Tiling a screed too soon whilst the substrate is still stabilising can result in tiles blowing away from their base heaving as the screed shrinks below.
Floor screed moisture content before tiling.
Moisture testing is carried out using a suitable approved method such as a flooring hygrometer or carbide bomb test.
By michael hailwood director laticrete uk.
What we should know before tiling them october 2017.
A high moisture content can affect the adhesive making the new tiles lose their bond and lift.
This is particularly important if you are working with a concrete subfloor.
On average your screed will need around 60 days to cure completely and you should conduct a moisture test before laying your new floor finishes.
Whatever the old flooring is the moisture levels must never exceed a relative humidity of 75.
Moisture testing of the screed where floor tiling is proposed.
How important is it to assess the moisture content of screeds.
Concrete slabs and floors can be excellent subfloor surfaces for tile and other floor coverings but too much moisture in the concrete can cause problems with flooring installations.
There is a resultant slower dissipation of construction moisture in the tiling system so it may be time to rethink this whole issue.
Typical values for moisture sensitive floor finishes are less than 0 5 water by weight or less than 75 relative humidity rh for impermeable floors and less than 1 w w for more permeable floors.
After this period retained water needs to evaporate away until a normal moisture content is reached.
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Before tiling the area must be fully dry to ensure the adhesive will adhere to the tile and floor screed without issue.
Before laying onto calcium sulfate screeds it is vital to ensure that the moisture content is at the correct level for the required floor finish.
During this time shrinkage occurs to compensate for the volume loss of water.
The biggest issue that has always been associated with floor screeding is the long drying period that stands as a major hurdle in the early completion of flooring.
Typically still dark in colour due to its moisture content.
Why not call one of our floor screed experts to find out exactly.
Therefore it s advisable to have a floor tested for moisture content prior to installing flooring or moisture barriers.
There s a quick and simple way of testing for moisture yourself but if you re pressed for time or want the reassurance of a professional test screed it can conduct a british.
Moisture testing should be carried out after the commissioning of the ufh system but before any tiles are laid.
