http://go.askthebuilder.com/NewsletterSignupNow founder, Tim Carter discusses what a control joint is, how to install one and WHY they are so important.
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Discover more information on control joints in concrete at askthebuilder.com:
http://www.askthebuilder.com/install-concrete-with-control-joints/
http://www.askthebuilder.com/control-joint-tool-video/
http://www.askthebuilder.com/concrete-cracks/