How to Calculate Roof Vents for Your Ontario Home

Ontario winters make attic ventilation critical. Without adequate ventilation: (1) Warm air from the living space condenses on cold roof sheathing, causing mould and rot. (2) Ice dams form at the eaves — snow melts near the warm ridge and refreezes at the cold eaves, causing leaks. (3) In summer, an unventilated attic can reach 60°C+, degrading shingles and raising cooling costs. Proper ventilation extends shingle life by 5–10 years. (Serving Richmond Hill, Ontario.)

Why Attic Ventilation Matters in Ontario

Ontario winters make attic ventilation critical. Without adequate ventilation: (1) Warm air from the living space condenses on cold roof sheathing, causing mould and rot. (2) Ice dams form at the eaves — snow melts near the warm ridge and refreezes at the cold eaves, causing leaks. (3) In summer, an unventilated attic can reach 60°C+, degrading shingles and raising cooling costs. Proper ventilation extends shingle life by 5–10 years. (Serving Richmond Hill, Ontario.)

How Many Roof Vents Do I Need? Ontario Guide | Richmond Hill

Ready to hire a trusted contractor in Richmond Hill? Browse home services in Richmond Hill on Protasker — licensed, WSIB-insured pros available same day.