Objectives

The primary objective is to design, supply, and install a protective roof shelter over the existing standby generator area at Townhill Office Park. The structure aims to shield the generator from rainwater exposure, ensure continuous operational readiness, and maintain a safe, compliant working environment in accordance with national health and safety regulations.

Scope of Work

• Supply, deliver, and erect a complete roof shelter system over the designated generator zone.
• Construct structural supports, including steel poles, main beams, base plates, and concrete anchoring systems.
• Install roof sheeting, edge flashings, aluminium guttering, and rainwater downpipes with correct drainage gradients.
• Fabricate and integrate a dedicated exhaust stack extending above the new roof, compatible with the existing generator exhaust.
• Prepare and submit a comprehensive safety file and work programme for approval prior to commencement.
• Execute all works under Chief Artisan authorisation, ensure minimal disruption to building operations, and remove all debris upon completion.
• Provide a twelve-month guarantee covering all materials, workmanship, and equipment supplied.

Technical Requirements

• CIDB Registration: Minimum grading of 1SL or higher.
• Structural Components: 76x76x3mm square steel hollow-section poles and 200x75mm lip channel beams, both hot-dip galvanised and powder-coated white. Fixed to existing concrete using 400x400x6mm base plates secured with M12 raw bolts.
• Roofing & Drainage: IBR AZ200 charcoal-coloured roof sheeting with proper side/end laps, installed with adequate fall for water runoff. Matching charcoal barge flashings and powder-coated white aluminium gutters/downpipes with shoes to direct water away from the generator.
• Exhaust System: Grade 316 stainless steel exhaust stack extending 500mm above the roof, fitted with a weather flap, securely braced, and designed for easy removal during maintenance.
• Compliance & Standards: Full adherence to the Occupational Health and Safety Act 85 of 1993. All materials must be new, unused, and meet relevant SABS specifications where applicable.
• Documentation: Submission of a certified safety file, detailed programme of work, and proof of trade testing and prior similar experience.

Skills Requirements

• Bidders must hold valid trade test certificates as either a Boilermaker or Welder.
• Demonstrable experience in executing similar structural roofing or shelter installations, evidenced by one completed project order and corresponding completion certificate.
• Employment of competent, skilled artisans capable of performing steelwork, welding, roofing, and drainage installation to industry best practices.
• Appointment of a specialised subcontractor or dedicated team specifically experienced in shelter fabrication and installation.
• Supervision by a qualified contractor representative authorised to receive instructions and manage site operations.

Key Terms & Explanations

• CIDB 1SL: South African Construction Industry Development Board grading indicating competency in specialised steelwork projects up to a specified financial threshold.
• IBR AZ200: A specific profile of corrugated metal roofing sheet coated with zinc-aluminium alloy for enhanced corrosion resistance.
• Hot-Dip Galvanising & Powder Coating: A dual corrosion-protection process involving immersion in molten zinc followed by application of a durable painted finish.
• M12 Raw Bolts: Heavy-duty concrete anchor bolts used to securely fix structural base plates to paved surfaces.
• Grade 316 Stainless Steel: A marine-grade alloy highly resistant to corrosion and high temperatures, ideal for exhaust applications exposed to weather and fumes.
• 80/20 Preference Point System: A public procurement evaluation model allocating 80% of scoring points to price competitiveness and 20% to socio-economic goals, such as full black African ownership.