This statement was developed by the Public Health Nursing Definition Document Task Force. under the direction of the leadership of the Public Health Nursing Section of the American. Public Health Association. The statement was adopted by the Public Health Nursing Section.
A Universal Expansion joint is an assembly containing two bellows connected by a centre pipe and equipped with tie rods. Universal Expansion joints are mainly used to absorb any combination of the three basic movements in the piping system. (Axial, Lateral, Angular).
An expansion join is installed when pouring against a vertical surface (garage slab), and at roughly 20' to 25' intervals. A control joint is scribed into the slab with a Scoring Tool or a concrete saw, at 10' to 12' intervals.====edit2==== A correction in termonology: An expansion joint is a peice of felt that you place between old concrete and new concrete (or between concrete and brick). You install it before you pour. I believe that you were really taliking about control joints.