Criteria Development Group (CDG) | CGD-SPF member list Criteria Development Group (CDG) for Spray Foam Roof Systems Performance Criteria for Constructed Roof Systems Jamie McAdam, Chairman F.J. Dahill Co. Inc. New Haven, Ct. Jim Anderson BASF Polyurethane Foam Enterprises, LLC Minneapolis, Minn. Sig Hall Western Pacific Roofing Corp. Palm Springs, Calif John T. Hatfield Penta Roof Consultants Inc. Lawrenceville, Ga. Don Lenaker Resin Technology Co. Ontario, Calif. Ed Lundin Lundin Roofing Co. Inc. Port Allen, La. (one open seat on SPF CDG)