What is gable trim on a metal roof?
Short answer. Gable trim, also called rake trim, is the formed metal piece that runs along the sloped edges of a metal roof, covering the cut edge of the outermost panel and the top of the rake board. Because gable edges take some of the strongest wind uplift on a roof, the trim must be fastened closely into both the panel and the rake so it cannot peel back.
What it does
- Covers the raw panel edge and keeps rain from running under it.
- Protects the rake board and deck edge.
- Locks the edge panel down against wind.
- Finishes the look of the gable.
How it attaches
Most gable trims have a top flange that laps over the last panel rib or seam and a vertical face that runs down over the rake board. Fasteners go through the top into the panel rib and through the face into the board, at the spacing the manufacturer specifies. Some systems use a cleat along the rake that the trim hooks onto, which hides fasteners and adds uplift resistance.
Profiles
- Standard rake trim for exposed-fastener panels.
- Hemmed or cleated rake for standing seam.
- Channel-based systems where the panel edge slides into a J-channel or Z-closure before the trim goes on.
Common mistakes
- Fasteners spaced too far apart, so wind lifts the trim.
- Laps at trim joints running the wrong way.
- No butyl or sealant at the top flange.
- A face too short to cover the rake board, leaving wood exposed.
- No end cap at the ridge, leaving an open hollow.
In Georgia storms
Thunderstorm gusts hit gable edges hardest. Loose rake trim often shows first as rattling or a lifted corner, so check it after any strong wind and photograph anything that moved.
See wind damage to roofs in Georgia and metal roofing in Georgia.