Roof leaks are most commonly caused by damaged shingles, failed flashing, aging roofing materials, problems around roof penetrations, clogged gutters, chimneys or skylights, and ice dams. Even a small opening can allow water underneath your roofing system, where it may travel before eventually appearing as a stain or leak inside your home.
Missing, cracked, curled, or otherwise damaged shingles can expose the roofing materials underneath to rain and melting snow. Shingles may become damaged because of strong winds, hail, falling branches, improper installation, or normal wear over time. If the problem is limited to a small section of the roof, the affected shingles can often be replaced without replacing the entire roof.
Flashing is installed around vulnerable areas such as chimneys, skylights, valleys, vents, and roof-to-wall connections to direct water away from openings and joints. If the flashing becomes loose, cracked, corroded, improperly installed, or poorly sealed, water can get underneath the surrounding roofing materials and eventually enter the home.
Roofing materials naturally deteriorate after years of exposure to sunlight, rain, snow, ice, wind, and changing temperatures. Asphalt shingles can lose granules, become brittle, curl, or crack as they age, while sealants and other components can deteriorate as well. If an older roof begins developing leaks in multiple areas, it may be a sign that the roofing system is approaching the end of its useful life.
Plumbing vents, exhaust vents, fasteners, and other components that pass through the roof create potential entry points for water. Leaks can develop when vent boots crack, flashing becomes damaged, seals deteriorate, or penetrations were not installed correctly. Even a relatively small opening can allow enough water into the roofing system to eventually cause visible damage inside the home.
Chimneys and skylights are common locations for roof leaks because both require openings in the main roofing surface. Water can enter around damaged flashing, deteriorated seals, cracked masonry, or improperly installed components. A leak that appears beside a chimney or skylight does not necessarily mean the feature itself has failed, as the problem may actually originate in the surrounding roofing materials.
Gutters are designed to collect water from the roof and move it safely away from the home, but leaves, debris, ice, or damaged sections can prevent water from draining properly. When water backs up near the edge of the roof, it can contribute to moisture getting underneath roofing materials, particularly during periods of heavy rain or melting snow.
Ice dams can cause roof leaks during Ontario winters when heat escaping from the home melts snow higher on the roof and the water refreezes along the colder roof edge. As the ice builds up, additional meltwater can become trapped behind it and work its way underneath shingles instead of draining from the roof. Proper attic insulation, ventilation, and air sealing can help reduce the conditions that contribute to ice dam formation.
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