The most typical types of foundations that foundation construction service companies use today are slab foundations, concrete piles, combination walls, steel tubes or corrugated wall piles, and similar. Within those categories, there are many variants and types for different sub-surface conditions, building sizes and heights, and other factors. The overall goal of the foundation constructions is to provide reliable, stable bases for the buildings above them, with sub-surface anchoring to prevent or negate settling, seismic movement, soil and bedrock changes below the site, and to help distribute building load, wind shear, and other forces.