The Best Metal Roof for Snow and Cold Climates
Quick answer
Metal is one of the best roofs for snow country: its smooth, interlocking surface sheds snow to reduce load and ice dams, and aluminum shrugs off the freeze-thaw cycling that cracks other materials. Interlock installs with eave protection against ice dams, offers snow guards for controlled release, and — being aluminum — never rusts from meltwater and road salt.
What snow and cold do to a roof
Heavy snow adds enormous weight to a roof and, as it melts and refreezes, forms ice dams that back water up under the roofing. Freeze-thaw cycling — water expanding as it freezes — pries apart materials that absorb moisture, and repeated cold stresses coatings. In many northern regions, road salt and de-icing chemicals add a corrosion challenge. A roof for snow country has to shed load, resist ice dams, and endure freeze-thaw and salt.
Why metal excels in the snow
A metal roof's hard, smooth, interlocking surface doesn't grip snow the way rough shingles do, so snow slides off in sheets rather than piling up — less weight on the structure and less standing snowpack to feed ice dams. That's why metal is so common on cabins and chalets. Interlock also installs ice-and-water membrane at the eaves to guard the vulnerable edge, and the roof is designed to work with proper attic ventilation, the real key to preventing ice dams on any roof.
Freeze-thaw, salt, and snow guards
Aluminum adds durability the cold demands: it doesn't absorb water, so freeze-thaw can't pry it apart, and it cannot rust from meltwater or road salt. Where sliding snow could hit a walkway, doorway, or driveway, Interlock offers color-matched cast-aluminum snow guards for a gradual, controlled release. Together — snow shedding, eave protection, ventilation, freeze-thaw-proof aluminum, and snow guards — the system is built for a lifetime of northern winters.
Frequently Asked Questions
Is a metal roof good for snow?
Yes — among the best. Its smooth, interlocking surface sheds snow rather than letting it accumulate, reducing roof load and the snowpack that feeds ice dams. Metal roofs are a favorite in heavy-snow regions.
Do metal roofs prevent ice dams?
They help by shedding the snow that feeds ice dams, but no roof is immune. Interlock installs ice-and-water eave protection, and proper attic ventilation and insulation are the real keys to preventing ice-dam leaks.
Does freeze-thaw damage a metal roof?
No. Aluminum doesn't absorb water, so the expansion of freezing water can't pry it apart, and it doesn't rust from meltwater or road salt — making it well suited to cold, snowy climates.
Do I need snow guards in snow country?
You do where sliding snow could hit a walkway, doorway, driveway, or landscaping. Interlock offers color-matched snow guards for a controlled release; a professional plans their placement for your roof.
Sources
- CCMC 10475-R — Interlock (NBC 2015) — Canadian cold-climate compliance
Explore Interlock Metal Roofing
Last reviewed 2026-07-11 · Reviewed by Scott Plumptree, Director of Marketing