On Saturday, August 16, 2014 7:19:43 AM UTC-4, bob haller wrote:
this is definetely a project that requires a structural engineer, and a building permit.



trying to avoid either risks a disaster.....





just my 2 cent.......



every few years someone working on their home has one collapse..

Plus, unless you're doing something very unusual, why would you need 12 ft steel beams for "rooms and all"? Typically steel is only for special applications that require carrying the higher load than can be achieved with wood in the same space.