I have a 4x6 spanning about an 18' distance. This will eventually support the edge of a lightweight polycarb panel.
I would like to raise the height of this beam by attaching a 4x4 on top of it. Question is, will the added weight cause a potential for sag? Or if I secure it with 6" lag bolts every four feet or so across the top will it actually add more rigidity?
I'm gonna hurl myself against the wall
because I'd rather feel bad than not feel anything at all