A sheet metal mechanic died after he was knocked through a roof opening and fell to a concrete floor below. He was working for a plumbing and heating contractor that had been in business for 22 years. The victim was working on a job to fabricate and install a sheet metal cap over an opening on the flat roof of a manufacturing plant. The hole was made when an air conditioning unit was removed. The cap, made of sheet metal, was positioned near the hole where it was going to be installed. The victim was applying caulk to a raised curb bordering […]