How to "shorten" an Alliant Mill

[Walt]

Then scab on a 2 x 6 on each side. Another option might be to use steel.

^^This.

If you even need more room than between the joists. Perfectly acceptable practice if done well. Consider hiring a pro if you are concerned. (I believe this is referred to as "sistering" the joists.)

http://www.familyhandyman.com/floor...al-repairs-by-sistering-floor-joists/view-all

Walt