Roading Aggregates

Winstone Aggregates is New Zealand’s largest manufacturer and distributor of aggregates to the roading industry.

Sealing Chip

A range of high quality sealing chip from Grade 2 to Grade 6 is produced to meet NZTA specifications.


Products: CTB, TNZ40, GAPs

Winstone Aggregates produces NZTA compliant basecourse for use on state highways and other heavily trafficked areas. General-purpose GAP products are also available.

Sub-Basecourse 65mm – 100mm

For controlled hard-fill, sub-basecourses that meet local and national specifications are available.

Sub-Grade Improvement

Improve natural foundations with a variety of sub-grade fill aggregate including All Passing 100mm.