Roof Replacement & Reroof — York Region, Ontario

A complete roof replacement (or reroof) involves stripping your existing roof system down to the raw wood deck, correcting any structural deficiencies, and installing a new, multi-layered protective system. A roof is not just shingles; it is a complex assembly that includes underlayment, drip edges, ice and water shield, starter strips, flashing, ridge vents, and cap shingles. Together, these layers manage moisture, wind deflection, and attic thermal dynamics.

As an Owens Corning Preferred Contractor, Principal Roofing installs integrated roofing systems engineered to withstand winds up to 209 km/h (130 mph) and prevent ice damming. We inspect and replace rotted deck boards, lay heavy-duty synthetic underlayment, install ice & water shield along the eaves and valleys, and finish with high-durability architectural shingles featuring TruBond® sealant strips.

The Anatomy of a Quality Roof Replacement:

• Deck Preparation: The wood decking is inspected, re-secured, and rotted sections are replaced to ensure a solid foundation.
• Ice & Water Barrier: A self-adhering membrane is applied to eaves, valleys, and around chimneys to prevent leaks from ice dams or wind-driven rain.
• Synthetic Underlayment: A high-performance breathable barrier is laid over the remaining deck to provide a secondary layer of water protection.
• Starter Shingles: Specifically designed starter strips are installed at the edges to prevent shingle blow-offs.
• Architectural Shingles: Premium multi-dimensional shingles are nailed down using correct penetration patterns.
• Ventilation & Ridge Caps: Ridge vents are cut and capped to allow hot, humid air to escape the attic, preserving shingle life.