Many of the most beautiful homes in Toronto and the GTA were built decades ago—and they’re now facing a common challenge: aging asphalt shingle roofs that need replacing. If you own an older home in Ontario, metal roofing is one of the best replacement options available — but there are some important considerations specific to older properties. This complete guide covers everything you need to know.
Why Older GTA Homes Are Prime Candidates for Metal Roofing
The GTA has an enormous stock of older homes—post-war bungalows in Etobicoke and Scarborough, century homes in established Toronto neighborhoods, and mid-century brick colonials in Mississauga and Brampton. Many of these homes were built in the 1940s, 50s, 60s, and 70s—which means their original roofs have been replaced once or twice already.
For homeowners of these properties, the question isn’t just “which roofing material?” but “which material will I never have to replace again?” Metal roofing answers that question definitively — with a 50+ year lifespan, installing metal roofing on an older home today means the roof will likely outlast the current homeowner’s tenure in the property.
There’s also a practical reality: as GTA homes age, the cost and disruption of repeated roof replacements become increasingly burdensome. Metal roofing eliminates that cycle permanently.
Key Considerations for Metal Roofing on Older Homes
Older homes require some additional considerations before metal roofing installation. Here’s what to be aware of:
Roof Deck Condition
This is the most important factor for older homes. The roof deck — the wooden surface beneath the roofing material — deteriorates over decades. In older Ontario homes, particularly those built before 1970, the roof deck may have:
Rot or soft spots from years of moisture exposure.
Inadequate thickness or spacing for modern roofing systems.
Multiple layers of old roofing material that have been installed over each other.
Old wood plank decking rather than modern plywood or OSB sheathing.
Before installing metal roofing on an older home, a thorough inspection of the roof deck is essential. Any damaged, rotted, or inadequate sections must be repaired or replaced before the metal roofing system is installed. This is not an optional step — it is the foundation of a long-lasting installation.
Structural Capacity
Older homes were built to the structural standards of their era — which may differ from modern requirements. However, metal roofing is actually one of the most structurally friendly options for older homes because it is significantly lighter than many alternative roofing materials.
A typical metal tile roof weighs approximately 1.5–3 pounds per square foot—far lighter than clay tiles (8–12 lbs/sq ft) and even comparable to or lighter than asphalt shingles (2–4 lbs/sq ft). This lightweight nature makes metal roofing particularly well-suited to older homes where structural loading is a consideration.
Ventilation
Proper attic ventilation is critical for any roofing system, but older homes often have inadequate ventilation by modern standards. Poor ventilation causes heat and moisture buildup in the attic, which can damage roof decking, reduce energy efficiency, and even contribute to ice dam formation.
Before or during metal roofing installation on an older home, ventilation should be assessed and upgraded if necessary. This typically involves ensuring adequate ridge ventilation and soffit ventilation—and, in some cases, adding additional ventilation points.
Heritage and Character Considerations
Many older GTA homes have architectural character that homeowners want to preserve. Metal roofing offers excellent options that complement traditional architecture:
Metal tiles in traditional profiles—the Monterrey wave pattern and Bond square tile pattern—both complement the architectural character of older GTA homes beautifully. In charcoal, mocha brown, or terra cotta, they blend naturally with brick exteriors and established streetscapes.
Standing seam on heritage properties—when done thoughtfully, standing seam metal roofing can complement heritage architecture, particularly on homes with strong vertical lines.
Color matching—modern metal roofing comes in an extensive range of colors, making it possible to match or complement the existing exterior palette of an older home precisely.
Can Metal Roofing Be Installed Over Existing Shingles on an Older Home?
This is a common question for older homeowners—and the answer requires careful consideration. While metal roofing can often be installed over one layer of existing asphalt shingles, older homes present additional complexity:
Multiple shingle layers — many older homes have had two or three layers of shingles installed over the decades. If this is the case, all layers should be removed before metal roofing is installed, as the combined weight and uneven surface can compromise the installation.
Unknown underlayment condition — older underlayment materials may have degraded and should be replaced as part of the installation.
Existing deck damage—as noted above, the deck must be inspected, and any damage repaired.
For most older homes, the recommendation is to remove existing shingles and start fresh with a properly prepared deck and new underlayment. While this adds to the upfront cost, it ensures the new metal roof has the best possible foundation and maximum longevity.
Cost of Metal Roofing for Older Homes in Ontario
The cost of metal roofing for an older home in Ontario depends on the same factors as any other home—size, complexity, and product choice—with some potential additions:
Base installation cost—same as any GTA home: $6,000–$24,000, depending on roof size and product.
Roof deck repairs—if deck damage is found, repairs typically cost $500–$3,000 depending on the extent of damage.
Shingle tear-off — if multiple layers need removal: $1,500–$3,500.
Ventilation upgrades—if ventilation improvements are needed: $500–$2,000.
The good news is that even with these additional potential costs, metal roofing on an older home is still the most cost-effective long-term roofing solution—eliminating future replacement costs entirely.
Common Questions from Older Home Owners
Will metal roofing be too heavy for my older home? No, metal roofing is actually one of the lightest roofing options available. Its lightweight nature makes it particularly well-suited to older homes.
Will metal roofing look right on my older home? Yes—metal tiles in traditional profiles and colors complement older GTA homes beautifully. Many homeowners find their older home looks significantly better with a properly chosen metal roof than it did with aging asphalt shingles.
Do I need special permits for metal roofing on an older home? Generally no — a straight roofing material replacement typically doesn’t require a permit in most Ontario municipalities. However, always confirm with your local building department, particularly for heritage-designated properties.
How do I find a contractor experienced with older homes? Look for a contractor who has specific experience with older GTA homes—who understands the additional deck inspection and preparation requirements unique to older properties.
Getting a Free Estimate for Your Older Home
At VR Metal Roofing, we have extensive experience installing metal roofing on older GTA homes—from post-war bungalows to century-old brick colonials. We understand the specific requirements of older properties and provide honest, thorough assessments before any installation begins.
We offer free online estimates for most GTA homes — no site visit required in most cases. For older homes where a site visit is beneficial, we can arrange that too.
We proudly serve homeowners across Mississauga, Vaughan, Scarborough, Brampton, Etobicoke, Markham, Richmond Hill, Oakville, Burlington, and Milton.
📞 +1 (647) 262-9203
📞 +1 (647) 862-8085
✉️ info@vrmetalroofing.ca