This proceeding is before the Occupational Safety and Health Review Commission (the Commission or OSHRC) pursuant to § 10(c) of the Occupational Safety and Health Act of 1970, 29 U.S.C. § 659(c) (the Act). Ontario Exteriors, Inc. (Respondent or Ontario) was replacing the shingle roof of a two-story residence at 6712 Song Hill Lane, Victor, New York 14564 (worksite) on May 3, 2017, when an employee fell from the roof and was injured.