What a Yateley specification means by its CA grade
The code on your drawing is shorthand from the European screed standard. The letters CA identify the binder. The figure after C gives compressive strength, the one after F gives flexural strength, and both are in N/mm2.
A home floor with light wear needs nothing more than CA-C20-F4. Houses, apartments and offices mostly get CA-C25-F5, and floors working harder need CA-C30-F6. If your plans state a grade, that grade is what the pump delivers. Leave it blank and we will ask how the floor will be used, then suggest one.
Alpha hemihydrate screeds sit in a separate group, used when quicker drying or a shallower floor is the goal. Each product's own data sheet tells us how thin it can go, how long it takes to dry and when it can be heated, and we work to that sheet.
Compared with cement, this material barely moves as it cures. Shrinkage is so low that large bays go down with few joints, which is why it suits open-plan ground floors and apartments. Where the bays and joints go is still decided before the pour, with doorways and the boundaries between heating zones getting the most attention.
New housing is thin on the ground in Yateley: 4% of homes were built from 2015 on. A calcium sulphate specification is therefore most likely on a new plot or a block of flats, though some bigger extensions call for it too. For more on the material, see our explainer on anhydrite screed; the grades are identical for calcium sulphate screed in Fleet.
Laitance, moisture and primers on Yateley floors
A drying calcium sulphate floor forms a soft, weak crust on top, and that crust is called laitance. Adhesive must never go onto it, so when the floor has dried sufficiently the skin is sanded off and the dust vacuumed up. Leave it and tiles, LVT or wood may work loose. That work is part of our preparing floors for new finishes service.
Moisture comes next. Plenty of flooring manufacturers are stricter about moisture in calcium sulphate than in cement, so your test result has to be read against the figure from the maker of your flooring. Running the underfloor heating from about 7 days can force dry the screed and cut the wait, but nothing is laid until the reading is within that limit.
Primer is the last step before adhesive, and it has to be one made for calcium sulphate. If the floor also needs a skim of levelling compound, the primer goes on before that too.
Where a floor might get wet, calcium sulphate is ruled out. Bathrooms with a shower, wet rooms and utility rooms that could suffer a leak should have a flowing mix with a cement binder.
Anhydrite & Flow Screed prices in Yateley
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 Yateley
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 Yateley
As the crow flies, our yard in Slough is about 15.2 miles from Yateley, which lies to the south-south-west. Postcodes here include GU46 and GU17, and Sandhurst (0.8 miles), Crowthorne (2.3 miles), Camberley (3.2 miles) and Frimley (3.8 miles) are close by.
More on anhydrite screed, part of our screeding services.
