How Long Does Liquid Screed Take To Dry?
Posted on: 20th August 2026
Last updated: August 2026
How long does liquid screed take to dry before you can walk on it?
Quick answer: Good news is most liquid screeds are walkable within 24 to 48 hours, whether they’re calcium sulphate (Gyvlon, Cemex Supaflo, Tarmac Topflow Screed A, Breedon Gypscreed) or cement-based (Cemfloor, Tarmac Topflow Screed C). Walking on it is one thing though. Getting it properly dry for flooring takes a bit longer, and the two screed families go about it differently.
Calcium Sulphate Screeds
Gyvlon and similar calcium sulphate screeds are usually happy to take your weight within 24 to 48 hours, which is handy when the programme is tight. From there, drying down to a level fit for floor coverings follows a rough rule of 1mm per day up to 40mm depth, then 0.5mm per day beyond that. A standard 50mm pour can take a few weeks to get there, which is exactly why fast-drying variants like Gyvlon Eco FD were developed. They use a modified internal structure to roughly halve the wait, walkable after 24 hours and generally ready for trades within 48.
Cement-Based Screeds
Cemfloor and Tarmac’s Topflow Screed C are just as walkable in 24 to 48 hours, but they ask for a bit more patience before flooring goes down. Cemfloor’s own guidance gives 7 days before tiling with fast-set “green screed” adhesives, and 14 to 28 days with standard adhesives or moisture-sensitive coverings like vinyl. Topflow Screed C is quoted at 21 to 28 days to dry fully, even though your boots are perfectly safe on it after two days.
What about humidity, temperature and air changes?
This is something that can catch people out, as drying speed really comes down to how much moisture the air around the screed can carry away. Warm, moving air pulls moisture out nicely, but cold, still or humid air barely shifts it, so a screed left in an unheated, unventilated building can sit wet for weeks longer than the same pour on a well-ventilated site. For the first 24 hours, you should keep windows and doors shut to protect the surface from draughts and rapid surface drying. After that, you can throw the place open and get some air moving through it.
Force-drying
If you’re up against the clock, calcium sulphate screeds can be force-dried by commissioning the underfloor heating from day 7. Flow temperature starts at 20 to 25°C for three days, then rises in 5°C steps to a maximum of 55°C, held for a further week, before stepping back down. Getting this wrong means a risk of cracking or curling, so you should stick to the manufacturer’s ramp rather than cranking up the thermostat. Cement-based screeds can also be force-dried from day 7, usually with heaters or dehumidifiers rather than underfloor heating, but it’s still a good idea to check progress with a moisture test before flooring goes down.
| Screed type | Example brands | Walk-on time | Typical time to floor coverings |
|---|---|---|---|
| Calcium sulphate (standard) | Gyvlon Eco, Cemex Supaflo, Tarmac Topflow Screed A, Breedon Gypscreed | 24 to 48 hours | Roughly 1mm/day up to 40mm, then 0.5mm/day beyond |
| Calcium sulphate (fast-drying) | Gyvlon Eco FD | 24 hours | Trades within 48 hours |
| Cement-based | Cemfloor, Tarmac Topflow Screed C | 24 to 48 hours | 7 days (green adhesives) to 21 to 28 days (standard adhesives/moisture-sensitive coverings) |
A good pour makes the whole drying process far more predictable, and that’s really where it starts. Tools like Dapple Bars and our stainless steel screed levelling tripods are built for exactly that, removing air pockets and setting a consistent level so the screed doesn’t get the chance to dry unevenly.
For any questions related to screed and concrete tools, please go ahead and contact us – our team will be happy to help.
Find our trusted screed tool stockists here.
How long does liquid screed take to dry before you can walk on it?
Most liquid screed is walkable 24 to 48 hours after pouring, regardless of whether it is a calcium sulphate screed or a cement-based screed. This applies to both major screed families sold in the UK: calcium sulphate flowing screeds (Gyvlon, Cemex Supaflo, Tarmac Topflow Screed A, Breedon Gypscreed) and cement-based flowing screeds (Cemfloor, Tarmac Topflow Screed C/Belitex). Walk-on time is not the same as full drying time. Reaching the moisture content needed for floor coverings takes considerably longer and depends on the screed type, thickness, and site conditions.
What's the difference between calcium sulphate and cement-based screed drying times?
Calcium sulphate and cement-based screeds both reach walk-on strength in 24 to 48 hours, but they diverge after that point. Calcium sulphate screeds like Gyvlon dry at a predictable rate of roughly 1mm per day up to 40mm depth, then 0.5mm per day beyond that. Cement-based screeds like Cemfloor follow a different curve, needing 7 days before tiling with fast-set "green screed" adhesives, and 14 to 28 days with standard adhesives or moisture-sensitive coverings such as vinyl.
How long does Gyvlon screed take to dry?
Gyvlon calcium sulphate screed is walkable within 24 to 48 hours and dries at approximately 1mm per day up to 40mm depth. A standard 50mm Gyvlon pour can take several weeks to dry fully under natural conditions. Gyvlon Eco FD, a fast-drying variant, is walkable after 24 hours and generally accepts trades and foot traffic within 48 hours, roughly halving the wait compared with standard Gyvlon.
How long does Cemfloor screed take to dry?
Cemfloor cement-based screed is walkable within 24 to 48 hours, but full drying for flooring takes 7 to 28 days depending on the floor covering. Cemfloor's own guidance, based on a 40 to 50mm pour, gives 7 days before tiling with fast-set green screed adhesives, 14 to 28 days with standard adhesives, and 21 to 28 days before moisture-sensitive coverings like vinyl. Tarmac's Topflow Screed C, a similar cement-based flowing screed, is quoted at 21 to 28 days to dry fully.
What factors affect how fast liquid screed dries?
Liquid screed drying speed depends on ambient humidity, temperature and air changes within the building. Warm, moving air carries moisture away from the screed surface efficiently, while cold, still or humid air slows drying significantly. Manufacturers like Cemfloor recommend keeping windows and doors closed for the first 24 hours to protect the surface from draughts, then increasing ventilation to encourage air movement across the floor once the initial set has taken place.
Can liquid screed be force-dried?
Yes. Calcium sulphate screeds can be force dried using underfloor heating from 7 days after pouring, and cement-based screeds can be force dried using heaters or dehumidifiers from the same 7-day point. For calcium sulphate screeds, the underfloor heating flow temperature is commissioned at 20 to 25°C for a minimum of 3 days, then raised in 5°C increments up to a maximum of 55°C, held for a further 7 days, before being stepped back down to ambient temperature. Following the manufacturer's ramp schedule matters, as heating too quickly risks cracking or curling the screed.