Elevated 4-post columns

[sierradmax]

While many 4-post manufacturers say they don't need to be anchored down, I intend to...

However, I need to gain an extra 5" of runway clearance to my Atlas Garage pro 9000 EXT. It currently has 81" clearance underneath and I need to get it to 86" in order to fit a taller vehicle beneath. The lift will solely be used as a storage lift for a corvette.

I laid out the locations of the columns and drilled 3/16" test holes.. Concrete slab thickness varies from 4"-4.5".

My thoughts are 3/4" drop-ins with 3/4" all-thread, washers and leveling nuts to get desired height. The form and pour grout pads. Has anyone done similar?

 

[mike93lx]

5" hits me as a lot of height to make up. Curious what responses will look like

 

[mepstein]

What about a big chunk of metal as a spacer?

 

[sierradmax]

What about a big chunk of metal as a spacer?

I think this idea might be cheaper alternative and less invasive.

 

[Cryptic1911]

that should work just fine.. but you may need to make / get some longer ramp extensions to keep the angle decent for driving onto. You could make some out of stepped 2x4's, or maybe get a set of race ramps to toss under the end of the metal ramps on the lift

 

[sierradmax]

that should work just fine.. but you may need to make / get some longer ramp extensions to keep the angle decent for driving onto. You could make some out of stepped 2x4's, or maybe get a set of race ramps to toss under the end of the metal ramps on the lift

Yeah, I'm aware. Fix one problem to create another.

 

[danfromsyr]

honestly so long as the bolts go well into the base concrete. you could use hardwood as spacing.. it won't crush and if it's oil/treated won't rot out