Can You Put a Metal Roof Over Shingles? The Pros and Cons

Choosing the right materials, removing old shingles, and installing a new roof are some of the options homeowners have when replacing their old roofs. An option that’s becoming more popular is installing a metal roof over shingles.

It can save time, money, and effort, but it’s crucial to determine if it’s feasible and suitable for your specific circumstances. This article will delve into the question, “Is it possible to put a metal roof over shingles?” and examine the problems of metal roof over shingles (pros and cons of this roofing method).

Can You Put a Metal Roof Over the Shingles?

Installing a metal roof on top of asphalt shingles is feasible; however, it’s critical to consult local building authorities first. In some regions, the roofing system may only be installed over one layer of existing shingles, while other areas may allow two. Generally, placing a metal roof over a single layer of asphalt shingles is permitted in most locales.

can you put a metal roof over shingles

Installing Metal Roof Over the Shingles: Pros and Cons

Here’s a list of the pros and cons of installing a metal roof over shingles:

1. Pros:

● It Saves Time and Money

Positioning a metal roof over existing shingles saves time and is generally more cost-effective than removing old shingles. By skipping the removal, you preserve the initial roof deck as an additional line of defense against future leaks, enhancing the longevity of your roofing system.

● Added Insulation

By installing a metal roof over shingles, you can add insulation that can help reduce energy costs by regulating temperature.

● Better Protection

A metal roof provides improved Protection from severe weather conditions like strong winds and heavy rainfall. Moreover, it offers more excellent fire resistance than shingles, particularly in areas susceptible to wildfires.

● Environmentally Friendly

Putting a metal roof over existing shingles can help reduce waste from removing and disposing of old shingles, thereby promoting environmental sustainability.

● Minimal Maintenance

Metal roofs need very little maintenance compared to shingle roofs and have a longer lifespan, resulting in fewer replacement requirements.

2. Cons:

● Weight Concerns

Installing a metal roof over shingles can cause issues with the weight of the roof structure. This is because the additional weight of the metal roof may exceed the capacity that the structure was designed to handle, leading to structural problems.

● Moisture Buildup

Improper installation of a moisture barrier when layering a metal roof over existing shingles can trap moisture between the layers of roofing materials. This trapped moisture can lead to water damage and mold growth, compromising the structural integrity of the roof deck.

● Aesthetics

Metal roofs may not fit precisely with the old shingles, causing an uneven appearance that is not visually attractive.

● Building Codes

It’s necessary to check with your local department before installation, as some local building codes prohibit installing a metal roof over shingles.

● Reduced Lifespan

Utilizing a metal roof to repair and cover deteriorating shingles may, in the long run, shorten the lifespan of the metal roofing system compared to installing it on a new and clean surface. This method could impact the overall effectiveness and durability of the new metal roof.

The Cost of Installing Metal Roof Over the Shingles

The cost of installing a metal roof over shingles can vary depending on several factors, such as the size and complexity of the roof, the type of metal used, and the home’s location. Despite this, homeowners can save money by installing a metal roof over their old shingles instead of removing them first.

Typically, a metal roof installation costs from $7 to $10 per square foot, which covers the cost of the metal panels, installation, and materials. However, if homeowners opt for a metal roof installation over shingles, the cost can decrease by $1 to $2 per square foot. This cost reduction is due to eliminating the need to remove and dispose of old shingles.

Read also: Tips on Where to Put Screws on Metal Roof

Can you put a metal roof over the shingles? Yes, you can. But whether or not it’s the best option for your home will depend on your specific needs and circumstances. By carefully weighing the pros and cons and working with a reputable roofing contractor, you can make an informed decision that will help protect your home for years.

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RoofLast is an experienced author and roofing expert. With years of practical experience in the field authored several informative articles on various aspects of roofing, including installation, maintenance, and repair