If you're installing metal roofing or metal trim work, you've probably come across the term "break" — and if you're not a sheet metal pro, it can be confusing. Here's a plain-language breakdown of what metal roofing breaks are, the different types, and how to figure out which one your job actually needs.
What Is a Metal Roofing Break?
A "break" in sheet metal work refers to a bend — and a metal brake (sometimes spelled "break") is the tool used to make those bends. In roofing, breaks are used to fabricate the trim pieces that finish off a metal roof installation: the ridge caps, eave trim, rake trim, valley flashing, and drip edges that seal the edges and transitions of the roof.
Without properly formed trim pieces, even a well-installed metal roof panel system will leak at the edges and seams. The trim work is what makes a metal roof weather-tight.
Types of Metal Brakes
Hand Seamers
Handheld pliers-style tools used to make small, precise bends on the job site. Good for touch-up work and tight spots, but not practical for fabricating full trim lengths.
Cornice Brakes (Box and Pan Brakes)
A bench-top or portable brake with a straight clamping bar. Used to make simple straight bends across the full width of a sheet. The most common type for roofing trim fabrication.
Slip Roll Formers
Used to form curved or round shapes — like round downspout sections or curved flashing. Not used for standard straight trim work.
Standing Seam Brakes
Specialized brakes designed specifically to form standing seam panels. These have precise angle stops and profiles engineered for standing seam geometry.
Key Specs to Understand When Buying a Metal Brake
- Capacity (gauge): Brakes are rated for maximum metal thickness. A brake rated for 22-gauge steel may not handle 18-gauge. Know your material before you buy.
- Width: Standard roofing trim runs 10–14 feet in length. Make sure your brake can handle the sheet width you're working with.
- Bend angle: Most roofing applications need bends up to 135°. Confirm the brake's maximum bend angle.
- Portability: Job site work often requires a brake you can transport and set up on a roof or in a trailer. Look for folding or lightweight designs.
What Metal Thickness Are You Working With?
Most residential metal roofing panels run between 26-gauge and 29-gauge steel. Trim and flashing for agricultural or commercial applications may run heavier at 22–24 gauge. Always match your brake capacity to the heaviest material you plan to bend — trying to force a light-duty brake through heavy stock will damage the tool and produce poor bends.
Common Roofing Trim Profiles You Can Form with a Brake
- Eave / drip edge trim
- Rake trim (gable trim)
- Ridge cap
- Hip cap
- Z-flashing (for horizontal wall transitions)
- Valley flashing
- Pipe boot flashing
Shop Metal Roofing Tools
We carry a selection of metal roofing tools for contractors and serious DIYers. Browse our lineup of brakes, seamers, and accessories.