How To Install Drip Edge For Metal Roofing

November 29, 2025

2 min read

To install drip edge for metal roofing, you need to place the metal flashing along the edges of your roof before adding shingles or panels. Drip edge helps water run off correctly and stops it from getting under your roof. This small but important piece protects your home from leaks and water damage. Most homeowners hire pros for this job, but you can learn the basics. Metal roofing is growing in popularity, with about 1 in 10 homes now using it instead of asphalt shingles. According to industry data, metal roofing lasts between 40 to 80 years, which is much longer than most other roof types.

What Is Drip Edge and Why Do You Need It?

Drip edge is an L-shaped piece of metal that sits at the ends of your roof. It guides water down and away from your home’s wooden parts. Without it, water soaks into your fascia and decking, causing rot and damage.

The metal piece is usually made from aluminum or galvanized steel. It sits between your roof deck and your shingles or panels. According to RubyHome, metal roofing installation costs range from $4 to $40 per square foot, and proper drip edge installation is a key part of that work.

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How Do You Install Drip Edge on Metal Roofing?

First, measure your roof edges. You need enough drip edge to cover the entire perimeter. Cut pieces to size using tin snips.

Next, position the drip edge along the edge of your roof deck. It should stick out about 1 to 1.5 inches past your fascia. Nail it down every 12 inches using roofing nails. Make sure nails go through the top flange only, not the bottom.

At corners, cut the drip edge at a 45-degree angle and overlap the pieces. Use sealant where pieces meet to stop water from sneaking in.

What Order Should You Install Things in?

Install drip edge before your underlayment. The underlayment goes over the drip edge, not under it. Then add your metal panels or shingles.

This order stops water from backing up behind the drip edge. According to industry data, approximately 33% of homeowners need roof replacement due to leaking, so proper installation order is critical.

Installation Step	What to Do
Step 1	Measure edges and cut drip edge pieces
Step 2	Position drip edge on roof deck
Step 3	Nail down every 12 inches
Step 4	Seal corners with roofing sealant
Step 5	Install underlayment over drip edge

Common Mistakes to Avoid

Do not nail through the bottom flange. This creates holes for water to enter. Do not skip corners or edges. Every spot needs coverage.

Do not install drip edge after your shingles or panels. You must do it first. According to RubyHome, the average roof replacement costs $9,526, and mistakes during installation can lead to costly water damage that increases expenses. Always use galvanized or aluminum drip edge for metal roofing. Other metals rust and fail quickly.

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Talk with a local roof contractor to review your options and get a detailed estimate for your project.