Understanding the Role of Drip Edge in Protecting Coastal Roofs

If you live in Norwell, Hull, or Cohasset, your roof is constantly defending against more than just rain. Coastal Massachusetts homes face salt air, driving wind, heavy snow, and occasional hurricane-force gusts. While shingles, flashing, and underlayment get a lot of attention, there’s one often-overlooked component that plays a huge role in roof protection: the drip edge.

This small metal strip at the edges of your roof might seem minor, but without it, your roof’s lifespan — and your home’s defenses — can drop dramatically.

What Is a Drip Edge?

A drip edge is a thin, L-shaped piece of metal installed along the eaves and rakes of your roof. Its purpose is to guide water away from the fascia and into the gutters, preventing water damage and rot.

Types of Drip Edge:

• Type C: A simple L-shape, common in inland homes but less effective in high-wind zones.
• Type 😨 Also called “T-style,” with a wider overhang for better water channeling — great for Hull’s ocean winds.
• Type F: Extended flange for retrofitting older roofs in places like Cohasset where historical homes may not have had drip edge originally.

Why Drip Edge Is Essential in Coastal Massachusetts

Stops Wind-Driven Rain

In Hull, storms can push rain upward under shingles. The drip edge helps block this water entry at the roof’s edges.

Protects Fascia Boards

Without drip edge, water can soak into the wooden fascia, leading to rot, peeling paint, and pest infestations in Norwell homes.

Keeps Gutters Performing Well

A properly installed drip edge directs water straight into the gutters, preventing overflow and staining.

Prevents Ice Dams

In Cohasset winters, ice dams can back water up under shingles — drip edge with ice & water shield beneath helps stop infiltration.

Building Code Requirements

Massachusetts state building code requires drip edge on all new roofs — but in older homes (especially historical properties in Cohasset), drip edge may be missing entirely. Retrofitting during a re-roof is essential.

Best Materials for Coastal Environments

Aluminum Drip Edge: Affordable and corrosion-resistant if coated, but can pit in direct salt exposure.

• Galvanized Steel: Strong, but prone to rust without marine-grade coating.
• Stainless Steel: Ideal for Hull’s direct salt spray zones — lasts decades with minimal wear.
• Copper: Durable and beautiful, often used on Cohasset’s historic homes for aesthetics and longevity.

Installation Best Practices

• Install under the underlayment at the eaves but over it at the rakes.
• Overlap each section by at least 2 inches.
• Use corrosion-resistant fasteners (stainless steel or hot-dipped galvanized).
• Seal corners and joints to prevent water entry during nor’easters.

Signs Your Drip Edge Needs Replacement

• Rust or corrosion
• Warping or bending away from the fascia
• Water stains on fascia or siding below
• Ice dams forming near eaves despite adequate attic ventilation

Cost of Upgrading to Coastal-Grade Drip Edge

• Standard aluminum: $2–$3 per linear foot
• Stainless steel or copper: $5–$10 per linear foot
  Given the long-term protection, this is a relatively low-cost upgrade during a roof replacement in Norwell, Hull, or Cohasset.

Final Word for South Shore Homeowners

Your drip edge is one of the smallest but most important parts of your roofing system — especially in coastal towns. Investing in the right material and proper installation means better water management, less fascia rot, and longer roof life. In a climate as challenging as ours, it’s not optional — it’s essential.