Do metal roofs need drip edge?
Short answer. Yes. A metal roof needs edge metal at the eaves and rakes, usually called eave trim or drip edge on metal systems, to carry water past the fascia into the gutter, secure the panel edges against wind, and close off the deck edge. Most metal panel makers include specific eave and rake trims in their systems, and leaving them out invites rot and wind damage.
What edge trim does on a metal roof
- Drainage: directs runoff off the panel ends and into the gutter instead of down the fascia.
- Wind resistance: on standing seam roofs, panels hook onto a continuous cleat or eave trim, which locks the bottom edge down.
- Closure: together with foam closures, it seals the gaps under ribbed panels against wind-driven rain, insects and birds.
- Finish: a clean, straight edge that frames the roof.
How it goes on
Eave trim is installed first along the deck edge, with underlayment lapped over it so water on the underlayment drains onto the metal. Panels then extend past the trim by the overhang the manufacturer specifies. Rake trim goes on last, covering the panel edges along the gables.
Exposed fastener vs standing seam
Ribbed exposed fastener roofs typically use a simple eave trim with closure strips under the panels. Standing seam roofs use a cleat system so the panel ends are hemmed and locked, with no exposed fasteners at the edge.
Signs it is missing or failing
- Water stains or soft spots on the fascia below the roof edge.
- Panel ends lifting or rattling in wind.
- Wasps or birds nesting under the panel ends.
Adding trim to an existing metal roof often means loosening panels, so it is best done right the first time. See drip edge explained and metal roofing in Georgia.