There are many different types of slab foundations. Most are built with footings which are thickened areas of slab located under load bearing walls. A load bearing wall is a wall that holds up the structure. If a wall isn’t load bearing, it is called a curtain wall. Most curtain walls are used for dividing rooms.
Foundation footings are wider than the foundation’s base and often reinforced with steel. They transfer the load of the building to the foundation and help distribute the weight of the building over the soil or rock.
How the foundation and footings are constructed depends on several factors, including soil and climate. In places where the ground freezes, footings are created first, below the frost line. After the footing has been placed, the building’s walls are constructed. Once the walls are in place, the slab is created.
A slab-on-grade foundation is used in locations where the ground doesn’t freeze. The slab, which oftentimes rests on gravel, is poured all at once. There is no space between the slab and the ground, and the edges of the slab are made thicker than the inside of the slab.
Some slab foundations