Should I use metal roofing on my garage in Fredericton for snow shedding?

Yes, metal roofing is an excellent choice for a garage in Fredericton, particularly for its superior snow-shedding properties and long lifespan in the Saint John River valley's climate. Metal roofing costs more upfront than asphalt shingles but delivers 40 to 60 years of service compared to 25 to 30 years for architectural shingles, making it a strong long-term investment.

Fredericton receives substantial snowfall each winter, and the city's location in the Saint John River valley produces temperature swings that create challenging conditions for garage roofs. Daytime warming followed by overnight freezing can turn accumulated snow into heavy ice layers on asphalt shingle roofs, adding significant dead weight and creating conditions ripe for ice dams. Metal roofing sheds snow far more effectively because the smooth, low-friction surface allows snow to slide off under its own weight before it compacts and bonds to the roof. This keeps the structural load on your garage trusses well below the engineered design load and dramatically reduces ice dam formation.

In Fredericton, metal roofing for a garage costs $7 to $14 per square foot installed, compared to $4 to $7 for asphalt architectural shingles. For a standard two-car garage (24x24) with approximately 700 to 800 square feet of roof area, that translates to roughly $5,600 to $11,200 for metal versus $3,200 to $5,600 for shingles. The price difference narrows considerably when you factor in the fact that you will likely need to reshingle the garage once or twice during the lifespan of a single metal roof.

The two main types of metal roofing used on NB garages are standing seam and exposed-fastener panels. Standing seam is the premium option — concealed fasteners, cleaner appearance, better weather tightness, and longer lifespan — but it costs $10 to $14 per square foot installed. Exposed-fastener panels (ribbed or corrugated) are more affordable at $7 to $10 per square foot and are the most common choice for detached garages and workshops throughout the Fredericton area. Both types shed snow effectively.

There is one critical consideration with metal roofing and snow shedding: snow guards. When snow slides off a smooth metal roof, it comes down in heavy sheets that can damage anything below — vehicles parked near the garage, landscaping, fencing, walkways, or even people. You must install snow guards or snow rails above any doorways, walkways, adjacent driveways, or neighbouring property lines. Snow guards cost $300 to $1,000 installed on a typical garage roof and are not optional in an urban or suburban Fredericton setting where people and vehicles regularly pass near the garage.

For Fredericton's climate specifically, metal roofing offers several additional advantages beyond snow shedding. Metal is impervious to the freeze-thaw cycling that gradually deteriorates asphalt shingles, it handles the river valley's occasional high winds better than shingles (most metal roofing systems are rated for 120 to 180 km/h winds), and it sheds rain quickly during Fredericton's wet spring seasons. Metal roofing is also fire-resistant, which is a benefit if your garage stores gasoline, propane, or other flammable materials.

The main drawbacks to consider are noise and condensation. Rain and hail are louder on metal roofing, though this is typically not a concern for an uninsulated garage where some noise is expected. If your garage is insulated or has a finished ceiling, proper insulation between the roof deck and the interior will dampen sound effectively. Condensation can form on the underside of metal roofing in NB's humid climate — a vapour-permeable underlayment (such as synthetic breathable roofing felt) between the sheathing and the metal panels helps prevent this moisture from dripping onto stored items.

Metal roofing installation is a professional job, particularly for standing seam systems that require specialized tools and training. Even exposed-fastener panels need precise installation — incorrect screw placement, missing or misaligned sealant washers, and improper overlap at panel joints are common DIY mistakes that lead to leaks. Hire a roofing contractor experienced with metal installation in the Fredericton area. Need help finding a professional garage builder? New Brunswick Garages can match you for free through the New Brunswick Construction Network.