Allco Projects - The Grove

The Grove

Project Requirements

The project required a comprehensive tanking solution withstanding hydrostatic conditions and saltwater contamination.

Industry Sector

Aged Care


Allco’s Voltex SWR was the perfect solution for the salinated site.

Project Details

Project Name: The Grove

Builder: Kalmar Construction

Architect: Pacific Environments

Products Used: Volclay Range & Accessories 

Completed: October 2019

The Project 

The Grove was a new build Retirement Village located just minutes from Orewa Beach. The 76-apartment village was built to meet the growing demand of one of North Auckland’s most sought-after suburbs.


This beautiful village required a comprehensive basement tanking solution that would withstand the hydrostatic conditions. Pre-construction site water tests indicated slight salination at the site due to The Grove’s proximity to Orewa beach which needed to be taken into consideration when selecting products.

The village was to be completed across several stages, therefore required a solution that would allow several walls to be constructed and then removed when the following stage commenced a year later. This presented a risk of leaks that had to be mitigated.


Allco’s entire Volclay range was specified on the Grove Retirement Village.

The site presented several challenges among those the hydrostatic conditions, the saliant water tests and the need for watertight basement tanking.

Due to the hydrostatic nature of the site, the complete perimeter was dewater’ed using a Well-point System. This system provided a comprehensive solution that Allco Senior Technical Advisor Adrian Crow remarked that it was “one of the best de-watering systems I’ve ever seen in construction”.

Pre-construction site water tests on The Grove indicated slight salination so Voltex SWR (Salt-water Resistant) was specified. The entrance to the driveway utilised shotcrete pile faced walls, which served as another reason to utilise Voltex SWR. The benefit of using a membrane such as Voltex SWR is it contains polymers that neutralises the salination within the soil and mitigate the contaminants within the shotcrete walls and protects the bentonite graduals.

To create watertight basement with walls that would be able to be removed between stages, precast panels were utilised. These precast panels were applied with Swelltite and the wall floor joints had double layers due to the hydrostatic conditions post construction.