Thinking about upgrading to a metal roof? It’s a great choice for durability, energy efficiency, and longevity.
But if you already have asphalt shingles, you may be wondering, “Can I put a metal roof over them?”
Keep reading to discover the benefits, challenges, and key things to consider before making this decision.
Can You Put a Metal Roof Over the Shingles?
Yes, you can install a metal roof over shingles. It’s a cost-effective solution that avoids the hassle of removing the old shingles while offering durable and long-lasting protection.
Key Takeaways
- Installation over Shingles: Installing a metal roof over existing shingles can save time and money, but it requires careful preparation.
- Cost Savings: You can save on removal and disposal costs by installing a metal roof over shingles.
- Structural Considerations: It’s important to ensure your roof can handle the additional weight of a metal roof.
Can You Install a Metal Roof Over The Shingles?
Yes, it is possible to install a metal roof over existing shingles.
This process is called a “retrofit” installation, where the new metal roofing system is applied directly over the old shingles without removing them.
While this is a common practice, it’s not always the best option for every home. Here are the key factors to consider:
The Condition of Your Current Roof
Before deciding to install a metal roof over shingles, you must ensure your existing roof is in good condition.
If the shingles are severely damaged, warped, or compromised, it’s best to replace them entirely rather than cover them with metal.
A metal roof can only be installed over a solid, stable base.
If your shingles are still in good shape but showing signs of aging (like slight curling or minor wear), they might still be suitable for a retrofit installation.
However, it’s essential to check for any moisture damage, moss growth, or rotting areas, as these could affect the integrity of the new roof.
Cost and Time Savings
One of the main reasons homeowners opt to install a metal roof over shingles is to save money and time.
Normally, the process of replacing shingles involves the removal of the old roof, which can be labor-intensive and costly.
By choosing to install a metal roof over the shingles, you can avoid the cost of tearing off the old roof and the associated labor. This can lower your overall roofing costs.
A metal roof installation over shingles typically takes less time than a complete roof replacement, as the old shingles don’t need to be removed.
This is especially beneficial if you need a quick roof upgrade.
Advantages of Installing a Metal Roof Over Shingles
There are several benefits to installing a metal roof over shingles, particularly if your roof is still structurally sound and you want a quicker, more cost-effective upgrade.
Cost-Effective Solution
As mentioned, installing a metal roof over shingles can save you money. By skipping the removal of the old roof, you can save on both disposal and labor costs.
This can make a metal roof installation significantly more affordable, especially for larger homes.
Faster Installation
Because you won’t need to remove the old roofing materials, the overall installation time is reduced.
While the exact time will depend on the size of the roof, installing a metal roof over shingles can often be completed within 1-2 days for a typical residential home.
Better Insulation
Metal roofs are great for reflecting sunlight, which helps keep your home cooler in the summer. Installing a metal roof over shingles can also provide an additional layer of insulation.
The gap between the old shingles and the new metal roof creates an air space that can improve the overall energy efficiency of your home, reducing heating and cooling costs.
Durability and Longevity
Metal roofs are incredibly durable and can last 40 to 70 years, whereas asphalt shingles typically last between 15 and 30 years.
By adding a metal roof over shingles, you’re investing in a long-lasting roofing solution that will require less maintenance and provide better protection against the elements.
Disadvantages and Considerations
While installing a metal roof over shingles has its benefits, there are also a few drawbacks and considerations to keep in mind:
Increased Weight
Metal roofs are relatively lightweight compared to other roofing materials like tile or slate. However, adding a layer of metal on top of existing shingles adds weight to the roof structure.
Most homes can handle the added weight, but if you’re considering metal roofing in Savannah, GA, it’s wise to have a professional assess your roof’s structure to confirm it can support the extra load.
DBM is one of the top roofers in Beaufort, sc. If you live in this location, you should consider our service.
Roof Height and Aesthetic Impact
Adding a metal roof over shingles will raise the height of your roof, which may affect your home’s curb appeal.
This can be a consideration if your home has low eaves or if you live in an area with strict aesthetic guidelines.
Additionally, the shingles underneath may create a visible bump or uneven texture that might affect the smoothness of the new roof’s appearance.
Potential for Trapped Moisture
While a metal roof provides excellent protection from the elements, moisture can still get trapped between the old shingles and the new metal roof if proper installation steps aren’t followed.
This could lead to issues such as mold or mildew growth, which can affect the integrity of your home.
To prevent this, ensure the roof is properly ventilated, and the old shingles are clean and dry before installation.
How to Install a Metal Roof Over Shingles
If you decide to install a metal roof over your existing shingles, it’s important to follow the correct process to ensure a successful and long-lasting installation.
Here’s a basic outline of the steps involved:
Inspection of the Current Roof
Before starting, inspect the existing roof to ensure it is structurally sound. Look for any damaged shingles, leaks, or signs of rot. If the roof is in poor condition, it may be better to replace the shingles before installing the metal roof.
Install a Waterproof Membrane
Install a waterproof underlayment over the existing shingles to provide an extra layer of protection. This underlayment will help prevent leaks and ensure the roof remains waterproof.
Install Furring Strips (if needed)
In some cases, furring strips (small strips of wood or metal) are installed over the old shingles to create an air gap between the shingles and the new metal roof.
This gap helps with ventilation and reduces the risk of trapped moisture. It also provides a flat surface for the metal panels to be secured.
Lay the Metal Panels
Once the underlayment and furring strips (if necessary) are installed, the metal roofing panels are laid down and secured.
Metal roofs can be installed as interlocking panels or as a series of individual metal shingles. Be sure to follow the manufacturer’s instructions for proper installation.
Seal and Finish
Once the panels are in place, seal the roof to prevent leaks and secure any seams. Finally, trim any excess material, install new flashings around chimneys and vents, and make sure everything is tightly secured.
Frequently Asked Questions
1. Can I install a metal roof over my existing shingles?
Yes, you can install a metal roof over existing shingles, provided the roof is in good condition and structurally sound.
2. What are the advantages of installing a metal roof over shingles?
Installing a metal roof over shingles can save time and money, provide added insulation, and extend the lifespan of your roof without the need for removal.
3. Do I need to remove my old shingles before installing a metal roof?
Not necessarily. In most cases, you can install a metal roof directly over the existing shingles, as long as they are in good condition.
Conclusion
Installing a metal roof over shingles can be a smart, cost-effective solution for homeowners looking to upgrade their roofing system without the added cost and time of removing the old roof.
While there are several benefits—such as saving on labor and disposal fees, improving energy efficiency, and extending the life of your roof—it’s important to weigh the potential downsides, such as added weight and moisture concerns.
Before you begin, ensure your existing roof is in good condition, and consult with a professional roofing contractor to determine the best approach for your home.
With the right preparation and installation, a metal roof over shingles can provide lasting protection, enhance the curb appeal of your home, and offer peace of mind for years to come.