Dynamic and Static Joints
Proper joint treatment is a crucial step to a successful resinous floor installalation. Whether it is a non-moving joint or a moving joint, the proper steps need to be taken to ensure these joints don’t come back to haunt you later.
Identify the type of joint you are dealing with:
- Moving or Dynamic (Construction, Expansion, and Isolation)
- Non-moving or Static (Control or Contraction)
Non-moving joints should be filled flush with the surface of the concrete using rigid joint filler compatible with the flooring system. Once filled, the floor system can be installed over the top.
Moving joints need to be honored. Once the floor system is complete, use a ¼” wide blade to cut completely through the system. Use closed cell backer rod and fill with the appropriate semi-rigid joint filler or flexible joint sealant.
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.
Make sure to take time and properly address these details to avoid unnecessary heartburn down the road. Full details on joint treatment can be found in the Joint Guidelines reference sheet.
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