mountain/mole hill. It's a stick framed garage. You wasted a lot of concrete. I wouldn't worry about it.
What you DO need to do is make sure the slab gets done right. Are you playing contractor or do you have one? Either way, educate yourself and make sure the slab is done right.
Drainage
Reinforcing steel
Cure time control
Vaper barrier
Car lift specs
Back fill
etc.,etc., so forth and so on.
Much ado about nothing.
This is Atlanta GA. The frost line is 5". It's a wood frame building. You literally could have built it without a footing at all.
The 12" footing was designed to hold the weight of the concrete (stem wall), and it sits on undisturbed red GA clay (one of the best building materials available). You haven't added weight, and won't have a (n additional) settling problem.
If you tell them to jackhammer it out and redo it, you can kiss your 50% deposit goodbye. You'll be looking for another concrete guy (and have to pay him for both the demo AND the job).
Have them drill long threaded rod through the footing with epoxy for your anchor bolts. It will also act as vertical reinforcement.
Just make sure you get your waterproofing and drainage right. Wet soil is heavy against that stem wall.
Great to see your progress! Keep up the good work! (And call me for your framing party!) 😊
In reply to SV reX :
From a 8" wall to a 24x30 inch block is a huge amount of weight added ,something like 40,000 pounds .I wouldn't be worried at all about vertical reinforcement as much as horizontal. Sure it's a light building but here with frost and water I'd be worried about it cracking and letting water thru leading to more cracking.
The thing that worries me the most though, no concrete guy would think to fill up the trench without more rebar. So either his help really sucks, or they as a unit do.
The "extra compaction so the slab won't settle" is also concerning. It doesn't take much movement to crack a slab, and GigantoFooting is gonna settle. Id be more inclined to throw a lot more steel in but it sort of sounds like it's just gonna have fiber.
Mostly though I'm alarmed to see this happening in an absolutely butt simple job, I wouldn't want them doing my concrete.
maschinenbau said:Isn't this basically a normal basement foundation footing but with a mega huge block underneath it all?
It is, but that not what you have. You have a huge non reinforced block of weight that technically really isn't a concrete foundation. Concrete by itself isn't really strong, but reinforced concrete is exceptionally strong.
Basically they seem to be selling you on you getting something stronger, but in reality you are getting something weaker
Also I have seen someone do something sort of similar, he is an electrical engineer and thought huge amounts of concrete means strength.
He had it 3 feet below ground and 1 foot above. It's cracked apart a lot
It's not an increase from 8" wall to 24" x 30". The original planned footing was 12" x 24", so the difference is 18" x 24". It's 66 cubic feet of concrete per wall. Concrete weighs about 150 lbs per cubic foot. That's 9900 lbs evenly distributed over 44 square feet- that's 225 lbs per square foot. About the same as a man standing on it.
I repeat... much ado about nothing.
In reply to SV reX :
9900 a wall equals roughly 40k for the building, you are saying the same thing as I am.
I don't know what the grounds like there vs here, here that would be a massive problem.
And I cannot stress this enough, no one that does concrete would have done that. " Whoops, gonna have to order 3 more full trucks of concrete for this foundation". It's very strange.
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