Anhydrite grades for Tewkesbury Garden Town plots
The Tewkesbury Garden Town target of more than 10,000 homes around Tewkesbury and Ashchurch, including the proposed 2,800 homes at North Ashchurch, means a lot of plots built to a written floor specification. Many will name a calcium sulphate grade under the BS EN screed standard.
Read each grade as two strength figures in N/mm2: C for compression, F for bending. CA-C20-F4 suits domestic rooms with light traffic. The usual choice for most homes, apartments and offices is CA-C25-F5, while CA-C30-F6 is kept for heavier use. Purpose-built flats make up 15% of Tewkesbury's homes, and apartment floors are often specified at CA-C25-F5.
Where a floor must dry sooner or sit thinner, the drawings may call for alpha hemihydrate, with depth and drying set by that product's data sheet.
Shrinkage is minimal with this material, so large open areas can be poured with hardly any joints. Bays and joints are worked out before pouring, and our team puts down the layers beneath, from insulation and membrane to the edge strip. How anhydrite screed works covers the material itself.
Where a floor may get wet, including ground floors with a flood risk and utility or shower areas, a cement based flowing screed or a hand-laid sand and cement screed in Tewkesbury is the right material instead.
Laitance and moisture testing on Tewkesbury floors
As the floor dries, a thin, weak surface layer called laitance forms on top. Adhesive and levelling compound cannot hold onto that skin, so it gets sanded away once the floor has dried, leaving the sound screed underneath exposed. A primer suited to calcium sulphate follows, because some cement based primers and adhesives do not suit it.
Testing for moisture is more critical than on a cement floor. Adhesive and flooring makers tend to set a tighter moisture limit for calcium sulphate than for cement, so a reading that would pass on a cement floor can still be too damp to tile here. The check that counts is a hygrometer reading set against the figure in your flooring maker's instructions, taken before anyone orders the adhesive.
Drying can be helped along. Over underfloor heating, warming the floor from about 7 days, raised gradually, can speed the drying. Our written handover covers drying and laitance so your flooring fitter is not caught out.
If sanding and priming are needed separately, our floor preparation service covers it. For a project in Stroud, see anhydrite screed in Stroud.
Anhydrite & Flow Screed prices in Tewkesbury
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 Tewkesbury
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 Tewkesbury
On the map, Tewkesbury sits west-north-west of Slough, about 72.3 miles from our base in a straight line (postcodes including GL20), next to Cheltenham (7.2 miles), Gloucester (9.6 miles), Evesham (11.3 miles) and Stroud (17.3 miles).
More on anhydrite screed, part of our screeding services.
