cantivered 2nd story
cantivered 2nd story
(OP)
My client wants to cantilever the second story 2 to 4ft over the
first story at the front and back. I propose supporting it on cantilevered
WF beams at 10 or 12' oc. spanning from the center beam to the o/s walls. The beams support no load other than the roof and wall load of the 2nd story.
The floor joist do not cantilever but span from o/s walls to the center beam.
I wonder how to calculate the upward deflection of the cantilevered Wf's at mid span and even it is significant.
see also attached sketch
first story at the front and back. I propose supporting it on cantilevered
WF beams at 10 or 12' oc. spanning from the center beam to the o/s walls. The beams support no load other than the roof and wall load of the 2nd story.
The floor joist do not cantilever but span from o/s walls to the center beam.
I wonder how to calculate the upward deflection of the cantilevered Wf's at mid span and even it is significant.
see also attached sketch





RE: cantivered 2nd story
Mike McCann
MMC Engineering
RE: cantivered 2nd story
Is there a reason why the floor joists are not cantilevered?
Mike McCann
MMC Engineering
RE: cantivered 2nd story
Thanks Mike
The exterior walls are ICF blocks (6" of comcrete sandwiched between 2 pieces of 2" styrofoam) (incidently I hate them) I was concerned about supporting a concrete wall like that on plain 2x10 joists. and the posible problem with differential shrinkage. Now I'm thinking of cantilevering 16"deep open web pre-engineered wood truss joists and thinking that would work satisfactorily.
The onerhang varies from 2' in places to a max 4' in a short wall.