There are two main face sizes of appropriate blocks manufactured: * 440 x 215mm (work size); * 390 x 190mm (stud size) Non-loadbearing partitions made of aggregate concrete blocks Internal walls support weight. They should be thick enough to be able to withstand the thrust of any horizontally applied load, but not so thick as to be impractical or expensive. A common mistake is to assume that just because a block wall is thin, it will be unable to support a load. This is not the case; you must determine for yourself how much pressure a load will put on a particular wall and then build it accordingly. Load-bearing partitions form an integral part of the structure of a building. They distribute weight across a large area and prevent damage to adjacent buildings or parts of a building. Load-bearing walls can be constructed of many different materials including steel, wood, and concrete. Non-load-bearing walls don't carry weight, but they do keep rooms separated from one another. They provide privacy by preventing sound from traveling between rooms and protect possessions from being thrown around by guests or children. Non-load-bearing walls can be made of anything that will hold up under its own weight such as stone, brick, or paneling. These types of walls usually serve as decoration inside a room rather than as support for anything heavy.