would you find this acceptable? [instead of stubbing the ufer up through the foundation wall 12" above the bottom plate indoors,] stub the Ufer rebar out of the footing, outdoors exposed to the dirt and weather, with a typical ground rod connection made to this Ufer. pipes, conduits, and rods can be iron or steel, if the conditions are met in 250, but it seems to me that rebar doesn't really fit outdoors in a wet environment. i would expect it to rust and lose its value at the acorn or clamp connection. but we allow clamps to bond to galvanized water pipes and black iron gas lines outdoors, and you are supposed to scrape the coating off to make a good bond. go figure.