Based upon past experience, what thickness of concrete would a 30' tall above-grade ICF wall with only one wood floor 12' from the footer be? This wall would support a roof and floor with a 24' span. Later on the structural engineer will size this tall wall but in the meantime I need a feel for the wall thickness so that I can alter the floor plan. My guess is that the ICF wall thickness will about 8" of concrete plus 5.25" of foam for a total thickness of 13.25". For this type of tall wall above grade, would you describe the reinforcement as light, medium or heavy?

Any seismic concerns? What about wind loading concerns?

We have a 3 story Fairfield Inn here in Russellville, AR built with 6" regular LiteForm ICF (2" foam on each side) from footing to eves.

The site is near Jasper, AL. According to the code, the Basic Wind Speed for 50-year mean recurrence interval is between 90 and 100 miles per hour. The risk of earthquakes is probably low to moderate.

There are no "standards" or prescriptive methods for something like this. It needs an engineer's design by code, and just plain makes good sense. A lot of variables here.