Thinking of upgrading your roof but dread the hassle of tearing off old shingles? Good news—it’s entirely possible to install a metal roof over shingles. This approach not only saves you time and money but also offers durability, energy efficiency, and a touch of modern style that shingles simply can’t match.
Whether you’re a DIY enthusiast or a roofing contractor, this guide will walk you through the why and the how of installing metal roofing over existing shingles.
Why Install Metal Roofing Over Shingles?
Shingles may be the conventional choice, but they’re far from perfect. Over time, they require frequent replacements, regular maintenance, and can lead to environmental waste since they are rarely recycled. That’s where metal roofing steps in as the superior option.
Benefits of Metal Roofing
- Durability: Metal roofs can last 50+ years, far exceeding the lifespan of traditional shingles (typically 15–20 years).
- Eco-friendly: Made from recycled materials and 100% recyclable at the end of their lifespan, metal roofs are a sustainable choice.
- Cost-effective: Avoid costly shingle tear-offs and save on disposal fees by installing metal over your existing roof.
- Visual appeal: Available in a variety of colors, finishes, and styles, metal roofing adds modern curb appeal.
- Efficiency: Metal roofing reflects solar heat, reducing cooling costs and offering energy efficiency advantages.
By choosing to install metal roofing over shingles, you keep the existing shingles intact, lowering project costs and minimizing waste sent to landfills. It’s truly a win-win.
Metal Roofing Over Shingles Installation Methods
When you’re ready to swap shingles for stylish and sustainable metal panels, you have several options for installation. Below are the most common approaches to guide your decision.
1. Attachment Into Furring or Lathing Strips
This method involves attaching wood purlins or furring strips over the old shingles, creating a framework for the metal roof to sit on.
How It Works
- Install furring strips (or sub-girts) directly over the existing shingles or decking.
- Secure the new metal roof panels to this frame.
Pros:
- Environmentally friendly—shingles stay in place, reducing disposal waste.
- Provides ventilation space, reducing moisture buildup.
Cons:
- This method adds weight to your roof, so it’s important to ensure the structure can support it.
- Costs can be similar to a tear-off due to the price of furring materials and extra labor.
Important Tip: If using pressure-treated lumber for the furring strips, apply a barrier like synthetic underlayment or #30 felt to prevent corrosion between the wood and metal panels.
2. Direct Attachment to Shingles
An economical and straightforward method, this approach involves attaching metal roofing panels directly to the shingles and into the wood deck below.
How It Works
- Place panels over the existing shingles.
- Secure the panels by driving fasteners through both the shingles and underlying wood deck.
Pros:
- Cost-effective with reduced material and labor requirements.
- Quick installation process.
Cons:
- Lacks Above Sheathing Ventilation (ASV), which can reduce energy efficiency.
- Shingle irregularities might show through thinner metal panels—this is purely aesthetic and does not affect performance.
- A barrier layer (felt, synthetic underlayment, or foil-faced insulation) must be added between shingles and metal to prevent shingle wear on the panels over time.
This method is perfect for homeowners aiming for budget-friendly solutions but with slightly lower energy savings potential.
3. Shingle Recover Systems (Preferred Method)
For a premium solution, consider using a specialized shingle recover system such as the 138T Shingle Recover System. This innovative method avoids the need for furring strips while offering superior performance and energy savings.
How It Works
- Install specially designed clips to secure symmetrical metal roof panels.
- This creates a small air gap underneath the panels, allowing for ASV, which optimizes energy efficiency.
Pros:
- Maximizes Above Sheathing Ventilation for energy savings.
- Easy repair and replacement during the roof’s lifespan.
- A sleek and polished final look, free of noticeable shingle irregularities.
Cons:
- Higher upfront cost compared to simpler methods, but provides long-term savings in energy efficiency and maintenance.
With ASV and enhanced airflow, this system is excellent for improving energy consumption, reducing costs, and keeping homes or buildings cooler.
Key Steps to Install Metal Roofing Over Shingles
Step 1. Inspect the Existing Roof
Before beginning, ensure the current shingle roof is level and structurally sound. Repair any visible damage or issues that may compromise the performance of the new metal roof.
Step 2. Add a Protective Barrier
Regardless of the method you choose, always install a protective layer (such as underlayment or insulation) to extend the life of both the metal panels and the shingles below.
Step 3. Select High-Quality Materials
Choose reliable and durable metal roofing panels in styles and finishes that match the building’s aesthetic. Pay close attention to features like UV resistance and corrosion prevention in the metal.
Step 4. Ensure Proper Ventilation
If ventilation is a concern, opt for a method that provides ASV to improve energy efficiency and reduce moisture risks.
Step 5. Install Panels with Precision
Whether you’re attaching to furring strips or directly into the deck, ensure fasteners are properly spaced and all panels are aligned for a seamless, polished finish.
Step 6. Inspect Your Work
Finally, inspect the roof for any loose panels, improper fasteners, or potential weak points to ensure the installation is solid and secure.
Make the Switch to Metal Roofing
Installing a metal roof over shingles offers an efficient, cost-effective, and environmentally friendly upgrade. By choosing the right installation method and materials for your project, you can maximize the benefits of metal roofing without the hassle of a tear-off.
Looking for expert guidance or high-quality materials? We’re here to help! Whether you’re a professional contractor or a DIY homeowner, we offer resources and products tailored to your roofing needs.
Contact us today to learn more, explore our shingle recover systems, or find a contractor in your area. Your perfect roof is closer than you think.