CT20
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PRE-DOSED READY TO USE AVERAGE DRYING CEMENTITIOUS SCREED PRODUCT AND FIELDS OF APPLICATION CT20 is used for the realization of indoor and outdoor screeds at adherent, non-adherent (desolidarized) and floating average drying. CT20 is a pre-dosed cementitius screed in polyethylene bags containing in separate sections silico-calcareous aggregates, Portland cement. The product complies with the European Standard EN 13813. CT20 is used for the realization of indoor and outdoor screeds at adherent, non-adherent (desolidarized) and floating average drying. CT20 can be walked upon after 24 hours after application, after 48 hours it can be covered with ceramic tiles, brick and natural stone for coatings that are sensitive to moisture such as wood, linoleum, carpet, the waiting time is 8-10 days. CT20 comes within the requirements of the Standard UNI 11371 “Screeds for parquet and wooden flooring” and the Standard UNI 11493 “Floor and wall ceramic tiling ceramic”. With CT20 it is possible to create heating/cooling floors by inserting “radiant tubes” radians internally. With CT20 it is possible to create heating/cooling floors by inserting “radiant tubes” radians internally. ADHERING SCREEDS CT20 in a thickness of 2-3 cm can be obtained in adherence to the substrate through the use of special adhesion promoters (water-based slurry, binder and latex rubber and epoxy resin). The substrate must be free of dust, loose material, oils and fats, release agents, seasoned and dry, the absence of moisture from the underlying layers and/or from the embankment. NON-ADHERING SCREEDS (DESOLIDARIZED) CT20 in a thickness of 4-6 cm can be obtained in a non-adherent (desolidarized) or floating manner by interposing in the first case a horizontal separator layer (vapour barrier) between the screed and the surface, in the second case a layer of thermal and/or acoustic insulation. The vapour barrier may be formed for example by a double layer of polyethylene sheets of 150 µm, overlapped for at least 100-150 mm and properly strapped on the connections. The polyethylene sheets must be pushed back also on all the vertical parts (walls, pillars, etc ...), exceeding the thickness of the screed itself. PREPARATION OF THE PRODUCT A bag of CT20 is to be mixed with the addition of 1 litre of clean water by means of a mechanical mixer (cement mixer, cochlea kneader until obtaining a consistency of moist earth (semi-dry), the mixing time should not exceed 3 minutes. CT20 can be mixed by hand with the aid of a shovel as long as the mixture is smooth and free of lumps. CT20 is mixed and transported also with the main machines for the screeds available on the market. EDILQUATTRO BERNARDELLI GROUP Via del Canneto, 53 | 25010 Borgosatollo (BS) - ITALY | Tel +39 030 2702372 | Fax +39 030 2703192 info@bernardelligroup.com | www.bernardelligroup.com

PRE-DOSED READY TO USE AVERAGE DRYING CEMENTITIOUS SCREED TECHNICAL DATA DESCRIPTION TESTING METHOD AVERAGE VALUES NORMAL LIMITS (on an annual basis) Maximum size of the aggregate Consistency Working time at 20 ± 2 °C Density of the hardened mortar Flexural strength after 28 days Compressive strength after 28 days Surface strength PACKAGING Polyethylene bags of 25 kg (Product subject to natural shrinkage) The technical data are average values on an annual basis obtained from the analyses carried out on samples from the factory production and performed in the laboratory under controlled...