Understanding Why Your Floors Stay Cold
If you’ve chosen underfloor heating it will be for that luxurious feel, so sitting in a chilly room while the system “warms up” must be a major letdown. And while you’re waiting, you’re probably wondering: is it the plumber to blame? or is the system just inefficient? Usually, the answer to: why is my UFH taking so long to warm up? has a lot to do with the efficiency of the “thermal mass” above the pipes.
If your screed is too thick or poorly bonded, it acts as an insulator rather than a heat conductor, stopping the warmth from getting to you.
Capital Screeding is based in London and our screeders work across Essex and the South East. We always recommend using liquid screed when installing underfloor heating, because it’s the most effective way to wrap your UFH pipes in a dense layer with no air bubbles. This ensures your floor acts as a giant radiator, transferring heat with speed and precision.
Why Traditional Screed Doesn’t Work For UFH Installs
To understand why your heating is slow, you first have to look at what is sitting on top of your pipes. Traditional screed – often called ‘sand and cement’ screed -is a semi-dry, hand-applied mix that has been the industry standard for decades.
Builders often choose it because it’s cheap, widely available, and doesn’t require specialist pumping equipment. It causes problems for UFH systems because it is tucked into place manually, which means it’s prone to leaving microscopic air pockets around your heating pipes. These gaps act as insulators, which means that your boiler has to work twice as hard to push heat through the floor.
Capital Screeding specialises in liquid screed because it solves the ‘air gap’ problem. Unlike the thick, dry layers of traditional mixes, our liquid solution flows perfectly around every millimetre of your UFH system. By removing the insulating air and allowing for a much thinner floor profile, we ensure the heat reaches your feet in minutes, not hours.
Solutions for UFH Systems Using Traditional Screed
Understanding why your heating is slow is the first step toward fixing the problem. If your UFH pipes are encased in traditional screed, they are fighting against air pockets and excessive thickness. To improve your system’s impact and protect your property value, we recommend a series of adjustments designed to overcome these thermal barriers.
- Perform a Manifold Audit – Have a UFH specialist verify that your manifold is correctly calibrated for the specific thermal mass of a sand and cement floor.
- Increase Flow Efficiency – Adjusting the water temperature and flow rate can help ‘charge’ the floor more quickly, reducing the time you spend waiting for warmth.
- Eliminate Cold Spots – Professional balancing (adjusting water flow to ensure even, efficient heating) may compensate for the poor conductivity of older screed mixes.
- Smart Control Integration – Use intelligent thermostats that ‘learn’ the slow heat-up cycle of traditional screed, activating the system earlier to ensure your home is warm exactly when you need it.
Upgrading Your Floor for Maximum Impact
If you are already planning a renovation or replacing your floor finishes in the South East, this is the time to do something about a failing traditional screed. A replacement is essential if your existing floor shows signs of “curling” at the edges or cracking, as these structural failures further disrupt heat transfer. By specifying liquid screed now, you will be sure that your new flooring – whether stone, wood, or tile – performs at its absolute peak.
How to Specify Liquid Screed for Your Project:
Specify Thermal Conductivity (W/mK) – Don’t just ask for “liquid screed.” Specify a product with a minimum thermal conductivity of 2.2W/mK to ensure rapid heat-up times.
Require a “Drying Time” Schedule – Request a specialist mix that allows for early foot traffic (usually 24–48 hours).
Check Installer Expertise – Ensure you specify an established specialist like Capital Screeding who uses dedicated pumping equipment rather than manual mixing.
Select the Correct Underlayment – Request that your contractor to use a high-quality tanking membrane or thermal insulation board beneath the screed to prevent heat loss into the subfloor.
Want a Faster, More Efficient Heating System?
The frustration of a cold home can often be solved by looking beneath the surface. While traditional screed was once good enough, it no longer meets the standards of modern heating performance.
Capital Screeding is here to bridge that gap for clients throughout London and the South East. By choosing high-conductivity liquid screed, you eliminate the thermal bottlenecks that waste energy and time. We can provide the professional UFH installation needed to turn your underfloor heating into the efficient system it was always meant to be.
Upgrade to a more responsive home. Call Capital Screeding now to discuss your project and discover why we are the trusted choice for liquid screed in London, the SE, and Essex – 020 3369 3396
