I want to build a roof over an existing deck, making it into a porch. 5’wide, 25′ deep; standard construction, 2×10 ledger bolted to the foundation, 4×10 beam, 23 2×8 x5′ joists. The beam sits right on the piers, which rise 12″ above grade; no posts. Problem: the beam is not plumb, has a very slight tilt – certainly no more than 3-5 degrees – outward. I worry that because of the angle, the weight of the roof, fully loaded with Chicago snow (I figure total weight – 3,000 lbs) is going to have a certain vector component outward, tending to tip the beam out and down. With such a small angle I can’t imagine it’s that much of an outward force, and it would be spread out over 23 joists holding the beam in – does anyone have a strong opinion on whether I need to plumb the beam before putting the roof on? Am I right in assuming the joists actually are helping hold the beam in, and not adding to the problem by pushing the beam out with their weight?