Commercial roof with rust problems and leaks

Commercial roof with rust problems and leaks mairangi bay12
Commercial roof with rust problems and leaks mairangi bay02
Commercial roof with rust problems and leaks mairangi bay10

Cost-Effective Solution for a Leaking Commercial Roof

A commercial office building was experiencing significant rust issues and leaks. While a full re-roof would have been an ideal long-term solution, the property is set for redevelopment within the next 10 years, making a $150,000 re-roof impractical. Our team at Cowperthwaite Roof Restorations provided a cost-effective alternative that resolved the leaks and extended the roof’s lifespan.

Project Overview:

This project involved a roof restoration on a large block of units in Epsom. The roof, which had been previously restored, required a refresh to maintain its protective qualities and enhance its appearance. Our work included:

Step 1: Structural Repairs & Leak Prevention

  • Cut out and replaced rusted sheets along the gutter line with slip sheets.
  • Removed ridge cappings, cleaned rusted areas, and installed stop ends with new wider ridge caps.
  • Replaced all old fixing screws with 65mm Tec screws and washers for a secure fit.
  • Installed back trays around all roof penetrations to prevent further leaks.

Step 2: Surface Preparation & Rust Treatment

  • Applied a moss treatment to eliminate organic growth.
  • Pressure cleaned the roof to remove dirt, debris, and loose rust.
  • Treated all rust-affected areas with Blackguard Rust Converter to prevent further corrosion.

Step 3: Protective Coating Application

  • Applied one coat of primer for adhesion and protection.
  • Finished with two topcoats in Colour Cloud, creating a durable, weather-resistant seal.

A fully restored and leak-free roof, delivering the protection needed at a fraction of the cost of a full re-roof. The building owners and tenants are now secure in the knowledge that the roof is weatherproof and stable for the years ahead.