Drainage system supports Menlyn Maine’s green goals

by Tania Wannenburg
Drainage system supports menlyn maines green goals KAYTECH

Kaytech has provided an environmentally friendly, structural drainage system for the Menlyn Maine Shopping Centre.

As part of the construction of the first green mixed-use city in South Africa, Menlyn Maine in Pretoria East, Kaytech has implemented an effective structural drainage system for the Menlyn Maine Shopping Centre.

The Menlyn Maine development is the largest mixed-use precinct to be built in Pretoria, and is currently transforming the traditional residential suburb of Menlyn in the east of the capital. Earmarked to be South Africa’s first green city, its buildings, which include office space, hotels, residential units and retail space, are designed to receive top ratings from the Green Building Council of South Africa.  

Structural drainage solution
The system serves to lessen the accumulation of underground pore water pressure in the basement area of the mall and consists of bidim A2 and fine stone, which is covered with high-density polyethylene (HDPE) plastic. It was installed prior to the casting of the concrete flooring under the watchful eye of Kaytech’s technical sales representative, Christiaan van Wyk, who was onsite to ensure that the installation ran smoothly.

Kaytech’s bidim geotextile is manufactured in South Africa from 100% recycled polyester. It is a continuous filament, nonwoven, needle-punched geotextile that provides appreciable thickness, high porosity and a high drainage capacity both transverse and normal to the plane.

In addition, as a structural system to increase the stability of the basement, Zip Core was installed on the walls with toe drains consisting of bidim and drainage pipes along the bottom.

Zipcore is a high-strength, pre-formed drainage system consisting of a horizontally aligned, single cuspated HDPE sheet. This lightweight, flexible sheeting is simple to install, simple to join, and provides high water-flow capacity, high compressive strength and requires no aggregate.

“The cause of failure of most earth retaining structures is excess water trapped behind the walls,” Van Wyk points out. “Therefore, a network of sub-soil drains was installed on the exterior to decrease the volume of underground water reaching the basement structure,” he explains.

Upon completion of the project, contractor WBHO had installed 38 180m2 of bidim A2 and 420m of Zip Core.

According to Van Wyk, the combination of Kaytech’s high-performance geotextiles resulted in a cost-effective, easy-to-install drainage system. “By eliminating the need for costly conventional drainage methods, Menlyn Maine Development Corporation was saved a significant amount of money,” he says.

Tel: 0317172300
Website: www.kaytech.co.za/product/bidim/; www.kaytech.co.za/product/zipcore/

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