NSW Building & Civil
Night crew in hi-vis sealing road cracks with hot liquid sealant from a tanker under work lights, fresh black seal lines across the road

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Service 14 / 18

Liquid Crack Sealing

Hot liquid sealant run into road cracks to keep water out and stop small cracks turning into potholes.

At a glanceNSW

  • 01Cracks cleaned, then sealed hot
  • 02Night and off-peak shifts
  • 03Stops cracks turning into potholes

The job

Cracks let water into a road. Once it gets in, it softens the layers underneath, and small cracks soon turn into potholes and broken pavement. NSW Building and Civil seals road cracks for councils and government agencies, filling them with hot liquid sealant that keeps the water out and helps the road last longer.

Sealing cracks early is one of the cheapest ways to look after a road and put off the cost of resurfacing. We often work at night or outside peak hours, with our own traffic management, so streets stay open and are back in normal use soon after the sealant sets.

What we do

Liquid Crack Sealing

  1. Inspection

    We look over the road, mark the cracks that need sealing and plan the work and traffic control around the street.

  2. Cleaning

    Each crack is blown out with compressed air to clear dirt, loose stones and moisture, so the sealant sticks to clean, dry asphalt.

  3. Hot Sealing

    Sealant heated in the tanker is run into each crack through a hand wand, filling it and covering the edges with a thin band.

  4. Finishing

    The sealant is left to set or dusted with fine grit, then the cones come off and the road reopens to traffic.

Next layer → Service 15 / 18

Stairs & Handrails