How do I avoid the rounded-face sheet metal slant (denting the duct)

Plain-English answer

You are setting a Pittsburgh seam lock using a standard claw hammer you found in your automotive toolbox. Every time you strike the metal lip, the rounded face of the hammer leaves deep, ugly circular dimples that distort the flat sheet casing panel.

Carpentry framing hammers have a crowned, checkered face that will easily tear thin sheet metal. Always use a dedicated sheet metal duct hammer (tinner's hammer). A tinner's hammer features a perfectly flat, square face for striking seams flat, and a. The likely recovery is to check the tool setup, correct the prep or technique if it is within your assignment, and bring the journeyman or foreman clean information before the work creates rework overhead.

Ask Foreman

Verify before acting

Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Related questions in this category