Toronto has thousands of homes with exterior stucco applied in the 1990s and 2000s — and a significant number of them have moisture problems behind that stucco that the homeowners don’t know about yet.
Traditional Stucco vs. EIFS
Traditional three-coat stucco (Portland cement-based) is extremely durable when properly detailed. EIFS (Exterior Insulation and Finish System — “synthetic stucco”) is a different product: a foam insulation board covered with a reinforced polymer coating. EIFS that was installed in the 1990s–2000s with inadequate flashing and drainage detailing is the problem.
Why EIFS Fails
EIFS should be installed as a “drainable” system with a gap between the foam and the wall sheathing, plus proper flashing at all penetrations (windows, doors, corners). Early installations often weren’t. When water gets in and can’t drain out, it saturates the sheathing and framing behind — often for years before visible damage appears.
Warning Signs
- Stucco cracking at corners of windows and doors
- Stucco bulging or delaminating
- Interior damp spots near exterior walls after rain
- Soft spots in the wall when you press
What to Do
Hire an EIFS inspector. They use moisture meters and probe around penetrations. If problems are found, the scope can range from localized repairs ($3,000–$8,000) to full re-cladding ($40,000–$100,000+ depending on extent of damage).
Pre-purchase: if you’re buying a Toronto home with EIFS stucco built in the 1990s–2000s, get a specialized EIFS moisture inspection before closing.
Discussion at home.renovation.reviews.