90 Grayston Drive

Situated in the heart of Sandton, 90 Grayston is an iconic sustainable development showcasing office design and functionality.

Location

  • Johannesburg, Gauteng, South Africa

Client

  • Redefine Properties

Project Value

  • Project value

Project Status

  • Completed in 2014

Awards

  • 4 Star Green Star SA Office As Built Rating
  • 4 Star Green Star SA Office Design Rating

Design challenges

As the current market is driving the need for green property, Redefine Properties chose to construct a Green Star speculative building without any identified or anchor tenants. The reason for this was to use the Green Star rating to secure high-end tenants.

To help them achieve the 4 Star Green Star SA Design and AS Built rating, WSP was appointed the sustainability consultant for guidance and certification. The team assessed the initial design intent, collaborated with the client and project team members on environmental responsible initiatives, liaised with the Green Building Council of South Africa (GBCSA) on Technical Clarifications (TCs) and Credit Interpretation Requests (CIRs), provided energy modelling and profession-specific Green Star workshops to assist project team members with submission requirements, performed site inspection to ensure critical sustainable design commitments are installed, collected and collated the documentation required for submission to the GBCSA for assessment for the Design and As Built ratings. 

Parking Levels
11 11
Office levels
9 9
Gross Floor Area
21 056m² 21 056m²
Usable Office Area
15 564m² 15 564m²
People
2,110 2,110

Solutions

To construct the green office development, a number of sustainable initiatives were put in place, among them the installation of blinds to combat daylight glare and the implementation of ammonia (refrigerant) chillers, which have a high Coefficient of Performance (COP).

The site’s location also ensures good access to public transport, which provides alternative means of transport for staff and visitors. During construction, the absolute quantity of all Portland cement was reduced by 30% for in-situ concrete by substituting Portland cement with Ground Granulated Blast Furnace Slag (GGBS). The structural and reinforcing steel has as, on average across all types, post-consumer recycled content of more than 54%. Over 30% of the total PVC content by cost was reduced by replacing alternative materials. Fifty percent of the timber is specified to be either Forest Stewardship Council Certified, re-used or to have a post-consumer recycled content.

The end result is that the project, which optimises energy consumption, reduces running costs and uses resource-efficient methods of construction and installation of services, achieved the developers’ goal of attaining its 4 Star Green Star SA Office Design rating and 4 Star Green Star SA Office As Built rating. Accredited by the Green Building Council of South Africa, the 4 Star Green Star SA Rating represents “Best Practice”. 

Services

  • Sustainability consulting for guidance and certification.
  • Assessing the initial design intent.
  • Collaborating with the client and project team members on environmental responsible initiatives.
  • Liaising with the Green Building Council of South Africa (GBCSA) on Technical Clarifications (TCs) and Credit Interpretation Requests (CIRs).
  • Providing energy modelling.
  • Providing profession-specific Green Star workshops to assist project team members with submission requirements.
  • Performing site inspection to ensure critical sustainable design commitments are installed.
  • Collected and collated the documentation required for submission to the GBCSA for assessment for the Design and As Built ratings.