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That makes for a better foundation: poured concrete or concrete block? I'm willing to bet that, of the nine out of ten builders who answer "poured concrete," few have had much experience with block walls. Concrete block foundations are strong, go up quickly, and in my area, they cost about 15% less than poured basements. As with anything else, of course, the success of a block wall foundation depends on proper design and detailing. Get Off on the Right Footing Given the wide range of soil characteristics you may encounter, it's impossible to describe a footer size that will work in all situations. The rule of thumb is to make the footer as deep as the wall is thick, and twice