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Porowini Avenue, Whangarei - Allan Block® Ashlar Blend


A-Line Limited


Base Group Consulting


Porowini Avenue, Morningside, Whangarei

Products Used

Allan Block Classic®, AB Ashlar Blend™, Sleeve-It®, StrataGrid® SG200 & DuraForce® AS280


Santi Alvarez

Technical Sales

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This project is based in Morningside, a suburb south of Whangarei, at a site that was being done up for development. This site required a 190 metre, long lasting retaining wall, that was aesthetically pleasing, and designed to withstand vehicle surcharge loadings, along with a fence/barrier to protect people from falling.


Cirtex working relationship with Base Group Consulting started when the project engineers contacted the Cirtex Internal Sales Team inquiring about an Allan Block segmental retaining wall system to run along two of the development boundaries. Ground conditions at the site were poor and the site was subject to long term ongoing settlement, so the engineers were looking for a retaining wall system that was capable of accommodating some differential settlement without compromising the structural integrity.


The installation was carried out by A-Line Construction, a full-service construction company based in Kamo, which happened to be an Allan Block Certified Contractor. A-Line Construction were familiar with the AB Ashlar Blend and always deliver excellence. The onsite team managed to improve ground stabilisation by means of compaction and Cirtex geotextiles.
The highlight of the project was the use of the Sleeve-It system for first time in New Zealand, which A-Line Construction used to deliver maximum value to the client, while minimising the risk of a poorly installed barrier on top of the retaining wall. A-Line Construction found the Sleeve-It convenient, durable and easy to use. The use of Sleeve-It has gained the attention of other contractors and engineers who have stopped to ask questions and take photos.

The products used provided the following benefits to the project:

Products used in this Project


Allan Block®

The Allan Block stacks beautifully and creates a smooth and fluid finish for every wall, bringing a refined look of classic natural beauty to any landscape.


DuraForce® AS Geotextile

DuraForce AS series geotextiles are manufactured and tested to exact quality standards and rated according to the NZTA F/7 specification for geotextiles.



StrataGrid is a high-performance soil reinforcement geogrid. It is manufactured from polyester yarns that have a high molecular weight and excellent tensile strength.