How To Install Metal Roofing Over Asphalt Shingles: A Step-By-Step Guide for Homeowners

When it comes to upgrading your roof, metal roofing over asphalt shingles is an increasingly popular option. Many homeowners ask, How to install metal roofing over asphalt shingles? due to the efficiency, durability, and long-term cost savings metal roofing offers. By overlaying metal roofing on asphalt shingles, you can avoid the time and cost of shingle removal, speed up installation, and enjoy the added benefits of a metal roof.

How To Install Metal Roofing Over Asphalt Shingles

This article will provide a detailed step-by-step guide on how to install metal roofing over asphalt shingles, discuss the benefits of this type of installation, and address key considerations for a successful project.


Why Install Metal Roofing Over Asphalt Shingles?

Before diving into the installation process, it’s important to understand the benefits of overlaying a metal roof on asphalt shingles. Here are a few reasons this method is often preferred:

1. Cost Savings

Installing metal roofing directly over asphalt shingles eliminates the need for costly shingle removal and disposal. This not only saves on labor but also reduces the overall time and expense of the project.

Read too: Hail Damage Roof Repair: Essential Guide to Restoring Your Home’s Protection

2. Durability and Longevity

Metal roofs are highly durable and can withstand extreme weather conditions. They often last 40 to 70 years, far surpassing the lifespan of traditional asphalt shingles.

3. Enhanced Energy Efficiency

Metal roofs reflect sunlight, which can reduce heat absorption and lower cooling costs during hot seasons. This energy efficiency feature makes them an attractive option for eco-conscious homeowners.

4. Environmentally Friendly Option

By leaving the asphalt shingles in place, you reduce waste sent to landfills. Additionally, metal roofing is often made from recycled materials, and it’s 100% recyclable at the end of its life.


Important Considerations Before Installing Metal Roofing Over Asphalt Shingles

1. Local Building Codes

Always check local building codes before beginning any roofing project. Some regions limit the number of layers you can have on a roof, and metal roofing may have specific code requirements.

2. Roof Structural Integrity

Metal roofing is lightweight, but adding it on top of asphalt shingles can increase the overall load on your home’s structure. Have a professional inspect your roof to ensure it can handle the extra weight.

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3. Addressing Existing Roof Issues

Any underlying issues, such as leaks or damaged shingles, should be fixed before installing the metal roof. Failure to address these problems can lead to moisture buildup and mold.

4. Ventilation and Moisture Concerns

Proper ventilation is essential to prevent condensation buildup between the metal and shingle layers. Consider adding ventilation or furring strips to enhance airflow under the metal panels.


How To Install Metal Roofing Over Asphalt Shingles: Step-by-Step Guide

Step 1: Gather the Necessary Tools and Materials

To begin, you’ll need the following materials and tools:

  • Metal roofing panels
  • Underlayment or vapor barrier
  • Furring strips (optional but recommended)
  • Roofing screws and nails
  • Roofing sealant
  • Measuring tape, chalk line, and level
  • Safety gear: gloves, eye protection, and a stable ladder

Step 2: Inspect and Prepare the Roof Surface

Before installing the metal roof, inspect the existing asphalt shingles for any signs of damage. Remove any loose or damaged shingles, as they could compromise the integrity of the metal roof.

After inspection, clean the roof of any debris and dust to ensure the metal roofing adheres well.

Step 3: Install a Vapor Barrier or Underlayment

Adding a layer of underlayment or a vapor barrier between the asphalt shingles and the metal roofing is essential. This layer will act as additional protection against moisture, prevent mold growth, and provide extra insulation.

Roll out the underlayment across the roof and secure it in place using nails or staples, overlapping each layer to ensure full coverage.

Step 4: Install Furring Strips for Ventilation (Optional but Recommended)

Furring strips, also known as battens, are thin strips of wood that create a small gap between the shingles and the metal roofing. This gap promotes ventilation, reducing moisture buildup and adding insulation.

Attach furring strips vertically along the roof, securing them every 16 inches. Make sure they’re level and evenly spaced for a smooth installation.

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Step 5: Measure and Cut Metal Panels

Measure the roof carefully to determine the size and number of metal panels needed. Use a chalk line to create straight cutting lines on the metal panels, then cut them to size using metal shears or a saw. Be sure to leave some overhang at the edges for added weather protection.

Step 6: Secure Metal Panels to the Roof

Start installing the metal panels at the bottom edge of the roof, working your way up. Overlap each panel slightly to create a waterproof seal and fasten each panel using roofing screws. Secure the screws at intervals of 12 to 16 inches along the panel, making sure they’re tightly fastened to prevent water penetration.

When installing each panel, check that it is straight and level to avoid issues with alignment later on.

Step 7: Apply Ridge Caps and Trim

After the panels are installed, apply ridge caps along the roof’s peak. Ridge caps cover the seams where the two sides of the roof meet and prevent water infiltration. Similarly, install edge trim along the sides and eaves for a clean, finished look.

Use sealant on the screws and other potential entry points for added waterproofing. Make sure the sealant is weatherproof to withstand various conditions.

Step 8: Inspect and Ensure Proper Ventilation

Proper ventilation is crucial for preventing moisture buildup under the metal roof. Double-check the ventilation setup, especially if you added furring strips, to ensure adequate airflow. Proper ventilation will extend the lifespan of both the metal roof and the asphalt shingles underneath.


Benefits of Metal Roofing Over Asphalt Shingles

Once installed, metal roofing offers numerous long-term benefits:

  1. Increased Energy Efficiency: Metal roofs reflect heat and can reduce cooling costs by up to 25%, making them ideal for hot climates.
  2. Long-Term Cost Savings: Although metal roofing may have a higher initial cost, its durability, minimal maintenance requirements, and energy savings often make it a more cost-effective choice over time.
  3. Weather Resistance: Metal roofs are highly resistant to weather damage, including heavy rain, wind, and even fire. This level of durability is an advantage over asphalt shingles, which may need frequent repairs or replacement after severe weather events.
  4. Aesthetically Versatile: Metal roofing is available in a range of colors, finishes, and styles, allowing homeowners to customize their roof’s appearance while adding value to their property.
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Frequently Asked Questions

Can you install a metal roof over two layers of shingles?

In general, adding a metal roof over two layers of shingles may exceed the roof’s weight limits and could violate local building codes. Always check local regulations and consult a roofing professional before proceeding.

Is it noisy to have metal roofing over shingles?

While metal roofs can produce more noise than asphalt shingles during heavy rain or hail, adding an underlayment or furring strips can help reduce noise. Modern metal roofing panels are also often designed to minimize noise.

Does installing a metal roof increase home value?

Yes, a well-installed metal roof can enhance curb appeal and increase property value due to its durability, energy efficiency, and long lifespan.

Will a metal roof rust over asphalt shingles?

Most modern metal roofing materials are coated to resist rust, but maintaining the integrity of the underlayment and ventilation is key to preventing moisture issues that could lead to rusting over time.


Final Thoughts on Installing Metal Roofing Over Asphalt Shingles

Choosing to install metal roofing over asphalt shingles is a practical solution for homeowners looking for durability, energy savings, and environmental benefits. By following the correct steps and addressing key considerations such as ventilation and weight, you can ensure a smooth and successful installation process.

While this method offers significant advantages, it’s essential to verify local building codes and consult with a professional if you’re unsure about your roof’s structural integrity. When done properly, metal roofing over asphalt shingles can provide years of reliable protection, reduce maintenance needs, and even increase your home’s resale value.

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