asphalt shingles over wood shingles

Installing Asphalt Shingles Over Wood Shingles A Comprehensive Guide

Asphalt shingles are one of the most popular roofing materials in North America. They are known for their affordability, durability, and ease of installation. An increasing number of homeowners are considering the option of installing asphalt shingles directly over existing wood shingles. This method can save time, labor, and disposal costs associated with removing the old roofing. However, it also comes with its own set of considerations. In this article, we will explore the advantages and disadvantages of installing asphalt shingles over wood shingles, as well as provide a step-by-step guide to ensure a successful installation.

Advantages of Installing Asphalt Shingles Over Wood Shingles

1. Cost Efficiency One of the primary reasons homeowners choose to overlay asphalt shingles is the cost savings. Removing wood shingles can be labor-intensive and may incur additional disposal fees. By installing new shingles over the old, you can save money on labor and disposal costs.

2. Time Savings Skipping the removal process means the new shingles can be installed much faster. Homeowners can have their roofs completed in a shorter time frame, minimizing disruption to their daily lives.

3. Increased Insulation Layering shingles can add an extra layer of insulation, which may enhance energy efficiency. This can result in lower heating and cooling costs over time.

4. Improved Aesthetics If the wood shingles are in relatively good condition, installing asphalt shingles over them can cover up imperfections and provide a fresh, updated look to the home.

Disadvantages and Considerations

1. Increased Weight Adding another layer of roofing increases the weight burden on your home’s structure. Before proceeding, it’s crucial to consult with a structural engineer to ensure your roof can handle the additional load.

2. Limited Lifespan The lifespan of asphalt shingles may be reduced when they are installed over existing wood shingles due to potential moisture issues that can arise between the two layers. Wood shingles may trap moisture, leading to rot and mold, which can eventually impact the new shingles.

3. Lack of Warranty Some manufacturers do not honor warranties for shingles installed over existing roofing. Check with the shingle manufacturer to understand their policies before proceeding.

4. Ventilation Issues Proper ventilation is critical for a roofing system to function effectively. If the wood shingles are not adequately ventilated, the new asphalt shingles may also suffer from heat and moisture buildup.

Step-by-Step Installation Guide

1. Inspection Before installing, inspect the existing wood shingles for damage. If any section is rotting, cracked, or severely damaged, repair or replace those areas as necessary.

2. Clean the Surface Remove any debris, such as leaves or branches, from the roof. Cleaning the surface creates an ideal foundation for the new shingles to adhere to.

3. Check Flashing and Vents Ensure that the roof flashing and vents are in good condition. Replace any damaged flashing to prevent leaks.

4. Install Underlayment Lay down a waterproof underlayment over the wood shingles. This adds an extra layer of protection against moisture. Make sure to overlap the seams in accordance with the manufacturer’s specifications.

5. Lay the Asphalt Shingles Begin installing the asphalt shingles at the bottom edge of the roof, following the manufacturer’s instructions. Ensure that the shingles are staggered properly to enhance water runoff and prevent leaks.

6. Finishing Touches After installation, take the time to check the roof for any exposed nails or loose shingles. Make necessary adjustments to ensure everything is securely in place.

7. Final Inspection Once the installation is complete, conduct a thorough inspection to ensure that all components are functioning correctly and that there are no potential issues.

Conclusion

Installing asphalt shingles over wood shingles can be a practical solution for homeowners looking to update their roofing without the hassles of a complete tear-off. While there are advantages, such as cost and time savings, it is essential to consider the potential downsides, including structural weight and longevity issues. To ensure a successful installation, thorough preparation and adherence to best practices are vital. Always consult with professionals if you have any doubts about the process, as a well-installed roof is crucial for protecting your home from the elements for years to come.