I don't think you actually want to put the lumber down to the soil level. What is usually done is a steel base for the timber with an anchor hole at the bottom is placed at the base of the timber. Then a matching hole is drilled in the concrete to place the anchor. That keeps the timber off the ground and away from moisture that will rot it.
This is an example of one I found. There are several different designs.
http://www.homedepot.com/h_d1/N-5yc1v/R-100374896/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=post+base&storeId=10051
Steve
I want to put two 6"X6" treated lumber posts into an existing cement
patio for an extension of a deck. The cement is about 4" thick. I know I
can drill a hole in the cement, but is there a way to "drill" a square
hole to fit the 6"X6" lumber into the existing cement?
Thanks,
ltd
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