If you’re thinking about upgrading to a metal roof, you might be wondering: Can it go right over my existing shingles? The short answer is yes, sometimes. In many cases, installing a metal roof over asphalt shingles is not only possible but also practical. Still, there are a few important considerations to keep in mind before making your decision.
At Aces Roofing, we help homeowners and business owners throughout the Comox Valley make informed choices about roofing upgrades. Here’s what you need to know.
The Benefits of Installing Metal Over Shingles
1. Cost and Time Savings
By skipping a full tear-off, you reduce labour costs and cut down on disposal fees. That means your metal roof installation is faster and often more affordable.
2. Added Insulation and Sound Dampening
The layer of shingles under your metal roof can offer extra insulation and even reduce rain noise—especially when combined with a solid underlayment.
3. Less Waste to the Landfill
Keeping your old shingles in place means less roofing material ends up in local landfills. It’s a greener option that appeals to eco-conscious homeowners.
When It’s a Good Fit
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The existing shingles must be in reasonably good condition (not curled, cracked, or rotting).
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The structure of your roof must be sound and capable of supporting the added weight.
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Your local building code must allow it—most areas in the Comox Valley do, but it’s always best to check.
At Aces Roofing, we always inspect your roof deck and shingle condition before recommending an overlay. We’ll never install metal over hidden damage.
Potential Drawbacks
1. Trapped Moisture
If moisture gets between the shingles and the metal panels, it can lead to mold, rot, or rust. This is why using a proper underlayment and ensuring good ventilation is key.
2. Less Visibility of Structural Issues
If you install over existing shingles, problems with the decking or underlayers might go unnoticed. That’s why a thorough inspection is critical before beginning any overlay job.
3. Can’t Do It More Than Once
If you already have multiple layers of roofing material, building code typically requires a complete tear-off before installing anything new.
What We Recommend
Every roof is different. At Aces Roofing, we assess each project individually. If your existing shingles are in good shape and local regulations allow it, a metal-over-shingle installation can be a great solution. But if there’s underlying damage—or you’re aiming for maximum performance and warranty coverage—a full tear-off might be the smarter route.
Thinking About Upgrading to Metal Roofing? Let’s Talk.
Whether you’re planning a full replacement or wondering if an overlay is an option, Aces Roofing is here to help. We bring years of experience, honest advice, and high-quality workmanship to every job across the Comox Valley.
Contact us today to book your free inspection and quote. Let’s find the roofing solution that’s right for you.
