Reading the CA code on an Eastbourne apartment specification
Pick up the floor schedule for an Eastbourne block and the screed line will read something like CA-C25-F5. CA names the binder, calcium sulphate. The figure after C is how hard the cured screed resists crushing, and the figure after F is how well it resists snapping, both counted in N/mm2 under the European screed standard.
Three versions cover nearly every floor. CA-C20-F4 belongs in lightly trodden domestic rooms. CA-C25-F5 is the workhorse for homes, apartments and offices. CA-C30-F6 is kept for floors expected to take a beating. Whichever one the engineer writes down for an Eastbourne job is the one our pump delivers, unchanged.
A few schedules skip the CA codes and name an alpha hemihydrate product. Designers reach for one of those when the programme cannot wait for a slower dry, or when headroom leaves only a slim layer. Each brand publishes its own sheet for minimum thickness and drying time, and on those jobs the sheet is the rulebook.
The binder's real gift is stability. Because a calcium sulphate floor hardly contracts as it sets, an Eastbourne living room and kitchen can share one wide pour with only a handful of joints. Before pumping, we sketch the bay plan with you so joints fall at door thresholds and along the line where one heating circuit hands over to the next.
New building is a small slice of local housing, with only 9% of Eastbourne homes built since 2000, so plenty of flat floors here sit inside older buildings such as the Victorian villas of Meads and Upperton that have been split into flats. How anhydrite behaves as it cures is covered in our guide, and the Hailsham anhydrite page covers the same material nearby.
Sanding, humidity and wet rooms in Eastbourne flats
Three jobs stand between a freshly poured Eastbourne floor and its tiles or boards.
The top skin comes off first. As calcium sulphate cures, fine material drifts up and dries into a soft crust, the laitance. Glue spread on that crust holds the crust, not the slab beneath, and the finish lets go. Once the floor has dried far enough, our team abrades the surface back to firm screed and clears the dust. Should your fitter prefer someone else to do it, our floor preparation crew can take it on.
Next comes the humidity check. Plenty of flooring brands set a tighter dryness limit for calcium sulphate than for cement, so an Eastbourne floor that feels bone dry may still fail. A hygrometer sealed to the surface gives the figure we compare against the maker's limit. In a heated flat, gentle force drying through the pipes can usually start at around a week.
Last, a primer formulated for calcium sulphate seals the surface before any cement based adhesive or smoothing compound touches it.
Water is the one thing this binder cannot live with. An Eastbourne wet room, walk-in shower or utility at risk of leaks should take a cement based flowing screed or a hand-laid sand and cement floor set to falls, joined to the anhydrite in the dry rooms around it.
Anhydrite & Flow Screed prices in Eastbourne
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 Eastbourne
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 Eastbourne
On the map, Eastbourne sits south-east of Slough, about 66.4 miles from our base in a straight line (postcodes including BN21, BN20, BN23 and BN22), next to Polegate (4.1 miles), Hailsham (6.8 miles), Seaford (7.8 miles) and Bexhill-on-Sea (9.9 miles).
More on anhydrite screed, part of our screeding services.
