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First, I’d 100% rather just hire pros to do this but I don’t have $10k or so to throw at it. I’m a mechanical engineer and I think, with a lot of help and luck, we can DIY this or something pretty close at least.
The plan is a concrete bench with a planter box around the back. Was looking at maybe a 3” thick wall for planter down to a depth of about 8-12”.
The entire area would be dug out, tamped, leveled, and set up for maybe 4-6” depth pad for the foundation and is about 15ft x 15ft. I’d plan to hire a concrete truck/pump and would like to fill the pad (bottom right) at the same time.
The main questions right now are:
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Do I need a concrete foundation? How deep? What kind of sub to use?
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What kind of drainage precautions should I consider?
I have more questions. Some i don’t even know yet, but any help is appreciated.