TransTech’s Vertical Joint Maker attaches to the paver screed at the edge of the mat to provide precompaction of the HMA mix before the screed. This simple yet effective device helps to develop some  confinement prior to the shaping of the joint edge by the screed.  This additional compaction booster has proven to provide higher densities at the joint, provide a more vertical edge and better aggregate interlock when closing the joint. It also serves to dramatically reduce segregation.