I've got a situation with a enclosed second floor area that occurs in the field of a roof. The roof is occupied space with a pedestal paver system. To accommodate the finish "floor" elevations I have some conditions with hi/low framing. The change in elevation is exactly 10". In a few areas the transitions in elevation occurs away from a column so I'm providing a "stacked" beam. I've gone back and forth between making the stacked upped beam a W10x15 vs a C10x15.3. I guess my concern is the bearing length I can get with the channel. Vulcraft recommends a minimum of 2-1/2" which I will get - but barely. Has anyone else come across this or feel strongly one way or another?
I've uploaded a quick detail. The channel will be stitch welded down to the supporting beam and I'm providing a stiffener at each joist.