Tips and advice when using a specific self-leveller to ensure a successful end result.
A quick setting, self-levelling screed which can be pumped up to 2 000m² per day under suitable conditions and a surface that can be walked on after 6-8 hours at 25˚C – these are just a few advantages of FloorworX’s Self Leveller, which is a single pack, rapid hardening cement-based screed for levelling floors where quick setting is required.
Furthermore, floor coverings can be normally applied onto a 10mm thick screed after just 24-hours and can either be hand-laid or pumped, while ensuring that no bacteria can be harboured due to the fact that it is protein free.
For refurbishment and new construction projects, finishes such as vinyl tiles or sheeting, rubber, linoleum, carpets, ceramic tiles, wood block or cork, need to be applied quickly. FloorworX’s Self Leveller can be used for smoothing floors in schools, hospitals, public buildings, office buildings, shops, dwellings, airports, prisons, factories, workshops, warehouses and other areas exposed to similar traffic loads.
In terms of surface preparation, the base slab or screed must be sound with a minimum thickness of 40mm and a minimum compressive strength of 25MPa. So too, all surfaces must be clean, chemically sound and free of laitance, dust, grease and oil. The preferred method of preparation is vacuum abrasive blast cleaning although wet grinding followed by vacuuming may also be used. If large, deep holes are present in the subfloor, it is advised to contact FloorworX’s Technical Department.
Turning to priming, concrete surfaces should be primed with FloorworX Acrylic Primer prior to the application of FloorworX Self Leveller to ensure that the bond between the screed and the subfloor is strengthened, thereby preventing the formation of bubbles in the screed and reducing the amount of water absorbed into the subfloor. Two diluted coats of this primer should be applied onto the floor surface by means of a brush and it is crucial that each coat is dry before the self-leveller is applied.
An imperative element to the final success of the self-leveller relates to the mixing process. It is absolutely essential that the correct water to powder ratios and mixing techniques are used when preparing the FloorworX Self Leveller. Two methods are suggested; namely mechanical mixing using a heavy duty drill fitted with an appropriate helical spindle or alternatively, continuous mixing using a mixer pump.
Once the mixture has been poured or pumped over the subfloor, it will level out to a smooth, even finish. It is advised that FloorworX Self Leveller is not subjected to draughts during the first 24 hours of curing as this may lead to cracking and crazing. The room has to be adequately ventilated to allow the screed to dry while contamination by other trades such as plastering need to be prevented.
The end result, should all instructions and recommendations be followed, will result in a smooth, flawless surface that will undoubtedly last a significant number of years.