Allowable Holes for Trus Joist Products (Poster)

TJI ® Joists. Minimum distance from Table B 1½" round holes may be cut anywhere in web outside of hatched zone if . they are located 3" away horizontally (edge-to-edge) from a larger hole. 2 x D. 1. minimum (applies to all holes except knockouts) Closely grouped round holes are . permitted if the group perimeter meets requirements for round ...