CA grades and alpha products for Peacehaven builds
Calcium sulphate screed is ordered by grade. Read the code as two strengths in N/mm2, as the European standard for screeds sets out: the C figure is compressive, the F figure flexural. A house floor with light use gets CA-C20-F4, the general grade for homes, flats and offices is CA-C25-F5, and CA-C30-F6 takes heavier traffic. Whatever the drawings for a Peacehaven plot or block say, that is the grade we pour.
Homes built from 2000 to 2014 make up 9% of the town, with more since. What makes it attractive for new plots and flats is how little it shrinks, which lets big bays go down with only a few joints, on insulation or over heating pipes. The bay and joint layout, across door thresholds and between heating zones, is planned before the pour so nothing is left to guesswork.
An alpha hemihydrate product turns up on some specifications. Specifiers choose one when the floor must dry quicker or be shallower, and its own product sheet then sets the thickness and drying, which is what we go by.
Everything under the pour is laid by our own crew. If calcium sulphate is wrong for a room, a flowing screed made with cement is available as the alternative. To read more about the material, try our anhydrite guide. If the need is simply a fast, level pour for an extension rather than a written specification, the liquid screed option is usually the simpler route.
Before flooring goes onto a Peacehaven anhydrite floor
Finishing matters as much as pouring. Calcium sulphate leaves a thin, weak film of laitance on its surface as it dries, and flooring adhesive does not stick to it. When the screed is dry enough, we sand that film off and prime the surface with a primer designed for calcium sulphate. That is the step that stops tiles, LVT and wood from lifting later.
Moisture is the other test. The floor also has to be drier than most people assume, as flooring manufacturers commonly hold calcium sulphate to a tighter moisture limit than cement. We use a hygrometer and check the reading against the flooring maker's figure. With heating pipes in place, warming the floor to force dry it can normally begin from about 7 days and brings the date forward.
Keep calcium sulphate out of any room where water could get onto the floor. A shower room or utility on a new plot takes a cement based flowing screed, or a hand-laid sand and cement screed in Peacehaven where falls to a drain are needed. Where an older anhydrite floor has been damaged, our screed repairs service covers the fix.
Anhydrite & Flow Screed prices in Peacehaven
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 Peacehaven
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 Peacehaven
As the crow flies, our yard in Slough is about 58.1 miles from Peacehaven, which lies to the south-south-east. Postcodes here include BN10, and Newhaven (2 miles), Seaford (4.7 miles), Lewes (5.4 miles) and Brighton and Hove (6.7 miles) are close by.
More on anhydrite screed, part of our screeding services.