Case Study: Office Building Flat Roof Waterproofing

Location: KwaZulu-Natal, South Africa
Project: Flat roof waterproofing restoration for a commercial office building
Issue: The client experienced persistent leaks due to the deterioration of the old waterproofing system. Over the years, exposure to UV radiation had degraded the upper carrier of the existing waterproofing, leading to water ingress and structural vulnerabilities. The lack of routine maintenance accelerated the damage, necessitating a complete overhaul of the waterproofing system.

Overview:

The office building’s flat roof had an outdated and failing waterproofing membrane. The breakdown of this system resulted in leaks that threatened the integrity of the building’s interior spaces and overall structure. Without timely intervention, the damage would have escalated, leading to higher repair costs and potential business disruptions.

Problem Diagnosis:

  • UV Damage: The previous waterproofing system had deteriorated due to prolonged exposure to sunlight, which weakened its protective layers.
  • Water Ingress: With the protective barrier compromised, rainwater was penetrating through the roof, affecting the building’s interior.

Lack of Maintenance: The existing system was not maintained over the years, leading to premature failure and costly repairs.

Solution Implementation:

  1. Stripping of Old Waterproofing System: The first step was the complete removal of the existing damaged waterproofing layers to create a stable base for the new system.
  2. Application of Torch-On Waterproofing System: A 4mm torch-on waterproofing membrane was installed, ensuring a seamless and highly durable protective layer. Torch-on membranes are ideal for flat roofs due to their resilience against water, weather, and mechanical stress.
  3. Silver Coat UV Protective Coating: To enhance longevity, a silver UV reflective coating was applied over the torch-on membrane. This coating provides additional protection from UV radiation, preventing premature degradation and extending the system’s lifespan.
  4. Maintenance Plan: A scheduled reapplication of the UV protective coating was recommended every two years to ensure long-term durability. With proper maintenance, the waterproofing system is expected to last over 25 years, with a 10-year guarantee on workmanship and materials.

Outcome:

  • Waterproof Integrity Restored: The building is now fully protected from leaks and water damage.
  • Enhanced Durability: The newly applied torch-on system, combined with UV protection, ensures the roof remains intact for decades with minimal upkeep.
  • Cost Savings: By preventing future leaks and structural issues, the client will save significantly on repair costs in the long run.
  • Increased Roof Longevity: With proper maintenance, the lifespan of the roofing system can extend beyond 25 years, securing the investment for the building owner.