Re: Getting rid of stumps
I ground a big stump in my front yard 4 years ago. Went down about a foot, cleaned out chips and refilled with good soil, replanted lawn.
Every year, it still settles. Wood left in ground will rot and it will settle. OK if your lawn is only thing resting on it.
If I were building on top, I'd use or rent a back hoe, dig down the sides, chop off any spreading roots and pull the stump out. Then back fill, tamping down real good every 6 inches of back fill.
You don't want to see concrete floor cracks a year or two after your garage is built. Then you'd be in for some REAL costs!! Footings are to be placed only atop undisturbed ground, and any settling below a slab, is going to leave a weak spot just waiting for that car or tractor tire to collapse it.
Unless it is just out in the yard, pull the stump out. Luck has a habit of running out just when the concrete job is complete.
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