Concrete or steel piers are used to make foundations for beams and piers. They are driven into the ground, to create a solid foundation, and girder beams are laid over the piers. The crawl space can also be affected by moisture issues, which can affect the wooden components of the home. Mold and mildew can cause structural damage and a foul-smelling odor. Foundation leveling is an essential part of beam and pier foundation repair. Foundation leveling can be accomplished by adding pilings underneath piers or adding piers to foundations that are sagging. These areas can be further supported by braces. It may also be necessary for soil stabilization to repair piers and beam foundations, in addition to pier foundation leveling. San Antonio is well-known for its clay soil.