A 300mm pod with 85mm of concrete above is used in an H1 slab. A 300mm pod with 100mm of concrete above is used in an H2 slab. A 400mm pod with 110mm of concrete above is used in an H3 slab. The number indicates the height of the slab in inches above floor level. The letter indicates the depth of the slab. Slabs are usually placed 4 inches (10 cm) or more below the top of the footings to allow for construction work around them. However, slabs can be set closer if special care is taken at job sites to avoid damage. An H1 slab is about 1.5 feet (0.46 m) thick. This type of slab is suitable for loading areas like truck scales and other heavy equipment. It can also be used in applications where a thick slab is needed to protect something underneath it like a kitchen floor. An H2 slab is 2 feet (60 cm) thick. This type of slab is used in applications where a thicker slab is needed to support large objects like furniture. The H2 slab is also called a "kitchen slab" because it provides a flat surface on which to place the kitchen countertop. An H3 slab is 3 feet (1 m) thick.