FREQUENTLY ASKED QUESTIONS

What is the minimum screed thickness?

In general, the screed thickness can vary from 25mm to 200mm. However, this is purely dependent on the type of screed used as self-levelling screed can be applied at a much lower thickness than 25mm. For more detailed information, please visit our different screed services.

What is screed?

As outlined by the BS EN 13318: Screed is a layer of material laid directly onto a concrete base either bonded, unbounded, floating or over underfloor heating. Traditional screed is a material consisting of cement and sharp-sand at a ratio of 1:4.

How much screed is needed?

The amount of screed needed depends on the size of the area and the depth of screed that is required. For a quick calculation, please visit our technical page and use the Screed Calculator.

How long does it take for screed to dry?

Generally, traditional screed dries at 1mm per day up to 40mm and anything thicker than 40mm dries at 0.5mm a day. However, there are additives that allowfull traffic after 7 days.

How do you mix screed?

For smaller areas, screed can be mixed by a forced action mixer. For larger areas, screed is mixed via a screed pump.

Traditional screed vs Flowing screed?

Traditional ScreedFlowing Screed
A much dryer non-liquid consistencyFast application e.g. Our team applied 600m2 of flowing screed in 5 hours
Can be applied between 25mm and 200mm depending whether it’s bonded, unbonded, floating or modifiedIdeal for application over underfloor heating systems
Can have full foot traffic after 7 days with the use of additives. Otherwise, it dries at 1mm a day up to 40mm and after that 0.5mm a dayFast drying times – can dry in 7 days
Not as strong as flowing screed however, it can be reinforced using polypropylene fibres (PPF) or a D49 metal meshStronger than traditional screed allowing thinner application
Due to thinner thickness, it is lighter in weight