Hi all, I have built an over garage door storage rack using 2x4's, 2x10's, Unistrut and threaded rod. It's holding up really well but I notice after being up for a couple months that the 2x10s laying across the struts are starting to bow in the middle. I was wondering if I can just add another run of Unistrut in the middle BUT didn't know about tying in to the beam going across the middle of the ceiling. This beam (I beam??) only spans the garage. The inside of the downstairs has another beam going across the ceiling but isn't the same piece. See my pictures here: http://imgur.com/a/gXpEi (The garage door tracks are kinda in the way but you'll notice the 2x4s screwed into the ceiling with threaded rod going to unistrut holding 2x10s and 2x4 and a sheet of plywood). This is an attached garage with a second story above, 2x10 joists on 16". Thanks.