CA grades for Wimborne Minster apartments and plots
Look at the screed line on a Wimborne Minster flat or plot specification and you will see a CA code from the European standard for screed materials. The number after C is crushing strength and the number after F is bending strength, both in N/mm2.
A bedroom or study floor in a Wimborne home could use the lighter CA-C20-F4. CA-C25-F5 covers most homes, apartments and offices, so expect to see it on the drawings for a Wimborne flat or house plot. Floors under harder wear step up to CA-C30-F6.
Whatever grade the engineer has drawn for a plot is the grade that turns up on the day. If a quicker dry or a slimmer floor is wanted, the designer may name an alpha hemihydrate product. These have their own product sheets for depth and drying, and we follow the sheet.
The material has real advantages for flats. Because it hardly shrinks, an entire flat can often go down as a single bay, with joints only across doorways or where heating zones meet. That layout is agreed before the pour, so the flooring fitter knows where the movement joints will fall. If pipes run through it, the heating can usually help it dry from around day 7.
In converted flats in older buildings, the existing structure needs checking first. Getting that base ready falls under our subfloor preparation work. There is more on the material in our anhydrite primer.
Laitance and moisture on Rivers Edge and Wimborne Chase floors
Two steps separate a finished anhydrite floor from one that fails under the flooring. On new homes at Rivers Edge and Wimborne Chase, where heated floors are common, both have to be timed around the heating being commissioned.
First, laitance. Drying leaves a fragile film called laitance across the surface. Adhesive, levelling compound and tile mortar will not grip it. When the readings allow, we sand that film away, clear the dust and seal the floor with a primer that suits calcium sulphate.
Second, moisture. Flooring makers often want calcium sulphate drier than they would a cement base. A hygrometer gives the reading, we check it against your flooring brand's figure, and you get our drying and sanding advice on paper. So a number that would let tiles go onto cement can still be a fail on anhydrite, and counting days is no substitute.
Keep anhydrite out of anywhere water might sit. In a flat's shower room, a wet room or a utility where a leak is possible, we would pour a cement based flowing mix or lay hand-finished sand and cement. We pour this material in Christchurch as well.
Anhydrite & Flow Screed prices in Wimborne Minster
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 Wimborne Minster
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 Wimborne Minster
On the map, Wimborne Minster sits south-west of Slough, about 77.2 miles from our base in a straight line (postcodes including BH21), next to Ferndown (4.3 miles), Bournemouth (7.3 miles), Verwood (7.4 miles) and Ringwood (9.2 miles).
More on anhydrite screed, part of our screeding services.
