Is anybody out there an engineer?
I am working with a structural engineer who has made some seriously over-designed changes to the structure of my house. I was initially surprised, but made the changes because I want the seal on my drawings, so I can submit them to L&I for approvals.
I am at the end of the revisions, and she tells me that "upon a third review, the roof framing of 2x12 @ 16" oc will not work."
2 story structure. It is a flat roof, 1/2":12". 3/4" T&G deck, 2" polyiso - mechanically fastened, single ply epdm - fully adhered. Ceiling attached.
Joists are hung from 2x12 ledgers, HY-20 epoxy connections @ 16" oc into 8" CMU - solid grouted with #4 rebar @ 16" oc and horizontal ladders every other course.
Live 20psf, Dead 10 psf, ceiling attached, L/240
The span is 15'-1", with 1.5" bearing - joist hangers.
Why won't this work?
I have looked at all kinds of span tables and every source, including
ICC-IRC says it should work.