Ontario roofing decisions matter more than in most North American climates. Freeze-thaw cycling, heavy snow loads, ice damming, and significant summer UV exposure stress every roofing material differently.
Asphalt Shingles
Cost (GTA 2026): $8,000–$18,000 for average Toronto detached home (including tear-off and disposal)
Lifespan: 20–30 years depending on quality tier
Ontario climate performance: Good with proper installation and ventilation
Asphalt shingles dominate Ontario’s residential roofing market for one reason: cost. A complete re-roof on a 2,000 sq ft Toronto home runs $10,000–$14,000 for architectural-grade shingles.
The performance variable is almost entirely installation quality: proper underlayment (synthetic preferred over felt), adequate ventilation (1:150 ratio or 1:300 with vapour barrier), ice and water shield minimum 24" from eave edge (Ontario Building Code requires this for slopes under 4:12; smart installers use it on 6:12 and below).
IKO, BP (CertainTeed), and GAF are the major manufacturers with Ontario distribution and local warranty support.
Metal Roofing
Cost (GTA 2026): $18,000–$40,000 for same average home
Lifespan: 40–70 years
Ontario climate performance: Excellent — purpose-built for cold climates
Metal roofing costs 2–3x asphalt upfront, but often works out to less over a 40-year period when replacement costs are factored in. The case is strongest for homeowners planning to stay 20+ years.
Steel roofing in Ontario typically uses Galvalume-coated steel with factory paint finish. Standing-seam (hidden fastener) systems are preferred for longevity — exposed fasteners can become leak points as rubber grommets age.
Ice shedding: Metal roofs are notorious for releasing snow and ice suddenly. Snow guards are essential over entry doors, walkways, and driveways.
The Verdict for Ontario
For resale-oriented homeowners: asphalt is the rational choice. For long-term owners: metal roofing makes economic and environmental sense.
Roofing contractor recommendations for the GTA are actively discussed at home.renovation.reviews. LF Builders handles full exterior packages including roofing, eavestrough, soffit, and fascia.