You should not switch on underfloor heating as soon as the screed is laid. The correct waiting time depends on the type of screed used and how quickly it dries.
Traditional sand and cement screed usually needs around 21 to 28 days before underfloor heating can be commissioned. Liquid or flowing screeds may be ready sooner, often after around 7 days, but the manufacturer’s guidance should always come first.
One thing many online guides miss is the effect of local conditions. In Glasgow, Paisley, and surrounding areas, cooler temperatures and higher moisture levels can slow drying times, especially in older sandstone properties and ground floor extensions.
Why Turning It On Too Early Causes Problems
If heating is introduced before the screed has cured properly, moisture can become trapped and the surface may develop cracks. This can affect floor finishes later and create avoidable repair costs.
The safest approach is to increase the temperature gradually. Most systems are commissioned by starting at a low temperature and increasing it slightly each day until the normal operating level is reached.
If you are unsure whether your screed is ready, professional moisture testing can provide a clearer answer before flooring is installed.
For more advice, see our guide on underfloor heating screed drying times and aftercare.
If you are still unsure after carrying out basic checks, our Glasgow team can provide clear guidance, moisture testing advice, and fixed price quotes with straightforward communication throughout the process.
Getting the Best Result from Your Floor
Allowing enough drying time helps protect both the screed and the heating system. It also reduces the risk of delays when fitting tiles, vinyl, or engineered flooring.
For reliable advice and professional floor screeding services across Glasgow and surrounding areas, contact LMA Floor Screeding today. We provide fixed price quotes, clear communication, and experienced support for residential and commercial projects.