Chipseal Design

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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, including worked examples.


Click here to register your interest for this course and we will contact you when we get a course running in your area.

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2 day course.

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Barry Gundersen

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$895 per person + GST 


$1095 per person + GST to attend two and a half consecutive days (ie: Chipseal Materials followed by the Chipseal Design course)

(Minimum numbers apply before a course is confirmed)

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Topics include

  • Understanding the stresses on a road surface
  • Skid resistance basics
  • Assessing chipsealing needs
  • Preseal treatments
  • Importance of addressing adhesion issues
  • Chip materials and specifications
  • Design processes and options
  • Worked design exercises
  • Plant used in chipsealing construction
  • Construction of chipseal and reseals
  • Analysis of faults, failures and fixes
  • Quality assurance
  • Contractual responsibilities and procedures for P/17
  • Determination of acceptance criteria for P/17
  • Acceptance testing nad payment for P/17
  • Worked P/17 examples
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On completion of this course participants will

  • Assess chipsealing needs
  • Understand and undertake design steps required
  • Determine pretreatments required
  • Determine appropriate surfacing treatments and binder application rates
  • Calculate hot binder spray rates and chip application rates
  • Identify essential spray preparation/spraying control, traffic control/compaction checks to ensure quality of seal
  • Select plant for production requirements and job type
  • Understand the contractual frameworkfor P/17 contracts
  • Determine P/17 acceptance criteria
  • Carry out acceptance measurements and apply acceptance criteria to completed chipseals
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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.


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Presenter information

Presenter Profile: Barry Gundersen has over 38 years engineering and management experience in the road surfacing industry on both sides of the Tasman. He was National Technical Manager for Bitumix (NZ) for 15 years before setting up his own consultancy in 1995, specialising in road surfacings. Barry has been a visiting lecturer at Auckland University for 12 years and also runs training courses for the Australian Asphalt Pavement Association.

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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
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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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