Reading an anhydrite specification for Burgess Hill plots
Read a grade such as CA-C25-F5 from left to right: CA for calcium sulphate, then compressive strength after the C and flexural strength after the F, both given in N/mm2. Light domestic use calls for CA-C20-F4, the bulk of homes, apartments and offices for CA-C25-F5, and heavier use for CA-C30-F6.
On new-build plots the specification usually comes from the developer's engineer, and we pour the grade named rather than substituting another. Where the drawings want quicker drying or a thinner floor, they may name an alpha hemihydrate product. That product's own data sheet then sets the depth, drying times and heat-up, and we stick to it.
Because it hardly shrinks while setting, the material can go down in big bays. Only a few joints are needed, a good fit for open-plan ground floors and apartments. We still put joints at thresholds and where heating zones meet, and agree their positions with you before pumping.
The same material choices apply when a newer house is altered later. If a Burgess Hill home built in the last twenty years has a calcium sulphate floor, an extension can match it, and the drying and testing rules below apply to both. The material is explained at more length in our guide to anhydrite. For the general pumped-screed approach, read liquid screed in Burgess Hill.
Laitance and moisture checks on Burgess Hill anhydrite floors
While it dries, the screed develops laitance, a weak surface skin. It must be sanded off before flooring, because adhesive stuck to laitance can let go. We then vacuum up the dust and prime with a product designed for calcium sulphate.
Moisture is checked with a hygrometer before any flooring goes down. Flooring makers commonly allow less moisture in calcium sulphate than in cement, so this floor has to dry further than a sand and cement one would. With heating pipes in the floor, the system can usually force dry it from about 7 days, turned up gradually.
Water is its weakness, so think about which rooms could ever get wet. In a wet room, a shower area or a utility where leaks could happen, use a cement based flow screed, or a hand-laid cement screed laid to falls.
Where a finished anhydrite floor turns out uneven, it can be primed and levelled with a compound compatible with calcium sulphate. For the same specification work in a nearby town, see anhydrite screed in Crawley.
Anhydrite & Flow Screed prices in Burgess Hill
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 Burgess Hill
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 Burgess Hill
On the map, Burgess Hill sits south-south-east of Slough, about 45.5 miles from our base in a straight line (postcodes including RH15 and BN6), next to Haywards Heath (3.1 miles), Lewes (8.5 miles), Brighton and Hove (9.2 miles) and Southwick (9.6 miles).
More on anhydrite screed, part of our screeding services.
