Putting Tin Roof Over Shingles: Benefits, Considerations, and Steps

When it comes to roofing projects, many homeowners consider upgrading their existing shingle roof with a tin roof. Putting tin roof over shingles is a practical option that can save time, reduce costs, and provide an aesthetically pleasing and durable finish. However, this project requires careful planning, knowledge of building codes, and understanding the benefits and drawbacks of this approach. This article will delve into everything you need to know about installing a tin roof over shingles, ensuring you make an informed decision.

Why Consider Putting Tin Roof Over Shingles?

1. Cost-Effective Solution

One of the primary reasons homeowners opt for putting tin roof over shingles is the potential cost savings. Removing an old shingle roof can be labor-intensive and expensive. By installing the tin roof directly over the existing shingles, you can bypass the need for a complete tear-off, significantly reducing labor costs.

Read too: How To Replace Roof Shingles That Blew Off: A Comprehensive Guide

2. Time-Saving

Installing a new roof is a major project that can disrupt your daily life. By placing a tin roof over your existing shingles, the project can be completed faster, as there is no need for tear-off and disposal of the old roofing material. This can be especially beneficial if you’re on a tight schedule or need the project completed quickly.

3. Enhanced Durability and Longevity

Tin roofs are known for their durability and long lifespan, often lasting 40 to 70 years or more. By adding a tin roof over your existing shingles, you can enhance the protection of your home against the elements. Tin roofs are resistant to wind, hail, and even fire, providing an additional layer of security.

4. Improved Energy Efficiency

Tin roofs are reflective, meaning they can help keep your home cooler in the summer by reflecting sunlight. This can lead to reduced energy bills, as your air conditioning system won’t have to work as hard to maintain a comfortable temperature. When combined with proper insulation, putting tin roof over shingles can improve your home’s overall energy efficiency.

5. Aesthetic Appeal

Tin roofs offer a classic, timeless look that can enhance the curb appeal of your home. They come in various styles, colors, and finishes, allowing you to choose a design that complements your home’s architecture.

Considerations Before Putting Tin Roof Over Shingles

1. Local Building Codes and Regulations

Before you start any roofing project, it’s essential to check local building codes and regulations. Some areas may have specific guidelines regarding the installation of a tin roof over shingles, such as weight limits or the need for additional structural support. Failing to comply with these regulations can lead to fines, delays, or even the need to redo the entire project.

2. Condition of Existing Shingles

While putting a tin roof over shingles is a viable option, the existing roof must be in relatively good condition. If the shingles are severely damaged, curling, or have significant mold or mildew growth, it might be better to remove them before installing the tin roof. Installing tin roofing over a damaged roof can lead to further problems down the line, such as trapped moisture and reduced structural integrity.

3. Weight Considerations

Although tin roofing is relatively lightweight, adding it over an existing shingle roof increases the overall weight on your home’s structure. It’s crucial to ensure that your roof’s framework can handle this added weight. Consulting a structural engineer or a professional roofing contractor can help determine if your home can support a tin roof over shingles.

4. Ventilation Needs

Proper roof ventilation is essential to prevent moisture buildup, which can lead to mold, mildew, and wood rot. When putting tin roof over shingles, you need to ensure that your roof’s ventilation system is adequate. This may involve adding or adjusting vents to maintain proper airflow.

5. Insulation Considerations

Adding a tin roof over shingles can impact your home’s insulation. To maintain energy efficiency, consider adding a layer of insulation between the shingles and the tin roof. This can help prevent heat transfer, keeping your home warmer in the winter and cooler in the summer.

Steps to Install Tin Roof Over Shingles

1. Inspection and Preparation

Begin by thoroughly inspecting the existing shingle roof. Check for any signs of damage, such as loose or missing shingles, leaks, or structural issues. Address any problems before proceeding with the installation. Clean the roof surface to remove debris, dirt, and moss.

2. Install Furring Strips

Furring strips are thin, wooden strips installed over the shingles to create a level surface for the tin roofing. These strips provide a gap between the shingles and the tin, allowing for proper ventilation and preventing moisture buildup. Attach the furring strips vertically, securing them to the roof’s rafters with screws.

3. Apply a Moisture Barrier

To protect your home from water infiltration, apply a moisture barrier, such as roofing felt or synthetic underlayment, over the furring strips. This layer helps prevent any water that gets under the tin roof from reaching the shingles and causing damage.

4. Install the Tin Roofing Panels

Begin installing the tin roofing panels at the bottom edge of the roof, working your way up. Overlap the panels according to the manufacturer’s recommendations to ensure a watertight seal. Secure the panels to the furring strips using appropriate screws, ensuring they are properly aligned and fastened.

5. Install Ridge Caps and Flashing

Ridge caps are installed along the roof’s peak to cover the joints where the tin panels meet. Flashing is used to seal areas where the roof meets walls, chimneys, or other structures. These components are essential for preventing water leaks and ensuring a watertight roof.

6. Check for Proper Ventilation

After installing the tin roof, ensure that your roof’s ventilation system is functioning correctly. Proper ventilation is crucial for preventing moisture buildup and maintaining the longevity of your roof.

7. Final Inspection

Once the installation is complete, conduct a final inspection to ensure that everything is in place and securely fastened. Check for any gaps, loose screws, or other issues that could compromise the roof’s integrity.

Maintenance Tips for Tin Roofs Over Shingles

1. Regular Inspections: Schedule regular inspections to check for signs of wear, such as rust, loose screws, or damaged panels. Address any issues promptly to prevent further damage.
2. Clean the Roof: Keep your tin roof clean by removing debris, leaves, and dirt. This helps prevent water buildup and reduces the risk of rust.
3. Check Ventilation: Ensure that your roof’s ventilation system remains functional to prevent moisture buildup, which can lead to mold and rot.
4. Address Rust: If you notice any rust spots, treat them immediately to prevent the corrosion from spreading. This may involve using a rust converter or applying a new coat of paint.
5. Monitor Insulation: Periodically check the insulation between the tin roof and the shingles to ensure it remains effective. Replace or add insulation as needed to maintain energy efficiency.

Conclusion

Putting tin roof over shingles is a practical and cost-effective solution that offers numerous benefits, including enhanced durability, improved energy efficiency, and aesthetic appeal. However, it’s essential to consider factors such as local building codes, the condition of the existing shingles, weight considerations, and proper ventilation before embarking on this project. By following the proper installation steps and maintaining your tin roof, you can enjoy a long-lasting and reliable roofing solution that protects your home for years to come.