Stucco and EIFS Exterior Cladding Guide for Ontario Homes 2026
Stucco and EIFS are popular in the GTA. Both have distinct performance characteristics and common failure modes Ontario homeowners need to understand.
Traditional Stucco vs. EIFS
Traditional three-coat stucco: Cement-based plaster over metal lath. Hard, breathable, durable (50+ years if maintained). Susceptible to cracking from thermal cycling.
One-coat stucco: Single thicker layer, faster installation. More common in newer GTA builds.
EIFS (Dryvit, Parex, Sto):
- Rigid foam insulation board + fibreglass mesh + acrylic finish
- Provides R-value, flexible, wide colour range
- Barrier EIFS (older): High failure rate — trapped moisture destroys sheathing
- Drainage EIFS (current standard): Drainage plane behind foam — dramatically better performance
Common GTA Stucco Problems
| Problem | Likely Cause | Action |
|---|---|---|
| Hairline cracks | Thermal cycling (normal) | Seal with elastomeric caulk |
| Map/pattern cracking | Shrinkage or substrate movement | Fill and repaint |
| Delamination (bulging) | Water behind stucco, freeze-thaw | Section removal and replacement |
| Window perimeter staining | Failed caulk | Recaulk with polyurethane |
| Efflorescence | Water moving through stucco | Diagnose water source first |
Repair vs. Full Re-Clad
Repair: Damage under 20-30% of surface, dry substrate, profile can be matched.
Full re-clad: Widespread delamination, rotted sheathing/framing, or upgrading to drainage EIFS for energy performance.
Re-cladding triggers OBC requirements for air barrier and vapour control.
Cost Guide
| Scope | Cost |
|---|---|
| Spot repairs (per crack, 3-ft section) | $200-600 |
| Window surround recaulk and repair | $300-800 |
| Full stucco repaint (2-storey home) | $3,500-8,000 |
| Section replacement (per 100 sq ft) | $2,000-5,000 |
| Full re-clad to drainage EIFS (2,000 sq ft) | $30,000-70,000 |
Find stucco and cladding specialists on home.renovation.reviews.
LF Builders handles stucco repair and re-cladding across the GTA. lfbuilders.ca