I’m in the design phase of adding a mezzanine to a condo unit. The unit is an old mill building, and has 15 foot high floor to ceiling clearance. I’m trying to add a mezzanine/loft space that’s roughly 12′ x 16′ but I’d like to do it with as thin a floor as possible so I can maximize the hieghts above and below the mezzanine.
I was hoping for the standard 30-40 psf loading, I guess 10 dead load (prob. overkill). The entire mezzanine would sit on 2×4 stud walls on all 4 sides. All the walls are interior walls, the unit is basically exterior brickwork on one side, I was figuring on framing out from it. The other 3 walls would just be 2×4 framed.
Would short steel I-beams be goofy? – or maybe 2×6 on 12″ spacing be the thinnest I could expect?