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| Solve That Heat and Sound Problem |
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Schlüter-Systems Movement Joint Series, Solve that heat and sound problem
Last time we looked at how surface tile design could be improved by using a modular screed system which does not need movement joints. Therefore, as there are no movement joints in the screed, there is more leeway as to where surface movement joints can be installed.
Ian Knifton, Technical Manager at Schlüter–Systems, now explains how the system works.
It is a panel underlayment system which allows for easier installation, and is far less labour-intensive than traditional floor construction. It assures a crack-free ceramic tile and natural stone covering above a screed and insulating layer. The screed can be installed with or without underfloor heating pipes. Surface movement joints are only required in line with industry recommendations, and can therefore be incorporated to suit any aesthetic design of the tiled floor.
A studded polystyrene panel, known as Schlüter®-BEKOTEC, is placed either directly over a load-bearing substrate, or over traditional acoustic or heat insulation. Stress build-up due to shrinkage, which occurs during the curing of the screed, is successfully eliminated by the formation of micro-fine cracks, doing away with the need for movement joints in the screed.
Basically, the studs on the panel result in an intentional weakening of the underside of the screed layer through their even spacing. When the screed shrinks, the network of micro-fine cracks form between the studs. Consequently, the screed slab loses its compressive stresses, so the forces causing curling and cracks simply cannot accumulate.
As soon as the screed can be walked on, an uncoupling membrane is bonded to it, and ceramic tile or stone coverings are then installed onto the mat, incorporating surface movement joints in line with industry recommendations. Coverings which don’t crack -- such as carpet and vinyl -- can be fitted as soon as the screed has dried sufficiently.
Because of its lighter weight and lower assembly height, it is installed faster than traditional underlays, the screed does not curl, and, most importantly, the surface coverings are guaranteed crack-free.
