The Basics of Liquid Floor Screed
The type of floor in your home has a massive effect on the building process and final result, make sure you’re aware of the type of screed that is used and its advantages and disadvantages.
Traditional sand/cement screed is laid semi-dry, either mixed on site or delivered from a factory whereas liquid or flowing screeds are delivered in a truck mixer and pumped into the development, there are two categories; anhydrite based, and cement based.
The installation of a liquid floor screed is much lower because it is a less labour-intensive compared to a traditional applied screed. Liquid screeds are pumped and simply ‘dappled’ from an upright stance because they are much faster to lay. If you are looking to liquid screed your whole home, then the pouring and levelling process should only take a few hours.
A liquid floor screen has a more even surface than a traditional hand laid semi-dry traditional screed because it is denser sound is deadened and heat transfer speeded up. Having a better heat transfer can be better for when underfloor heating is in place. Anhydrite screeds are more thermally conductive than cement screeds.
Both cement and anhydrite based liquid screed doesn’t shrink or curl.
Long drying times could be a problem, if you need a faster drying screed then you need to carefully consider which flowing screed to use. Anhydrite based screeds dry at 1m of thickness, per day up to 40mm. A typical 50mm deep anhydrite screed would take up to 60 days to dry before tiles or other floor covering can be applied.
A cement-based screed dries out at a third of that time, it would take 20 days to dry a 50mm thick floor. Normally, both anhydrite and cement based liquid screeds are fine to walk on after 24 hours.