Proper waterproofing at vertical and horizontal expansions joints is critical to the long-term success of a waterproofing application. Continual movement of these joints can lead to openings that allow for moisture infiltration if the detail is not properly completed. The detail provided is for expansion joint openings that are a maximum of one 1 inch in width. The designer should note that expansion joints that exceed one 1 inch in width require a separate detail. The detail provided only accommodates a maximum of 50 percent total movement.
The flashing material applied at expansion joints should be reinforced even if the waterproofing system is an unreinforced Liquid Applied Membrane system.