Crack sealing & crack Filling Crack sealing is a method in which hot sealant is applied to working cracks to prevent water intrusion. What are working cracks? Working cracks are horizontal and/or vertical movements in cracks greater than 0.1 inches. An example of working cracks is a transverse crack. Understanding crack sealants Crack sealants are rubberized and have the ability to seal the crack while staying flexible with the pavement’s movement. Beneficial for active cracks that continue to extend in size and severity over time, crack sealants stop water and debris from entering the crack, protecting the longevity of the pavement. Crack filling Crack filling is the placement of asphalt emulsion into non-working cracks to reduce water infiltration and to reinforce the adjacent pavement. What are non-working cracks? Non-working cracks are horizontal and/or vertical movements in the crack less than 0.1 inches. Examples of non-working cracks include longitudinal, diagonal and alligator cracks. In contrast to crack sealing, crack filling treats pavement that doesn’t show significant movement.