Joint edge insert

A joint edge insert comprising:

• an elongated waveform positionable between two spaced apart elongated joint edge members of a joint edge assembly attached to two adjacent concrete slabs and engagable with opposing respective first and second inner surfaces of the elongated joint edge members, the elongated waveform including an upstanding wall having a plurality of sections, the sections including a plurality of first member engagers extending in a first direction from a longitudinal central axis of the elongated waveform and engagable with the first inner surface of the first joint edge member of the joint edge assembly, and a plurality of second member engagers extending in an opposite second direction from the longitudinal central axis of the elongated waveform and engageable with the second inner surface of the second joint edge member of the joint edge assembly, wherein the elongated waveform is rigid in a vertical direction, is partially flexible in a longitudinal direction, is partially flexible in the transverse direction, and includes weakened areas that facilitate transverse compression of the elongated waveform.