With the ever-changing construction world, buildings are often constructed using flexible materials, however, when the plans/dimensions are too large, properly located expansion joints are required. There is no defined requirement for distances between expansion joints because of various variables needing to be considered, such as temperatures, location, number of corners, adjacent materials (membranes) etc.
Expansion joints are typically placed in a concrete slab and on walls and roofs to define the extent of the individual displacements with a predetermined plan layout. Expansion joints must be designed in order to allow movement of the slabs and walls on both sides of the building either at the same time or individually. They ultimately can transfer flexural stresses produced by the building walls and slabs from external loads.
Common Expansion Joints Issues
There are however common issues with expansion joints which may include warping, cracks, failures and unwarranted noise levels due to normal wear and tear. Gaskets, cover plates, and adjacent membrane could also begin to crack if the load or elasticity capabilities were exceeded. Covers can also become a trip hazard if damaged from extreme movement or excessive weight being applied to them. Excessive noise from an expansion joint cover is usually a sign that the gasket is either missing, damaged or failing which in turn causes the internal metal workings to rub together.
Expansion joint covers will generally warp due to excessive loading, therefore, it is critical when specifying an expansion joint to check the loading capabilities of the cover. Consultants and/or contractors alike should do their due diligence and recommend heavier and more durable options where applicable.
Western’s team is trained and certified to install multiple types of expansion joints including loop and mechanical joint system. Talk to us today.