Always try to have the total amount of bricks supplied in 1 delivery. The size of the bricks may vary slightly between production sites and production batches. If you need several deliveries, retain sufficient bricks from the first delivery to mix with the new delivery. If you do not have sufficient space at your building site, make an agreement with the building material supplier that all the bricks are delivered from one specific batch. This is the only way to ensure the bricks are mixed correctly.