http://go.askthebuilder.com/NewsletterSignupNow Tim Carter, of http://www.AsktheBuilder.com, demonstrates how to drill holes in clay soil and fill them with a special gravel to prevent foundation cracks.

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Discover more information on expansive soil and foundation cracking at askthebuilder.com: 
http://www.askthebuilder.com/foundation-crack-illustrations/
http://www.askthebuilder.com/foundation-cracks/
http://www.askthebuilder.com/analyzing-foundation-cracks/