Wow! Lot's of nice replies! Thanks again for all the visits!
Get to the pictures!
Early this morning I went down to the local home store to shop for treated timbers for my shop add-on.
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These are the ones I salvaged last fall before I dreamed of adding on to the shop. I need seven, and found seven good ones.
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A couple of them have a little wind to them, but I need 12 ft and those are 18 ft long, I can trim most of the bend or twist out.
Still have enough for a small shed and lots of cribbing.
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My little son in law (I call him that, but he is 69) brought his backhoe over today (who doesn't like a SIL with a backhoe?)
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He is a heavy equipment operator, code welder, rancher, and has common sense out the wahzoo. He also has bad luck, drew an engineer for a FIL.
We shot levels and decided to cut the existing shed floor about 10 inches to minimize outside fill. There will be a nine inch step from the main shop floor down to the add-on 6-inch slab.
Did I say he was an equipment operator

He is a real ace. I trusted him to relocate my new compressor (my rigging so he had an out). His first try at cutting the dirt floor (2 inches at the opening, 10 inches at the wall) was off by 1 inch and sloped 1/2 inch in 15 feet. I'm always amazed at his eye, and control of the hoe. I make a test measurement and it is right on and he just smiles. I rig for him and am very comfortable working right next to the bucket. That goes against all the refinery safety training I've had but it works for us.
He got into a little rock on the north end and the cut is a little variable there, but, all in all a very productive day.
Looking south
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Where the old Ford V8 trailer was, and an elm tree he dug out for me
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Looking north
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I'm ready to set poles, but it makes a lot more sense to pour the existing shed, then put in an expansion joint and pour the new addition.
Tomorrow we'll do final grading on the existing shed, shoot the outdoor pad, form the existing shed and start putting down vapor barrier and wire.
This is really fun even if I don't clean up my shop I'm going to have a 30x40 bay to store up to six cars in (they can stack in the existing shed with a little blue steel) plus I'm adding a foundry room on the north end.