What is the purpose of the structure/ project?

Speculative warehouse park for rental. Designed for Growthpoint Properties.

What was the brief to the architect?

To design a phased industrial park with flexible sub-divisible warehouse units with maximum coverage.

The unusually shaped brownfield site proved a challenge to provide feasible development coverage while accommodating onerous vehicular access requirements from the municipality. The architects tested numerous speculative and tenant-specific designs on the site before the client settled on a phased speculative development for the park. 
The initial phase of the development provides the largest warehouse of the park, a sub-divisible building offering three 3,800m² units and one 7,125m² unit capable of consolidation into larger units. Utilising the natural gradient across the property, units with either on-grade or docked loading are offered for marketability. 

Was the project envisaged in steel from the start? If not – why was it built in steel in the end?

Yes.

Give a brief description of the structural framing. What type of sections were used (e.g. hollow, cellular, I beams etc) and why?

Isections – Girders top – internals back to back equal angles – Trusses – Longleg horizontal angles – top chord equal angles – internals used equal angles – Horizontal Bracing equal angles chs struts – vertical bracing equal angles CHS strutts. – Sheeting roles cold form lip channels c sections and purlins – Colums were Isections. – Innovation – Movement joint in steel structure

Give a brief description of the cladding process (complexity, difficulty, innovation etc)

Innovation – Movement joint in steel structure

A cost-efficient and simple, but innovative roof light detail was developed to minimise on the amount of flashings installed (typically the point of water ingress on shallow pitched roofs in the Cape).  Polycarbonate sheeting was installed in 800mm lengths (mitigating expansion concerns) draining perpendicular to the fall of the roof on lipped channels fixed on top of the purlins.  This facilitated the speed of installation as the roof lights could be retro-fitted after the roof sheeting was completed. 

Were there any challenges in the fabrication of the project from the engineer’s design – if yes, please tell? Tell more about fabrication and erection process if it was complex, difficult, innovative etc.

No. The steelwork design was developed in conjunction with the fabricator (Mazor) to facilitate speedy erection. The principal concern with fast-track industrial construction is to erect the steelwork as quickly as possible to allow for the roof sheeting and vertical cladding to be completed thus allowing for the casting of the concrete warehouse floors. The pouring of super-flat concrete floors cannot be done until the warehouse is fully enclosed.

The architect also worked closely with the engineer and fabricator to develop the canopy hanger detail as a feature. Where possible exposed steel structure was also painted red to celebrate structural elements often overlooked.  

What is special/ unusual/ innovative/ aesthetic about the steelwork/cladding in this project?

Refer to point 5 and 6 above (the rooflight detail and colours). The lightest colour sheet was selected to mitigate heat gain.

How did the project team work together (e.g. contractor involved early, challenges/ ease of communication etc.)

The consultant team has worked together on other developments for Growthpoint Properties and had

STRUCTURAL STEELWORK
Completion date of steelwork August 2018
Completion date of full project 20 October 2018
Tons of structural steel used 480 tons
Structural profiles used I-Sections 203 133 x 2.5 – 305 x 102 x 25- c140 c160 – 254 x 136
CLADDING
Completion date of cladding July 2018
Cladding profile/ type used Saflok 700 0.53mm AZ150 Colorplus Seaspray
Cladding area/ coverage and tonnage 19,450 sqm roof, 5950 sqm vertical sheeting
Cost of cladding R 6, 526, 000.00
PROJECT TEAM COMPANY
Nominator Safintra
Client/ Developer Growthpoint Properties
Architect Loudon Perry Anderson
Structural Engineer Aurecon
Quantity Surveyor MLC
Main Contractor Group 5 Coastal
Steelwork Contractor Mazor Steel
Steel Erector Mazor Steel
Cladding Manufacturer Safintra Roofing
Cladding Contractor Chartwell Roofing