Article in the current JLC about a company that specializes in repairing condominium balconies in California. He states that the use of sheathing under the cement stucco is unusual – typically there is 60 minute paper over the studs, then lath, and the stucco. He mentions the 60 minute paper more than once. In one of the pictures you can see some type of paper, and it looks as thin as house wrap, so apparently the term ‘paper’ is correct. Anyway, what kind of paper has a 60 minute rating?