engineered i joists

Rod M

I am completing a basement reno for a friend. The floor joists are engineered i-joists 2X3 with OSB. The only option for the ceiling in the basement is drywall ( the windows are too close to ceiling for suspended tiles) Anyhow, the center beam in the house is terrible. Along the teleposts, there are severe peaks ( up to 1 inch; peaks and valleys on a 40 foot run). The exterior walls are fine, only peaks and valleys along center beam. Without adjusting the telepost to level ( it would cause major issues with upstairs if different stresses are put on walls, I would imagine major cracks at the very least). is there an acceptable way to sister a 2X3 onto the side of the bottom plate of the I-joist to basically level the ceiling? I am worried that the small 2X3 will not handle the twist of addiing lumber to the side of it and the weight of the drywall on that. Thoughts?

gregzoll

Pictures really help.

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joecaption

I think I would be spending the time to figure out why there so high before covering up the ceiling making it impossible to fix later.

I'd go up stairs and use a 6" level on that floor to check a few things out.
(I'd really use my self leveling lazer level, but not likly your going to have one laying around)

I've raised and lower many an older house then the one your working on with plaster on the wall and had no damage. Just have to lower it a little at a time.