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Guide to Ladders for Plumbers and Mechanical Trades Plumbing and mechanical work happens in the awkward places on a job - between joists, above a ceiling grid, in a shaft with a wall on one side, or in a mechanical room where the floor is the only flat surface. The ladder that suits that work is not the same one a framing crew carries, and picking wrong shows up as an hour a day lost to repositioning. Rough-In: Extension and Short Stepladders Rough-in work is reach and repositioning. An extensi …