Short answer: for a traditional sand and cement screed, plan on 1 day of drying per millimetre, so a 50 mm screed needs about 50 days, and then lay the Karndean only after a moisture test passes. Karndean is a moisture-sensitive luxury vinyl covering, and its adhesive bond fails on a damp screed, so the
How Long for Screed to Dry Before Karndean? [Guide 2026] Read More »
Short answer: traditional floor screed is a semi-dry sand and cement layer, usually mixed 1:4 by volume, laid over a concrete slab to give a level base for the floor covering. Its thickness is set by how it is built, not by preference: BS 8204-1 gives 25 mm as the minimum for a bonded screed,
Traditional Floor Screed: The Perfect Foundation for Your Flooring Needs Read More »
Short answer: a quick drying screed is ready to cover when it passes its moisture test, not when you can walk on it. Walk-on time, light traffic time and covering time are three different milestones on the product data sheet, and only the covering figure sets your programme. The 1 day per millimetre rule for
Quick Drying Floor Screed: Why Quick Drying Floor Screed is Every Builder’s Choice Read More »
Screeding sand is sharp sand, not soft building sand. A floor screed is sharp sand mixed with cement and water, most commonly at 1 part cement to 4 parts sand by volume, laid to a thickness that depends on how it is constructed, then dried and tested before any covering goes down. Soft building sand
Screeding Sand and Floor Screed: A Guide to Different Types, Cost, & Cracked Sand Screed Read More »
Fibres in a screed control shrinkage cracking, they do not turn a screed into a structural slab. Synthetic or steel fibres spread through the mix hold micro-cracks closed and improve tensile and flexural strength, which is why fibre screed can replace light crack-control mesh in many domestic floors. They do not replace reinforcement where a
Fibre Reinforced Screed: An In-Depth Guide to Thickness, Cost, and More Read More »
Gypsum-based screed, also called calcium sulphate screed, is chosen for flatness and speed, not for early covering. It flows level, suits underfloor heating, and can be walked on in about 24 to 48 hours, but that is not the same as being ready to cover. Cover it only after a moisture test passes, lay it
Gypsum-Based Floor Screed: An Ultimate Guide Read More »
Most floor screed problems are not bad luck, they are a number missed at specification time or at covering time. Screed laid too thin cracks, screed covered while still damp lifts its finish, and screed dried too fast crusts on top while moisture stays underneath. This article lists the pros and cons, but the checks
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Choose by how the screed must behave, not by speed alone. A bonded screed becomes part of the slab, so it is thin and follows the slab, faults included. An unbonded screed sits on a separating membrane and moves independently of the slab, so it needs more thickness to span on its own. Floating screed
Bonded Screed vs Unbonded Screed: Which is Better for Your Project? Read More »
Decide on calcium sulphate screed by its limits, not its speed. It flows flat, suits underfloor heating, and reaches foot traffic quickly, but it is not ready to cover in 24 to 48 hours: that is roughly when it can be walked on, not when it tests dry. Cover it only after a moisture test
Calcium Sulphate Screed: Pros and Cons Read More »
Choose by the job, not by the product. Wet screeding levels fresh concrete in the same pour, so it suits new slabs where cost and speed matter most. Dry screeding, a self levelling topping laid over a cured slab, suits existing floors and commercial jobs where flatness tolerance matters more than price. If the slab
Wet Screed vs Dry Screed – Which Is Better for Your Project? Read More »
Most anhydrite screed problems come back to three causes: moisture left in the screed, laitance left on the surface, and a screed laid too thin or on a badly prepared base. Get those three right and most of the cracking, debonding, hollow spots and covering failures described below never happen. The rest of this article
Anhydrite Screed Problems – Things to Consider Read More »
Screed is ready to cover when it tests dry, not when the calendar says so. As a planning rule, allow 1 day of drying per millimetre of thickness for a traditional sand and cement screed at around 20 degrees C with good ventilation, so a 50 mm screed plans at about 50 days before testing.
How to Dry Screed Quickly: A Comprehensive Guide Read More »
Anhydrite screed, also called calcium sulphate screed, is a pumpable, self levelling floor screed that suits underfloor heating well because it flows around pipes and conducts heat efficiently. Its two non negotiable rules are moisture and laitance: the screed must be dry enough, tested properly, before it is covered, and the weak laitance skin on
Depth and finish decide this choice. Cement screed builds a new floor base, typically 25 mm to 40 mm thick, and takes weeks to dry before it can be covered. Microcement is a decorative finish in its own right, laid only a few millimetres thick over a sound existing surface, and ready far sooner. If
Cement Screed vs Microcement – Which Is Better for Flooring? Read More »
Screed and mortar are not interchangeable, even though both are cement based. Screed is a levelling layer laid horizontally over a floor slab to give a flat surface for a floor covering. Mortar is a bonding paste laid between bricks, blocks or stones to hold masonry together and carry load. If the job is a
What’s the Difference Between Screed and Mortar? Read More »
