Road Science offers a comprehensive portfolio of asphalt products engineered to meet the diverse demands of New Zealand’s transport infrastructure.

From high-performance mixes for heavily trafficked highways to sustainable solutions for urban environments, Road Science delivers asphalt products designed for durability, safety, and environmental efficiency across every scale of infrastructure.

We supply asphalt through Downer’s dedicated paving teams or directly to clients for use in their own projects. With seven strategically located fixed asphalt plants across New Zealand, supported by mobile plants and joint venture partnerships, Road Science ensures consistent, reliable supply and the flexibility to support major developments anywhere in New Zealand and throughout the wider Pacific region.

Our Products

We supply a full range of asphalt products including:

  • Asphaltic Concrete (AC) - ideal for roads, car parks, and driveways
  • Dense Graded (DG) asphalt mix - which provides durability and load-bearing capacity - ideal for industrial areas and commonly used for car parks and residential roads.
  • High-modulus asphalt (EME2) for heavy-duty applications like airports, ports, and freight corridors.
  • Thin surface treatments including;
    • Stone mastic asphalt (SMA),
    • Open graded porous asphalt (OGPA),
    • Each tailored for skid resistance, noise reduction, and water drainage - perfect for motorways and intersections.
  • Ultra thin asphalt (UTA) designed for surface renewal with minimal disruption - ideal for urban environments and overlays
  • Sustainable products like foamed asphalt, warm mix (WAM), and reclaimed asphalt pavement (RAP) supporting lower carbon emissions and circular construction practices.
  • Cold mix and Plantmix provide temporary solutions for emergency repairs and remote applications
  • EnviroTack - Road Sciences high-performance 60% bitumen emulsion tack coat for superior bonding between asphalt and underlying pavement.
  • Quality Pavement Repair (QPR) - a high-performance, permanent pavement repair solution for potholes, utility cuts, and damaged asphalt surfaces

Our Locations

Road Science asphalt plant locations