Drip edge is a specialized edge metal that helps protect the perimeter of your roof. The various designs of drip edge are designed to use the properties of gravity and water tension to shield your vulnerable areas along the roof’s perimeter from water intrusion. While this is one of the least costly components of a roof system, it has a tremendous impact on your roof’s ability to shed water. The function of edge metals is to allow water to fall away from the fascia, and to keep wind driven rains from blowing between your shingles and your fascia, causing costly wood rot. In addition to the benefits of repelling water from weak points at the roofs edge, it also adds to the roofs curb appeal by giving homeowners the ability to color match the outline of their roof system against the fascia boards.
- Water Management: By directing water into gutters and away from the roof edge, it prevents water damage to the fascia, soffit, and underlying roof deck.
- Structural Protection: It helps protect the roofing system from wind-driven rain and moisture intrusion.
- Aesthetic Finishing: It gives the roof a clean, finished look and hides the rough edges of the roof decking.
Location of Drip Edge
Drip edges are installed along:
- Eaves: The lower edges of the roof where water naturally flows off. (Where the gutters go!)
- Rakes: The sloped edges of a gable roof that run from the peak to the eaves. (This is the part that slopes UP). This installation prevents wind-driven rain from getting underneath the shingles.
Styles of Drip Edge/Edge Metals
- Type C (L-shaped) Drip Edge:
- Description: The most commonly used style, it forms an “L” shape and is installed along the eaves. The horizontal flange lays under the shingles, while the vertical flange sits over the fascia.
- Function: Protects the edge of the roof by directing water into the gutter and preventing it from seeping into the underlying materials.
- Location: Typically installed along the eaves and rake edges of the roof.
- Cost: Generally costs around $1-2 per linear foot, depending on the material used (e.g., aluminum, galvanized steel, copper).
- Code: Required by most building codes, including the International Residential Code (IRC) R905.2.8.5, which mandates that drip edges be installed at the eaves and rake edges.
- Type D (T-shaped) Drip Edge:
- Description: The “T” shape features a larger flange that extends outward, with a small lip that directs water away from the roof’s edge.
- Function: Provides enhanced protection by creating a wider overhang, directing water further away from the fascia and roof structure.
- Location: Typically used in areas with heavy rain or where extra water drainage is needed, such as low-slope roofs.
- Cost: Slightly more expensive than Type C, usually around $1.50-3 per linear foot depending on material.
- Code: Also covered under IRC guidelines, with specific requirements for installation and material to prevent water intrusion.
- Type F (Gutter Apron) Drip Edge:
- Description: This style has an extended drip leg that allows it to be installed over existing gutters. It’s often referred to as a “gutter apron” because it helps channel water directly into the gutters.
- Function: Ideal for roofs with existing gutter systems, it ensures water flows properly into the gutter without damaging the roof edge or fascia.
- Location: Primarily used on roofs where gutters are present.
- Cost: Similar to Type C, usually ranging from $1-2 per linear foot.
- Code: Installation must follow the same guidelines as other drip edges, ensuring it is securely fastened and extends beyond the roof deck as outlined in the IRC.
Cost of Drip Edge
The cost of drip edge varies based on the material:
- Aluminum: The most common material, usually priced around $1-2 per linear foot.
- Galvanized Steel: Slightly more expensive, priced at around $1.50-2.50 per linear foot. It’s more durable and resistant to rust.
- Copper: A premium option that can cost $5-10 per linear foot, known for its durability and aesthetic appeal.
Code Expectations
Most building codes, including the IRC, require drip edges to be installed in roofing systems:
- IRC Section R905.2.8.5: This section mandates that drip edge flashing be installed at the eaves and rakes of asphalt shingle roofs. The code specifies that the drip edge must extend a minimum of ¼ inch below the roof decking and be fastened to the deck at intervals no greater than 12 inches.
- Overlap Requirements: Drip edge sections should overlap each other by at least 2 inches to prevent water intrusion.
Proper installation of drip edges is essential for meeting building codes, ensuring the longevity of the roof, and protecting the underlying structure from water damage. Failing to install drip edges, or using the wrong type, can result in roof leaks, damage to the fascia, expensive wood repairs, and create a need to paint your fascia more often than necessary.
Conclusion
Drip edges are a vital component of any roofing system, with different styles serving specific functions depending on the roof design and water management needs. Whether it’s the basic Type C for standard protection, the extended Type D (our top choice for installation at rakes) for more coverage, or the Type F for integration with gutters, understanding the correct use and code requirements for drip edge helps ensure a durable and compliant roofing system. By investing in the right drip edge and ensuring proper installation, homeowners can significantly increase the lifespan of their roofs and prevent costly water damage.