Construction World February 2016

CONSTRUCTION WORLD

FEBRUARY

2016

CAMPUS

PROJECTS AND CONTRACTS

The new sustainable I-CAT campus,

in the N4 Gateway Park in Pretoria,

was designed by Earthworld Archi-

tects and Interiors, and completed

by MBA North member, J.C. van der Linde &

Venter Projects, in August 2015.

Pieter Venter, J.C. van der Linde & Venter

Projects' contracts director, says Earthworld

Architects & Interiors concentrated on

maximum sustainability in the design of the

I-CAT campus.

For example, among the environmental-

ly-friendly features that had to be provided

by the contractors was a rainwater harvesting

system, incorporating a 50 000 litres reser-

voir, sunk beneath part of the structural

pergola-covered courtyard outside the main

building. “The reservoir will collect all the

rainwater from the combined roof area, which

covers almost 1 500 square metres. This water

will be filtered and reused to flush toilets

and for landscaping purposes. We also had

to install solar water heaters that convert

solar radiation into thermal energy, and solar

powered heat pumps as part of Earthworld's

focus on sustainability,” Venter stated.

He said some of the unusual features

that had to be provided – and the challenges

faced – by J.C. van der Linde & Venter Projects

for the project included:

• The excessively clay soil had to be cut and

filled with suitable material before work

could start on the foundations;

• The design of the office building called

for top quality ('Degree 1') off-shutter

concrete on all the facades which meant

that the contractors had to employ

special formwork to produce a smooth

off-shutter finish;

• Special recessed patterns had to be

provided in the facebrick façade of the

new building;

• The installation of a special interior

floating concrete staircase with structural

steel frame, close to the reception area,

called for in-situ casting of the top quality

raw concrete stairs specified in the design;

• The provision of the structural steel

pergola in the courtyard called for the

supporting timber poles to be installed

at specific angles instead of traditional

upright installation;

• Interior finishing, apart from the top

quality off-shutter concrete, required

extensive installation of special eco-

friendly spruce plywood for the office

partitions and ceilings; and

• The provision of an intricate, external

curved spiral structural staircase in the

courtyard leading to the roof garden.

The challenges of a

Leading Pretoria building

contractors, J.C. van der

Linde & Venter Projects,

has completed a multi-

million rand contract for

the construction of new

green corporate offices

and a warehouse for I-CAT

Environmental Solutions.

“J.C. van der Linde & Venter Projects also had

to contend with quite a few design changes

during the course of the 10-month contract,”

Hermann Post, J.C. van der Linde & Venter

projects associate, commented.

Earthworld Architects and Interiors' Rudie

Botha says the completion of the new I-CAT

campus realised an ambition to achieve abso-

lute minimal impact on the environment.

Factors such as the local climate's effect

on energy consumption, the use of natural

light and shading devices on applicable

facades, as well as the office staff's thermal,

visual, and acoustical comfort, as well as air

quality were just some of many factors taken

into account.

“In summer, the building is ventilated

nocturnally and during the early hours of the

morning, allowing the temperature inside to

drop. When heat builds up inside later in the

day, the windows at the top of the building

automatically open to allow hot built-up air

to escape. Interior temperature is furthermore

controlled by an automatic air conditioning

system, driven by solar power.

“The use of the light-weight but elegant

spruce plywood office partitions provides

flexibility as the open plan layout can be

divided into smaller sections if needed. The

warehouse also has a column-free design,

with supporting columns only along its perim-

eter, also allowing for interior changes to suit

future needs.”

Botha continues: “On the north-facing

windows, a roof overhang shades the building

completely during summer and partially

during winter. Vertical fins on the east-facing

windows deflect early morning radiation

during the summer and the afternoon sun on

south facing windows. The use of windows

on the facebrick façade, which faces east and

west, was restricted: also for thermal reasons.

SUSTAINABLE

A structural steel pergola

in the campus courtyard is

supported by timber poles

installed at specific angles.

A roof overhang over the north-facing windows of the I-CAT office block

shades the building during summer and partially during winter.