Grades and products for Salisbury apartments and plots
A European standard for screed materials sets the designations used for calcium sulphate. In each one, C is the compressive and F the flexural strength, measured in N/mm2. Light-traffic domestic floors suit CA-C20-F4, everyday residential and office floors CA-C25-F5, and heavier use CA-C30-F6.
For new-build plots, Longhedge Village and Old Sarum among them, the developer's engineer fixes the grade and that is what goes in. If the job needs to dry fast or be thin, the drawings may name an alpha hemihydrate product. Its own product sheet then governs how deep it goes, how it dries and when it can be heated, ahead of any general guidance.
Purpose-built flats make up 17% of Salisbury's homes, and calcium sulphate sits well on apartment floors. Shrinkage is slight as it sets, so big bays go down with few joints over insulation, often with heating too. Some joints are still required, at thresholds and where heating zones divide, and the bay and joint plan is drawn up before the pour.
Converted flats are another matter. At 4% of Salisbury's homes, they sit in older buildings where the floor may be timber or an uneven slab. A flowing screed needs a sound, sealed base, so the structure is checked first, and some converted floors are better served by a thin levelling build-up. For background on the material, read the anhydrite screed guide.
Laitance, moisture and wet areas in Salisbury
Getting the screed in is only part of an anhydrite job. As it dries, a thin and weak layer called laitance forms on top. Unless it is sanded away before adhesive or compound goes down, the flooring ends up stuck to a crust and not the screed. After sanding, the floor takes a primer that is compatible with calcium sulphate.
Next is moisture, measured with a hygrometer. Flooring manufacturers commonly allow calcium sulphate less moisture than cement, so a floor that would pass if it were cement may still hold too much moisture for vinyl or wood. Underfloor heating, where present, can usually help force dry the screed from about 7 days on a gradual schedule.
Calcium sulphate does not belong anywhere wet. Wet rooms, utility areas where leaks are a risk, and any spot where water could pool need a flowing cement screed or a hand-packed sand and cement floor instead. We handle specifications like this for anhydrite floors in Romsey too, with the same sanding, priming and testing.
Anhydrite & Flow Screed prices in Salisbury
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 Salisbury
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 Salisbury
On the map, Salisbury sits west-south-west of Slough, about 59.2 miles from our base in a straight line (postcodes including SP1, SP2 and SP5), next to Amesbury (7 miles), Tidworth (13.1 miles), Verwood (13.5 miles) and Romsey (14.1 miles).
More on anhydrite screed, part of our screeding services.
