It’s very important that the treatment of the floor is taken into account after the use of liquid screed, this will impact the integrity and function of the finished result. After the installation, your flowing screed should be provided with the correct protection from rapid drying and draughts for at least the first 48-72 hours.
Factors to be considered when drying:
After pouring the liquid screed you can elevate the room temperature which will aid the drying of the screed through an improved evaporation. The area poured should then be suitable for taking light foot traffic at 48-72 hours.
It’s important to provide good ventilation to the liquid screed this ensures a low RH. This is because a high RH can slow the drying performance of the screed. You can then use a dehumidifier as early as 72 hours after the screed has been placed. The optimum moisture for the liquid screed before laying floor coverings is below 75% RH (0.5% moisture)
Liquid Screed should be protected from moisture ingress, this is in order to prevent rehydration which will delay the drying process.
Underfloor heating can be commissioned after 7 days, this helps raise vapour pressure which improves the drying characteristics of the liquid screed. This should be combined with ventilation. After 7 days, you can commission the under-floor heating on the lowest setting for the first 24 hours, then raise at a rate of 5 degrees per day to a maximum of 50 degrees. The underfloor heating should be turned on for 48 hours prior to doing the moisture content testing.
Screed drying times
Liquid screed can dry at a varied rate depending on the condition of the room. The standard rates for anhydrite screed at 1mm per day for the first 40mm, and then ½ mm per day for any further depth. Therefore a floor of 50mm would take 60 days to dry.