Grades and products on a Reigate screed specification
Each calcium sulphate screed carries a short code defined by the European screed standard. The CA stands for calcium sulphate, the figure after C gives compressive strength and the one after F gives flexural strength, measured in N/mm2. On a Reigate drawing you will usually see one of three: CA-C20-F4 for lightly trafficked domestic rooms, CA-C25-F5 for the general run of domestic and office floors, and CA-C30-F6 where the floor works harder.
Whatever grade the specification states is the grade that arrives in the truck; we never swap it for something else. An architect who picks an alpha hemihydrate product has normally done so for speed of drying or a thinner section, perhaps on a cramped extension or a floor short of height. Its data sheet then decides depth and drying times, and we follow the sheet.
What makes the material practical is how little it shrinks. Wide areas go down in a few big bays with hardly any joints, a good fit for long ground floors and flats laid out open plan. Some joints remain necessary, at certain doorways or where heating zones meet, so the bay layout is drawn up before pour day.
Flats suit it well. Purpose-built flats make up 22% of Reigate's homes, and an apartment floor is usually a wide, single level area over insulation, often heated, poured in one visit. Our guide to anhydrite screed explains the material further, including how it differs from the cement based flowing screeds.
Sanding, priming and testing Reigate anhydrite floors
As calcium sulphate dries, a fine layer called laitance forms on top. That skin is soft, and glue cannot be relied on to hold to it, so we sand it away once drying has gone far enough and then apply a primer designed for calcium sulphate.
Moisture is checked with a hygrometer. Wood and LVT manufacturers often set a stricter moisture limit when the base is calcium sulphate rather than cement, so a Reigate floor can look and feel dry yet still be too damp for them. Underfloor heating, if there is any, can normally be run from about 7 days to speed the drying.
It is the wrong choice where a floor may get wet. Anywhere water could sit, such as a utility with a leaking washer or a wet room, should have a flowing screed based on cement or a traditional screed laid by hand. If the base needs work before any screed goes down, see our floor preparation service. You also get written guidance on laitance and drying, so your floor layer can see what was done and on which date.
Anhydrite & Flow Screed prices in Reigate
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 Reigate
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 Reigate
As the crow flies, our yard in Slough is about 27.8 miles from Reigate, which lies to the south-east. Postcodes here include RH2, KT20 and RH1, and Redhill (1.5 miles), Horley (4.9 miles), Dorking (5.4 miles) and Caterham (6.3 miles) are close by.
More on anhydrite screed, part of our screeding services.
