Flat roofs are common on garages, walk-outs, additions, and certain residential designs, but they require a different approach than traditional sloped roofing. Because water does not naturally run off as quickly, these systems rely on proper drainage, correct layering, and careful installation to remain watertight over time. When a flat roof begins to fail, it can lead to moisture entering insulation, interior finishes, and structural components below.

At Aucoin Roofing, we focus on installing flat roofing systems that are designed for long-term performance rather than short-term fixes. We specialize in Polyglass self-adhered modified bitumen systems, a proven solution for residential and light commercial applications. When installed correctly, these systems create a durable, watertight surface that protects your home and reduces the likelihood of recurring repairs.

Installing a flat roof is not just about applying material — it is about making sure the entire system performs properly over time. One of the most common causes of flat roof failure is standing water. Even small low areas can collect water after rain or snowmelt, which leads to premature wear and increases the risk of leaks. That is why proper slope and drainage are built into every installation.

We also focus on areas where problems typically occur, such as roof edges, vents, drains, and transitions. These points require careful detailing to ensure water is directed away from vulnerable areas. Our team installs each component with attention to sequencing and sealing so the system works as a whole. Aucoin Roofing is fully insured and covered by WSIB, and all work is completed by our in-house crew to ensure consistent quality and long-term reliability.

Flat roofs are not one-size-fits-all. The system needs to match the structure, usage, and long-term expectations of the homeowner. At Aucoin Roofing, we focus on a proven solution that delivers consistent performance.

• Polyglass Self-Adhered Modified Bitumen Systems: Polyglass modified bitumen is a layered roofing system designed for strength, flexibility, and long-term waterproofing. The self-adhered application method eliminates the need for open flame installation, making it a cleaner and more controlled process. When properly installed, it creates a continuous protective surface that resists water intrusion and holds up well over time.
• Layered Waterproofing Protection: Modified bitumen systems are built in layers, which provides added durability compared to single-layer systems. This layered approach helps protect against wear, surface damage, and long-term exposure while maintaining consistent performance across the entire roof area.
• Reinforced Seams & Transitions: Seams, edges, and transitions are some of the most critical parts of any flat roof. These areas are reinforced and sealed carefully to prevent water from working its way into the system. Proper detailing at these points plays a major role in long-term performance.
• Residential & Light Commercial Applications: These systems are well suited for garages, additions, porches, and select light commercial structures. When installed correctly, they provide a reliable solution for low-slope areas that require durable, watertight protection.

Flat roofs see constant exposure to the elements sun, rain, snowmelt, and debris. Without engineered details, a flat system can quickly become a lifecycle liability instead of an asset protector. Aucoin Roofing approaches flat roofing with disciplined planning, technical depth, and a focus on predictable performance throughout the roof’s lifespan.

Whether you are completing a commercial build, replacing a garage roof, or updating a low-slope section of a residential property, our flat roofing solutions are designed to integrate with the structure, not simply over it. From flashing detail, and drainage validation, we deliver systems that protect assets, minimize maintenance, and preserve value.

Flat roofing requires proper sequencing and attention to detail. Our process is designed to ensure each system is installed correctly from the start.

1. Roof & Drainage Evaluation: We begin by inspecting the roof deck and confirming that water will drain properly. Identifying low spots early helps prevent future pooling and extends the life of the roof.
2. Surface Preparation & Deck Repair: We prepare the substrate by repairing any soft or damaged areas and ensuring a clean, stable surface. Proper preparation is critical to ensure full adhesion and long-term performance.
3. System Planning & Material Layout: We plan the installation of the Polyglass system, including layer placement and transition detailing. This ensures the system is installed consistently across the entire roof.
4. Precision Installation: Each layer is applied using manufacturer-approved methods to ensure proper adhesion and sealing. Special attention is given to seams, edges, and roof details where failures are most likely to occur.
5. Final Inspection & System Check: Once complete, we inspect the full roof to confirm proper installation, drainage, and sealing. This ensures the system is ready to perform as intended.