What to Know About Installing a Drip Edge on an Existing Roof

If you live somewhere with lots of rainy days, installing a drip edge can make a world of difference to your roof’s health. A drip edge keeps water from seeping under your roof and saturating it—an issue that could quickly lead to mold and rot. But you may wonder if it’s possible to add a drip edge on your home’s roof without totally replacing your roof. The good news is yes, you can. Here’s what you need to know about installing a drip edge on an existing roof. 

What Is a Drip Edge on a Roof?

A drip edge is a metal or plastic strip installed along the edges of a roof, designed to direct water away from the fascia and prevent it from seeping under the roofing materials. It sits beneath the shingles and extends slightly beyond the edge of the roof, allowing water to drip off and flow into the gutters. The drip edge helps protect the roof’s structure, including the fascia, soffits, and siding, from water damage and also helps prevent issues like wood rot and mold.

Pros and Cons of Installing Drip Edge on Existing Roof

If you’re on the fence about whether or not your home can benefit from a drip edge, consider these advantages and disadvantages.

Pros

• Prevents water damage: A drip edge helps direct water away from the fascia and roofline, reducing the risk of water damage to the underlying structure.

• Protects roofing materials: It helps prevent water from seeping under shingles, which can cause deterioration and leaks.

• Enhances roof longevity: A drip edge safeguards the fascia and soffits, prolonging the life of your roof and preventing costly repairs down the road.

• Improves aesthetic appeal: A drip edge provides a clean, finished look to the edges of your roof, adding to the overall curb appeal of your home.

• Helps with gutter function: It can also improve the function of gutters by ensuring water flows directly into them, reducing the risk of overflowing.

Cons 

• Additional cost: While relatively affordable, installing a drip edge still adds to the cost of roof repairs or replacements, ranging from $150 to $1,000.

• Potential for damage during installation: If not installed correctly, the process could cause damage to shingles or gutters, especially if they need to be adjusted or removed.

• Labor-intensive for DIYers: Installing a drip edge can be a challenging task for those without roofing experience, requiring precision to ensure proper water flow and alignment.

How to Install Drip Edge on Existing Roof

Even if you’re an avid DIYer, it’s always best to hire a roof repair professional near you for any roofing project. They have the skills and tools necessary to do the job properly—and safely. 

But if you’re an advanced DIYer and have prior experience working on a roof, start by inspecting the roof edges to ensure the fascia and soffits are in good condition. If you find any issues, you may need to pause here to make repairs before proceeding. Measure the length of the roof edges and cut the drip edge strips to fit.

Place the drip edge along the roof's edge, positioning the flange (the part that faces the fascia) to direct water away from the roof. Nail the drip edge in place, ensuring the nails are spaced about eight to 10 inches apart, but avoid puncturing the shingles or fascia.

If you're working on multiple roof edges, overlap the strips at the corners for a seamless fit. Check that the drip edge is aligned correctly and securely fastened. After installation, inspect the drip edge to ensure it directs water into the gutters properly and will protect your roof from water damage.