I'm an engineer looking for practical advice on making modifications to existing 2x4 open web floor trusses. The trusses that are spaning the entire 25 ft. width of the basement garage in an existing home are sagging and need reinforcing. The floor system is filled with mechanicals and there's no easy way to modify or replace the trusses. The obvious solution is to put a support beam and posts down the middle of the garage, but this changes the stresses in the truss members and the plate connections. I can’t turn to the manufacturer because the home was built in the 80's, and there's no to find out who made the trusses. I’d love to hear from anyone that has found a creative way to solve this kind of problem.