I have a dekblox (or whatever they are called) ground level deck. It's about 10x16 and it was built on soil that is still settling. The part closest to my house dropped about 2 inches over the winter and about a month ago, I popped off a couple of deck boards, threw the car jack underneath it and shimmed it up a bit.
The dekblox work really well. The materials calculator on their site is a little to pro using more of their material. For my 10x16 deck, I used 12 piers.
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