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How to Install a Metal Roof Over Existing Asphalt Shingles: Some Tips By James Kenton

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If you’re a homeowner thinking about improving your roof, you might be considering switching from regular shingles to metal roofing. What some homeowners don’t realize is that you can actually put metal roofing on top of your existing shingles. This is a practical and eco-friendly option that adds extra protection to your home and strengthens the roof’s structure. Plus, it saves you money since you don’t have to remove the old roof. It’s a win-win situation!

In this blog post, James Kenton shares the steps to install a metal roof over existing asphalt shingles.

Step 1: Assess Your Roof’s Condition

Before starting to install a metal roof over asphalt shingles, you need to thoroughly evaluate the roof’s current state. If the existing shingles are significantly damaged, curled, or missing, it is advisable to remove them entirely. On the other hand, if the shingles are in good condition, you can proceed with the installation.

Step 2: Prepare the Roof Surface

Once you have assessed the existing roof’s condition, the next crucial step is preparing the surface for the forthcoming metal roofing. Start by cleaning the roof, ensuring the removal of any debris, such as leaves and branches.

Additionally, attend to any loose or damaged shingles by securing or replacing them. Finally, meticulously inspect the roof for any protrusions or irregularities that could impede the installation of the metal roof.

Step 3: Install Furring Strips

To ensure a uniform and sturdy surface for the metal roofing, it is recommended to install furring strips over the existing shingles. Typically crafted from wood, roofing professionals install these strips horizontally across the roof. The primary purpose of these strips is to provide a solid foundation for the metal roofing while helping to prevent moisture buildup between the metal and asphalt layers.

A grey car parked outside a house.

Step 4: Mount the Metal Roofing

Once the furring strips are securely in place, your roofing professionals can start installing the metal roofing. They’ll start this process from the eave and progress upward toward the ridge. To affix the panels, they’ll utilize screws along with neoprene washers, ensuring a tight but not overly tightened grip that might damage the metal. It’s important to ensure that the panels align correctly.

Step 5: Finish Edges and Seams

To guarantee a watertight seal, it is vital to meticulously finish the edges and seams of the metal roofing. This involves installing the appropriate flashing and sealant. Along the eaves and rakes, introduce drip edges. At the roof’s peak, you need to secure ridge caps.

For areas with protrusions, such as chimneys or vents, roofing professionals apply flashing and seal it using high-quality silicone sealant. This comprehensive approach ensures both aesthetics and functionality.

Step 6: Inspect and Maintain the Roof

Following the successful installation of your metal roofing, it is essential to adopt a proactive approach to inspection and maintenance. Regularly examine the roof for any signs of damage or corrosion. Implement a cleaning regimen to remove debris and prevent algae growth. Lastly, verify the integrity and effectiveness of the flashing and sealant.

Diligent maintenance extends the lifespan of your metal roof and safeguards against potential costly repairs down the road.

Cars parked outside a house

Frequently Asked Questions About Installing Metal Roofing Over Shingles

Are you considering installing metal roofing over your existing shingles? If so, you likely have some questions about the process. Let’s address some of the most common inquiries to help you make an informed decision.

1. Do I Need Underlayment When Installing Over Shingles?

Every roofing system requires an underlayment, but when it comes to installing a metal roof over existing shingles, there are some considerations. In many cases, the shingles themselves can act as a sort of underlayment.

However, it’s important to note that as shingles age and deteriorate, their effectiveness as an underlayment diminishes. Therefore, it’s advisable to eventually replace them with a proper underlayment for optimal protection. If you prefer to leave the shingles in place during the initial installation, it’s still essential to install a new underlayment over the old asphalt shingles to ensure the integrity of your metal roof.

2. Is There a Limit to How Many Layers of Shingles You Can Install a Metal Roof Over?

Local building codes often dictate the number of shingle layers you can install a metal roof over. Typically, building departments allow the installation of a metal roof over one or two layers of existing shingles.

Nevertheless, if your roof has more than two layers of shingles, it is often required that you remove the shingles before installing the new metal roof. This regulation is in place to ensure the structural integrity and safety of your roofing system.

3. What Are the Benefits of Installing Metal Roofing Over Asphalt Shingles?

Some of the key benefits of installing metal roofing over asphalt shingles include:

  1. Exceptional Durability:Metal roofing can withstand extreme weather conditions, including heavy rain, hail, and high winds. In addition, its resistance to fire and pests makes it a reliable, long-term investment in safeguarding your home.
  2. Enhanced Energy Efficiency:Metal roofing contributes to energy savingsby reflecting heat, which helps maintain a cooler interior during hot summer months.
  3. Extended Lifespan:Metal roofing boasts an impressive lifespanof up to 50 years or more, significantly surpassing the typical 20-year lifespan of traditional asphalt shingles.
  4. Elevated Aesthetics: Metal roofing offers a wide range of colors and styles to choose from, allowing you to enhance the overall appearance of your building. Not only does it contribute to improved aesthetics, but it can also boost property value and curb appeal, making your home or property stand out.

Exterior of a house with a metal roof

If you are considering the installation of a metal roof and require expert guidance or professional assistance, do not hesitate to reach out to James Kenton. With his extensive knowledge and three decades of experience in the roofing industry, he can provide you with the expertise and support needed to ensure your metal roof installation is a resounding success. Contact James Kenton Tennessee today!

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