Our Clients

The best resource for gauging a company’s deliverable’s and client satisfaction is historic; Zero/Six has maintained an excellent relationship with former clients, having a 90% return client base, while simultaneously expanding our relationships and partnering with new architectural and construction teams. Our reputation for excellence is based on outstanding service and quality control and assurance.

Zero/Six has been a part of over 480 projects, the majority of our projects have been in the markets of technologically challenging facilities such as higher education, medical facilities and commercial support facilities. Each project involves unique challenges, and we receive the highest compliments from clients including; architectural firms, attorneys, owners and contractors.

ARCHITECTS/ENGINEERS

AEI Engineering, Inc.
Earth Engineering, Inc.
HDR Architecture, Inc.
Muñoz & Company
Treanor Architects
WHR Architects
Page
PGAL
Aestimo, Inc
Corgan
DBR Engineering Consultants
Energy Architecture
EYP, Inc.
Gensler
Stantec
Kirksey

ATTORNEYS

Benjamin, Vana, Martinez & Biggs, LLP.
Carrigan, McCloskey, Robertson
Germer Beaman & Brown PLLC
Harrison, Steck P.C
Heard & Medack, P.C.
Funderburk Fubderburk Courtois LLP
Touchstone, Bernays
Thomposon Coe
The Gardner Law Firm
Resnik & Louis PC
McLeod, Alexander, Powel & Apffel, P.C.

CONTRACTORS

Barlett Cocke General Contractors
Hensel Phelps Construction Co.
Spaw-Glass
Tellepsen
Vaughn Construction
All Type Roofing
Anslow Bryant Construction
Anchor-Ventana Glass
Broome Welding & Machine Co.
Chamberlin Roofing & Waterproofing
Collier Construction Inc.
D E Harvey Builders
Manhattan Construction Company
Noble Construction Group
SRP Enviromental
George D. Alan Co.
Texas Moisture Protection
LS Decker Inc.
TDC Waterproofing & Restoration
JE Dunn
FW Walton Inc.

HEALTHCARE / MEDICAL

MD Anderson Cancer Center
Methodist Hospital System
The University of Texas Medical Branch
University of Texas Health and Science Center

MUNICIPAL

City of Galveston
City of Houston
City of College Station
Harris County

OWNERS

Baylor University
BBVA Compass
Holy Family Parrish
MD Anderson Cancer Center
Methodist Hospital System
Metro National
Moody Memorial First United Methodist Church
South Main Baptist Church
Texas A&M University
Thibodaux Regional Medical Center
University of Houston System
University of Texas System
Frost Bank
Galveston Railroad Museum
Lone Star Dairy Products
Avinext
Post Oak School
Rosenberg Library
American National Insurance Company
Ango Global International, Inc.
Archdiocese at Galveston – Houston
Moody Methodist Church
Holy Family Parish
CBRE Group, Inc
Stream Realty

HIGHER EDUCATION

Baylor University
Texas Southern University
Texas A&M University
Texas Tech University
The University of Houston
The University of Texas
Lamar University
Lone Star College
Texas State University

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).