Your building is only as good as the envelope enclosing it.

90% of our work is from returning customers who have come to understand that when the outside gets in and the inside gets out, everything else is at risk. We find problems in the design stage, stop the mistakes in the construction phase, and test the work throughout to make sure you are getting what you’ve paid for. Simply put, we prevent and solve building envelope problems before they become your problem later.

Mouse-over a highlighted area below for more information and click to learn more about each.

Bill is the managing and founding partner of W.H. Coltzer International (WHCI), Zero/Six Consulting, LLC (an architecture and exterior building envelope consulting firm), Z6 Commissioning, LLC (a performance testing firm), and Coltzer Company, LLC (construction company). As the son of a general contractor, Bill grew up participating in the family construction business and after graduating from Texas A&M in 1984, became a licensed Architect in 1993. Since the creation of Zero/Six Consulting, LLC in 2003, Bill has participated in the remediation, design, and testing of numerous facilities across the Nation ranging in values of a few million dollars to over a few hundred million. The combination of construction knowledge, architectural training, and real-world experience gives Bill a unique perspective in the dispute resolution process.

Jeff is the Director of Engineering of Zero/Six Consulting, LLC (an architecture and exterior building envelope consulting firm). After graduating from The University of Texas with a Bachelor of Science in Civil Engineering, Jeff has used his expertise in the field with roofing, waterproofing, and fenestration inspections, as well as in the office with computer-aided drafting, modeling, and engineering analysis. He has been deeply involved in the testing aspects of building envelope commissioning serving as the Quality Control Manager to ensure the Z6 ISO/IEC 17025:2017 accredited laboratory and team are strictly following international test standards to accurately, objectively, and impartially report on the integrity of building materials and products to certify that the installed systems interface as intended. Jeff has been Appointed Qualified Inspector by The Texas Department of Insurance (TDI).