LEVEL Norcros Adhesives advise on how to ensure you ha
Whether a floor is to be finished with tiles, resilient flooring, carpet or any other covering, achieving a level subfloor is critical to a successful outcome. Any newly laid or existing substrate is likely to need levelling with the use of a self- levelling compound to ensure there is the lowest possible height variance in the floor. The leveller acts as an intermediate layer, on to which the finished floorcovering can be laid.
Concrete must be at least six weeks old before floorcoverings are laid. This drying period allows movement caused by drying shrinkage to take place. The floor should be clean, dry and free from dust or contaminants which could act as a release agent and prevent the adhesive from bonding to the concrete.
Preparation requirements differ depending upon the substrate. Cement/sand screeds, anhydrite screeds, chipboard or existing tiled surfaces all require different priming or sealing regimes before they are suitable for levelling.
When levelling impervious substrates such as existing tile finishes, Norcros Key Bond Gritted Primer should first be applied. This is a ready-to-use, low emission, film-forming, fast- drying modified styrene acrylic copolymer dispersion primer which is designed for use directly on to dense, non-absorbent smooth surfaces and epoxy and PU-based primers. Once dry, the primer provides a rough textured key on to which levelling compounds and adhesives can form a strong bond.
Norcros Adhesives offers one of the widest ranges of levellers available on the market. The latest addition to its range is already proving very popular in the contract flooring sector. Norcros Pro AF Low Prep Self Smoothing Levelling Compound
is an ammonia and latex-free, two-part levelling compound. It is suitable for use on most substrates without the need for priming.
It has been specially formulated for use over old adhesive residues including bitumen, historically a problematic material to bond to. There is no need to prime or remove firmly bonded residues. This greatly reduces the time usually required for preparation of the substrate to be levelled.
Norcros Pro 30 Fast Track Levelling Compound is one of the most environmentally-friendly products in this market, containing recycled crushed glass, which replaces quarried sand.
It is a flexible, single-part leveller which is suitable for use from featheredge to 30mm in a single application, without the need for additional aggregate. It is ready to tile after just 45 minutes, and can receive impervious floorcoverings after 90 minutes, allowing early foot traffic and fast-track tile fixing.
The product is suitable for levelling a variety of substrates, including:
• Concrete • Cement/sand screed • Flooring-grade asphalt • Existing quarry and vinyl tiles • Overlaid timber floors
Norcros Pro 30 Fast Track Eco is also suitable for encapsulating under-tile heating mats and cables, protecting the heating elements during the tile-fixing process as well as providing a level surface for the provision of a floorcovering. It
24 | LEVELLING COMPOUNDS
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