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Metal roofing panels, trim coil and aluminium soffit all cut best with a tool that shears the sheet rather than grinding it. Shears and snips leave a clean edge with the paint and metallic coating intact. Abrasive cut-off wheels throw hot particles that burn into the finish and leave a heat-damaged edge, and many panel makers say not to use them.
Most jobs need two tools: a powered shear or nibbler for long cuts along and across panels, and a set of aviation snips for notches, trim and short cuts. This guide compares the types by specification; it is not a hands-on product test.
Pros and cons describe each type from its specifications; this is not a hands-on product test. As an Amazon Associate we earn from qualifying purchases.
Best for: Long straight and curved cuts on corrugated and ribbed panels, trim coil and soffit. Check: Gauge rating on the listing (steel and aluminium) and whether it is impact-rated.
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Best for: Notches, trim, flashing, drip edge and short cuts. Check: A full set of three, compound leverage, and the steel gauge rating.
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Best for: Contractors cutting panels and trim all day. Check: Maximum steel gauge, swivel head, and the battery platform.
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Best for: Tight curves, cut-outs for vents and pipes, and ribbed profiles. Check: Gauge rating and how easy the punch and die are to replace.
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| Cut | Best tool | Second choice |
|---|---|---|
| Panel to length (across the ribs) | Power shear or drill shear | Nibbler |
| Rip along a panel | Power shear or drill shear | Aviation snips (short rips) |
| Vent and pipe cut-outs | Nibbler | Aviation snips |
| Trim, flashing and drip edge | Aviation snips | Drill shear |
| Trim coil and soffit panels | Drill shear or snips | Utility knife score-and-snap (aluminium only) |
Work out how many panels and trim pieces you will cut with the metal roof calculator, and the soffit and fascia runs with the soffit and fascia cost calculator.
Residential panels are commonly 29 or 26 gauge steel; the higher the number, the thinner the sheet. Agricultural and some standing-seam panels run 24 gauge or heavier. A tool rated for 18 gauge has plenty of margin for these, but always read the listing's rating for steel and for aluminium separately, and check it covers the panel's thickest point where two layers overlap at a lap.
A powered shear — a dedicated cordless shear or a shear attachment for a drill — for the long cuts, plus a set of aviation snips for trim and notches. Both shear the sheet and leave the coating intact.
Some panel makers allow a metal-cutting blade with the panel face down and filings swept up at once; others say not to. Check your panel maker's instructions. Never use an abrasive cut-off wheel on coated panels.
Yes, on panels within their rated gauge. Most residential panels are 29 or 26 gauge, which is well inside the rating of attachments sold for sheet metal. Run the drill at a steady speed and let the head do the cutting.
Red-handled snips cut curves to the left, green cut to the right, and yellow cut straight. Offset versions keep your hand above the sheet on long cuts.
Score and snap works on thin aluminium trim coil; a drill shear or snips handle soffit panels and thicker coil. Avoid abrasive wheels, which melt and smear aluminium.