CA grades on Market Harborough new-build plots
Each calcium sulphate screed carries a code under the European screed material standard. In that code, C gives compressive strength and F gives flexural strength, measured in N/mm2. Three grades cover most housing. CA-C20-F4 covers lightly used domestic floors. CA-C25-F5 fits the bulk of houses, flats and offices. CA-C30-F6 goes where the floor will take more wear. For plots at Rockingham View, the developer's engineer sets the grade, and that exact grade is what we pour, with no near equivalents. If the drawings are unclear on the grade, we ask the engineer before booking the pour. Some plot drawings call up an alpha hemihydrate product. Those are picked for quicker drying or a thinner floor, and their depths and drying times are taken from each product's own data sheet. Calcium sulphate barely shrinks while it sets. So bays can be big and joints few, which works for open ground floors in new houses and for flats. Flats in purpose-built blocks account for around 11% of Market Harborough homes, and one apartment's floor there can often be poured in a single visit. Some joints are still required, at certain doorways and where heating zones meet, so the layout is drawn up before pouring. Our guide anhydrite screed explained goes into how the material behaves.
Laitance and moisture checks on Market Harborough floors
While calcium sulphate dries, a thin, weak skin known as laitance forms on top. That skin must be sanded away before adhesive or levelling compound is applied, otherwise the flooring is bonded to a crust rather than the screed. When the screed has dried enough we sand it, then prime it with a calcium sulphate primer, as some primers made for cement react badly with this material. Moisture testing comes next. Plenty of flooring makers want anhydrite drier than a cement floor, so a reading that would pass for tiles on cement can fail here. Readings come from a hygrometer, not a count of days. If underfloor heating is in, it can normally help force dry the floor after about 7 days. The material has one clear limit: it does not belong where the floor may stay wet. Utility rooms that could flood and wet rooms need a cement based flowing screed instead, or a hand-laid sand and cement floor for wet areas. If a commercial unit needs something harder wearing, see our commercial screeding service.
Anhydrite & Flow Screed prices in Market Harborough
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 Market Harborough
K & B Screeding’s own team, led by director Donatas Bardisevicius. Founded 2019, company 12298780.
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Anhydrite & Flow Screed from Slough to Market Harborough
Market Harborough is about 66.6 miles north of our Slough base as the crow flies, with postcodes including LE16. The nearest towns to it are Desborough (5 miles), Corby (9.4 miles), Kettering (9.9 miles) and Lutterworth (11.8 miles).
More on anhydrite screed, part of our screeding services.