Heated extensions and garden rooms across Woking
The screed is what makes a wet underfloor heating system work. Pipes laid on insulation do nothing useful until they are surrounded by a material that takes their heat and spreads it across the room. If the screed is too thin it cracks over the pipes; if it is laid with air pockets around them, warm and cold patches appear.
The depth rules are simple. Liquid wants a minimum of 25mm above the pipe tops, which takes the whole layer to about 45 to 50mm. Sand and cement needs roughly 45mm on top of the pipes, so that floor ends up thicker. On a new extension with a properly designed floor build-up, either can work. Where the extension has to meet the floor of a house built in the 1970s, as so many in Woking were, the lower depth of a liquid screed laid over the pipes often makes the levels work without losing insulation.
New homes go a step further. Since 2015, 7% of Woking's homes have gone up, and plenty of recent designs put the heating into a flowing screed from day one.
An older Woking house is a trickier retrofit. Taking up a solid floor to add insulation, pipes and screed means the whole build-up must fit under the same thresholds and bottom stair. That is a question to settle before buying a heating kit. The screed thickness guide shows how the layers add up, and the insulation underneath can be supplied through our insulation and membranes service.
Switching the heating on in a new Woking floor
Commissioning is where a heated floor is most often damaged. The screed has to cure first, then warm up slowly.
Calcium sulphate can normally be warmed from about 7 days after pouring, whereas a sand and cement floor has to wait 21 days or more. Whichever you have, the flow temperature begins low, is nudged up a few degrees at a time across a fixed run of days, held there, and then brought back down. Your heating engineer and the screed manufacturer's sheet set the exact steps, and we leave written guidance on the day.
Turning the heating straight up to dry the floor faster causes cracks and curling at the edges. A gradual warm-up also helps dry the screed ready for flooring, which is useful when a kitchen fitter is waiting.
Pressure testing comes before all of this. Ask your installer to fill the loops and test them before pour day, and to leave them pressurised while the screed goes in, so a leak would show at once. Heated screeds in nearby Weybridge follow the same sequence.
Underfloor Heating Screed prices in Woking
Liquid screed over underfloor heating: £20 to £35 per m² supplied and laid (trade2base, June 2026), so £700 to £1,230 for 35 m². trade2base gives these figures excluding VAT. See our floor screeding cost guide or screed calculator.
Who lays your underfloor heating screed in Woking
K & B Screeding’s own team, led by director Donatas Bardisevicius. Founded 2019, company 12298780.
See what customers say in our Google reviews and on our testimonials page.
Underfloor Heating Screed from Slough to Woking
As the crow flies, our yard in Slough is about 15.2 miles from Woking, which lies to the south-south-east. Postcodes here include GU21, GU23 and GU22, and Addlestone (4.6 miles), Guildford (5.5 miles), Chertsey (5.6 miles) and Weybridge (5.7 miles) are close by.
More on underfloor heating screed, part of our screeding services.
