Inspector/Packer applicants have rated the interview process at Johns Manville with 1 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 61.1% positive. This is according to Glassdoor user ratings.
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Three person interview squad and they each took turn asking various questions and asking your attributes and weaknesses. It seemed important to them that you knew basic math and were a safe worker. The entire interview took about 30 minutes.