Screw jack lock nut CMU pier

Ok, just need a little clarification; the locking nut should be welded where the screw meets the post, shouldn’t it? Am I wrong on this?

Also, isn’t the main beam supposed be centered on the CMU pier?

Not sure about the reference regarding the welding of the nut on the floor jack, but that CMU pier seems a tad offset with a “dog leg left” lean from that angle.

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Afternoon Anthony.
Hope this post finds you well.

Did you take an image to the telescoping column from further back?
Was the size proper. Label on the column.
Adjuster are placed at the bottom. Poor orientation.
Requires footing.

CMU column.
Missing bed/head mortar. Suspect installation.
Columns require footing.
Poor beam orientation.
Suspect: Leaning.

Hey Robert,
I’m doing well, as I hope you are.

The thought of a telescoping jack didn’t cross my mind. That would explain the two holes near the base. I’ve attached a few more photos. I didn’t see any labels on any of the poles.

Looks to be a jam nut. Should be tight to the jack to keep it from settling or lowering.


CMU pier if AFU… The jam nut needs to be tight to the post as Walter stated and NOT welded to anything. If it were, you could not make adjustments if needed.

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That’s exactly what it is. They went through a lot of work to use half of an adjustable column to stiffen the over-spaned flooring framing and adding a single member that is about to roll over laterally looking at that first jack. I would be looking around to see the whole picture if it was me.


What appears to be bent over nails aren’t appropriate for the post to beam connection, either.


Hey everyone, thanks for all the info. I’ll be suggesting review by a foundation specialist or structural engineer.

I concur. You’re the best Marcel.
I suspect the floor plates are not secured or welded.

The orientation is wrong. Typically, jam nut arms are encased in concrete/footing to prevent accidental rotation. Top plates are fastened/secured to beams directly.

Play it short to the right and you’ll have a straight 7 iron to the green.

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That CMU Pier is out of vertical approaching 1/2 the width of the CMU, based on the picture. Therefore it is displaying enough movement to be in danger of failure, that is, collapse. Rule of thumb regarding piers and walls, per a structural engineer associate of mine, movement displaying 1/2 the width of the thickness is considered to be in danger of failure and needs repair. IE: for the 8" X 8" X 16" CMU (which is what the picture appears to show) 4" out of vertical is the danger point. If the CMU were 10", the danger point would be 5".