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Originally Posted by BonzoHansen
Charlie, these guys are not typical home users. If they can't set up a lift, well.... Slab thickness is a legit concern but I am sure there are ways to find out, or cut a hole & pour - I'd probably do that anyway for piece of mind to make sure it is deep enough and strong enough concrete. I've seen cars fall off lifts & it is not nice. But I don't see either being a deal breaker here.
I totally see reasons for both types, no doubt, and would never fault anyone's decision. But if I could only have one gimme a 2 post. Now, if I had room for 2, lol....
Scott-
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Another consideration that many won't realize is that house builders rarely compact the soil when they backfill inside the foundation. The soil under the slab along the foundation walls generally settles a bit through time and there is often a void between the slab and the soil. I have seen a void of about 4" in one job that I investigated.
The condition is often unknown because very little load is applied along the edges of the floor when the vehicles are out in the parking areas.
Due to cramped spaces I would guess that many a lift has some of their posts bear near the edges of the floor, right where the soil has settled, thereby causing cause for concern. If/when that piece of concrete breaks under the load, it will be an alarming if not dangerous situation.
It would be good for potential home users to try to determine if the post base locations are on sound bearing by sounding or coring a hole in an adjacent similar location.