Grades and products for Rickmansworth apartment floors
On a Rickmansworth flat drawing, the anhydrite will be written as a short string of letters and numbers set by the European materials standard for screeds. After CA, the C number tells you how hard it resists crushing and the F number how well it resists bending, both quoted in N/mm2. Almost all housing work uses one of three. Bedrooms and other quiet domestic rooms manage on CA-C20-F4. CA-C25-F5 is the standard pick for most homes, apartments and offices. Shared hallways and similar busy areas in a block move up to CA-C30-F6.
Whoever designed a Rickmansworth block or plot, engineer or architect, picks the grade, and that is what goes in the pump. If a thin section or speed is the priority, the spec may call for an alpha hemihydrate product, which has its own product sheet for minimum depth and drying, and we follow it.
Flats suit the material because it barely shrinks while curing. Wide open areas go down as single bays with few joints, and in an open-plan flat the joints may only be needed at door thresholds or where heating zones meet. Our own team sets out the bays and joints in advance and prepares the whole build-up. Since only 12% of Rickmansworth homes date from 2000 or later, the base under a pour is as likely to be old as new, and any work it needs first falls under our floor preparation service.
Anyone curious about how a calcium sulphate binder behaves as it sets can read anhydrite screed explained.
Laitance, moisture and primers before Rickmansworth floors are finished
Dry to the touch does not mean ready for flooring with calcium sulphate. Curing leaves a soft film, the laitance, across the top. Glue and compound hold poorly on that film, so once the floor is dry enough we sand it back to firm material. A primer made for calcium sulphate goes on next, since some cement based adhesives react badly with the material.
Then comes moisture. Flooring makers are usually stricter with anhydrite than with cement, so a reading fine for one can fail the other. We take hygrometer readings instead of counting days. Where a block's flats have heating loops in the floor, switching them on gently from about day 7 speeds the drying along.
Water is its weak point. Any Rickmansworth bathroom with a walk-in shower, a full wet room, or a utility space where plumbing might one day leak, is better poured in a cement based flowing screed. The other option there is a hand-laid cement screed for wet areas, which also lets us form falls. The same material is poured nearby as anhydrite flow screed in Amersham.
Anhydrite & Flow Screed prices in Rickmansworth
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 Rickmansworth
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 Rickmansworth
On the map, Rickmansworth sits north-east of Slough, about 10.6 miles from our base in a straight line (postcodes including WD3), next to Chorleywood (2.5 miles), Watford (3.4 miles), Bushey (4.5 miles) and Harrow (6.3 miles).
More on anhydrite screed, part of our screeding services.
