I am attempting to put on new subfloor in my kitchen/kitchenette. Here is my issue:
There is two different additions that happened here, the first (with the red lines) is an addition put on in the 50's. This addition has settled a bit and all the joist in that side of the kitchen go from level (on the right side in the photo) to about 3/4 of an inch or so out of level to the other side. The area without the red lines (which are representing the direction of the sinking joists) is an addition put on in the 80's or early 90's, which is level. When we took down the wall there we realized we had a problem.
So the question is what do I do here? I am not necessarily looking for the easiest fix but the one that will provide the best outcome, (without knocking it down and starting over). A few things that came to our minds - sister the joists, "pack-out" the joists, Roppe Floor Levelor, just to name a few. What would you do in this situation? We are planning on nu-heat mats and tile throughout both areas.