Thinking about a new roof but dreading the tear-off? Good news: in many cases, you can install a metal roof right over your shingles.
It saves time, cuts mess, and might even save you money. In this guide, we’ll dive into how it works, what to watch out for, and whether it’s the right move for your home.
Can you put a metal roof over a shingle roof?
Yes, you can put a metal roof over shingles! This saves time and labour, but make sure your roof structure can support the extra weight before going ahead with the installation.
Key Takeaways
- Installing a metal roof over an existing shingle roof can save time and money on removal.
- Proper inspection and preparation are essential to ensure the installation is successful.
- There are specific codes and regulations that must be followed, depending on where you live.
Benefits of Installing a Metal Roof Over Shingles
There are several advantages to installing a metal roof over an existing shingle roof. Below are the key benefits that make this option popular among homeowners:
Cost Savings
One of the primary reasons homeowners opt for installing a metal roof over shingles is the cost savings.
Removing an old roof can be a time-consuming and expensive process, but by placing the metal roof directly over the existing shingles, you can save on both labour and disposal costs.
This can significantly reduce the overall price of the project.
Quicker Installation
Since you don’t need to remove the old shingles, the installation process is much faster.
A metal roof can often be installed in a fraction of the time compared to a full roof replacement, which is particularly beneficial if you need to get the job done quickly.
Added Insulation
Installing a metal roof over shingles can provide an extra layer of insulation, which can help with energy efficiency.
The metal roof reflects heat away from the home, keeping the interior cooler in the summer, while the shingles underneath provide additional insulation during the winter.
Durability and Longevity
Metal roofs are known for their long lifespan. With proper installation, a metal roof can last 40-70 years, while asphalt shingles typically need to be replaced after 20-30 years.
By installing a metal roof over shingles, you’re essentially getting a roof that’s built to last much longer, without the hassle of frequent replacements.
Eco-Friendly Option
By installing a metal roof over your existing shingles, you’re keeping old materials out of landfills.
Metal roofs are also often made from recycled materials and can be recycled again at the end of their life, making them an eco-friendly roofing solution.
Potential Challenges to Consider
While there are clear benefits, installing a metal roof over shingles isn’t always the right choice. There are a few challenges to consider before making your decision.
Weight of the Metal Roof
Adding a metal roof on top of an existing shingle roof can increase the overall weight of the structure.
Depending on the type of metal roof and the condition of the underlying shingles, this could put additional stress on the framing of the roof.
In some cases, a structural engineer may need to assess whether the existing roof structure can handle the added weight.
Roof Height and Aesthetics
If you add a metal roof over shingles, the height of the roof will increase, which can affect the appearance of your home.
It may also create issues with flashing around chimneys, vents, and other roof protrusions.
If you have a steeply sloped roof, the added height may not be as noticeable, but on a flat roof, it could be a more significant change.
Roof Ventilation
Proper roof ventilation is essential to avoid moisture buildup and prevent mold growth. When you install a metal roof over shingles, it can reduce airflow between the two layers.
This is something you’ll need to account for during the installation process.
A professional installer will know how to ensure adequate ventilation for both the metal roof and the existing shingles.
Building Codes and Regulations
Before you proceed with the installation, it’s important to check local building codes and regulations.
Some municipalities may have restrictions on installing a metal roof over shingles.
For example, certain areas may require the removal of the old shingles before a new roof can be installed, while others may have regulations regarding the weight and materials used in roofing.
The Installation Process: What to Expect
If you decide that installing a metal roof over shingles is the best option for your home, the next step is to understand the installation process. Here’s what you can expect:
Inspection of the Existing Roof
Before any installation begins, the condition of your existing shingle roof must be assessed.
The roofing contractor will check for any damaged shingles, leaks, or structural issues that could affect the new roof.
If there are any significant issues, they may recommend repairing or replacing the shingles before proceeding.
Preparation and Installation of Furring Strips
To provide a stable foundation for the metal roof, the existing shingles may need to be covered with furring strips.
These are thin wooden strips that are attached to the roof deck in a parallel pattern, creating a gap between the shingles and the metal roof.
The furring strips allow for better ventilation and ensure that the metal panels are properly aligned.
Frequently Asked Questions (FAQs)
1. Can I install a metal roof over a roof with multiple layers of shingles?
It’s not recommended to install a metal roof over multiple layers of shingles, as this can add excessive weight to the structure and cause potential issues.
2. Will a metal roof installed over shingles help reduce my energy bills?
Yes, a metal roof can improve your home’s energy efficiency by reflecting heat away from the house, keeping the interior cooler in the summer and warmer in the winter.
3. How long does a metal roof last compared to shingles?
A metal roof can last 40-70 years with proper maintenance, while asphalt shingles typically last 20-30 years before needing replacement.
Conclusion
Installing a metal roof over shingles can be a convenient and cost-effective solution for homeowners looking to update their roof.
It offers several benefits, including better energy efficiency, increased durability, and reduced installation costs.
However, it’s important to weigh the pros and cons and ensure that your existing roof is in good condition before proceeding with this option.