Gatineau averages over 230 cm of snowfall annually. Combined with the freeze-thaw cycles that can occur dozens of times per winter, roofing materials are subjected to enormous mechanical and thermal stress. The leading causes of premature roof failure in the Outaouais are ice dam infiltration, freeze-thaw membrane cracking, and snow load exceeding design capacity on older flat roofs.
Metal Roofing: The Superior Snow-Climate Option
Metal roofing — particularly standing seam steel — is the best performer in Gatineau’s snow environment. The smooth, low-friction surface allows snow to slide off before accumulating to dangerous loads. Metal doesn’t absorb moisture, doesn’t crack under freeze-thaw stress, and has no granules to lose. It also eliminates ice dams by preventing the temperature differential that causes meltwater to refreeze at the eaves.
Asphalt Shingles: How to Maximise Performance in Snow Country
If shingles are chosen over metal, three elements are critical for Gatineau’s climate:
(1) Ice-and-water membrane for the first two metres from the eave — mandatory in Quebec and essential for ice dam protection.
(2) Proper attic insulation and ventilation to prevent the heat escape that creates ice dams.
(3) A minimum 130 mph wind-rated architectural shingle product for wind storm resistance.
Flat Roofs: Elastomeric Membrane for Snow Loads
Flat roofs in Gatineau must use elastomeric SBS membrane — a material engineered to remain flexible at -30°C, preventing the cracking that other membrane types experience. Flat roofs also require regular snow removal in heavy accumulation years to prevent overload on the structural deck.
Frequently Asked Questions
How much snow can a typical residential roof in Gatineau safely hold?
Most residential roofs in Quebec are engineered for a minimum 40 psf (pounds per square foot) ground snow load as required by the National Building Code. However, older homes or those with flat/low-slope sections should be assessed individually. When snow accumulation is extreme, professional removal is advisable.
What is an ice dam and how does it damage a roof?
An ice dam forms when heat escaping through the roof deck melts snow, which refreezes at the cold eaves. The resulting ice barrier prevents meltwater from draining, forcing it under shingles and into the building. The fix requires both addressing the immediate infiltration and correcting the attic heat loss causing the melting.
Can Cossette Roofing help with snow removal emergencies in Gatineau?
Yes. Cossette provides 24/7 emergency roofing service in Gatineau and Ottawa — including response to snow overload and ice dam infiltration. Call 819-777-7177 our visit our website any time.