Description

RonaScreed Self Smoothing Levelling Topping – Wearing screed

RonaScreed Self Smoothing Levelling Topping – Wearing screed. RonaScreed Self Smoothing Levelling Topping is a flow applied protein free floor topping for industrial floors. The material gains strength quickly and can be accessed by foot traffic in 24 hours. RonaScreed Self Smoothing Levelling Topping is suitable for application to concrete floors from a minimum 5mm thickness to a maximum 20mm. Note that when applied thinner than 8mm, substrate imperfections will be evident. For screeds thicker than 20mm, RonaScreed Self Smooth Base may be applied as the initial layer and topped with RonaScreed Self Smoothing Levelling Topping. RonaScreed Self Smoothing Levelling Topping is suitable for wet areas.

Uses

RonaScreed Self Smoothing Levelling Topping is suitable for application to concrete floors from a minimum 5mm thickness to a maximum 20mm. Note that when applied thinner than 8mm, substrate imperfections will be evident. For screeds thicker than 20mm, RonaScreed Self Smooth Base may be applied as the initial layer and topped with RonaScreed Self Smoothing Levelling Topping. RonaScreed Self Smoothing Levelling Topping is suitable for wet areas.

Preparation

The concrete must be mechanically prepared by vacuum shot blasting or scabbling to fully remove laitance and then cleaned to remove contamination, Loose shot and dust should be removed by vacuum cleaning before the process of sealing and priming commences. Pins may be placed in the floor to set out the required levels.

Priming with RonaFloor Epoxy DPM

Priming of the substrate with RonaFloor Epoxy DPM is the preferred priming method. A single coat of RonaFloor Epoxy DPM is usually sufficient to seal the substrate and provide good adhesion. RonaFloor Epoxy DPM should be applied at the rate of 3.3m2/kg and kiln dried sand (grade 8/16 approximately 0.8-1.4mm applied at the rate of 2.5kg/m2) should be scattered into the wet resin. Loose aggregate must be removed by vacuum cleaning before application of RonaScreed Self Smoothing Levelling Topping. RonaFloor Epoxy DPM should be allowed to cure for 18-24 hours @ 200C before loose aggregate is removed.

Priming and Sealing with RonaScreed Self Smooth Primer

Seal the prepared surface by applying one or more coats of RonaScreed Self Smooth Primer diluted with 5 parts water at the rate of 0.62 litres/m². Allow to dry for not more than 36 hours; protect the surface and keep clean.

Note that inadequate sealing will increase the risk of pinholing. Very porous substrates may require the application of two or more coats of sealer. Whilst it is difficult to determine whether a substrate has been sufficiently sealed, a sheen on the surface of the substrate is an indication of adequate sealing.

Prime the sealed surface by applying one coat of RonaScreed Self Smooth Primer diluted with 3 parts water at the rate of 0.71 litres/m². Brush this well into the surface. Apply RonaScreed Self Smoothing Levelling Topping whilst primer is tacky; typically between 2-4 hours after application based on material, ambient and substrate condition of 20°C @ 65%RH.

Mixing/Laying RonaScreed Self Smoothing Levelling Topping – Wearing screed

RonaScreed Self Smoothing Levelling Topping may be applied by pouring or pumping. For pump applications it is recommended that a contractor with the necessary experience to carry out this type of work is used. For poured applications a slow speed drill and helical paddle must be used for mixing and RonaScreed Self Smoothing Levelling Topping should be slowly added to obtain a homogenous mix. For pump application a specialist mixer/ pump must be used. Pump or pour RonaScreed Self Smoothing Levelling Topping onto the prepared and sealed/primed surface and level with a pin rake. Spike rolling is necessary to expel entrapped air and must be completed before the mix begins to gel, to avoid leaving spike marks in the surface. Sanding of the screed surface may be required if resin floor coatings are to be applied. It is recommended that when applying RonaFloor HB100 or RonaFloor HB200, a coat of RonaFloor EWB water based epoxy coating should be applied to RonaScreed Self Smoothing Levelling Topping as a penetrative primer.