A rigid, plastic expansion cap with a removable top, VoidCap can be placed over all types of expansion joint. After the concrete is poured the top of the VoidCap is level with the surface of the slab. After the surface of the concrete is finished, the top portion of the VoidCap can be removed leaving a void 1/2in. deep. Any type of self-leveling caulk can be placed into the void sealing the joint from surface moisture.