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That is reason enough to do it
I did 5" with rebar and fiber mesh for my driveway that only ever has at most a 2500HD diesel on it for 12 hours at a time. If its worth doing its worth overdoing.
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I would think 6" at very minimum considering it's spot/point loads.
I just poured a slab at my new garage.
7" thick 4K psi #4 rebar 24" on center with commercial fiber power troweled over 4" of Gravel.
Not near as much weight as you will be putting on it.
I've been know to overkill as a GC though.
Why on earth did you waste that much money on a garage floor? You could have done a 6-8" base, fiber reinforced concrete at 4" and no grid and it would have held up just the same with car/truck use.
Now some poor guy is going to have to jackhammer that thing out in 70 years when it needs to be replaced. That is reason enough to do it
I did 5" with rebar and fiber mesh for my driveway that only ever has at most a 2500HD diesel on it for 12 hours at a time. If its worth doing its worth overdoing.
It's not really, and I'll give you a good example.
Take decorative residential concrete.
Great stuff, but it is frequently ripped out and replaced within 20 years. Stamp preferences change, color preferences change with what is in style, and even with perfect upkeep, the surface gets a little beat up and you can't make it look like brand new again without re-doing it, especially here where salt is going to find it's way onto anywhere that sees foot traffic in the winter.
A 4" walkway with only fiber in it will come out easy as pie with a mini-ex, but if you rip into it and find out that it's 6" thick and has a rebar grid inside it, then it's change order time, and the labor to rip it out just went up, because now you need to get a hammer attachment, you have to pay a guy to stand there with a demo saw cutting the grid as you mangle it, the fill needs to be sorted from the scrap and taken away in separate loads if you don't have a place to dump reinforced fill (lots of people are picky about not having steel in the fill)
Over doing it on a job like that costs more money twice.