What causes ice dams
Heat escaping into your attic melts snow on the upper roof. Water runs down and refreezes at the cold eaves, forming a dam that forces water under shingles and into your home.
Homeowner Guide
Ice Dam Prevention in Ontario
Why ice dams form on Ontario roofs and how proper ventilation, insulation, and ice-and-water shield prevent costly winter damage.
Ventilation is critical
Balanced intake and exhaust ventilation keeps attic temperatures close to outdoor air, reducing melt-freeze cycles. Ridge vents paired with soffit intake are the standard Trident installs on replacements.
Ice-and-water shield
Ontario building code requires ice-and-water membrane in valleys and eaves. Trident extends protection into critical transition zones beyond minimum code for added security.
Signs you already have a problem
Icicles along eaves, water stains on ceilings after thaw, or ice buildup behind gutters indicate existing damming. Address before the next freeze cycle.
Want a professional opinion on your roof?
Book Free Inspection