I-Joist floor system are becoming more common in today’s home building. They can be manufactured in different lengths and when installed correctly can be a great floor system. The center portion of the joist can be cut most anywhere to allow for plumbing pipes, electrical wires, etc., however, the upper and lower rib of the joist cannot be disturbed. Often times during inspections we find damage joist where plumbers have cut the upper rib to allow plumbing pipes to enter the structure. This damage should be repaired per the manufacture of the I-joist to prevent settlement or possible collapse of the floor system.