We do this all the time. We have a brief safety speech and, of course, they are supervised. Our tallest is 12'-0". We have used ladders for sets as well. It is choreographed just like any other set piece. We have a general waver for all students in each production that lists scene shop conditions and expectations, and a small section about working at heights (ladders and catwalk). That being said, I always directly ask students if they are comfortable working from a ladder before asking them to use one. I inspect our ladders before each use, and annually as part of my preventative maintenance program.
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