special binders used.

- Product for professional use

- low temperatures and high relative environmental humidity lengthen screed drying times

- an excessive quantity of water reduces mechanical resistance and the rapidity of drying

- before laying parquet and resilient materials, check residual humidity with a calcium carbide hygrometer

- do not add water to REKORD® PRONTO during the setting phase

- do not moisten the screed once it has been created; protect from direct sunlight and air currents for the first 6 hours

- high temperatures considerably reduce workability times

- apply an upturned vapour barrier on the surfaces for laying water-sensitive flooring or on substrates which are at risk for rising damp

- if necessary, ask for the safety data sheet

- for further information please consult the Kerakoll Worldwide Global Service +39-0536.811.516

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