Criteria Development Group (CDG) | CGD-BUR member list Criteria Development Group (CDG) for Built-up Roof Systems Performance Criteria for Constructed Roof Systems David Scheirer, Chairman Johns Manville Denver, Colo. Scott Baxter CRS of Monroe Inc. Monroe, N.C. Michael D. Blanchette Amtech Roofing Consultants Inc. Dallas, Texas Helene Hardy Pierce GAF Materials Corp. Wayne, N.J. Jay Keating Owens Corning Summit, Ill. R. Bruce McCrory Kiker Corp. Mobile, Ala. (one open seat BUR CDG)