Is It Worth It? Installing Metal Roof Over Shingles

Key Highlights

• Putting a metal roof on top of existing shingles may seem like a good idea at first. But it can lead to bigger costs later.
• Before you consider this, check how old your roof is. Look for any damage or signs that it might be at the end of its lifespan.
• Installing metal roofing over shingles can hide problems. This can make repairs harder and more costly in the future.
• Skipping the complete tear-off might feel easier, but it means you won’t check important parts like the underlayment and decking. This can cause bigger issues later.
• Always talk to a roofing contractor you trust before making a decision. They can help you evaluate your roof and provide good advice.

Introduction

Metal roofing is becoming more popular because it can last a long time. A new metal roof, however, can be costly. Some homeowners look for ways to save money on this. One way is to put a new metal roof on an old asphalt shingle roof. At first, this may seem like a good idea. But it is very important to know what could happen and the risks of putting metal roofing over an existing shingle roof before you decide.

Understanding the Basics of Metal Roofing Over Shingles

Installing a metal roof over existing shingles involves placing the new metal roofing material directly atop the current shingle layer without removing it. This method can offer significant savings by reducing labor costs and eliminating the need to dispose of old roofing materials.

However, this approach comes with potential risks. By not removing the old shingles, any pre-existing issues—such as leaks, rot, or structural problems—may remain hidden and unaddressed. These problems could worsen over time, potentially leading to more extensive and costly repairs down the line.

Additionally, it’s crucial to verify whether local building codes allow for this type of installation, as some areas may have specific restrictions or requirements to ensure safety and compliance. Consulting a roofing professional is advisable to assess the condition of your existing roof and determine if installing a metal roof over shingles is the best solution for your home.

What Is Metal Roofing and Its Benefits?

Metal roofing is increasingly popular due to its numerous benefits. It is much stronger and more durable than traditional asphalt shingles, capable of withstanding harsh weather conditions. While the initial cost might be higher, its longer lifespan results in significant savings over time.

Available in various colors and styles, metal roofing offers homeowners the flexibility to choose designs that match their home’s aesthetic, enhancing its overall appearance and curb appeal.

Moreover, metal roofing is energy-efficient. Its reflective surface reduces heat absorption, keeping homes cooler in summer and lowering energy bills. This makes it not only a cost-effective choice but also an environmentally friendly option.

Key Considerations Before Installation

Starting a roofing project means you need to think about several important things. First, check your existing roof. See how old it is, if it has any damage, and how worn out it looks. This information helps you know if you can put a metal roof over it.

Next, you need to ensure that there is good ventilation. If you add a metal roof over existing shingles, it may trap moisture. This moisture can lead to mold and mildew. Proper ventilation is key to preventing these problems.

It’s a good idea to talk to a trustworthy roofing contractor. They can give you expert advice and help. They will look at your roof’s condition and recommend what it needs.

Assessing Your Current Roof’s Condition

Before you think about putting a metal roof over your existing shingles, take a good look at your current roof. Start with a visual check. Look for shingles that are curled, cracked, or missing. These signs will help you understand the roof’s condition. Also, check for sagging, water damage, or moss. These could suggest more serious problems underneath.

If your roof is severely damaged or at the end of its lifespan, installing a metal roof may not be advisable. Assess the roof’s condition and address any foundational issues first to ensure the new roof performs well. Consult a professional roofing contractor for suitable solutions.

Identifying Signs of Damage on Shingles

Old shingles near the end of their lifespan will show clear signs. You should check for cracked, broken, or missing shingles. These can mean that they are old or have been damaged by the weather. If you see gaps in the shingles, you might notice the underlayment underneath. This can cause the roof to leak more easily.

• Look for curling or buckling shingles.
• This bending shows the shingles have been there too long or were not installed right.
• This can affect how well they drain water.

Finally, check the gutters for a lot of shingle granules. It’s normal for a few granules to come off over time. But if you find many granules, this means the shingles are getting old. They are near the end of their lifespan.

The Impact of Installing Over an Old Roof

Installing a new metal roof over an existing old roof might initially seem like an economical decision, potentially allowing homeowners to save on costs associated with roof removal and disposal. However, several significant drawbacks should be carefully considered before proceeding with this approach. One of the primary concerns is the additional weight that a new metal roof imposes on the structure. This added weight can exert undue stress on the roof deck, which, over time, may lead to structural issues such as sagging or even more severe damage to the building’s framework.

Adding a new roof over an old one can effectively conceal existing problems beneath the surface. If the underlying decking is rotting or already damaged, these issues might remain unnoticed under the layers of old shingles. Without addressing these hidden damages, they can progressively worsen over time, potentially compromising the integrity and durability of your newly installed metal roof, making it less effective and reliable.

In simple terms, while the idea of installing a new roof over an existing one might initially appear to be a cost-saving measure, it is essential to recognize that this approach can lead to unforeseen expenses and complications in the future. The hidden costs and potential long-term problems associated with this method highlight the importance of thoroughly evaluating the condition of your current roofing structure before deciding on such installations. Taking the time to address existing issues and possibly opting for a complete roof replacement might be a more prudent investment, ensuring both safety and longevity for your new roofing system.

The Installation Process Explained

Installing metal roofing typically follows a straightforward process, but it is important to note that this can vary significantly depending on the specific project requirements and conditions. To begin with, you should carefully check and assess the current roof structure. Examine its overall condition and determine whether it can adequately support the additional weight and structure of the new metal roofing layer.

Once you have ensured that the existing roof is in suitable condition, the next step involves placing a protective layer over the current shingles. This step is crucial as it provides a smooth and flat surface onto which the metal roof panels will be installed. This protective layer not only helps in creating an even base but also serves as an additional barrier against moisture and weather elements.

Following this preparation, the metal panels are meticulously positioned and secured in place. It is essential to overlap each panel correctly, ensuring they fit together seamlessly. After positioning, you must secure them firmly and seal all joints and seams thoroughly to prevent any potential leaks. Proper overlapping, securing, and sealing are key to ensuring the metal roof is watertight and durable, providing effective protection for your home or building.

Preparatory Steps for Metal Roof Installation

Before you put on a new roof, you should prepare the existing roof first. Start by cleaning the surface. Get rid of any trash, leaves, and dirt. Then, look for any issues. Fix any small problems or replace parts of the old roof. This will help make sure the new roof has a solid and even base.

Next, you should add a waterproof underlayment or membrane. This layer protects the roof deck from moisture. Moisture can cause leaks or water damage. It’s also a good idea to add extra insulation now. This will help the roof be more energy-efficient. It will also provide protection against heat and cold.

• Make sure there is good airflow.
• It is important to have enough ventilation under the metal panels.
• This will help stop condensation and mold growth.
• It will also keep the new roof in good shape for a longer time.

Step-by-Step Guide to Installing Metal Roof Over Shingles

Putting a metal roof over shingles is not usually recommended. But here is an easy guide to help you with the steps:

• Check the existing roof: Look closely at your roof. Fix or replace any broken or missing shingles. Make sure the surface is clean and clear of debris.
• Put down furring strips: Attach wooden furring strips over the shingles. Make sure they are level and straight from the eaves to the top. This will create a strong surface for the metal panels.
• Add the underlayment: Lay a breathable, synthetic underlayment over the furring strips. Overlap the seams to keep water out.
• Put down metal panels: Start at the leaves and move your way up. Overlap the panels as directed by the manufacturer. Use the right screws and sealants to keep it secure and dry.
• Add flashing: Install flashing around places like chimneys, vents, and skylights to stop leaks.

Conclusion

In conclusion, putting a metal roof over your shingles can bring many good benefits for your roof replacement. These benefits include being strong, saving energy, and giving better protection. It’s important to check your roof’s condition now. You should also think about important factors before installing it. When you understand the process and what it offers, you can make a smart choice that fits your roofing needs and goals. Remember, being ready and taking the right steps are key for a successful metal roofing project. If you feel unsure about the process or need help, talk to roofing experts. They can help you make a smooth switch to a metal roof over shingles.

Frequently Asked Questions

Can Metal Roofing Be Installed Directly Over Old Shingles?

Yes, you can put a new roof on top of an old shingle roof. However, this might not be the best choice. You can do this using furring strips and new underlayment. But this method may trap moisture and hide existing issues. This can cause leaks and more damage later. The leaks will go the path of least resistance.

What Are the Long-Term Benefits of Metal Roofing Over Shingles?

Installing metal over shingles is now a common choice. However, it doesn’t provide the long-term benefits of a full roof replacement. Your old roof might seem to be in good condition, but there can still be weak spots in different parts. A single roof leak can risk the entire system.

Is it better to remove shingles before installing metal roof?

Removing shingles before putting on a metal roof is a good idea. This helps make a smooth surface for better installation. It also stops problems later, especially because of the weight of the metal. While it may cost more at first, this can help your new roof last longer and work better.

How do I know if my current roof can support a metal roof?

Thoroughly inspect the roof for signs of damage, wear, age-related issues, and structural integrity. Carefully examine the shingles for curling, cracking, or missing pieces, as these indicate vulnerabilities. Look for sagging areas or uneven sections suggesting structural problems. Check for water damage, like dark spots or stains on ceilings, indicating leaks. For a comprehensive evaluation, consult a professional roofer who can provide an expert assessment and recommend necessary repairs or replacements.