New Construction Roofing

New construction roofing is not simply the final stage of a build it is a critical structural component that determines how the entire building envelope performs for decades. The roof protects framing, insulation, mechanical systems, and interior finishes from environmental stress. In Southern Ontario, where heavy snow loads, strong wind gusts, freeze–thaw cycles, and high summer humidity create constant pressure on roofing systems, proper installation at the construction phase is essential. Mistakes made during new construction often remain hidden until structural deterioration begins.

A new roof must be engineered for long-term durability, drainage efficiency, and ventilation balance from the outset. At Aucoin Roofing, we treat new construction projects as system installations, not surface applications. Our focus is structural performance, compliance, and craftsmanship that supports the integrity of the entire build.

New construction roofing requires coordination with framing crews, insulation contractors, and building inspectors. Proper ventilation design is critical to long-term roof performance. Without balanced intake and exhaust airflow, moisture can accumulate in attic cavities during humid summers, while frost can develop during Ontario’s winter cold snaps. Over time, trapped moisture weakens roof decking and shortens the lifespan of roofing materials. We calculate ventilation ratios based on roof size and structural layout to ensure airflow meets Ontario Building Code requirements.

Flashing installation during new construction must be executed with precision. Valley flashing, step flashing, and counter flashing must be integrated before siding and exterior finishes are completed. Improper flashing installation during construction often leads to chronic leak issues years later. Our crews follow manufacturer specifications and fastening guidelines to ensure wind-uplift resistance and continuous waterproof protection. Aucoin Roofing operates with full WSIB coverage and liability insurance, providing builders and homeowners with compliance assurance and job-site safety throughout the construction process.

New construction provides the opportunity to install roofing systems correctly from the beginning without compromise:

• Architectural Asphalt Shingle Systems: For residential builds, architectural shingles provide a balance of wind resistance, aesthetic appeal, and cost efficiency. Installed with proper underlayment layering and ridge ventilation, these systems are engineered to withstand heavy snow accumulation and wind uplift conditions.
• Low-Slope & Flat Roofing Systems: For custom homes and builds that include flat sections, we install Polyglass two-ply self-adhered modified bitumen systems. This layered system is designed for durability and, when installed correctly, provides consistent water protection and reliable long-term performance on low-slope areas.
• Flashing & Drainage Infrastructure Integration: Chimney flashing, wall transitions, skylights, and ventilation penetrations are installed as engineered assemblies. Proper integration prevents future leak points and protects structural framing beneath.
• Ventilation & Insulation Coordination: Intake and exhaust ventilation systems are installed in coordination with attic insulation planning. Balanced airflow protects decking from condensation buildup and improves energy efficiency throughout the structure.

Roofing systems installed during construction must account for structural load distribution, drainage efficiency, and thermal movement from the outset. Failure to design for these conditions leads to premature wear and long-term structural costs.

New construction roofing is an opportunity to install a system that performs predictably under regional stress. At Aucoin Roofing, we approach every build with disciplined planning, technical expertise, and a focus on structural integrity. The result is a roofing system designed not just for completion but for decades of reliable protection

New builds require coordination, sequencing, and disciplined installation standards.

1. Builder & Structural Plan Review: We begin by reviewing architectural drawings, roof pitch, load requirements, and ventilation design. Early coordination ensures roofing components integrate seamlessly with framing, insulation, and mechanical planning.
2. Deck Preparation & Structural Verification: Before installation, we inspect roof decking for alignment, fastening integrity, and moisture exposure. Proper substrate preparation prevents premature shingle failure and ensures structural stability under snow load.
3. Weatherproofing Layer Integration: We install underlayment systems, ice and water shield at eaves and valleys, and protective membranes tailored to Southern Ontario’s freeze–thaw and wind-driven rain conditions. This step creates the foundation of long-term waterproofing performance.
4. Precision Material Installation: Shingles, metal systems, or specialty materials are installed using manufacturer-certified fastening patterns and ventilation integration. Correct ridge venting, flashing placement, and fastening depth ensure warranty compliance and durability.
5. Final System Inspection & Documentation: Upon completion, we conduct a multi-point inspection to verify drainage pathways, flashing integrity, and ventilation balance. Builders and homeowners receive documentation supporting warranty protection and code compliance.