Building Technology Consultants, Inc. is pleased to announce that Christopher Kottra has earned the Registered Waterproofing Consultant (RWC®) designation from the International Institute of Building Enclosure Consultants (IIBEC). He qualified for this designation by meeting the requirements of a 2-part program based on an application process and the successful completion of a challenging examination. He now joins an elite group of over 120 Registered Waterproofing Consultants worldwide.