Roof repair Toronto serves as a critical secondary barrier beneath shingles or other outer roofing materials, protecting the decking from moisture intrusion. When underlayment becomes damaged due to prolonged leaks, storm impact, or aging materials, the integrity of the entire roofing system is compromised. Signs of underlayment damage often include persistent leaks despite intact shingles, damp attic insulation, mold growth, or visible sagging in roof decking. Because underlayment is not visible from the exterior, identifying damage typically requires lifting shingles in affected areas. Once exposed, torn, brittle, or water-saturated sections must be carefully removed to prevent further spread of moisture.

Repairing underlayment involves stripping away the outer roofing material in the damaged section, cutting out compromised underlayment, and installing a new moisture-resistant layer securely fastened to the decking. Synthetic underlayments are commonly preferred for their durability and resistance to tearing compared to traditional felt paper. During replacement, proper overlap and sealing are essential to maintain water-shedding functionality. Flashing around penetrations should also be inspected and resealed during the process to ensure complete protection. For a broader understanding of layered roof components, see Roofing underlayment. Addressing underlayment damage promptly prevents structural rot and preserves the overall performance of the roofing system.

Ensuring Long-Term Protection After Underlayment Repair

After completing repairs, reinstalling shingles correctly and ensuring proper alignment is crucial for restoring the roof’s waterproof barrier. Ventilation should also be evaluated, as trapped moisture often contributes to underlayment deterioration. Scheduling periodic inspections and maintaining proper drainage will help extend the lifespan of both the underlayment and the exterior roofing materials. By taking a comprehensive approach, homeowners can prevent recurring moisture issues and maintain structural integrity.