One of the first questions we get asked on site — usually before the pump even starts — is how long the liquid screed will take to dry. And it’s a fair question. Flooring is one of the final stages of a build, and by the time clients reach this point, they’re eager to see the job wrapped up.
The truth is, drying times aren’t as simple as “X days per millimetre.” We’ve seen floors dry quicker than expected, and we’ve seen others take their time because the weather turned or ventilation wasn’t ideal. After years of installing liquid screed across new builds, extensions, and commercial spaces, we’ve learned what actually affects drying — not just what the brochures say.
This guide breaks down the real‑world timelines you can expect, along with the small details that make a big difference.
How Long Before You Can Walk on Liquid Screed?
Most liquid screeds allow light foot traffic within 24–48 hours. We’ve had jobs where we were walking the floor the next morning, and others where we advised waiting the full two days because the temperature dropped overnight.
The key is not to rush it. Even though the surface feels solid, the screed is still going through its early curing stages. Keeping trades off it for the first day or two prevents scuffs, dents, and unnecessary repairs.
If you’re comparing screed types, the blog Liquid Screed vs Traditional Screed explains why liquid screed reaches this stage so much faster.
When Can Underfloor Heating Be Switched On?
This is the part that makes people nervous, especially if they’ve never used UFH before. The general rule is to wait 7–10 days before commissioning the system. That gives the screed enough time to stabilise.
On site, we always follow a gentle heat‑up cycle:
- Start at a low temperature
- Increase gradually over several days
- Never jump straight to full heat
We’ve seen what happens when someone gets impatient and cranks the system too early — hairline cracks, curling edges, and unnecessary stress on the floor. A slow, steady approach always wins.
If you want to understand why UFH and liquid screed work so well together, the blog How Liquid Screed Improves Underfloor Heating Efficiency goes into more detail.
Full Drying Times: The Part That Really Matters
This is where things vary. A standard liquid screed typically dries at around 1mm per day up to 40mm, and then a little slower beyond that. But that’s only a guideline. In reality, drying depends on:
- Ventilation
- Temperature
- Humidity
- Screed depth
- Whether the UFH is used to assist drying
- The type of liquid screed (standard vs fast‑drying)
We’ve had 50mm pours dry in a few weeks during warm, dry weather. We’ve also had similar depths take longer in winter when the air was heavy and cold.
The best approach is simple: don’t guess. Test.
Why Moisture Testing Is Essential
Before laying wood, vinyl, or any moisture‑sensitive flooring, we always recommend a proper moisture test. It’s a small step that prevents big problems.
We’ve seen floors fail because someone assumed the screed was dry based on time alone. Moisture trapped beneath flooring can cause:
- Warping
- Lifting
- Adhesive failure
- Mould growth
A quick test removes all doubt. Flooring installers appreciate it, and clients get peace of mind.
How to Speed Up Drying (Without Damaging the Screed)
There’s a right way and a wrong way to help liquid screed dry. We’ve seen both.
The right way:
- Open windows slightly to create airflow
- Use UFH on a controlled commissioning cycle
- Keep the site warm but not overheated
- Remove surface laitance at the right time
The wrong way:
- Blasting heaters directly at the floor
- Sealing the room with no ventilation
- Turning UFH on full power
- Laying flooring based on guesswork
We’ve been called to fix floors where someone tried to “speed things up” with a space heater. It never ends well.
If you’re unsure about laitance removal, the blog Top Mistakes to Avoid When Installing Liquid Screed touches on why this step matters.
Fast‑Drying Liquid Screed: When Time Is Tight
On some projects — especially commercial ones — timelines are tight. In those cases, we sometimes use fast‑drying liquid screed. These mixes can reduce drying times significantly, but they still need proper ventilation and moisture testing.
We’ve used fast‑drying options on jobs where flooring installers were booked weeks in advance and the schedule couldn’t budge. When handled correctly, they perform brilliantly.
Real‑World Example: A 60mm Pour in a New Build
To give you a sense of what actually happens on site, here’s a typical timeline from a recent project:
- Day 1: Screed poured
- Day 2: Light foot traffic
- Day 7: UFH commissioning begins
- Week 3: Moisture levels dropping steadily
- Week 5: Moisture test confirms safe levels for flooring
- Week 6: Final floor installed
This was during mild weather with good airflow. In winter, the same job might have taken an extra week or two.
Final Thoughts
Drying times aren’t something you want to gamble with. A floor that looks dry on the surface can still hold moisture deeper down, and that’s where problems start. After years of installing liquid screed, we’ve learned that patience, ventilation, and proper testing make all the difference.
If you’re planning a project and want accurate timelines based on your specific site conditions, we’re always happy to take a look and give you a realistic estimate — not just the textbook answer.