Hey guys, I am considering making a root cellar/ underground storage building sometime in the near future. I was curious if there would be any issues with me digging a hole, pouring a cement flour 30x10x10 and then laying cinder block walls, placing rebar down the holes. Then I would go back and fill them with cement. After that I need to figure out how to put a solid roof on this thing. I would like for it to be 3 or 4 feet under ground. Does anyone have any ideas?