Chipseal Design

Factors affecting the design and the field performance of chipseal surfacings are complex. Local conditions can significantly influence the way a seal is designed to get the best performance.

Prior detailed knowledge of chipsealing materials is an essential requirement for this course. A short preparatory course “Chipseal Materials” is available for those who wish to update their knowledge (normally run the previous afternoon).

The treatment selection and design procedures from the textbook "Chipsealing in New Zealand" provide the basis for this course and a range of worked examples are included.

A problem-solving session in syndicate workgroups also aids understanding. In addition, the practical application of the NZTA P/17 performance-based specification will be covered in detail.

Who should attend

People with limited knowledge of chipseal design and experienced practitioners wishing to update their knowledge in line with the new approach in the "Chipsealing in New Zealand" textbook and in the application of the P/17 specification.  Personnel from Local Authorities, contractors and consultants will find this course particularly useful.

Entry recommendations

  • To fully understand and successfully complete this course, attendees must already have a sound knowledge of the nature and properties of road surfacing component materials. Participants can gain this essential knowledge by first attending the NZIHT preparatory course Chipseal Materials, as knowledge of this subject matter will be assumed.
  • It is recommended that attendees should also attend or have completed a Bitumen - Basic Safety course within the last five (5) years.
  • For maximum benefit it is recommended that participants have the mathematical ability of at least NCEA Level 1

Participants to bring to course

It is recommended that participants have access to a copy of the “Chipsealing in New Zealand” Text Book released by the NZ Transport Agency in 2006.

This book is now out of print, but a full copy is available on the NZ Transport Agency website:
(choose Resources and Manuals and then Manuals. Scroll down until you see 'Chipsealing in New Zealand.' )

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WITT and this programme are part of Te Pūkenga – New Zealand Institute of Skills and Technology 

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