Raised ranch house, truss roof, floor joists are 2X8 16" on center with a span of 12 feet. We hated the cut up rooms in the raised ranch, so we took down living room and dining room walls, to create more of a great room look (we installed new hardwood floors throughout the entire area). All went well..but now we feel a bounce in the floors, and even a constant (although minor) vibration in the entire 'upper' floor of the raised ranch. I feel the vibration even when no one is walking around.
The walls we removed were not bearing walls. Why would we now feel this annoying vibration/bounce?
THANKS, in advance, for any ideas!