Reading anhydrite grades for Bracknell apartments and plots
The grade on a drawing tells you two numbers. Take CA-C25-F5. C stands for compressive strength and F for flexural, with both figures in N/mm2. Lightly used domestic rooms get by on CA-C20-F4. Most houses, apartment blocks and offices are written up as CA-C25-F5, and floors that take more punishment get CA-C30-F6. Whatever the drawing says is what goes in; we never substitute a cheaper grade.
Alpha hemihydrate screeds are different products altogether, picked when a floor must dry sooner or go down thinner than normal. Each comes with a manufacturer's sheet fixing depth and drying, and that sheet, not a rule of thumb, is what we work to.
As it cures, calcium sulphate barely shrinks. That lets it be laid in large bays with fewer joints, which suits apartment floors and open ground floors on new build plots. We draw up where the bays and joints go before the pour, and the layers beneath are put down by our own people.
12% of Bracknell's homes were built between 2000 and 2014, and newer plots, such as those planned at Amen Corner, are the kind of project where a housebuilder may call for a CA grade over insulation and heating. When the heating is part of the specification, see underfloor heating screed in Bracknell. For the material itself, our anhydrite screed explained guide goes into more detail.
Laitance, moisture tests and wet areas in Bracknell
A set calcium sulphate floor still has two jobs waiting. While it cures, a thin and weak skin called laitance rises to the top, and that skin must go. We wait for the floor to dry, sand the laitance off, then prime with a primer meant for calcium sulphate. Skip the sanding or the primer and tiles or vinyl are liable to let go later.
Damp needs closer watching here than on cement too. Flooring makers often allow calcium sulphate less moisture than cement screed before their products go down, so we take a hygrometer reading and hold it up against your covering maker's figure first. Force drying with the heating is usually possible from around day 7, useful on a Bracknell block or plot working to a handover.
Water is its weak point. Bathrooms, wet rooms and areas exposed to water call for a cement based flowing screed instead, which pumps the same way but tolerates moisture. We will point out those rooms on the drawings. If you are pricing plots across the area, we also lay anhydrite flow screed in Sandhurst.
Anhydrite & Flow Screed prices in Bracknell
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 Bracknell
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 Bracknell
On the map, Bracknell sits south-south-west of Slough, about 9.2 miles from our base in a straight line (postcodes including RG12 and RG42), next to Wokingham (3.5 miles), Crowthorne (3.8 miles), Sandhurst (5.3 miles) and Camberley (5.4 miles).
More on anhydrite screed, part of our screeding services.
