Abstract: At approximately 2:30 p.m. on January 8, 1992, Employee #1 was installing a refrigeration unit at a remodeling job for Lucky Stores. As he was working, another subcontractor was installing insulation wallboard using an adhesive. A plumber, also a subcontractor, decided to solder a pipe for a water connection on the other side of the wall. The wallboard installer told the plumber that the fumes from the adhesive were explosive, but the plumber chose to ignore the warning and used a torch to solder the pipe, which caused an explosion. The explosion knocked out the wall directly behind Employee #1, who fell against a scale hanger on the refrigeration unit he was installing. Employee #1 sustained a laceration to his left ear that required eight stitches. No safety or health violations were issued to Employee #1's employer; however, the plumbing contractor was cited. No other employees were injured by the explosion.