About Time issue 55 | Page 3

BOTSWANA NEWS

By Kagiso Sebetso

Time Projects , on behalf of Barloworld Equipment Botswana , has achieved Botswana ’ s first EDGE Advanced Preliminary Certification . Up to now Time Projects has pioneered the Green Star Office rating tool in Botswana , and we now have the privilege of pioneering a different rating tool , particularly with respect to industrial buildings .

EDGE is an IFC-World Bank green rating tool aimed at promoting affordable green building certifications . To achieve an EDGE Standard certification , the project must demonstrate a 20 % saving in water , 20 % saving in energy and must have 20 % less embodied energy in comparison to a base case of the same building type . To achieve an EDGE Advanced certification , a project must have a 40 % saving in energy and score 20 % for water and 20 % for embodied energy .

Barloworld was targeting an EDGE Standard certification but achieved an EDGE Advanced certification . This preliminary rating is only for the design and the project will be assessed again for its post-construction performance . We hope to maintain the EDGE Advanced certification for the post-construction award .

Herewith a high-level overview of sustainable measures targeted : ENERGY :

• Insulated roof to minimise heat losses and gains in winter and summer respectively .

• Use of efficient glass for the windows and glazed doors .

• Use of ceiling fans instead of mechanical heating and cooling in the workshop areas .

• Efficient cooling system in the office areas .

• Efficient heating system in the office areas .

• Use of heat-pump for water heating .

• Efficient lighting for internal areas and external areas with optimum lighting power densities .

Not having insulation in the exterior walls and floor slabs means that the project scores less for energy savings , but this is an advantage in the materials as it means that the project scores less for materials .

WATER :

• Efficient tap fittings , with lower flow rates than a benchmark building , are used to minimise water consumption .

• Toilets and urinals with lower flush volumes are used to minimise water consumption .

• The wash bay will have a wastewater treatment system .

MATERIALS :

• Use of fly-ash in all concrete mixes to minimise the amount of embodied carbon in the structure . The coffer slab for some of the suspended slab further reduced the amount of embodied carbon in the structure .

• Use of no insulation material in the floors and exterior walls means that the building has less materials and therefore lower embodied carbon .

• The use of steel profile cladding and stock brick over fired clay brick means lower embodied carbon .

• The use of a finished concrete floor in the workshop area , instead of other floor finishes , means lower embodied carbon .

• The chosen porcelain and carpets in offices and passages perform better in terms of embodied carbon when compared to laminated wooden flooring .

• The steel roof has a much lower embodied carbon than the standard in-situ concrete roof slab .

The main contractor , Stefanutti Stocks , will play a big role in the post-construction certification of the project after completion .

ISSUE 55 - SEPTEMBER 2023 3