Balwin HQ_renders courtesy of Paragon

“In order to achieve the stringent Net Zero Carbon certification, a project must focus on energy efficiency first,” Alex Varughese, Modelling and Simulations Consultant at Solid Green, explains.

It is necessary to achieve a higher level of energy efficiency than that of a standard green building. And converting to a fully renewable supply also makes the project financially attractive to the developer.

Balwin HQ_renders courtesy of Paragon

The building is targeting an energy consumption of 101kWh/m2/year, far less than the 218kWh/m2/year required by SANS10400 XA for a building of equal size and specification. Energy modelling was carried out in the design stages to compare the building to a notional building model. Greenhouse gas emissions associated with operational energy consumption were reduced by 103%. This was achieved through sub-metering and effective monitoring of energy systems; through the provision of motion sensors to designated zones; and by improving the lighting power density through efficient lighting design.

Because the behaviour of building occupants and users is critical to reduce building energy consumption, a learning resource has been provided that communicates energy and water data as well as educational material on sustainability initiatives implemented in the building.

Balwin HQ_renders courtesy of Paragon

As a refurbishment, one of the key strategies was that of reuse. Says Kim Newell, Associate at Paragon Architects, “In today’s global socio-economic environment, we need to consider resources more carefully. The importance of upcycling existing buildings cannot be overstated. We were able to reuse the entire structure of the building and adapt it to meet the requirements of the brief.”

100% of the building structure was reused, while materials that are typically replaced during a refurb – such as mechanical ducts, fire water piping, balustrades and sanitary fittings and fixtures – were also reused. In addition, the architects managed to keep the concrete structure and the quintessential elevated concrete box, and added the additional level on top, without having to strengthen the foundation.

Balwin HQ_renders courtesy of Paragon

A new steel roof structure houses a 183kW photovoltaic system installation, which has an annual energy production of 285.7MWh, allowing the base building demand to ultimately achieve Net Zero carbon emissions. The existing MV/LV supply infrastructure and metering was reused, including the main LV distribution board. Existing DB boards and electrical installation to the basement parking floors were retained, with only the new parking levels receiving new lighting.

Balwin HQ_renders courtesy of Paragon

Commenting on the importance of this redevelopment, Steve Brookes, CEO of Balwin Properties, says

Targeting a Net Zero carbon certification for Balwin’s head office presented both a challenge and an opportunity. With our vision of better building practices for people and planet in mind, it’s a challenge that we eagerly embraced. The Green Star and Net Zero Carbon certifications for this project have reinforced Balwin as a sustainability leader in the property sector.

Project Team

Owner: Balwin Properties
Accredited professional: Solid Green Consulting
Architect: Paragon
Electrical engineer: Sutherland
Fire engineer: Sutherland
Lift specialist: Kone
Mechanical engineer: Sutherland
Quantity surveyors: JMHT Quantity Surveyors
Structural engineers: Sotiralis Engineers
Sustainable building consultant: Solid Green Consulting
Wet services: Sutherland
Main contractor: Onsite Solutions
Project manager: Onsite Solutions
Environmental consultant : LEAP
Interior designer : Paragon Interface
Commissioning agent: Cardinal Commissioning Services
Renewables: RWP

The post Balwin Headquarters achieves both Net Zero and 6-star certifications appeared first on Solid Green Consulting.

Balwin Properties has been a dream of mine since I was a 14-year-old boy. It’s a fantastic business made up of partners and collaborations of professionals – I’m very proud of our people. We want to make this a better place and aim to be the leading residential property developers in South Africa.

Made up of four basement levels and five office floors, the development will push its sustainability ambitions even further by aiming for Net Zero Carbon and Net Zero Waste certifications. Paragon, who handled the original design of the building, was also commissioned to undertake the refurbishment.

This entailed the removal of the three iconic cone-shaped elements from the building and the addition of two new floors under the elevated concrete box. The original building had a double volume storage area in the basement. An additional slab was cast into this space to add another level of parking to the building. In the existing double volume from ground floor to first floor a new floor slab was cast on upper ground level to increase the GLA. On the roof level a steel structure was added as a third floor to the building. The steel roof will house a photovoltaic installation that will provide sustainable power for the development. The architects managed to keep the concrete structure and the quintessential elevated concrete box, and added the additional level on top, without having to strengthen the foundation.

Solid Green assisted the project team with the integration of Green Star objectives and processes throughout the design and construction phases. Architect Kim Newell from Paragon says, “It has been very interesting to have Solid Green on board as it has helped us greatly to achieve the Green Star certification. Originally, we had designed a full glass form that fitted into the existing concrete box, and we had in mind a similar design for the roof. But, to make that design function in terms of sustainability, we were looking at double glazed performance glazing that would cost a fortune. Solid Green also advised us in terms of glare and thermal issues, as the glazed building would not have been a very comfortable space in which to work.”

The design had always included timber fins that the architect envisioned for shading and much of the glass was also replaced by vertical brickwork panels, as is visible in the architectural renderings. Says Newell, “Replacing the glass changed the aesthetic, which is still very successful with the black brick panels, dark grey glazing and the timber fins that will be fitted onto the building. It is going to be a very interesting, as well as comfortable, building for people to work in and visit.”

The timber fins, which will be installed in January 2022, are a design element that looks easy but needed quite some tweaking. The type of wood used is FSC certified Accoya, and the team had to attend several workshops with this very durable type of wood to get the detailing right. Solid Green provided guidance on the spacing and angling of the fins to achieve the right amount of thermal comfort.

Zendré Compion, Senior Sustainable Building Consultant at Solid Green on this major refurbishment, comments, “There is inherent value in refurbishment projects like this, and the Green Star tool is set up in a way that credits building projects for doing major refurbishments. Not only did this project use previously developed land, but it also reused 100% of the original structure, only adding structural elements in order to increase the building lettable area.

A commissioning expert was included in the team to ensure that the building is commissioned to the highest standard, while Balwin has an in-house team member who is responsible for renewable projects and will look after building tuning upon completion.

The value of tuning and commissioning is easily underestimated on projects but, where Commissioning professionals are included from project inception, building systems perform better, are more reliable, and lead to a reduction in energy and water consumption. The base building rating has greatly benefitted from the project’s renewables component that has also enabled Balwin to target Net Zero Carbon for their headquarters.

Project Team

Owner Balwin Properties
Accredited professional Solid Green Consulting
Architect Paragon
Electrical engineer Sutherland
Fire engineer Sutherland
Lift specialist Kone
Mechanical engineer Sutherland
Quantity surveyors JMHT Quantity Surveyors
Structural engineers Sotiralis Engineers
Sustainable building consultant Solid Green Consulting
Wet services Sutherland
Main contractor Onsite Solutions
Project manager Onsite Solutions
Environmental consultant LEAP
Interior designer Paragon Interface
Commissioning agent Cardinal Commissioning Services
Renewables RWP

The post Balwin Headquarters – Net Zero ambitions for a 6-star building appeared first on Solid Green Consulting.