Regardless of whether a tile is of a small or large size, all rectangular shaped tiles do have some degree of lipping concerns.
As pointed out by the Australian Tile Council "when laid with a brick pattern, the highest part of any curvature correspond with the lowest part of adjoining tiles therefore accentuating lipping'. During manufacture, the tile product is designed to create the most eye pleasing aesthetic when placed on a wall or floor and a tile with a slight convex central curvature will always appear to be more attractive than a plain flat surface. This situation is fine, with the vast majority of manufactures ensuring that any given batch of product will have curvature variation - usually limited to a 1mm range as with all other tile measurement characteristic tolerances. A newer concern has occurred since manufacturers have streamlined their production lines and many manufacturers now only press 600 x600 mm size tiles (or larger) and then cut smaller sizes and shapes as required from them. The reason for these changes is simply to reduce the number of press die and box changes and hence saving quite a deal of production down time. The 600 x 600 mm product produces is usually manufactured well within required curvature standards but, once they are cut into the required shape - say 2 off 600 x 300 mm tiles - this will result with tiles with one usually quite straight manufactured edge as well as one cut edge (from the initial tile centre) and very often with a curvature quite different to the manufactured edge. many installations viewed by Nerang Tiles with lipping concerns in recent times have been where cut rectangular tiles have been placed in a brick pattern. Customers should be aware of possible problems when placing rectangular shaped tiles - particularly cut tiles - in a brick pattern.
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