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It is important that an 8-10mm extruded polyethylene compressible strip with polythene skirt is fitted around all external, internal walls and partitions and including vertical pipe ducts and anything else protruding through the slab. This should be fitted to the full depth of material.

Conduits to be housed within the screed such as under floor heating pipes must be well secured to the insulation boards using the correct fixing process for the specified system. The minimum screed cover over the conduits should be achieved.

We always suggest the installation of expansion/contraction joints in all door thresholds to control the aspect ratios between rooms. These joints are needed to separate the under floor heating zones within the building. This joint can be called a movement/control joint. This helps to control movement within the screed due to expansion and contraction.

Fitting these within door thresholds allows for floor coverings such as tiles to also have a movement joint installed without it being in an unsightly place. Without such control joints, cracking may occur. Joints should be placed where the bay length is over 40 linear metres (un-heated) or the aspect ratio is greater than 8:1, 20 linear metres (heated) or the aspect ratio is greater than 6:1.

We will control the levels of the floor by deploying adjustable tripods throughout the area. These will be set using a laser level, staff and a single datum provided by the customer.