Case Study: Roof Leak Restoration at Delcairn Centre

Location: Delcairn Centre, Kloof
Date: 2023 (Restoration by Previous Contractor)
Issue: Roof Leaks discovered during new shop installation

Background:

After a fire incident at Delcairn Centre, the roof was restored by a different contractor. However, upon refurbishing the space for a new shop, roof leaks were discovered. A detailed inspection revealed that the existing waterproofing system had been compromised, leading to water infiltration and damage.

Problem Diagnosis:

Upon opening up the roof, the following issues were identified:

  1. Holes in the Waterproofing: The inspection found holes at the bottom edge of the isolation system, compromising its integrity.
  2. Water Accumulation: The current waterproofing solution was not designed to withstand standing water. Instead, it was intended for water to flow rapidly over its surface and exit the building structure efficiently.
  3. Blocked Water Flow: The batten installed at the edge of the roof was obstructing water from flowing out, causing accumulation. This standing water is now leading to internal decay and damage.

Solution:

To resolve the issue and prevent future leaks, the following steps are recommended:

  1. Torch-On Waterproofing System: Upgrade the current isolation system by applying a torch-on waterproofing solution. This method provides a durable and resilient barrier, ensuring any water that reaches the surface is effectively guided away.
  2. Adjust Water Flow Design: Modify the roofing system to allow water to exit the building smoothly. The aim is to channel water over the edge of the wall or into the gutter, ensuring it does not accumulate.
  3. Prevention of Common Design Flaw: This case highlights a common issue in similar building designs where batten placements inadvertently block water exit paths. Ensuring the flow design is unobstructed is crucial for effective waterproofing.

Outcome:

By implementing the torch-on waterproofing system and improving water exit pathways, the risk of future leaks and decay is minimised. This approach restores the roof’s integrity and sets a precedent for addressing similar architectural issues in other buildings.

This case is an example of how critical proper inspection and understanding of waterproofing systems are to maintain the longevity and safety of building structures.