RonaScreed Renovation Screed extended information
Estimating Guide
RonaScreed Renovation Screed
1.7kg/m²/mm (1 x 20kg unit will cover approximately 2.35m² at 5mm thick)
Sealing & Priming
Refer to RonaScreed Primer technical data sheet.
RonaScreed Renovation Screed Performance Data
Water addition per 20kg | 4.0—4.4 litres |
Working time @ 20°C | 20-30 minutes |
Foot traffic @ 20°C | 2 hours |
Application thickness | 2mm to 50mm |
Overlay times @ 20°C | |
2-10mm thickness | 24 hours for floor coverings |
50mm thickness | 72 hours for floor coverings |
3mm thickness | 3mm thickness |
The screed must achieve a compressive strength of at least 25N/mm² before the application of a resin floor finish. | |
Compressive strength | |
1 day | >15N/mm² |
7 day | >23N/mm² |
28 day | >35N/mm² |
Flexural strength | |
1 day | >3N/mm² |
7 day | >5N/mm² |
28 day | >7N/mm² |
Results shown are from samples mixed, conditioned and tested in ideal laboratory conditions (20oC, 65% RH). Site results will be lower. Drying times may be longer. When opening to foot traffic do not subject to potential impact damage for 14 days.
Achievable Surface Finish
Due to the nature of the product the risk of air bubbles, pinholes and surface undulations cannot be entirely eliminated. Correct substrate preparation, effective sealing and priming and correct mixing/ application will provide optimum results. It is recommended that a Ronacrete Approved Contractor should be employed. The presence of surface imperfections will not impair the performance of the product.
RonaScreed Renovation Screed Substrate Preparation
Concrete/screed
The concrete or screed 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.
Ceramic, porcelain and quarry tiles
Ensure all tile surfaces are clean and dry. All tiles are to be firmly bonded, any loose tiles to be removed and the area repaired with a suitable Ronacrete repair mortar. RonaScreed Feather Finish is to be used to fill grout joints to level the surface prior to priming and applying RonaScreed Renovation Screed.
Flooring Grade Asphalt
The surface is to be secure, clean and free from dirt and other contamination. The minimum application thickness of RonaScreed Renovation Screed over flooring grade asphalt is 3mm, the maximum thickness is 6mm.
Vinyl Tiles
All tiles are to be secure and well adhered to the substrate. The surface is to be clean, dry and free from contamination.
Underfloor Heating
Underfloor heating must be switched off 48 hours before and after application of RonaScreed Renovation Screed. When switching on, commence with low temperature and gradually increase at 5ºC per day up to maximum operating temperature.
Under-tile Heating
RonaScreed Renovation Screed may be used to encapsulate undertile heating systems over plywood, up to a maximum thickness of 10mm.
Floorboards and T&G Flooring
All boards must be mechanically fixed by screw fixings to the supporting structure at maximum 150mm centres. The substrate is have sufficient strength to support the underlayment screed and final floor finish. RonaScreed Feather Finish is to be used to fill joints prior to priming and applying RonaScreed Renovation Screed.
Plywood Overlay
Plywood is to be minimum 6.5mm thickness and screw fixed to the substrate at maximum 100mm centres at the board edges and 150mm maximum centres in a grid formation to the board centre. RonaScreed Feather Finish is to be used to fill joints prior to priming and applying RonaScreed Renovation Screed.
Metal
All metal surfaces to be degreased and to be clean and dry. RonaScreed Feather Edge is to be used to fill joints prior to priming and applying RonaScreed Renovation Screed.
Instructions For Use
Priming is always required – refer to RonaScreed Primer technical data sheet
Note
Major imperfections or deviations in the substrate may need to be made good before laying RonaScreed Renovation Screed.
When RonaScreed Renovation Screed is applied in multiple layers, apply RonaScreed Primer between layers.
Mixing/Laying
RonaScreed Renovation Screed may be applied either by mixer/pump Putzmeister SP 11 THF (or similar, note that continuous feed pumps may not provide adequate dispersal of components) or when mixing smaller quantities, mix with a slow speed drill ≤ 450RPM fitted with an MR3 type helical paddle and pour onto the floor. Pump or pour RonaScreed Renovation Screed 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.
For pump applications it is recommended that a contractor with the necessary experience to carry out this type of work is employed. For a list of such contractors contact the Ronacrete Technical Department.
Application Temperature
The substrate and ambient temperature must not be less than 5°C on a rising thermometer at time of application. Materials should be at a temperature of 15°C – 20°C at time of application; lower temperatures will impair flow and surface finish. There should be light ventilation during and after laying. Apply the material within 15 minutes of mixing (at 20°C). Protect the fresh screed from direct sunlight during the hydration/drying process. Low temperatures will reduce the flow of the wet screed and increase the risk of surface undulations and imperfections. Take extra care when working at low temperatures.
Joints
It is recommended that isolation joints are positioned in doorways. Large areas should be sub-divided by using temporary dividing strips to limit bay width, ensuring that a wet edge is maintained. Bay joints and movement joints in the substrate must be brought through into the topping.
Cleaning
Tools and equipment should be cleaned with water immediately after use. Cured material can be removed mechanically.
RonaScreed Renovation Screed Packaging
RonaScreed Renovation Screed – 20kg bags.
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