How to install metal roofing over shingles

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When you think of a metal roof, you may picture a utilitarian structure, like a barn or a factory. But in recent years, metal roofs have undergone a transformation, becoming a stylish and popular choice for homes and businesses alike.

One of the greatest transformations is installing a metal roof over shingles. This has made it cost-effective as well. With their sleek, modern look and impressive durability, it’s no wonder that metal roofs over shingles are becoming a top choice for homeowners and commercial property owners.

Why are people installing metal roofs over shingles?

In the past, removing an old shingle roof before installing a new one was time-consuming and expensive. But thanks to the growing popularity of metal roofs, homeowners now have a more cost-effective and efficient option: installing a metal roof directly over their existing shingles.

One of the main reasons why people choose to install metal roofs over shingles is the convenience factor. By leaving the old shingles in place, the installation process is much faster and easier, which can help to reduce labor costs and minimize disruption to the homeowner’s daily routine.

How to install metal roof over shingles?

Installing a metal roof over an existing roof or shingles involves a specific process different from traditional installation. Here’s what the process typically entails:

Inspection

The first step is to inspect the existing roof to ensure that it is in good condition and can support the weight of the metal roof. Any damage or issues with the roof should be addressed before installation begins.

Preparation

Next, the existing roof is prepared for installation. This involves cleaning the surface to remove any dirt, debris, or loose shingles that may be present.

Installation of Battens

Once the surface is clean, horizontal battens are installed over the shingles. These are typically made of wood or metal and provide a surface for the metal roofing panels to be attached to.

Installation of Metal Roofing Panels

Source: Wikihow

The metal roofing panels are then attached to the battens using screws or other fasteners. The panels are typically installed from the bottom up, with each panel overlapping the one below it to create a waterproof seal.

Also Read: Stone Coated Metal Roofing

Flashing Installation

Flashing is installed around the edges of the roof and any other areas where water may seep through, such as around chimneys or vents.

Installing a metal roof over shingles is a specialized process that requires expertise and experience to ensure the roof is installed correctly and waterproof. While it can be a cost-effective and efficient option, working with a professional roofing contractor with experience with this installation type is essential to ensure that the job is done right.

Benefits of installing metal roof over shingles

Here are some pros and cons to consider before making this decision:

Cost-effective

One of the primary benefits of installing a metal roof over existing shingles is that it can save homeowners significant money on labour costs. By avoiding the time and expense of tearing off the old roof, homeowners can save up to 25% on the project’s overall cost.

Energy-efficient

Metal roofs are highly reflective, reflecting sunlight rather than absorbing it. This can help reduce the heat that enters the home during the summer months, resulting in lower cooling costs.

Durable

Metal roofs are known for their longevity and durability. They can withstand extreme weather conditions such as heavy rain, strong winds, and hail. Additionally, they do not rot, warp, or crack like traditional roofing materials.

Lightweight

Metal roofs are significantly lighter than conventional roofing materials, so they stress the home’s structure less. This can be particularly beneficial for older homes or homes with a weaker foundation.

Things to consider before making this decision

Uneven Surface

If the existing shingles are not in good condition, or the roof has multiple layers of shingles, the surface may not be smooth and even. This can create problems during the installation process, as well as over time as the metal roof shifts and settles.

Trapped Moisture

When installed over existing shingles, a metal roof can create an air pocket between the two layers. This air pocket can trap moisture, leading to corrosion and eventually causing the metal roof to fail prematurely.

Reduced Lifespan

While metal roofs are known for their durability, installing them over existing shingles can reduce their lifespan. This is because the metal roof will be exposed to more significant temperature fluctuations and moisture, which can cause it to degrade more quickly.

Additional Weight

While metal roofs are lightweight compared to traditional roofing materials, adding a metal roof on top of shingles can still add extra weight to the home’s structure. If the home’s structure is not strong enough to support the additional weight, it can cause structural damage over time.

While there are some benefits to installing a metal roof over existing shingles, there are also potential drawbacks to consider. Homeowners should carefully evaluate their individual situation and consult with a professional roofer the second time around to determine the best course of action for their home.

How Much Does it Cost to Install a Metal Roof Over Shingles?

Installing a metal roof over shingles can be a cost-effective option, saving homeowners up to 25% on the overall project cost. However, the installation cost can vary depending on the type of metal roofing system used, the roof’s size, and the installation’s complexity. On average, installing a metal roof over shingles can range from $5 to $15 per square foot.

Can You Put Metal Roofing Directly Over the Shingles?

Yes, it is possible to install metal roofing directly over shingles. However, it is important to note that some roofing codes and regulations may prohibit this method, so it’s best to check with local authorities before proceeding. Additionally, the condition of the existing shingles should be carefully evaluated before installation to ensure that they are in good enough condition to provide a suitable base for the metal roofing.

Is It Better to Remove Shingles Before Installing a New Metal Roof?

While it is possible to install a metal roof over existing shingles, it is generally recommended to remove the old shingles before installation. This is because it allows for a smoother surface for the metal roofing to be installed on and eliminates the risk of trapping moisture between the two layers, which can lead to corrosion and other issues.

Additionally, removing the old shingles allows for a more thorough inspection of the roof deck and any underlying structural issues that may need to be addressed.

Can You Put Metal Roofing on Top of Damaged Shingles?

It is not recommended to install metal roofing on top of damaged or deteriorated shingles, as this can lead to unevenness in the roof surface and potentially compromise the integrity of the metal roofing. If the existing shingles are damaged, it is best to remove them before installing a new metal roof.

Is Metal Roofing Worth the Cost? Final Verdict

Metal roofing can be more expensive than traditional roofing materials such as asphalt shingles. However, it offers a range of benefits, such as durability, energy efficiency, and low maintenance costs that can make it a worthwhile investment over time.

Additionally, metal roofing systems can last up to 50 years or more, which can provide significant long-term cost savings compared to replacing asphalt shingles every 15-20 years. Ultimately, the decision of whether metal roofing is worth the cost will depend on the individual homeowner’s needs, preferences, and budget.

A professional roofing supplier like 2nd Time Around Co in Colorado can help you determine if your existing shingles can afford to install a metal roof over it.

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