In my son's bedroom there is a raised spot in the floor along one of the joists. I went into the crawlspace with a level and that joist is bowed up about 3/4" to 1" compared to the other joists on either side of it.
Best I can tell, this may have been like this when the subfloor went down as the subfloor is well attached to the joists in this area. Also, the blocking isn't flush with the bottom of the crowned joist where it peaks. Everything else around this one joist looks okay and I'm not noticing any signs of settling in the drywall inside or the brick outside.
I noticed the raised spot shortly after we bought the house a few years ago, but recent furniture placement has made it incredibly obvious. I don't think it has gotten any worse since then. Is there anything else I need to look for that might indicate a serious problem?
If the problem is just this one joist being bowed up as I suspect, what are my options to remedy the situation? Is there any way that I can pull it down from below?
EDIT
After thinking about this some, would it be possible to attach a piece of steel angle or t bar to the crowned joist with lag bolts and use the joists on either side to pull it down?
Best Answer
Pretty simple to fix if you have access from underneath. I would start by adding a couple of 2x4 with screws underneath several of the joists on each side of the problem joist.
Next, cut the joist vertically at the location where the bump is. This will let the joist sag down on top of the 2x4 braces that you added.
Finally add a sister next to the joist that you cut. The simplest thing to do is to use a piece of wood of equivalent size as the existing joist. It is glued onto the existing joist with construction adhesive and then bolted together securely with closely-spaced bolts.