putting metal roof over asphalt shingles

Putting Metal Roof Over Asphalt Shingles A Comprehensive Guide

Metal roofing has become an increasingly popular choice for homeowners looking for durability, energy efficiency, and aesthetic appeal. One common question that arises is whether it is possible to install a metal roof over existing asphalt shingles. This article will explore the benefits and considerations of such an installation, guiding homeowners through the process.

Benefits of Installing Metal Roof Over Asphalt Shingles

1. Cost-Effective Solution Installing a metal roof over existing asphalt shingles can save on labor and disposal costs associated with tearing off old shingles. This is particularly appealing for those on a budget who still want the advantages of a metal roof.

2. Time Savings Tear-off and disposal of asphalt shingles can be time-consuming. By placing metal roofing over asphalt shingles, you can significantly reduce the time needed for installation, allowing you to enjoy your new roof sooner.

3. Increased Energy Efficiency Metal roofs reflect solar radiant heat, which can reduce cooling costs in hot climates. By keeping your existing asphalt shingles in place, the roof can act as an additional layer of insulation, improving energy efficiency even further.

4. Enhanced Structural Integrity Metal roofs are known for their durability and resistance to extreme weather conditions. Installing a second layer of roofing can add structural strength, providing an extra layer of protection against wind, rain, and snow.

5. Improved Aesthetic Appeal Metal roofs come in a variety of styles and colors, allowing homeowners to enhance the curb appeal of their homes. By covering worn-out asphalt shingles, you can give your home a fresh, modern look.

Considerations Before Installation

While there are many benefits, it is essential to consider a few factors before deciding to install a metal roof over existing asphalt shingles

1. Local Building Codes Some locales have regulations regarding the number of roofing layers allowed. Before proceeding, check with your local building department to ensure that your plan complies with local codes.

2. Weight Concerns While metal roofs are generally lightweight, the combined weight of multiple roofing layers should be considered. Make sure your home’s structure can handle the additional weight without compromising safety.

3. Underlayment and Ventilation Proper underlayment is crucial for a successful metal roof installation. Additionally, ensuring adequate ventilation beneath the roof system is vital for prolonging the roof’s lifespan and preventing moisture buildup, which can lead to mold and decay.

4. Warranty Issues Some manufacturers may void the warranty if their metal roofing is installed over existing shingles. Always check the warranty terms before installation to avoid future complications.

5. Conditions of Existing Shingles If the existing asphalt shingles are severely damaged, warped, or embedded with debris, it’s advisable to remove them before installing the metal roof. A solid and clean surface is imperative for ensuring the longevity and performance of the new roof.

Steps for Installation

For homeowners considering installing a metal roof over asphalt shingles, here are some general steps to follow

1. Inspection Begin by thoroughly inspecting the existing shingles for damage or signs of wear. Address any necessary repairs before proceeding.

2. Preparation Clear off any debris, and ensure the roof deck is clean and dry. It may also be beneficial to install a new layer of underlayment for extra protection.

3. Installation of Furring Strips To promote air circulation and provide a secure installation surface, consider adding furring strips (horizontal wooden strips) across the roof.

4. Metal Roofing Installation Follow manufacturer guidelines for installing the metal roofing panels, ensuring they are secured properly and overlapped correctly to prevent leaks.

5. Finishing Touches Complete the installation by adding necessary trim pieces, flashing, and ensuring all areas are sealed against water ingress.

Conclusion

Installing a metal roof over asphalt shingles can offer numerous benefits, from cost savings to enhanced energy efficiency. However, it’s essential to consider local building codes, the condition of the existing shingles, and the weight of the added layer. With proper planning and execution, homeowners can enjoy the longevity and durability of a metal roof, providing peace of mind and protection for years to come.