Calcium sulphate grades for Royal Tunbridge Wells apartments
Look at the floor notes on a drawing and the calcium sulphate will be described by a code. You will usually meet one of three, from CA-C20-F4 at the lighter end, through CA-C25-F5, up to CA-C30-F6. The European screed standard reads the two numbers as strengths in N/mm2, compressive after the C and flexural after the F.
Put simply, the first is for lightly used domestic floors, the second for the majority of houses, flats and offices, and the third for floors that take a beating. Whoever designs a block of flats picks the grade, and that is the one we put down. Occasionally the design asks for an alpha hemihydrate instead, because it dries faster or can go in thinner, and then depth and drying follow that product's own sheet.
What makes anhydrite practical is how little it shrinks. A flat over insulation, an acoustic layer or heating pipes can be poured in a single visit, in large bays with hardly any joints. Before pour day we set out where bays end and where movement joints go, paying particular attention to doorways and the edges of heating zones.
Conversions bring their own questions. A flat created inside a period building may have uneven concrete, timber in places and tight height limits. Calcium sulphate can work over a properly prepared, isolated base, but the build-up has to be checked first, and sometimes a thin levelling solution is more sensible. For the fuller picture, read our explainer on anhydrite.
Laitance and moisture checks before Royal Tunbridge Wells flooring
A thin, weak layer called laitance appears on the surface while the screed dries out. Flooring glued onto that layer can let go, so when the floor is ready we sand it off and seal the surface with a primer made to suit calcium sulphate.
After sanding, we look at moisture. Flooring suppliers commonly set calcium sulphate a tighter moisture limit than cement screed, so guessing from the calendar will not do, and the figure has to come from a hygrometer. Any heating in the floor can normally be run to force dry it once roughly 7 days have gone by.
Water is the material's weakness. Calcium sulphate that stays damp for long periods loses strength, and a slow leak under a washing machine or a shower tray can soften the floor before anyone notices. Wet rooms, utility floors at risk of leaks and anywhere else that may stay wet should be on a cement based flowing screed or on sand and cement screed in Royal Tunbridge Wells. For older bases that need grinding, cleaning or repair before a new layer, see our floor preparation service. We also pour calcium sulphate in East Grinstead.
Anhydrite & Flow Screed prices in Royal Tunbridge Wells
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 Royal Tunbridge Wells
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 Royal Tunbridge Wells
As the crow flies, our yard in Slough is about 48 miles from Royal Tunbridge Wells, which lies to the east-south-east. Postcodes here include TN1, TN2 and TN4, and Tonbridge (4.1 miles), Crowborough (6.7 miles), Sevenoaks (10 miles) and East Grinstead (11.8 miles) are close by.
More on anhydrite screed, part of our screeding services.
