The heating elements for the underfloor heating are usually encased in a layer of screed before the installation of the final floor covering. In the case of hydronic underfloor heating, the heating pipes are usually secured to insulation panels on the floor slab fitted with moisture barriers, and the screed layer is laid over this to provide a level surface for installing the final floor finish.
Though traditional sand, cement screeds are generally used for screeding over underfloor heating, this can be quite time consuming as the screeds require a long time period for drying sufficiently to take on the final floor covering. However, though an obvious option, the underfloor heating system cannot be utilised to accelerate the drying process as it can result in the cracking of screed due to quick drying.
Fast Drying Floor screeds help to overcome this issue, drying much faster than traditional screeds while allowing the screed mix to hydrate fully. They act as capillary pumps, removing excess water and locking in the rest of the water by crystallisation, thus preventing the cracking of screed. An example for Fast Drying screed is Isocrete K-Screed fast drying floor screeds. The different types of screed laid over underfloor heating are:
Underfloor heating(UFH) is a highly efficient form of space heating that generates heat through electric or hydronic heating elements embedded beneath the surface of the floor. The heating elements are typically secured to insulation panels on the floor slab and the screed layer is installed over the heating elements before laying the final floor finish.
Apart from serving as a level surface for taking on the final floor finish, a good screed plays the important role of conducting the heat evenly across the surface of the floor, without producing any hot or cold spots. A good quality screed, laid to the right depth helps to retain the heat for longer hours, reducing the energy required at the source and improving the energy efficiency of the UFH system. A wide range of screeding options are now available for underfloor heating systems: