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Full Commercial Roof Replacement in Markham

erial view of the building showcasing the roof during the Full Commercial Roof Replacement in Markham, featuring a 4-ply built-up roof.

Project Specifications

  • Type of Project: Full Roof Replacement

  • Roof area: 49,280 square feet.

  • Deck Type: Steel

  • Roof Membrane (field area): 1 ply #15 perforated organic felt paper plus 3 plies type 4 glass felt paper mopped in hot asphalt, asphalt flood coat and ⅜” pea gravel

  • Flashing Membrane (perimeter and roof upturns): 2-ply SBS modified bitumen

  • Insulation: 1.5″ ISO mechanically fastened to the steel deck substrate, 0.5″ perlite insulation applied in hot asphalt

  • Vapour retardant: reinforced kraft paper applied in adhesive

A 4 ply built-up roof is a durable, time-tested roofing solution ideal for commercial properties requiring longevity and robust protection. At 100 Bentley Street in Markham, we implemented this system to meet the client’s needs for reliability and Class A fire protection. By combining multiple layers of felt paper and glass felts mopped in hot asphalt with a gravel finish, the 4 ply built-up roof provided the perfect solution for addressing this property’s structural and functional challenges.

Commercial Roof Client           artisan logo

Address:

100 Bentley Street

Markham, Ontario

Parapet walls sloped to prevent ponding water and maintain the integrity of the 4-ply built-up roof system.
Damage caused by ponding water on the parapet before the commencement of the 4-ply built-up roof replacement in Markham.
Equipment on the roof prior to the commencement of work during the 4-ply built-up roof replacement in Markham.
erial view of the building showcasing the roof during the Full Commercial Roof Replacement in Markham, featuring a 4-ply built-up roof.

Client Goal/Purpose of Project

The client, a property manager for 100 Bentley Street in Markham, sought a durable roofing solution to restore the building to base-building condition after its previous tenant vacated. The roof required a complete replacement to address extensive damage caused by years of use, including numerous penetrations left by large-scale printing equipment, HVAC systems, and other machinery. Additionally, the client prioritized a Class A fire-protection system and long-lasting membrane performance. The goal was to ensure the building was ready for future occupancy while eliminating ongoing structural issues like leaks and water damage.

Key Challenges

The project presented a range of challenges across management/execution and planning that required a tailored approach to overcome.

Planning

The client required a roofing system with Class A fire protection, capable of providing both safety and longevity.

The roof replacement project had to address not only functional issues like leaks and water runoff but also prevent future staining of the light-colored precast exterior.

Achieving energy efficiency and ensuring thermal performance required a meticulous installation of insulation layers.

Management & Execution

The roof was cluttered with redundant HVAC units, a large make-up air system, and related gas piping. Coordinating the safe disconnection, removal, and craning of this equipment required collaboration with the client’s HVAC and craning contractors.

Years of heavy equipment use had left numerous penetrations in the steel deck, demanding extensive patching to restore the substrate before the new membrane installation.

The parapet walls were flat-topped, 12–14 inches wide, and susceptible to ponding water, which had caused leaks, staining on the exterior precast panels, and deterioration at metal joints.

Before roof replacement

Here’s a look at the roof’s condition before the replacement, including abandoned equipment and structural challenges that needed to be addressed

Solutions for this Full Commercial Roof Replacement in Markham

To tackle these challenges, the Elite Roofing team implemented strategic solutions to meet the client’s goals and enhance the roof’s performance for long-term reliability.

Collaborated with HVAC and craning contractors to safely disconnect and remove redundant HVAC units and associated gas piping, clearing the roof for repairs and new installations.
Patched penetrations across the steel deck to restore its structural integrity before the membrane installation.
Installed sloped wood blocking on the parapet walls, resolving ponding water issues and eliminating the risk of leaks and staining on the precast panels.
Applied a 4-ply built-up roof system featuring a flood coat of asphalt and pea gravel, ensuring longevity, durability, and Class A fire protection.
Installed a 2-ply SBS modified bitumen flashing membrane to improve durability and water resistance at perimeters and roof upturns.
Mechanically fastened 1.5″ ISO insulation to the steel deck substrate, followed by a 0.5″ perlite insulation layer applied in hot asphalt for energy efficiency and thermal performance.

By addressing structural deficiencies and implementing these advanced roofing solutions, Elite Roofing successfully transformed the roof at 100 Bentley Street into a robust, efficient, and future-ready system, meeting the client’s requirements for safety and longevity.

Contact Elite Roofing for your next roofing project!

If you’re experiencing ponding water issues or have a recent vacancy and want a roof assessment to provide an estimate to restore the roof to base building condition, and want to know more about how we can help, visit our contact page. We’re available through live chat during working hours and by email 24/7. That’s the Elite Advantage.

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