Getting pipe cover right in High Wycombe extensions
In a heated floor, the screed is what holds and spreads the warmth. Skimp on cover over the pipes and the floor may crack or show warm stripes; overdo it and the room is slow to heat. So the build-up needs planning before the slab is cast, ideally with the heating engineer and builder settling the finished floor level between them.
Over the pipes in a High Wycombe extension, pumped liquid screed needs a minimum of 25mm, so the finished floor ends up about 45 to 50mm deep. Pumped in, it fills every gap around each pipe, leaving no voids, so the room warms up sooner. Sand and cement wants about 45mm of cover, compacted carefully round every pipe. Our liquid screed page for High Wycombe walks through the pumped method.
Homes from 1919 to 1944 account for 16% of the town, and extending one means the new heated floor has to meet a floor level fixed nearly a century ago. Measure down from there: finish, screed, pipes, insulation and membrane all need to fit. If the sums do not work, change the insulation or screed before the slab goes in rather than after; a thinner liquid screed or a slimmer high performance insulation board will often win back the few millimetres missing.
We look over the edge strip, membrane and insulation ahead of the pour, and if you need the full build-up supplied, our insulation and membranes service provides it.
Switching on the heating in a High Wycombe home
Since the year 2000, 22% of High Wycombe's homes have gone up. Recent plot or new extension, the weeks after a heated pour run to exactly the same rules.
Calcium sulphate can usually take its first warmth at around 7 days, whereas sand and cement keeps the heating off for no less than 21. Then, for either one, set the flow temperature low and creep it up over several days, hold it steady, and bring it down again. Turning the system up high on the first day risks cracking the screed and spoiling the finish that follows.
Warming the floor helps it dry, but a moisture test is still needed before any flooring goes down. How depth and screed type change the wait is covered in our drying times guide.
Bathrooms on the heating circuit are the exception to a pumped calcium sulphate floor: give them a cement based screed, as calcium sulphate is not meant for floors that may get wet. A hand-laid sand and cement screed also works for smaller heated rooms where setting up a pump is awkward.
Underfloor Heating Screed prices in High Wycombe
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 High Wycombe
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 High Wycombe
As the crow flies, our yard in Slough is about 8.1 miles from High Wycombe, which lies to the north-west. Postcodes here include HP11, HP12 and HP13, and Marlow (4.1 miles), Beaconsfield (4.7 miles), Amersham (6.9 miles) and Maidenhead (7.4 miles) are close by.
More on underfloor heating screed, part of our screeding services.
