Drip Edge Over Or Under Felt

Drip Edge: Over or Under Felt? The Definitive Guide for a Leak-Proof Roof

Choosing the right installation method for your drip edge is crucial for a long-lasting, leak-proof roof. This seemingly small detail can make a big difference in protecting your home from costly water damage. This guide clarifies the debate of installing drip edge over or under felt, helping you make an informed decision for your next roofing project.

Meta Description: Learn the correct way to install drip edge on your roof – over or under felt? This comprehensive guide explains the best practices for a leak-free roof, covering installation techniques and potential problems.

Understanding the Role of Drip Edge

Drip edge, a thin strip of metal usually made of aluminum or galvanized steel, is an essential component of any roofing system. Its primary function is to direct water away from the vulnerable edges of your roof and prevent it from seeping underneath the shingles or into the fascia board. This protects the underlayment, sheathing, and ultimately, the interior of your house. Proper installation is key to maximizing its effectiveness. Common types include:

• Standard Drip Edge: The most common type, offering basic water redirection.
• Ice and Water Shield Drip Edge: Specifically designed to help prevent ice dams.

The Great Debate: Over or Under Felt?

The question of whether to install drip edge over or under the felt underlayment (like felt paper or synthetic underlayment) is a frequent point of confusion. The correct answer, based on best practices and building codes, is generally over the felt.

Why Install Drip Edge Over Felt?

Installing drip edge over the felt offers several significant advantages:

• Protection from Wind Damage: Having the drip edge on top of the felt secures it, preventing wind from lifting or damaging the underlayment. This is crucial, especially in areas prone to strong winds.
• Better Water Shedding: When installed correctly, the drip edge creates a clean, continuous barrier to direct water away from the roof edges. Installing it over the underlayment creates a smoother, more effective surface for water run-off.
• Simplified Installation: Installing it over the felt often makes the process cleaner and more straightforward, as it doesn't require precise placement under the underlayment.
• Preventing Damage to Felt: The drip edge acts as a protective barrier against damage to the felt during shingle installation.

Potential Issues with Installing Drip Edge Under Felt

While some contractors may advocate for installing drip edge under felt, this method generally presents more problems than advantages:

• Increased Risk of Water Intrusion: There’s a greater risk of water seeping between the felt and the drip edge, particularly if the installation isn't perfectly executed.
• Difficult Installation: Precise placement under the felt can be tricky, potentially leading to uneven installation and reduced effectiveness.
• Compromised Structural Integrity: Improper installation can compromise the overall structural integrity of the roofing system.

Best Practices for Drip Edge Installation

Regardless of the type of drip edge you choose, proper installation is crucial for optimal performance. Here’s a summary of best practices:

• Proper Overlap: Ensure adequate overlap between adjacent pieces of drip edge to prevent water leakage.
• Secure Fastening: Use appropriate fasteners to securely attach the drip edge to the roof sheathing, ensuring it remains firmly in place.
• Continuous Run: Maintain a continuous run of drip edge along the entire roof perimeter for consistent water deflection.
• Careful Consideration of Flashing: Properly integrate the drip edge with other flashing components of your roof for a complete watertight system.

Conclusion: Prioritize a Leak-Free Roof

Choosing to install drip edge over the felt is the recommended approach for a robust and long-lasting roofing system. This method provides superior protection against water damage and simplifies the installation process. By following best practices and using high-quality materials, you can significantly increase the lifespan and durability of your roof and protect your home from costly water damage. Remember to always consult with a qualified roofing professional for any complex roofing projects.