RIGHT LEVEL for perfect preparation. The experts at BAL advise.
Max has consistent drying times, meaning that it can receive ceramic tiling after just four hours at 20°C even at 80 mm depth (minimum of 24 hours when applying soft-floor finishes).
While many levelling compounds need to be spike-rolled – adding more time to the installation; BAL Level Max doesn’t require spike rolling as it has, by design, excellent self- smoothing and flow properties. This means it finds its own level when spread out, requiring only a suitable finishing trowel or long-handled blade making it easier to achieve a smooth even finish. It also maintains good wet edge properties for more than 20 minutes, enabling good blending in with previous areas without any noticeable ‘joins’. Also, BAL Level Max has good self-healing properties thus enabling any trowel marks to drop out easily.
After you’ve chosen your floor levelling compound it is crucial that the background, you’re levelling is fully and correctly prepared. Firstly, ensure that the surface is clean, firm, dry and free from grease, dust and any other contamination which may be considered barriers to adhesion.
Any new concrete or screed must then be left to fully cure in accordance with the relevant codes of practice before applying any products including levelling and smoothing
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compound. Direct-to-earth sub-floors should incorporate an effective damp-proof membrane such as BAL DPM.
The majority of floor substrates will also need priming before tiling – always check with the manufacturer on the suitability of the primer to use with the background in question. Without priming, the levelling compound can be prone to pin-holing – small holes that are caused by the slow escape of air from absorbant surfaces such as sand/cement screeds. While nine times of out 10, this isn’t a major issue, some extreme pin-holing can cause structural issue with the levelling compound. So, it is always worth priming with a suitable SBR or acrylic primer.
When mixing your self-levelling and smoothing compound always ensure you follow the mixing instructions and quantities – as too much water, or the wrong mixing speed could cause issues.
BAL’s Technical Advisory Service is fully equipped to provide support to contractors, architects and tilers using levelling and smoothing compounds – including NBS M40/M10/M20 specification assistance, on-site consultancy and expert technical advice.
www.bal-adhesives.com LEVELLING COMPOUNDS | 23
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