We advise blending the slabs visually before final application, this will ensure that you are happy with any tonal variation Dry laying also allows you to determine which tiles you can select for the external cuts of your project Please remember to factor in 5-10% for cuts, wastage and breakages All tiles shown on this website are shown as nominal tile sizes. The nominal size is the expected production size of the tile plus the joint size. For example, a tile with a nominal size of 600 x 600 mm will typically have a production size of 597 x 597 mm ( 3 mm joint width) Please refer to our further information section regarding ordering, delivery options and installation. Sizing & Shading There are internationally recognised standards for determining the dimensional characteristics (length, width, thickness, straightness of sides, rectangularity, surface flatness) and the surface quality of tiles. ISO 10545.2 is the standard for dimensions on porcelain tiles. The ISO required value for bowing / warpage is ± 0.5%. This means on a larger 1200x600mm porcelain tile the bowing can be upto 6mm and still conform to the correct standards. Whilst most manufacturers have higher standards than the ISO standards and this amount of bowing would be very rare. You also need to be aware that sizing of slabs is nominal size, so a product advertised as 600x600mm after rectification for example may well be 597x597mm. Your pavers will arrive from one production shade and batch however we can not guarantee subsequent orders will be the same shade and batch therefore please consider this when you work out your quantities to order.