An 8-inch main pipe is suspended from a wood deck by an 8-inch ring and an adjustable threaded rod secured with two nuts and washers. The vertical rod connects to a 2.5-inch nailer with an SSB hanger provided by others. The assembly hangs two feet below the underside of the wood deck, adjacent to a 32-inch or 36-inch joist with 32 inches shown. A weight calculation block notes that an 8-inch water-filled pipe weighs 40.08 pounds per foot, totaling 942 pounds with fittings, temporary loads, and a 15-foot hanger spacing.
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