Originally Posted By: jmichalski
This post was automatically imported from our archived forum.
150 year old house. Many of the floor borads (random width pine, tongue and groove) are loose and have some bounce to them.
The effect is alarmingly amplified on the second floor where the client (a 105 pound woman) jumped up and down a little and the whole room shook. And I mean a LOT!. There is also a noticable sag in the center of the room.
I am no structural expert, but it seems as if the floor joists are sagging (possibly undersized?) in the center. Am I overlooking any other possible causes for these problems?
I'd like to be sure before I tell this woman that if she wants to fix it she probably has to tke up her floor boards...
If it helps any, a peak in the very small crawlspace revealed that the rafters and joists were 2x4 members (actually a little thicker than 2"). I can't imagine the floor joists are 2x4, but I guess anything is possible.