Key Highlights
- Installing a metal roof over existing shingles is called a “metal roof-over.”
- Metal roof-overs can save money on labor and material costs but can cover up potential future problems.
- Building codes may prevent you from installing a metal roof over old shingles.
- It’s vital to have a roofing contractor inspect your roof’s decking before installing a metal roof over shingles.
- You should factor in crucial roofing components not being replaced by installing over existing shingles.
Introduction
The popularity of metal roof installations has exploded in recent years. However, the higher price point compared to an asphalt shingle roof deters some homeowners. This leads them to more affordable options, like installing a new metal roof over their existing shingles. But is this a good idea? While it sounds good on the surface, like anything else, there’s more to it than meets the eye. Let’s take an informative look at the advantages, considerations, and potential drawbacks of putting a metal roof over shingles to help you make the best choice for your roofing project.
The Basics of Metal Roof Installation Over Shingles
A metal roof installation over shingles involves placing new metal panels directly on top of the existing shingle roof. This method eliminates the need for a complete tear-off of the old roofing materials, which can mean significant savings on labor costs and disposal fees. Additionally, it reduces the overall installation time, making it a faster process. However, it is not suitable for all roofing systems, and there are crucial factors to consider before going this route to ensure its long-term viability.
What Defines a Metal Roof-Over?
A metal roof-over is a roofing method where a new metal roof is installed over existing shingles instead of tearing off the old roof down to the roof deck. It is a viable option in many cases, giving homeowners an alternative to a complete roof replacement. The essential aspect of a successful metal roof-over is ensuring the existing shingles are in good condition, lying flat, and capable of providing a stable base for the new metal panels. Any significant damage, curling, or deterioration of the existing shingles will compromise the integrity of the metal roof-over. A thorough inspection by a qualified roofing professional is necessary to determine the suitability of an existing roofing system for a metal roof-over.
Key Advantages of Installing Metal Roofs Over Shingles
One of the main benefits homeowners see as a major plus is the potential cost savings associated with a metal roof-over. Bypassing the complete tear-off of the old roof saves money on labor and disposal fees. With the rising costs of roofing materials, every penny counts! Aside from the financial aspect, a metal roof-over offers a couple of benefits:
- Increased Energy Efficiency: Metal roofs reflect solar heat, which leads to lower energy consumption for cooling, making your home more energy-efficient in the long run.
- Enhanced Curb Appeal: A new metal roof instantly upgrades your home’s aesthetic and boosts curb appeal with attractive styles and a variety of colors.
Essential Considerations Before a Metal Roof-Over
While installing a metal roof over shingles has advantages, carefully weigh the potential drawbacks before deciding. One vital factor is the condition of your existing shingles. If they are nearing the end of their lifespan or showing signs of damage, a metal roof-over might hide underlying problems, leading to future issues. Additionally, consult your local building codes to ensure they allow metal roof-overs and meet any specific requirements.
Assessing the Condition of Current Shingles
Before you think about a metal roof-over, thoroughly assess if your current shingles can handle it. First, check if they are in good condition, meaning no missing, curled, or broken shingles. Also, look for any signs of granule loss. Shingle granules play a vital role in protecting your roof from harmful UV rays. If there is significant granule loss evident, it indicates that your shingles are deteriorating and may not be able to support the weight of a metal roof. Lastly, consider the age of the existing shingles. As a general rule of thumb, old shingles beyond their intended lifespan are not ideal for a metal roof-over. Over time, the shingles become brittle and less effective at providing a stable base for the new roof.
Understanding Local Building Codes and Requirements
It’s crucial to consult your local building codes and requirements before installing a metal roof over existing shingles. Building codes vary by region and address safety and structural concerns for roof replacements. You must obtain the necessary permits and inspections to ensure your metal roof-over adheres to these guidelines. In many cases, local building codes may restrict or prohibit installing a metal roof over shingles, especially if there are already multiple layers of roofing on your home. This is primarily due to concerns about the combined weight of the layers exceeding the structural capacity of the roof. Before proceeding, check with your local building department to determine if your area permits metal roof-overs.
Step-by-Step Guide to Installing Metal Roof Over Shingles
While this section outlines a general guide, remember that professional roofing contractors should handle metal roof installations for safety and proper execution. The installation process involves critical steps to ensure the metal roof’s longevity and performance. Let’s break it down:
Preparing the Existing Roof
Before installing the metal panels, it’s essential to properly prep the existing shingle roof. Start by inspecting the entire surface, replacing any missing or damaged shingles to create a smooth and even base. Next, check for and repair any protruding nails or fasteners, as these can hinder the installation of the metal panels and may lead to leaks. Also, consider adding a layer of roofing felt or synthetic underlayment over the existing shingles for added protection and a water-resistant barrier. This step helps create a smooth surface and provides an extra layer of protection between the existing shingle roof and the back of the metal roofing panels.
Installation Techniques for Metal Roofs Over Shingles
When installing metal roofing over shingles, contractors use specific techniques to ensure a secure and long-lasting result. The installation process typically begins by installing a new underlayment, a crucial component acting as a second line of defense against water intrusion, directly over the existing shingles. This underlayment is typically a high-quality, breathable synthetic material designed to prevent moisture buildup while allowing any trapped moisture to escape. Next, install the metal panels, starting from the roof’s edge and working upwards. Fasten the metal panels to the roof deck through the existing shingle roof using specialized screws designed to seal around the fastener, preventing leaks.
Conclusion
In conclusion, before deciding to put a metal roof over shingles, consider the benefits and potential concerns. While it can offer durability and energy efficiency, ensure your current shingles are in good condition and comply with local regulations. Proper installation is crucial for long-term success. Understanding the process and seeking professional advice can help you make an informed choice. If you’re looking to enhance your property with a metal roof, weigh the advantages against the necessary preparations and installation steps to ensure a successful project.
At Metal Roof Mobile AL, we ensure our clients receive the best possible outcomes. Our commitment to quality workmanship and customer satisfaction is unwavering, making us the top choice for residential Roofing services in our community.
Frequently Asked Questions
Can you install a metal roof over wet shingles?
It is not recommended to install a metal roof over wet shingles. Any existing moisture trapped between the shingles and the metal roof will not have proper ventilation and can lead to mold, mildew, or rot. The new underlayment acts as a second line of defense, but you shouldn’t risk possible moisture buildup.
What is the lifespan of a metal roof installed over shingles?
The lifespan of a metal roof installed over shingles remains similar to installing it on a bare roof deck. Depending on the type of metal roofing, you can expect it to last 40-70 years. However, remember that the underlying layers of shingles won’t provide a second benefit to its lifespan.
