RonaScreed SBR (polymer screed admxiture)

RonaScreed SBR is an SBR screed admixture for site batched screeding mortars and fine concretes. The mix design for each is RonaScreed SBR screed admixture, cement, medium grade sharp sand, aggregate as determined by the mix design, plus water. The components are measured by weight or by volume on-site and mixed using forced action mixer to form the screed.

A mixture of RonaScreed SBR and cement achieves monolithic adhesion to correctly prepared concrete or screeds.

RonaScreed SBR screeds are used to lay new screeds and toppings as thin as 10mm bonded. The cured mortar bonds securely to suitably prepared surfaces and are water-resistant.

RonaScreed SBR Mix Designs

Traffic

RonaScreed SBR screeds, toppings and repairs can receive foot traffic after 24-48 hours (typically at 20°C) and after 3-5 days (typically at 20°C) heavy traffic may be allowed.  This time will vary according to temperature, amount of liquid added during mixing, air circulation and other site conditions.

Overlaying with Floor Coverings

The time at which floor coverings can be laid over a RonaScreed SBR screed is dependent on residual moisture content.  Testing for relative humidity (RH) at the surface is an accepted non-destructive means of determining residual moisture content.  Typically, a RonaScreed SBR screed will achieve 75% RH after 10 days air curing at 50mm thickness (at 20°C & 65% air humidity).  Measure RH with a correctly calibrated hygrometer attached to a humidity box, see BS8203.