Garage foundation questions
I'm about to start on a 24x36 detached 2-story gambrel garage in southern NH. Planning on a standard 4' frost wall on footings.
1) Garage is to be built at the end of my driveway, which is fill from when the house was built 20 years ago. Front part of the footings will probably rest on original grade, but in the back it'll be on the filled area.
2) one back corner drops off so that at that corner I'll have to go down 10-12' to get to dirt, which will be pretty close to the original grade.
Looking for some opinions & education before I start talking to foundation contractors. My dad has bulldozer, backhoe & dump truck, so we'll be able to do the digging & filling ourselves, but figured I'd get a pro to do the concrete.
Building inspector didn't say anything in particular when I got my permit, so I don't think I'll be dealing with code issues so much as trying to make sure it holds up well.
I'm thinking that a slightly larger than normal footing with good reinforcing would be the critical part here - any suggestions for size?
On the corner with the deeper wall, what would be the normal way to handle this - drop the footing down, then build a wall to the height of the rest of the footing, then build the rest of the wall on that, or bring the low corner up in one shot with the rest of the footing?
Any comments welcome.