July 25, 2018
There are two types of joints:
- Dynamic (Construction, Expansion, and Isolation)
- Static (Control or Contraction)
Dynamic joints are considered moving joints which allow horizontal and vertical movement between the slab and adjoining structures. These types of joints must be honored by saw cutting through the finished floor system and filling with a flexible joint sealant. Not honoring dynamic joints can lead to cracks in the surface.
Static joints are considered non-moving joints which accommodate shrinkage and relieve internal stress during the curing of the concrete. These types of joints can be cleaned out using a ¼” diamond blade attached to a saw with a vacuum, and filled with compatible joint filler.
Full details on joint treatment can be found in the Joint Guidelines reference sheet.
Dylan Snyder
Technical Manager – West