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Choosing to install a metal roof is a wise investment in the durability and longevity of your home’s roofing system. During the process of investing in a metal roof, a few questions are likely to arise.

For example: should you install a metal roof over existing shingles, or is it better to use a metal roof underlayment for extra protection? Can you install a metal roof directly on top of shingles? Do you need to remove asphalt shingles before installing a metal roof?

The significance of a metal roof underlayment

The underlayment for a metal roof serves as a layer of protection between the metal roofing material and the existing roof deck. Understanding its importance is key to ensuring a durable, long-lasting roofing system.

Moisture protection

A metal roof underlayment acts as a moisture barrier, preventing water from infiltrating the roof’s structure. If you live in an area that’s prone to heavy rainfall or snow, installing an underlayment is particularly advisable, since it will protect your roof from moisture damage over time.


An underlayment provides an additional layer of insulation, contributing to the overall energy efficiency of your home. It helps to regulate temperature and reduces the transfer of heat, which keeps the home cooler in the summer and warmer in the winter.


Underlayment adds an extra layer of protection to the roof deck, which makes the whole roofing system even more durable. It guards against potential damage from environmental factors like wind-driven rain or ice dams.

Installing a metal roof over shingles

Installing a metal roof over shingles is a viable option that can save valuable time and labor. If you choose to go this route, there’s a few steps you should follow.

Inspection and preparation

Inspect the existing shingles for damage. Make sure that the roof deck is in good condition, and repair any issues before proceeding. Clean the roof surface to remove any buildup of debris.

Metal roof underlayment installation

We don’t recommend installing a metal roof directly on top of asphalt shingles, but there’s no need to remove the asphalt shingles to successfully install an effective metal roof. Adding an underlayment between the shingles and the metal roof will add extra protection against moisture infiltration, potentially saving you a lot of time, stress, and money in the future.

Your metal roof installers will roll out and install the underlayment according to manufacturer guidelines, securing it to the roof deck.

Installing metal roof panels

After the underlayment is in place, it’ll be time to install the metal roof panels. Installers will follow manufacturer guidelines and use appropriate fasteners to firmly secure the panels to the roof deck.

Flashing and trim installation

Installation of flashing around roof penetrations and edges puts the finishing touches on the roof’s watertight seal. Trim elements are also useful for adding protection and aesthetic appeal to the roof.

Challenges and benefits

Installing a metal roof over shingles has benefits: it costs less and allows for faster installation. However, it may also cause some challenges, like uneven surfaces or difficulties with the added weight of the new roof. A roofing professional will examine your roof and help you to arrive at the most cost-effective and efficient solution.

Concerns about metal roof installation over shingles

When it’s done correctly, installing a metal roof over shingles is a feasible, safe, and effective option. You should always make sure that installers are following industry best practices, adhering to local building codes, and consulting with professionals to ensure structural integrity and safety.

While it’s theoretically possible for your shingle roof to have difficulty supporting the weight of a new metal roof, it’s unlikely. Metal roofs are quite lightweight, and residential structures are well-equipped to handle the additional weight of an added metal roof. However, a structural engineer will be able to assess your unique roofing situation and help you determine a course of action from there.

Proper installation of your metal roof

When installing a metal roof over shingles, be sure to prioritize proper installation and adhere to industry standards. A metal roof underlayment adds protection, and installing a metal roof over shingles offers efficiency and cost savings.

Always consult with roofing professionals before embarking on a major project with your roof. If you have questions or would like to get started on installing your own metal roof, give the experts here at Metal Roof Pros a call today.