Well, it took a week but we got it finished. The engineer specified a moisture barrier around the perimeter of the house. We had to dig 8 feet deep and pour 6 feet of concrete with plastic around the outside. That should keep water from getting under the pad and expanding/contracting or washing away the sandy loam from underneath. The soil is soft sand for about 2 feet, then clay, then hard clay, then really really hard clay at about 7 feet. It was really hot, dirty work but it's done. Next I'll replace the top 6 inches with road base and pack it down before installing plastic on top, then rebar, plumming and finally, the pour for the pad.
My brother's wife's uncle Lonnie ran the machine for this dig and I did the layout, smoothing, trimming and grading. I did run the machine a little, which wasn't too hard to do, except for the extreme heat and sheer boredom of it, but Lonnie has done this kind of work his whole life and was much faster and more innovative than I. He did some things with the machine I would have never thought of. I'd like to say we enjoyed this but it was projected to take a weekend and ended up taking a full 7 days, due to the hardness of the soil at depth. A good lesson for you kids, don't burn your bridges with these older folks, they have a lot of experience and know-how!
I should have some road base delivered this week and start building the pad up and leveling it. Road base is a mixture of limestone, clay and sand. It packs down hard and level with a vibrating machine and provides good structural support for the concrete pad. I'll go around the perimeter of each of the squares you see above with road base in sand bags and fill in the middle, level and tamp. I'll put some loose road base in the beams to pack them down and make them level and solid, too.



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