uneven floors: which fix is better?
I posted in a thread a few weeks back about the subfloor on a room addition being higher than the subfloor of the existing house. The GC gave us a small discount and we agreed to fix it ourselves.
The room we need to fix is a 10x10 sitting area added on to the master bedroom on the 2nd floor. There's a 5' doorway connecting the two, and the existing bedroom has 1-year-old carpet. We want to carpet the sitting area, connecting it to the existing carpet. The problem is, the subfloor is about 1/4" higher in the addition. GC said it's because the joists on our existing house have dried and shrunk, and are thus shorter than the ones they used (this is true; we had to plane down some joists we sistered in another room).
Our options are:
1. Pull up the carpet and spread a liquid compound to build up the bedroom floor (not SLC, because I don't think that our bedroom floor is unlevel). This was the GC's recommendation. We'd pay the carpet installers to do this. I'm concerned that this will be noticeable...valid concern?
2. Remove the subfloor in the addition, plane down the joists and replace the subfloor. We'd likely DIY this, and we've ripped up floors before, so aren't too worried about our ability to do so. But will the new joists eventually shrink and make this room lower than the bedroom?
I'd appreciate advice or suggestions for other options.