Wood I-joists have perforated knockouts for plumbing pipes or electrical wiring, or another option is to attach the pipes to the bottom flange in situations where the ceiling will not be finished.
The flange of a wood I-joist must never be cut.
Wood I-joists have perforated knockouts for plumbing pipes or electrical wiring, or another option is to attach the pipes to the bottom flange in situations where the ceiling will not be finished.
The flange of a wood I-joist must never be cut.
