Ice dams form when heat escaping through the attic warms the roof deck and melts snow. The meltwater runs down to the cold eaves, where it refreezes. As the ice builds, it traps subsequent meltwater, forcing it back under shingles and into the building. The result is water damage to ceilings, walls, insulation, and electrical systems. Ice dams are among the most common winter roofing emergencies in the Outaouais.
Why Metal Roofing Eliminates Most Ice Dam Risk
Metal roofing addresses ice dam formation at the surface level. Snow doesn’t bond to the smooth metal finish the way it accumulates on granular shingles. Most snow loads slide off before they build to a depth that creates significant meltwater. The remaining risk, from attic heat escape, can be addressed through proper insulation and ventilation, which Cossette inspects and recommends corrections for during every estimate.
Asphalt Shingles and Ice Dams: Managing the Risk
For homes that retain shingles, ice dam risk is managed through three measures: ice-and-water membrane at the eaves (standard in Cossette installations), proper attic insulation to prevent heat escape, and adequate soffit and ridge venting to maintain a cold roof deck temperature. These measures significantly reduce but do not eliminate ice dam risk in the Outaouais.
Snow Guards on Metal Roofs in Gatineau
When snow slides from a metal roof, it does so suddenly and in volume. Snow guards, rows of metal brackets or bars fastened to the roof, break up the snow sheet and release it gradually. Cossette plans snow guard placement above all entries, walkways, and areas where sliding snow would create a hazard. This is a required component of every metal roofing installation in the Outaouais.
Frequently Asked Questions
Can Cossette remove existing ice dams in an emergency in Gatineau?
Yes. Cossette provides 24/7 emergency service in Gatineau and Ottawa including response to active ice dam infiltration. Call 819-777-7177. Temporary waterproofing is applied to stop active water entry until a permanent solution is completed.
If I have a metal roof, will I ever get ice dams?
Rarely. The most common residual ice dam scenario on metal roofs occurs at snow guard locations, where snow is held and can accumulate. Proper snow guard design by Cossette minimizes this risk. Ensuring good attic insulation and ventilation eliminates the heat-escape component entirely.
How much does ice dam damage repair cost in Ottawa or Gatineau?
Costs vary widely by severity, from a few hundred dollars for minor ceiling repairs to thousands for water-damaged insulation, drywall, and electrical work. The roof repair component depends on the extent of infiltration. Cossette provides assessment and repair of the roof element; interior damage is coordinated with renovation contractors.