Specifying anhydrite screed for Billericay rebuilds and extensions
Replacing an older bungalow with a new house puts a builder in new build territory, with a full specification for the ground floor. On a plot like that, calcium sulphate flow screed is a common choice over insulation and underfloor heating. The drawings should name a grade under the European screed standard, written as CA followed by two strength numbers.
CA-C20-F4 is suited to domestic floors with light traffic. Most houses, flats and offices are poured in CA-C25-F5, and heavier use needs CA-C30-F6. The C number is the compressive strength, the F number the flexural, both in N/mm2. Alongside these are alpha hemihydrate products, used when the floor must dry faster or be thinner, each to its own product sheet.
There is very little shrinkage as the material cures. That lets it be poured in large bays with few joints, which suits the open plan ground floors that replacement houses and big extensions tend to have. Bays and joints are still drawn up in advance, with care at doorways and wherever the floor changes shape, and our own team lays the build-up below.
Flats are a small part of the picture in Billericay, at 10% of homes, but where a block is built or refurbished the same grades apply. For pumping, access and walk-on times, see the liquid screed page. To read more on the material, try our anhydrite screed explainer.
After the pour: laitance and testing in Billericay homes
Once a calcium sulphate screed has dried, its surface carries a thin layer of laitance. It passes for solid floor, yet it is weak, and adhesive, primer and compound do not hold to it well. We sand it away, take up the dust and prime with a product suited to calcium sulphate, as plenty of primers and adhesives are not.
Moisture testing comes next. Flooring makers often allow calcium sulphate less moisture than cement, so tiles, LVT or wood only go down once the floor is properly dry. We use a hygrometer to confirm it. On a heated Billericay floor, running the system from about day 7 can force dry it and cut the wait.
Some rooms are wrong for it. It should not be used where the floor may get wet: a wet room, a shower floor or a utility area where water may stand. On a Billericay rebuild, those rooms usually get a flowing cement screed, or sand and cement laid by hand, next to the anhydrite in the dry rooms.
Anhydrite & Flow Screed prices in Billericay
Liquid flowing screed (which includes anhydrite): £24 to £31 per m² supplied and laid (MyJobQuote, August 2026), so £960 to £1,240 for 40 m². MyJobQuote does not say whether these figures include VAT. See our floor screeding cost guide or screed calculator.
Who lays your anhydrite and flow screed in Billericay
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.
Anhydrite & Flow Screed from Slough to Billericay
On the map, Billericay sits east of Slough, about 46.2 miles from our base in a straight line (postcodes including CM12 and CM11), next to Basildon (4 miles), Wickford (4.5 miles), Brentwood (4.8 miles) and Stanford-le-Hope (7 miles).
More on anhydrite screed, part of our screeding services.
