I'm looking for some advice on what might be causing my floors to dip and hump. I live in a townhome and the edges of the first floor at the perimeter walls are 1-1.5 inches higher than the rest of the floor. We have had to shim any furniture that sits against these outside walls. There is also a VERY noticable hump in the floor about half way between the front and back of the house. Our basement ceiling is finished so it is not possible to take a look at the joists to see what they're doing without ripping the ceiling out. The house was built in 1976. It has me very concerned and it feels like they've gotten worse in the past few months. Can anyone offer a suggestion? Thank you!