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Pump-jack scaffolding is ideal for sidewall work because you can erect the length you need with minimal hassle and adjust the infinitely variable plank height on the fly so you’re always working at a comfortable height.
For years, we’ve used steel pump jacks with poles made of doubled 2x4s. This economical combination gets the job done, but the jacks inevitably dent the poles. While cranking the jacks down, we often have to hit them with a hammer to bypass the dents, which can trigger short but scary free-falls.