Adjustable columns

[JStructsteel]

When retrofitting and adding a steel beam to a residence, it seems to be basic practice to use an adjustable column (threaded end). I was looking at this product https://tigerbrandjackpost.com/floor-jacks/
These seem a temporary or secondary support.

What have folks used in the past?

I need to support a beam to first floor, then under that a post to the basement. Adjustability is important, have the contractor order fabricated column accurately? I figure in basement I can have a 1" shim and grout space.

 

[RWW0002]

There are some jack posts with ICC reports. I recommend sticking with those. The ICC versions (often from the same companies) should not be labeled with the "temporary support" language. I do not know that any of the "telescoping" versions are ICC approved though.. Here are a couple I have found in the past

 

[jayrod12]

We regularly use redjack brand heavy duty adjustable teleposts in permanent applications. so it's not that crazy in my mind.

 

[RWW0002]

Here is an ICC report from TigerBrand.

ESR-1766F - ICC Evaluation Service, LLC (ICC-ES)

icc-es.org

 

[JStructsteel]

Thanks, will check them out.

 

[XR250]

I never have issues with the columns being the wrong length. I def. prefer a fabbed column.
My problem with these is you need to install them with the threaded end down for greater stability in which case the bearing plate is too flimsy.

 

[Enable]

If you do not feel comfortable using an off the shelf product you can always have them fabricate it that way. Just weld a nut to the HSS top plate and let a threaded rod slide through (drill a hole - dont torch, punch or plasma cut it). Also weld a nut to end of threaded rod in contact with support baseplate (the plate touching the thing being supported) to allow for easy final adjustments - easy peasy (use weldable components obviously). However, if they can site measure prior to fabrication I agree with XR250 in that this probably won't be an issue for a conventional column with a minor amount of shims.

EDIT - if you're going the fabricate your own adjustable column route you'll want to use fine threads. If you use course threads a single turn may cover too much distance such that you can't bash the thing in (and you'll have to shim anyways).

 

[XR250]

Do you actually need a steel column? I use wood posts for most steel beam installs.

 

[jerseyshore]

Some adjustable screw columns can be converted to permanent installation. Usually it involves grinding off the threads to make it no longer adjustable.

I've never spec'd an adjustable column before though. If it's just a basement most people will use lally columns since those are easily trimmed to size. Any contractor with a working tape measure should be able to get a column within 1/2-1" and shim the rest with steel plates and or grout.