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installing metal roof over asphalt shingles

Installing Metal Roof Over Asphalt Shingles A Comprehensive Guide

Installing a metal roof over existing asphalt shingles can be a practical and efficient choice for homeowners looking to upgrade their roofing system. This method not only saves time and labor but also adds an extra layer of protection and insulation to your home. In this article, we will explore the benefits, considerations, and steps involved in this installation process.

Benefits of Metal Roofing

One of the primary advantages of metal roofing is its durability. Metal roofs can last 50 years or more, compared to the 20-30 years typically associated with asphalt shingles. They are resistant to harsh weather conditions, including high winds, heavy rain, and snow accumulation. Additionally, metal roofs are fire-resistant and can reflect solar heat, which can help in lowering energy costs, especially during hot summer months.

Installing a metal roof over asphalt shingles also reduces waste. Disposing of old shingles can contribute significantly to landfill mass, but by choosing to install directly over them, you minimize your environmental impact.

Considerations Before Installation

Before beginning the installation process, there are several important factors to consider. First, check local building codes and regulations, as some areas may have restrictions on layering materials. Ensure that your existing roof structure can support the added weight of a metal roof. Generally, metal roofing is lightweight, but it’s always wise to consult a professional to assess your roof’s structural integrity.

You will also need to evaluate the condition of your existing shingles. If the shingles are severely damaged or sagging, it may be necessary to repair or replace them before proceeding with the metal installation.

Installation Steps

installing metal roof over asphalt shingles

1. Preparation Start by removing any debris from your roof. Ensure that the surface is clean and dry. If there are any exposed nails or sharp edges, they should be covered or smoothed out to prevent damage to the new roofing material.

2. Underlayment It’s a good practice to install an underlayment for added moisture protection. A synthetic underlayment is typically preferred as it offers better durability and water resistance compared to felt paper.

3. Furring Strips Install furring strips perpendicular to the rafters if additional airspace is needed. This will help promote ventilation and can enhance the roof’s overall longevity.

4. Metal Panels Begin installing the metal panels from the bottom of the roof to the top, ensuring they overlap properly according to the manufacturer’s specifications. Secure each panel with screws, being careful not to over-tighten, as this can cause damage.

5. Trim and Flashing Once all panels are installed, add trim and flashing around edges, chimneys, and vents to ensure a watertight seal.

6. Final Inspections Conduct a thorough inspection to ensure everything is properly secured and sealed. Check for any gaps or areas where water could penetrate.

Conclusion

Installing a metal roof over asphalt shingles can be a highly beneficial approach for many homeowners. With its long lifespan, environmental advantages, and added insulation, metal roofing is an investment worth considering. By following the necessary steps and precautions, you can achieve a durable and aesthetically pleasing roof that enhances your home’s value and protection. Whether you choose to tackle this project yourself or hire professionals, the results will be a beautiful metal roof that stands the test of time.

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