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

Table of Contents

Are you tired of dealing with leaky shingles on your roof? Maybe it’s time to consider installing a metal roof over your existing shingles. Not only can a metal roof provide better protection against weather elements, but it can also offer a more modern and sleek look for your home.

In this step-by-step guide, we’ll walk you through the process of installing a metal roof over shingles. From preparing the roof to finishing touches, we’ll cover everything you need to know to get the job done right.

Materials Needed

A close-up of the roofing underlayment and metal panels for a metal roof installation

Before you begin the installation process, you’ll need to gather all the necessary materials. Here’s a list of the tools and supplies you’ll need:

Metal panels: Choose a metal roofing system that best fits your needs and preferences.
Roofing underlayment: This layer of protection will help prevent moisture from damaging the metal panels and add an extra layer of insulation.
Roofing screws: Stainless steel screws with neoprene washers are recommended for metal roofing.
Sealant: Use a high-quality caulk or sealant to seal around screws, edges, and other openings to prevent leaks.
Flashing: These metal strips are installed around the edges of the roof to prevent water from seeping in under the metal panels.
Ridge caps: These are installed along the peak of the roof to provide a finished look and prevent water from entering at the top of the roof.
Trim: Use metal trim pieces to cover the edges of the roof and provide a finished appearance.
Safety equipment: Make sure you have a sturdy ladder, safety harness, and other necessary safety equipment to protect yourself during the installation process.

Once you have all the necessary materials, it’s time to prepare the roof for installation.

Preparing the Roof

Before installing a metal roof over shingles, it’s crucial to inspect the roof for any damage. Look for any missing or broken shingles, leaks, or other issues that need to be addressed. Repair any damage before moving forward with the installation process.

Next, clean the roof surface to remove any dirt, debris, or loose shingles. You can use a pressure washer or a garden hose to clean the roof, but be careful not to use too much pressure, as it can damage the shingles or the roof structure. Allow the roof to dry completely before moving on to the next step.

Finally, apply a roofing underlayment to the roof surface. This will provide an extra layer of protection against moisture and help prevent condensation from building up between the metal panels and shingles. The underlayment should be laid horizontally, starting from the bottom of the roof and working your way up. Overlap each row by at least 6 inches to ensure full coverage.

By properly preparing the roof, you’ll ensure that your metal roof installation will be successful and long-lasting. In the next section, we’ll walk you through the process of installing the metal panels.

Installing the Metal Roof

With the roof properly prepared, it’s time to install the metal panels. Here’s how to do it:

Measure and cut the metal panels to fit the roof: Measure the length and width of the roof to determine how many metal panels you’ll need. Cut the panels to the right size using metal snips or a circular saw with a metal-cutting blade.
Install the panels starting from the bottom up: Starting at the bottom edge of the roof, lay the first metal panel horizontally. Make sure it’s aligned with the edge of the roof and overhangs the eaves by at least an inch. Use roofing screws to attach the panel to the roof, placing screws in every other rib. Repeat this process for each subsequent panel, overlapping each one by at least an inch.
Secure the panels with screws and sealant: Once the panels are in place, secure them with roofing screws. Make sure to use screws with neoprene washers to prevent leaks. Screw the panels down along the ridges, spacing them out about 12 inches apart. After each screw is in, apply a high-quality sealant around it to prevent water from seeping in.
Continue installing the panels until you reach the top of the roof: Work your way up the roof, installing each panel in the same way. When you get to the peak of the roof, install the ridge caps to cover the top edge of the panels. Ridge caps are designed to provide a finished look and prevent water from entering at the top of the roof.

By following these steps, you’ll have a new metal roof installed over your existing shingles in no time. In the next section, we’ll cover the finishing touches to complete the installation process.

Finishing Touches

To complete the installation process, you’ll need to add some finishing touches. Here’s what you need to do:

Install flashing around the edges of the roof: Flashing is installed around the edges of the roof to prevent water from seeping in under the metal panels. Install the flashing along the eaves and gables, overlapping each piece by at least an inch.
Install ridge caps to cover the peak of the roof: Ridge caps are installed along the peak of the roof to provide a finished look and prevent water from entering at the top of the roof. Use metal snips or a circular saw to cut the ridge caps to the appropriate size, then secure them to the roof with roofing screws.
Add trim and gutters to complete the installation process: To give your new metal roof a finished appearance, add metal trim pieces to cover the edges of the roof. You should also install gutters to prevent water from pooling on the roof and causing damage.

By completing these steps, you’ll have a beautiful and long-lasting metal roof that will protect your home for years to come. In the next section, we’ll discuss some tips for maintaining your new metal roof.

Finishing Touches

With the metal panels securely installed, it’s time to add the finishing touches to your new roof. Here are the final steps to complete the installation process:

Install flashing around the edges of the roof: Use metal flashing strips to cover the edges of the roof and prevent water from seeping in under the metal panels. Be sure to overlap each piece of flashing by at least 6 inches and seal it with a high-quality sealant.
Install ridge caps to cover the peak of the roof: Ridge caps are metal pieces that cover the top of the roof and provide a finished appearance. They also prevent water from entering at the top of the roof. Install the ridge caps using roofing screws and sealant.
Add trim and gutters to complete the installation process: Use metal trim pieces to cover the edges of the roof and provide a finished appearance. Install gutters and downspouts to direct water away from the foundation of your home.

By completing these final steps, you’ll have a fully functional and stylish metal roof that will provide protection and durability for years to come.

Conclusion

Installing a metal roof over shingles can be a great investment for your home. Not only does it provide better protection against weather elements, but it can also add value to your property. Here are some tips and final thoughts to keep in mind:

Tips for maintaining a metal roof: Regularly inspect your roof for any damage or issues. Keep it clean and clear of debris. Trim any overhanging tree branches that may cause damage to your roof.
Importance of hiring a professional for the installation process: While it is possible to install a metal roof over shingles on your own, it’s a complex process that requires experience and expertise. Hiring a professional will ensure that the job is done correctly and safely.
Final thoughts on the benefits of a metal roof over shingles: A metal roof can provide better protection against weather elements, lower energy costs, and increase the value of your home. It’s a durable and long-lasting roofing option that can offer a modern and stylish look for your property.

By following this step-by-step guide, you can install a metal roof over shingles and enjoy the many benefits that come with it.