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CHOOSE Kerakoll outlines how to select the correct subfloor products for failsafe insta


Kerakoll’s Keracem range of screeds are perfect for preparing subfloors: Keracem Eco is a rapid drying mineral binder for high performance screeds and heat radiant slabs that is suitable for both indoor and outdoor use. When mixed with inert materials it creates screeds with high dimensional stability and constant moisture stability, meaning that ceramic tiles can be laid after 24 hours and hardwood floors after 5 days. The mechanical performance of screeds created using Keracem Eco is superior to that of Portland cements.


Where a ready-mixed screed is preferred to a binder - Keracem Eco Pronto is the solution with the rapid drying properties of Keracem Eco, it also develops excellent thermal conductivity - essential in heated substrates to allow the system to heat up quickly and evenly.


SUCCESS IN SPITE


OF IMPERFECTIONS For projects where the screed is cracked and it is not practical to re-lay it, or there is not sufficient time to allow the new screed to cure before work needs to commence, Kerakoll’s Laminate No Crack Uncoupling system is the solution. This is as an uncoupling, anti-cracking system for cracked screeds which also compensates for hygrometric shrinkage in uncured substrates, especially in fast- track projects.


The system is made up of two components: the Green-Pro membrane and a Biogel adhesive. The Green-Pro membrane is composed of three layers – the first has hydrophobic PA fibres which ensure a secure bond with the tile adhesive as well as restricting water movement in the adhesive, the second is an HDPE waterproof structure which bends with the movement in the floor and compensates for stresses caused by hyrgrometric shrinkage and cracks, the third is a non-woven breathable fabric which allows vapour to disperse. The Biogel adhesives are an award- winning range of adhesives that have revolutionised the way that adhesives are specified as the same formulation


50 | SUBFLOOR PREPARATION


can be used on all substrates and for all types of tiling material.


The Green-Pro membrane is laid on top of a layer of Biogel No Limits or Revolution to create a laminated bond between the membrane and screed. On top of this is applied another layer of Biogel adhesive to fix the chosen tiles. This again creates a laminated bond between the mat and the floorcovering. Tiling can commence as soon as the membrane is down without waiting for the first adhesive layer to dry. The system is finished with Fugabella Eco Flex grout and Fugabella Eco Silicone in the movement joints. There is no necessity to follow joints in the screed through the tiling installation so the tiles can be laid in any pattern desired.


The system is also ideal for use with underfloor heating systems as the Green-Pro membrane has a thermal resistance of 1.030 m³ K/W, and thus does not impede the passage of heat. It is suitable for use in industrial settings subject to high-impact and extremely heavy loads, having passed the Robinson Test for resistance to dynamic stress (ASTM Standard C 627 tested with 10mm thick porcelain tiles).


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