My floors pitch in the same spots as they do on the 1st and 2nd floors.
My home was built in the 1890's. I have some soft spots in the basement joists and added 4x4" posts to each side of the main support beam in the basement. I jacked up the floors and realized I have a load bearing wall, or at least I think I do, that doesn't line up with a joist or any support beam in the basement.
The wall I think that is load bearing, has a heating duct that goes up it, would that still be considered a load bearing wall? I am fairly new to handy man work.
The image attached depicts my main support beam (orange) and joists in the basement (pink) (stone foundation), the green lines are the 4x4" posts we put in place. The blue line is where the load bearing wall is.
The joists are 2x7", 13' long on each side of the main beam, about 19" apart - there is a lot of piping, wires, so sistering would be a huge project.
I noticed a couple weeks after we put the posts up (green lines), the floor near the blue line pitches more than before, the same in the 2nd floor and there is a small hairline crack running along the edge of the ceiling, about an inch from where the ceiling meets the wall, this runs perpedicular to the load bearing wall, as seen in the sketch below. The blue line is the load bearing wall, which leads into the laundry room, and the black line is the outline of the living room (where I see the hairline crack in the ceiling), around the corner is a hallway that leads to the stairs to go upstairs. The orange line is the hairline crack in the ceiling, I believe it is plaster.
I am going to try and slowly jack up the load bearing wall with more posts, its not pretty, but I don't mind a series of posts in the basement at this point for peace of mind. I had a company quote me for $9300, that would involve what I did with the two posts (green) I ran parallel to the main support beam and installing a steel beam in the 1st floor ceiling to support the joists above it. I thought I'd try to see if I could it myself, I know when to defer to a professional, if I don't see much improvement after I jack my load bearing up with support, then I will bring in a professional.
What are some things you would recommend at this point, do I not try and jack up the load bearing wall slowly, etc...?