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Can You Install Metal Roof Over Shingles

Can You Install Metal Roof Over Shingles

You’re considering installing a metal roof over your existing shingles, and you might be wondering if it’s a practical solution. Under the right conditions, this approach can offer significant benefits, including cost-efficiency and reduced installation time. However, before you decide, it’s vital to assess the current state of your shingles and the overall structure to make sure there are no underlying issues that could affect the performance of your new roof. Curious about what specific conditions make this option suitable, or perhaps when it might be a misstep? Let’s explore the essential factors that determine whether this roofing method is right for your home.

Essential Checks Before You Put a Metal Roof Over Shingles

Before installing a metal roof over shingles, you must check the condition of your existing roof to make sure it can support the new overlay. Start by evaluating the shingles themselves. They shouldn’t be curled, buckled, or missing. If you find widespread damage or deterioration, you’ll need to address these issues first. It’s not just about the shingles, though. You’ve got to examine the entire structure.

Look at the decking and rafters from inside your attic. Are there signs of water damage or rot? Sagging or structural weakness could be a dealbreaker. You’ll also want to make sure there’s no mold or mildew, as these can indicate moisture issues that might compromise the integrity of the new roof.

Next, consider the ventilation system. Proper attic ventilation is important to prevent overheating and moisture buildup under your new metal roof. Check that your existing vents are clear and functioning well.

Lastly, review local building codes. Some areas might restrict multiple layers of roofing or require specific underlayment for metal roofs. You don’t want to get halfway through your project only to realize you’re not in compliance with local regulations. Getting these checks done first saves you time and money in the long run.

Installing Metal Roofing Above Shingles

Now that you’ve confirmed your existing roof is in good shape, let’s start the process of installing your new metal roof over the shingles. First, you’ll need to install a layer of roofing underlayment over the existing shingles. This acts as an extra barrier against moisture and guarantees a smoother surface for the metal panels.

Next, it’s time to begin laying the metal panels. Start at the lowest point of the roof and work your way up. You’ll overlap each panel by at least one ridge, depending on the type of metal roofing you’ve chosen. Secure the panels in place using screws specifically designed for metal roofing, making sure they penetrate into the roof’s structural supports.

Make sure to install flashing around any roof penetrations like vents, chimneys, and skylights. This will help prevent water from seeping into the gaps. Also, don’t forget the edges of your roof; install drip edges to guide water off efficiently.

Lastly, double-check all screws and seams to make sure everything is tight and properly aligned. This step is essential to avoid potential leaks or damage in the future. With careful attention to detail, you’ll have a new, durable metal roof in place over your old shingles.

Advantages of Metal Roofing

When you opt for a metal roof, you’re investing in durability. Not only will your roof last longer, but it’ll also help you save on energy bills due to its efficiency.

Plus, you’ll find it requires much less maintenance compared to traditional shingles.


One of the major advantages of installing a metal roof over shingles is its impressive longevity, often lasting 40 to 70 years with minimal maintenance. This durability means you’re not likely to replace your roof as often as you’d with other materials.

Metal roofs withstand severe weather conditions better than most roofing types. They resist high winds, won’t corrode or crack, and can handle heavy snow loads efficiently. This resilience translates to fewer worries about repairs and replacements over the years.

Additionally, the robust nature of metal roofing materials helps preserve the structural integrity of your home. Investing in a metal roof can be a smart, long-term decision that saves you money and hassle in the future.

Energy Efficiency

Aside from its durability, a metal roof greatly enhances your home’s energy efficiency by reflecting solar radiant heat, which can reduce cooling costs by 10-25%. This means you’ll spend less on air conditioning, especially during those hot summer months.

The secret lies in the roof’s ability to reflect the sun’s rays rather than absorbing them like traditional shingles. This reflective property helps maintain a more consistent indoor temperature, reducing the strain on your HVAC system. Plus, many metal roofs come with special energy-efficient coatings that further boost this effect.

Low Maintenance

A metal roof requires much less upkeep than traditional roofing materials, saving you both time and money on maintenance. Unlike asphalt shingles that may need frequent replacing due to wear and tear, a metal roof’s durability means you’re not constantly spending on repairs.

You won’t have to worry about shingles blowing off during a storm or algae and moss growth, which are common issues with other roofing types. This resistance to elements eliminates the need for seasonal inspections that other materials often require.

Additionally, most metal roofing materials come with long warranties, giving you peace of mind about your investment. So, if you’re looking for a hassle-free roofing solution, metal is certainly the way to go.

Instances Where Roofing Over Shingles Is Not Advisable

Installing metal roofing directly over old shingles isn’t always the best choice, particularly if your existing roof is in poor condition. If you’ve got multiple layers of shingles, the added weight can be a concern. It’s not just about piling on more; it’s about what your home’s structure can safely support. Overloading your roof can lead to structural damage that’s expensive to fix.

If your old shingles are curled or badly worn, they won’t provide a smooth, stable base for a new metal roof. That uneven surface can lead to improper metal roof installation, which might cause more problems down the line, such as water pooling or uneven wear. You’ve got to take into account what’s lurking underneath too. Rotten decking or unseen damage can compromise the integrity of your new roof. It’s like building your house on a shaky foundation.

Also, be mindful of your local building codes. Some codes don’t allow new roofing layers over old ones. You don’t want to finish an installation only to find out you’re not in compliance. It’s not just a hassle; you could be fined, and you might’ve to redo the work, costing you time and money.

Contact Heins Contracting for Expert Metal Roofing Services

For expert metal roofing services, consider reaching out to Heins Contracting. With years of experience under their belt, they’re equipped to handle your roofing project with precision and care. Whether you’re considering installing a metal roof over existing shingles or starting from scratch, Heins Contracting can provide you with guidance and top-quality workmanship.

When you choose Heins Contracting, you’re not just getting a roofing contractor; you’re partnering with a team of skilled professionals dedicated to ensuring your satisfaction. They’ll walk you through every step of the process, from an initial assessment and discussing your options to the final installation. They understand the importance of a sturdy, well-installed roof and they’re committed to delivering results that not only meet but exceed your expectations.

Don’t hesitate to ask them any questions you might’ve about the process. They’re there to help clarify any doubts and provide you with the peace of mind that comes from knowing your home is in good hands. If you’re ready to take the next step in your home improvement project, give Heins Contracting a call today. They’re ready to transform your home with a new, durable metal roof.


Before you install a metal roof over your existing shingles, always make sure to check the shingle condition, moisture levels, and local codes.

Metal roofing offers durability and energy savings, but it’s not suitable for all situations. If your current roof is in poor shape or overly layered, reconsider this method.

For expert advice and high-quality installation, don’t hesitate to contact Heins Contracting. We’ll guarantee your roofing is done right, providing lasting benefits for your home.

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