Need help with an unusual lifting/ jacking situation. Pics added!

[MatBirch]

So, I learned yesterday that some jacksmile did a smash up job of building the basement staircase in my old house. During a remodel somewhere “back in the day”, they framed in the staircase between two rooms. On one side they attached the stringer to the rim joist of the adjacent room. Trouble is both the rim joist and the stringer just “end” at the top of the stairs. The rim joist is just hanging in the air, approximately 2’ short of the foundation. Both are being suspended from the roof above. After probably 50-70 years, the corner of the room is sagging. I need to jack up and support the area under the rim joist. My problem is that I only have about 3” of the end of the joist to seat a jack. Or a post... there is not room for me to get the wall up with a jack AND get a post in. The stringer comes in at the angle, so it interferes not giving me any room.
I have an idea, but I don’t know if it will work from a physics standpoint.

If I took two tapered shims from opposite side of the post under the joist, could I get enough force to lift the building by using my bigazz Bessey welding clamp to pull the shims together??

It looks like I need to go up about 1/2-3/4”. I would have to make shims out of something bigger and tougher than door/window shims.

Any thoughts, ideas, or encouragement?

 

[PCustoms]

This is one of those times a pic would be really helpfull

 

[PCustoms]

Put an adjustable support post in, they have integrated screw jacks

 

[unslow1]

This is one of those times a pic would be really helpfull

I checked this thread just to see the pictures.

 

[Burl]

Seems like a job. Are things cracking/sagging?

 

[MatBirch]

You see the rim joist and the top of the stringer here. What you don’t see is on the backside, there is a scab tying the stringer to the joist.
On the top side, you see the “studs” are separating from the bottom plate.

 

[MatBirch]

Nothing to see here... Everything just ends. Why in the hell would they not just take another foot or so and land on the foundation? That’s a foundation vent you see there, but geez, figure it out!

 

[bas157]

How about a jack post?

 

[PCustoms]

How about a jack post?

Put an adjustable support post in, they have integrated screw jacks

Looks like a crawlspace base on the pics?

If not, jack post, lolly column etc. Is the answer. Screw it a little per day and in a week you've got your level back.

 

[MatBirch]

But there’s no place to put it to do the work, then get the new post in to finish it...??
I only have room for a post or a jack, not both.
If you closely at the picture, where the copper ground wire dives under (and turns green), you’ll see the short space on the rim joist behind the point of the stringer. That is the ONLY place I can get support.

 

[bas157]

A jack post has a screw section, so it can both support and lift. Just leave it in place. Or is there not much room below it to get a jack post in there? If that is the case, what about a heavy duty screw jack stand, like this: https://www.homedepot.com/p/reviews...Screw-Style-Jack-Stand-Tall-10803/306548531/1

 

[rayra]

Jackpost. Or learn about this hot new invention called "wedges".

 

[Uncle murph]

So, I learned yesterday that some jacksmile did a smash up job of building the basement staircase in my old house. During a remodel somewhere “back in the day”, they framed in the staircase between two rooms. On one side they attached the stringer to the rim joist of the adjacent room. Trouble is both the rim joist and the stringer just “end” at the top of the stairs. The rim joist is just hanging in the air, approximately 2’ short of the foundation. Both are being suspended from the roof above. After probably 50-70 years, the corner of the room is sagging. I need to jack up and support the area under the rim joist. My problem is that I only have about 3” of the end of the joist to seat a jack. Or a post... there is not room for me to get the wall up with a jack AND get a post in. The stringer comes in at the angle, so it interferes not giving me any room.
I have an idea, but I don’t know if it will work from a physics standpoint.

If I took two tapered shims from opposite side of the post under the joist, could I get enough force to lift the building by using my bigazz Bessey welding clamp to pull the shims together??

It looks like I need to go up about 1/2-3/4”. I would have to make shims out of something bigger and tougher than door/window shims.

Any thoughts, ideas, or encouragement?

If I’m understanding and seeing correctly,you are trying to work around a staircase ,considering the seriousness of what you’re attempting the staircase is of zero impact,remove it while you work or at least remove the treads and risers which are interfering with your work.When your done you can repair or replace as needed.

 

[cvairwerks]

Use a concrete stepping stone as a pad and a machinist jack and it's done.

 

[PCustoms]

Nothing to see here... Everything just ends. Why in the hell would they not just take another foot or so and land on the foundation? That’s a foundation vent you see there, but geez, figure it out!

Is this where you need to put your new post?

How much clearance, i.e. how tall will the post be?

 

[finn]

Cut some 2x6 shims and use them to temporarily widen the beam to get it to hang over the obstructions and provide a jacking point.

Use construction screws orthru bolts to bolt the shins to the rim joist and then use lolly posts to jack up the beam in question.

This doesn’t look that complicated if you

 

[Toolfool]

If it was mine, I would tear the stairs out and rebuild/replace everything the right way. So the next owner doesn't think I was the "jacksmile",.

 

[Joemctag]

What Uncle Murph and Tooltool said. Takeout stringer too.
That header ( rim joist ) may not be able to take all the force at that one point. Think I’d use several of the post-with-screw jacks that’ve been mentioned. Not under the rim joist, but under a temporary beam under the ceiling of the room beyond a foot or two in from the header. That’s kinda the right way to do this kinda thing.