Control Joint - YouTube- control joints vs expansion joints , · http://go.askthebuilder.com/Newslette... founder, Tim Carter discusses what a control joint is, how to install one and WHY they are so important. Get FREE tips like ...Control Joint vs. Expansion Joint DifferenceThe expansion joints are incorporated to endure the stresses. An expansion joint is simply a disconnection between segments of the same materials. In the concrete block construction, the expansion joints are expressed as control joints.