7 Ways to Help Prevent Ice Dams

Did You Know?

Ice dams are caused when melted snow re-freezes after uneven heat loss from your home. This causes the roof to warm above freezing temperature, allowing snow to melt and then re-freeze before it reaches the roof’s edge. If this cycle repeats consistently, an ice dam forms and water collects behind it. Above all, ice dams can cause expensive water damage.

Preventing Ice Dams:

• Keep the attic well ventilated. One-third square metre of free ventilation opening is recommended for every 45 square metres of attic space.
• Seal air leaks to prevent warm air leakage from plumbing vents, junction boxes from ceiling fixtures and attic hatches.
• Keep the attic floor well insulated (between 40 and 56 centimetres of insulation) to minimize the amount of heat rising into the attic from below. 
• Clean leaves and other debris from gutters before the first snow. This will help prevent ice buildup in your gutters. 
• Consider using an ice shield under your shingles when your house is getting re-roofed.
• Use a roof rake to clear the snow above the gutter. Clear about one metre above the gutter to allow water to drain freely into the gutter.
• Gutter guards help prevent debris such as leaves, twigs, and dirt from clogging gutters, which can lead to ice buildup. With clean, unobstructed gutters, water has a clear path to flow, reducing the risk of ice dams forming.

Safety First

During cold winter months, the icicles on your home’s eaves may be a sign that a ridge of ice is forming at the edge of the roof. This ridge, also known as an ice dam, can prevent melting snow from draining properly. If an ice dam forms, sprinkle a melting compound to break it up. Avoid using traditional rock salt, as it may cause further damage and faster deterioration of your gutters.

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