Cement replacement system for rapid drying screeds


RonaScreed Rapid is a cement replacement for rapid drying screeds used when laying bonded, unbonded or floating screeds prior to the application of floor coverings such as LVT, carpet, timber, resin coatings and tiles. The fast drying properties allow screeds to be covered with moisture-sensitive finishes as early as one day after application.
RonaScreed Rapid may be used in residential and commercial environments, including shops, schools, factories, garages, leisure facilities, etc and is suitable for internal and external applications. RonaScreed Rapid does not produce a wearing screed, it is designed to be covered with a floor finish.

RonaScreed Rapid Mix Designs

RonaScreed Rapid20kg20kg20kg
0/8mm sand80kg110kg140kg
Water additionSee note belowSee note belowSee note below
Yield per mix0.05m30.06m30.08m3
Water addition will depend on the sand water content. To test for correct consistency a ball should be made of the mortar, squeezing of the ball should not produce free liquid. When the ball is pulled apart it should separate in two pieces without crumbling.

Performance data of RonaScreed Rapid mix designs

Foot traffic2-3 hours2-3 hours3-4 hours
Apply floor tiles after3 hours3 hours4 hours
Apply resilient flooring after24 hours24 hours36 hours
Compressive strength (28 days)50N/mm238N/mm225N/mm2
Flexural strength (28 days)11N/mm28.5N/mm26N/mm2
The data is based on drying @ 20°C and 60±5% relative humidity. Low temperature, high humidity, and changing the mix design will delay drying. The relative humidity (RH) at the surface of the screed should be measured with a hygrometer, as required by BS 8203 Annex B, before proceeding to lay floor coverings.

    Quick Question?

    Our Product range

    RonaScreed FastDry Prompt – benefits and drying

    RonaScreed FastDry Prompt (formerly RonaScreed 8 Day Overlay) is so-called because it is a fast-drying screed additive which enables a 50mm thickness of 3:1 sand/ cement screed to be overlaid with moi ...

    Read more

    Drying of Screeds

    BS 8204-1 “Concrete bases and cementitious levelling screeds to receive floorings — Code of practice” section 6.11.1 suggests the following calculation for drying of screeds with no fast drying additi ...

    Read more

    Avoidance/ Mitigation Of The Effects Of Common Forms Of Cracking In Cementitious Screeds

    Aggregate is usually 0–4 mm and is mixed with cement in the ratio of 1:3 or 1:4 cement to sand, depending on strength requirements and drying requirements. For total screed thicknesses in excess of 50 ...

    Read more

    Here to help...

    Click here to minimise.