Tar and Chip

Tar and Chip surface dressing is a traditional surfacing system consisting of C67BC bitumen emulsion or polymer-modified bitumen, applied directly to asphalt or a concrete surface with a tanker or a mobile tar-spray unit. After the bitumen application, we lay 6-10mm gravel, or granite chippings over the hot liquid bitumen to form a complete coat of aggregate.

The consolidated end form is achieved with a PTR (pneumatic-tired roller) to ensure that the material is thoroughly bound to the bitumen without aggregate breakdown. After Compaction surplus aggregate is removed leaving behind an in situ gravel surface.

It is important before spraying that all street furniture, kerbs and brickwork area taped up and protected from over-spray.

Where is Tar and Chip suitable?

Tar and Chip surface dressing is suitable for laying over tarmac or concrete as the surface is stable clean and void-free, Tar and chip surface dressing is an effective way of prolonging the life span of any aged road or drive by acting as a barrier and preventing water and frost damage

Benefits of Tar and Chip:

  • Increases the longevity of asphalt or tarmac surfaces.
  • Anti-slip features
  • Cost-effective solution to alternative surfacing solutions.
  • Quick to apply, up to 7,000m2 can be completed in a single visit.
  • Aesthetically pleasing, providing a natural look.
  • Available in a range of coloured aggregates including;  grey pink granite, golden gravel.
  • Easy to maintain

Preparation is key:

Planning is essential to prolong the life cycle and sufficiency of the surface dressing. Although this method works well to stabilise surfaces, it’s essential that the underlying asphalt or concrete is inspected before application; if the overlay surface is wet, damp or far too deteriorated the Tar and Chip surface dressing will not bond and lift in a short period of time

At Blue Rock Group we take every necessary precaution, assessing the existing surface and either conditions to determine the requirements for your surface dressing before initiating the project. For the best results, we typically only perform surface dressing if the temperature and time of year are suitable. We look to carry out this procedure during Spring to Autumn, where temperatures are over 10 degrees.

Double Coating

For areas with high volume traffic, including tight turning arks, we recommend a secondary coating of bitumen and aggregate. The second layer will strengthen the surface and prolong longevity despite exposure to consistent pressure and wear-and-tear.


  • Large areas can be completed in a single visit.
  • Cost-effective solution
  • Easy to maintain
  • Easy to replace

Where can tar and chip be used

  • Estate Roads
  • Farm Roads
  • Large driveways
  • Car parks
  • Footpaths

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