Specifying CA grades for Evesham flats and plots
Every calcium sulphate screed grade has a three-part name. CA means calcium sulphate. After C comes compressive strength, and after F flexural strength, each in N/mm2.
Lightly used domestic floors take CA-C20-F4. Houses, apartments and offices generally get CA-C25-F5. Where use is heavier, specifiers ask for CA-C30-F6. Over-specifying adds cost for no benefit, while under-specifying risks a surface that marks or cracks. When the drawings for a block or a plot name one of these, that is the grade poured, with the bay and joint layout planned in advance.
Purpose-built flats are 14% of Evesham's homes, and apartment floors are a common setting for this material. It pumps easily to upper levels, lays thin over acoustic or thermal insulation, and shrinks so little that long corridors and open-plan flats need few joints.
New houses are the other setting. With 13% of the town's homes built since 2015, plots on recent developments are the sort that often carry a calcium sulphate specification over underfloor heating.
When drying speed or a thinner section is the priority, an alpha hemihydrate product may be picked, and its depth and drying come from that maker's own data sheet. The build-up underneath is prepared by the same K & B team that pours. More on the material itself is in our anhydrite screed guide.
Keeping calcium sulphate dry near the River Avon
Calcium sulphate screed performs well in dry rooms and poorly where water sits. In Evesham, that makes the location of the floor part of the specification. A ground floor in an area with a flood history, a utility room or a wet room should use a cement based flowing screed or traditional sand and cement instead.
Once a calcium sulphate floor is laid, three steps come before the covering. The laitance, a weak skin that forms on the surface as it cures, is sanded off when the screed is dry. Next, a hygrometer reading, because flooring makers often allow less moisture in calcium sulphate than in cement, and that reading, not the calendar, sets the flooring date. Where heating pipes run through it, the system can usually speed drying from about 7 days.
Last comes a primer made to suit calcium sulphate, applied before adhesive or compound touches the floor. If a levelling layer is needed, see levelling Evesham floors. The same specification work is available about 14 miles away as anhydrite screed in Cheltenham.
Anhydrite & Flow Screed prices in Evesham
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 Evesham
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 Evesham
As the crow flies, our yard in Slough is about 67.9 miles from Evesham, which lies to the north-west. Postcodes here include WR11, and Tewkesbury (11.3 miles), Stratford-upon-Avon (12.4 miles), Cheltenham (14.4 miles) and Redditch (14.8 miles) are close by.
More on anhydrite screed, part of our screeding services.
