Introduction
When homeowners start researching metal roofing, one of the most common questions they ask is whether a new metal roof can be installed directly over existing asphalt shingles. Many homes across Ontario already have one or even two layers of shingles, and removing them entirely can add extra labor, time, and landfill waste. Because of this, many homeowners want to know if upgrading to a steel roof can be done without a full tear-off. In this blog, we will explain how installing a metal roof over shingles works, when it is possible, and why this method can actually save homeowners money while reducing environmental waste. We will also explain how modern metal roofing systems such as the Armadura metal roofing installed by Roof Pros Plus are designed to be installed directly to the roof deck without heavy strapping, making the system stronger, lighter, and more efficient than many traditional metal roofing methods.
Why Installing a Metal Roof Over Shingles Saves Homeowners Money
One of the biggest benefits of installing a steel roof over existing shingles is the potential cost savings. A full roof tear-off requires additional labor, disposal fees, and transportation costs to haul old shingles to landfills. By installing a metal roofing system over the existing shingles when the structure allows it, homeowners can avoid many of these additional expenses.
This approach also reduces the amount of construction waste sent to landfills. Every year, millions of tons of asphalt shingles are removed from homes and dumped into landfills across North America. By installing a metal roof over shingles, homeowners can help reduce this environmental impact while upgrading to a roofing system that will last significantly longer.
Because metal roofing can last 40 to 70 years or more, many homeowners find that this upgrade eliminates the cycle of repeatedly replacing asphalt shingles every decade or so. When viewed as a long-term investment, switching to metal roofing can dramatically reduce lifetime roofing costs.
The Weight Difference Between Asphalt and Metal Roofing
Another concern homeowners often have is whether installing a metal roof over shingles will make the roof too heavy. In reality, metal roofing is one of the lightest roofing materials available. Steel roofing panels weigh significantly less than traditional asphalt shingles, which means that even when installed over an existing layer of shingles, the overall weight on the home is usually very manageable.
However, not all metal roofing systems are designed the same way. Some metal roofs require wooden strapping or battens to be installed across the roof deck before the metal panels are attached. This method adds additional lumber, fasteners, and framing materials, increasing the overall weight of the roof structure.
At Roof Pros Plus, we install advanced Armadura metal roofing systems that are designed to be installed directly to the roof deck. Because the panels attach straight to the deck without heavy strapping, this eliminates the extra weight and complexity that other metal roofing systems often require. The result is a roofing system that is stronger, more stable, and lighter overall.
Why Metal Roofing Stays Lighter Than Asphalt Over Time
Another important factor many homeowners do not realize is how roofing materials behave when exposed to moisture over time. Asphalt shingles absorb water, especially as they age and begin to crack or deteriorate. This trapped moisture can increase the overall weight of the roof and contribute to premature deterioration of the roofing system.
Metal roofing behaves very differently. Steel roofs repel water rather than absorbing it, allowing rain and snow to shed quickly off the surface. This not only helps keep the roofing system lighter but also reduces the risk of moisture buildup, mold growth, and structural stress over time.
Because metal roofing sheds snow more easily than shingles, it can also reduce snow loads during Ontario’s long winters. This makes steel roofing an excellent choice for homes in areas that experience heavy snowfall and freezing temperatures.
The Roof Pros Plus Installation Process
When installing a metal roof over shingles, preparation is extremely important to ensure the new roofing system performs properly for decades. At Roof Pros Plus, we follow a careful process designed to create a stable foundation for the new metal roofing system.
First, our team inspects the existing roof. If any damaged areas are found, we replace the necessary plywood to ensure the deck is strong and secure. Next, we clean and prepare the existing shingle surface. This includes removing loose debris, wire brushing curled or lifted shingles, and flattening any areas that could interfere with the new installation. Proper preparation ensures that the metal panels sit evenly and securely across the roof. Once the surface is properly prepared, we install a high-quality underlayment that provides additional moisture protection and insulation. After this protective layer is installed, the Armadura metal roofing panels are installed directly over the prepared roof structure. Because our system does not require heavy strapping and uses high-quality Canadian-made steel manufactured right here in Ontario, the result is a clean, strong, and highly durable roofing system designed to perform in the demanding Canadian climate.
A 50-Year Non-Prorated Warranty Homeowners Can Trust
One of the biggest advantages of installing an Armadura metal roof through Roof Pros Plus is the exceptional warranty offered by the manufacturer. Our metal roofing system comes with a 50-year non-prorated warranty, even when installed over up to two existing layers of asphalt shingles when the structure allows.
A non-prorated warranty means the protection does not lose value over time, giving homeowners peace of mind that their roof is built to last. This level of warranty coverage reflects the durability and quality of the materials used in modern steel roofing systems.
When compared to asphalt shingles, which often fail long before their advertised lifespan, this long-term warranty highlights the true value of investing in a high-quality metal roofing system.
Conclusion
Installing a metal roof over shingles can be a smart and practical solution for many Ontario homeowners. This method can reduce installation costs, prevent unnecessary landfill waste, and provide a durable roofing upgrade that lasts decades longer than traditional asphalt shingles. When modern systems like Armadura metal roofing are installed directly to the roof deck, homeowners also benefit from a lighter, stronger, and more efficient roofing system without the extra weight of strapping.
At Roof Pros Plus, we combine advanced metal roofing technology with Canadian steel manufactured right here in Ontario, ensuring every roof is built to handle the harsh Canadian climate. Our careful preparation process, direct-to-deck installation, and industry-leading 50-year non-prorated warranty give homeowners the confidence that their investment will provide lasting protection and value.
If you are considering upgrading from asphalt shingles to a metal roof in Ontario, the team at Roof Pros Plus is ready to help. Contact us today to learn more about our affordable, Canadian-made metal roofing systems and discover how you can protect your home with a roof built to last for generations.
