The 6-foot-5, 275-pound Carlberg attended the defensive linemen position meeting at the Hawkeyes junior day. He liked what he heard and saw.
"I learned a lot about their stunts for defense," Carlberg said. "I liked the way they set up their linemen and how they can read the (offensive) linemen very well."
Carlberg already is receiving quite a bit of attention on the recruiting trail. He reports scholarship offers from Minnesota, Pittsburgh and Rutgers. He's also hearing from Cincinnati, Iowa State, Nebraska and Vanderbilt in addition to Iowa.
"I loved the coaches, the facilities and the new facilities that they are getting," Carlberg said of the Hawkeye junior day. "The coaches seemed very nice and willing to do anything for their players."
Scout.com pegs Carlberg as a three-star prospect on its five-star scale. That grade is tied to him being an offensive tackle.
Carlberg is using campus visits to get a feel for life as a college athlete. He has an idea of what that would be like at Iowa after talking to players there.
"I learned a lot about the housing situation and how close the football team is; kind of a family atmosphere," Carlberg said.
While Carlberg left Iowa City without a scholarship offer, he believes he's in good position with the Hawkeyes.
"I would say they are very interested," he said. "They said in a meeting that all the players (at junior day) they are very interested in."
Carlberg said he's scheduled to attend Nebraska's junior day on Feb. 1.