Location: Markham, Ontario
Roof Type: Inverted Flat Roof and Sloped Metal Roof
Project Scope: Replacement of an existing inverted 4-ply built-up roof with a new 2-ply SBS modified bitumen system while retaining the existing ballast, along with cleaning, priming, repairing, and coating the building’s aging sloped metal roof.
A new client in Markham contacted Industrial Roofing Services Limited with two separate roofing concerns at their building. The existing inverted flat roof had developed several ongoing leaks, while the sloped metal roof was also approaching the end of its service life and needed to be refurbished.
Rather than replacing both roofing systems outright, we worked with the client to develop an approach that addressed the problems with the inverted roof while allowing the existing river rock ballast to be retained and reused. At the same time, the sloped metal roof could be cleaned, repaired, primed, and recoated to give the aging surface a new finish.
The flat roof work focused on replacing the existing inverted 4-ply built-up roof with a new 2-ply SBS modified bitumen roofing system, providing the building with a completely renewed flat roof replacement. The sloped metal roof was then refurbished with a new jet black thermoplastic rubber coating. The client also chose to update the building’s appearance by replacing the perimeter sheet metal flashing with a jet black finish to complement the newly coated metal roof.
Our crew completed the flat and sloped roofing work, which included:
The building’s inverted roof had several ongoing leaks and required replacement, but the existing river rock ballast was still available for reuse. The new roof assembly was therefore completed in stages, with the new 2-ply SBS modified bitumen system installed first, followed by the separation sheet, 2-inch XPS insulation, and Fabrene fabric layer. The existing ballast was then reused over the completed assembly rather than replaced.
The sloped metal roof was nearing the end of its service life and required more than simply applying a new coating over the existing surface. Our crew first cleaned and prepared the metal, repaired the fastener holes, and applied the manufacturer-specified primer. Once the surface was properly prepared, the new jet black thermoplastic rubber coating was installed.
The project addressed both of the building’s roofing concerns with a combination of replacement and refurbishment. The leaking inverted 4-ply built-up roof was replaced with a new 2-ply SBS modified bitumen system and rebuilt perimeter detail, while the existing river rock ballast was retained and reused as planned. The sloped metal roof was also refurbished with a new coating, completing a major upgrade to the building’s commercial roofing system.
The sloped metal roof received a complete surface preparation, fastener repairs, manufacturer-specified primer, and new jet black thermoplastic rubber coating. Along with the new jet black perimeter sheet metal flashing, the work gave the building a significantly refreshed appearance while addressing the aging condition of both roofing systems.
