Ontario Roofing Material Comparison and Replacement Guide 2026
Replacing a roof is a major investment. Here is how all major roofing materials compare on performance in GTA climate conditions and 2026 installed costs.
GTA Roofing Challenges
The GTA climate subjects roofs to: 45+ freeze-thaw cycles/year, ice dam risk, UV degradation, wind uplift, and heavy snow loads. The best Ontario roofing materials address all of these.
Material Comparison
| Material | Lifespan | GTA Climate | Installed Cost |
|---|---|---|---|
| 3-tab asphalt | 20-25 yr | Adequate | $5-8/sq ft |
| Architectural asphalt | 30-50 yr | Good | $7-11/sq ft |
| Class 4 impact asphalt | 30-50 yr | Very good | $9-14/sq ft |
| Standing seam metal | 50+ yr | Excellent | $15-25/sq ft |
| Steel shingle | 50 yr | Excellent | $12-20/sq ft |
| Cedar shakes | 25-35 yr | Good (with maintenance) | $12-20/sq ft |
| Synthetic slate/shake | 50 yr | Excellent | $18-30/sq ft |
OBC Ice and Water Shield Requirements
Minimum 900mm (3 ft) from exterior wall up slope. Extends to 600mm inside heated space in ice dam zones. This is mandatory — do not accept a bid without ice and water shield.
Ventilation Requirements
Minimum 1:300 NFA ratio (1:150 for balanced systems). Ridge vent + soffit vent combination is most effective for GTA ice dam prevention.
Building Permit
Required for roof replacement in most Ontario municipalities.
Cost Guide (1,800 sq ft home)
| Type | Total Cost |
|---|---|
| Architectural shingles (tear-off + replace) | $12,000-20,000 |
| Standing seam metal | $27,000-45,000 |
| Synthetic slate/shake | $32,000-54,000 |
Find GTA roofing contractors on home.renovation.reviews.
LF Builders has replaced roofs across the GTA for over 50 years. lfbuilders.ca