How to Install Metal Roof Over Shingles: A Step-by-Step Guide

How To Install Metal Roof Over Shingles

Are you tired of constantly repairing your old, worn-out shingle roof? Upgrading to a metal roof can increase your home’s value, improve its overall appearance, and provide long-lasting protection against the elements. If you’re considering making the switch, you may be wondering how to install a metal roof over shingles. In this article, we’ll provide a step-by-step guide to help you through the process.


Ensure you have all the necessary tools and materials before starting a metal roof installation project.
Ensure you have all the necessary tools and materials before starting a metal roof installation project.

Before you begin installing your new metal roof, it’s essential to prepare the existing roof properly. The preparation process involves inspecting the roof, gathering the necessary tools and materials, and taking safety precautions.

Inspecting the Existing Roof

Before installing your new metal roof, it’s crucial to inspect your existing roof for any damage or weak areas. Look for missing or cracked shingles, damaged flashing, or signs of water damage. If you notice any issues, address them before proceeding with the installation.

Gathering the Necessary Tools and Materials

To install a metal roof over shingles, you’ll need to gather a few essential tools and materials. These include:

  • Measuring tape
  • Hammer
  • Roofing nails
  • Screw gun
  • Metal roofing panels
  • Underlayment
  • Sealant
  • Flashing

Make sure to purchase high-quality materials to ensure your new roof’s longevity.

Taking Safety Precautions

Installing a new roof can be dangerous, so it’s essential to take safety precautions. Wear appropriate footwear with good traction, and use a safety harness or rope to prevent falls. Additionally, ensure the ladder you use is stable and secure. Don’t install the roof during wet or windy weather, as this can increase the risk of accidents.


Once you’ve prepared the existing roof, it’s time to install your new metal roof over the shingles. Follow these steps to ensure a successful installation:

Applying the Underlayment

The underlayment is a vital component of your new metal roof. It helps protect your home from water damage and provides a smooth surface for the metal panels. Begin by laying the underlayment over the existing shingles, ensuring it’s flush with the roof’s edges. Secure the underlayment to the roof using roofing nails or staples.

Installing the Metal Panels

Before installing the metal panels, measure the length and width of your roof to ensure you have the correct size panels. Begin installing the panels at the bottom of the roof, securing them to the underlayment with roofing screws. As you install each panel, overlap it with the previous one, creating a watertight seal. Continue installing the panels until you reach the top of the roof.

Sealing the Seams and Edges

Once you’ve installed all the metal panels, it’s time to seal the seams and edges. Use sealant to cover any gaps between the panels and around the edges of the roof. This will help prevent water from seeping through and causing damage.

Installing Flashings and Trim

To complete the installation, install flashings and trim around the roof’s edges, chimney, and any other protrusions. Use sealant to secure the flashings and trim to the roof, creating a watertight seal.


To ensure your new metal roof lasts for many years to come, it’s essential to perform regular maintenance. Here are some tasks you can do to keep your roof in excellent condition:

Cleaning the Roof

Dirt, debris, and leaves can accumulate on your roof over time, causing damage and reducing its lifespan. To prevent this, clean your roof at least once a year. Use a soft-bristled brush or pressure washer to remove any debris, being careful not to damage the metal panels.

Checking for Damage

Regularly inspect your roof for any signs of damage, such as dents, cracks, or loose panels. Address any issues as soon as possible to prevent them from worsening.

Painting or Sealing the Roof

Over time, your metal roof may begin to fade or lose its shine. To restore its appearance, consider painting or sealing the roof. This will also help protect it from the elements and extend its lifespan.


When considering installing a metal roof over shingles, one of the primary factors to consider is the cost. Metal roofing is generally more expensive than traditional roofing materials like asphalt shingles. However, the longevity and durability of metal roofing make it a worthwhile investment in the long run.

Additionally, the cost of installation can vary depending on several factors, such as the size of your roof, the type of metal roofing you choose, and the complexity of the installation process. It’s essential to get quotes from several reputable contractors to ensure you’re getting a fair price for your new roof.


Installing a metal roof over shingles can provide numerous benefits, including increased durability, energy efficiency, and aesthetic appeal. Proper preparation, installation, and maintenance are essential to ensure the longevity and effectiveness of your new roof.

In summary, inspect your existing roof and gather the necessary tools and materials before proceeding with the installation process. Take appropriate safety precautions to prevent accidents. While metal roofing may be more expensive than traditional roofing materials, the durability and longevity of metal roofing make it a worthwhile investment. Consider getting quotes from multiple contractors to ensure you’re getting a fair price.

In conclusion, upgrading to a metal roof can provide long-lasting protection and aesthetic appeal for your home. With proper installation and maintenance, your new roof can provide years of worry-free use.