Norcros Adhesives outlines the importance of levelling compounds in any contract flooring job. ON EVERY LEVEL
Any newly-laid or screeded floor surface 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. This is because floors, whether concrete or other material, are typically laid to fairly inaccurate tolerances. The leveller acts as an intermediate layer, which can then be tiled over, or any other type of floorcovering applied.
If tiling on to concrete, the concrete must be at least six weeks old to enable movement caused by drying shrinkage to have taken place. It should be clean, dry and free from dust or contaminants which may act as a release agent and prevent the adhesive from bonding to the concrete.
Procedures vary for tiling on to cement/sand screeds, anhydrite screeds, chipboard or over existing tiled surfaces
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. The primer is suitable for use directly on to dense, non-absorbent smooth surfaces and epoxy and PU-based primers to provide a rough textured key for levelling compounds to bond to.
Norcros Adhesives offers a one-stop shop for all stages of the tiling process. This includes surface preparation and primers, as well as an expanding range of levellers, adhesives and grouts. The company has a number of different levelling products for different applications. Norcros Pro 30 Fast Track Levelling Compound contains recycled crushed glass, which replaces quarried sand.
It is a flexible, single-part leveller that’s 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.
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 tiling. It is suitable for use on timber floors which have been overlaid with 15-18mm WBP or marine-grade plywood. The product comes in a 20kg pack.
Norcros Pro 50 Levelling Compound is a single part, fibre- reinforced self-smoothing floor underlayment, suitable for use from 3mm to 50mm in one application without the need for additional granite chippings. It is ideal for levelling a variety of substrates including concrete, screed, flooring grade asphalt, terrazzo and quarry and vinyl tiles.
Norcros Pro 10 Levelling Compound is a single part polymer modified self-smoothing floor levelling compound. It is suitable for levelling a variety of substrates including concrete, cement/sand screed, flooring grade asphalt, terrazzo and existing quarry and vinyl tiles. It is ideal for use with under-tile heating mats.
Its excellent levelling and flow properties make it ideal for preparing subfloors prior to fixing ceramic, porcelain or natural stone tiles. It has a setting time of three hours permitting early foot traffic and fast track tile fixing. The product is designed to be used up to 10mm thick in one coat, or with the addition of single size granite chippings up to 20mm.
Alternatively, Norcros 2-Part Levelling Compound may be used from feather edge to 10mm in one application without the need for additional granite chippings. The product is suitable for levelling a variety of substrates including concrete, screed, flooring grade asphalt, terrazzo and existing quarry and vinyl tiles. It is ideal for use with under-tile heating mats to encapsulate the wired elements, providing a level substrate to tile on to and also protecting the heating elements during the fixing process.
It has a setting time of three hours at 20°C permitting early foot traffic. Ceramic and porcelain floor tiles may be fixed after three hours. Soft floorcoverings may be fixed after 12 hours and natural stone after 48 hours.
Completing the range is Norcros Pro 10+ Levelling Compound. This is a pumpable polymer-modified cementitious single part floor leveller, suitable for use up to 10mm in one application, ready for laying ceramic or porcelain tiles after approximately three hours. Natural stone tiles and soft floorcoverings such as carpet, vinyl and timber can be laid after about 24 hours.
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