Choosing the calcium sulphate grade for Faversham plots
The grade on a specification is not a label to skip over. Each CA code carries two numbers in N/mm2 under the European screed standard: after the C, compressive strength; after the F, flexural strength. Light domestic use is what CA-C20-F4 is for. Apartments, offices and most houses sit at CA-C25-F5. CA-C30-F6 is for heavier use, where a floor will take more load or footfall.
Alpha hemihydrate products are a different family within calcium sulphate. Specifiers pick them when drying time or depth is tight, say a floor kept shallow so an old threshold still works, and each one is laid to its own product sheet instead of a general rule.
Calcium sulphate barely shrinks while it cures. That lets it be laid in large bays with far fewer joints than a cement screed, which is why it is specified for open ground floors and repeated apartment layouts. Bays and joints are still set out before pouring, with doorways and the edges between heated and unheated areas getting particular attention.
Purpose-built flats make up 11% of homes here, and flat floors bring their own demands: acoustic layers under the screed, fixed programme dates and a finish ready for the next trade. If the build is a single house, our Faversham liquid screed page covers the pump and access side. The material gets a longer treatment in our anhydrite screed guide.
Laitance, moisture and primers before Faversham flooring
What happens after the pour is where calcium sulphate differs most. While it cures, a weak, thin crust called laitance builds up on the surface. That crust has to go, normally sanded off once the floor has dried, otherwise adhesive or compound ends up stuck to something that can lift. At handover we leave you written notes on drying and laitance.
Moisture testing comes next. Floor covering makers often set calcium sulphate a stricter dampness limit than cement, so a figure that would pass on cement may fail here. Only a hygrometer settles it; with heating in, drying can be pushed along from about 7 days.
Only then, with the laitance gone and the reading passed, does a primer go on, and the primer chosen must suit a calcium sulphate base. Our floor levelling team can prime and apply compound where the finish needs a smoother surface.
One caution applies to any wet area. Calcium sulphate is wrong for wet rooms, garages or any floor water can reach; for those, pour a flowing mix bound with cement, or lay a bonded cement screed over a sound slab.
Anhydrite & Flow Screed prices in Faversham
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 Faversham
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 Faversham
As the crow flies, our yard in Slough is about 68.1 miles from Faversham, which lies to the east. Postcodes here include ME13, and Whitstable (6.5 miles), Sittingbourne (7 miles), Canterbury (8.5 miles) and Herne Bay (10.9 miles) are close by.
More on anhydrite screed, part of our screeding services.
