I agree with AGH this is the best design.If your going straight across it will sag over time.NickOriginally Posted by AGHRMatt:
On an 8-foot span, I think you'd get some sagging. However, if this is a doorway, you could "arch" the span by putting a parabolic support underneath which puts them into compression at the ends and better supports the center. You'd have to screw the ends of the 1x2's into the end pier supports.