15 years ago when we built our house and 20X40 garage our lot sloped quite a bit. I had to have 8' walls poured on all four sides of the garage fondation to make the garage look right with the house. Unfortunately I didn't have the funds to deck the floor so it was filled with dirt and somewhat compacted(using a bobcat). I waited a year to install the 4"(possibly more like 5") concrete floor, to allow for settling. Instead of wire the figerglass strands(or whatever it's called) was used. The floor was pinned to the walls. I'd like to put a lift in even though I've got 10' walls(probably 10'3"). There are 9'3" lifts avaliable but I can also go above my rafters. Being 5'7" I believe I'll get all the headroom clearence I need. My question is do you think the current floor will support the lift or am I going to have to cut the floor, drill down 8' or so to get to a solid footing under each "foot" of the lift? Won't cutting the floor caue it t possiblyweaken at the areas cut? TIA Pete

The people I have talked too have told me that a solid 4" floor will support most 2 point lifts that have the large footprints. I would assume that the 5" would be just fine. Have you had any cracking in the floor so far? if not then you shoulnt have any problem at all. You have been parking your vehicles on it so far, the hoist might only add another 1000 lbs total, but the footprints are bigger than your tires' footprints.

Bend Pak requires 4" flooring @3000psi:
Floor Requirements -

All two-post lifts shown on this web site MUST be installed on concrete only.

Concrete MUST be a minimum thickness of 4".

Concrete MUST be 3,000 PSI minimum hardness.

All installation instructions and floor requirements are included with lift and MUST be followed exactly for safety and warranty purposes.


http://www.asedeals.com/two_post_lift_specs.html

BTW the sale price on the MX-10C is $2236 shipped.