Zero/Six Consulting, LLC is a multifaceted professional services company specializing in the commissioning of high-performance buildings.

icon_widget_image Monday-Friday: 8:00 AM to 5:00 PM icon_widget_image 1027 Tremont Street, Galveston, TX 77550. icon_widget_image (409) 740 0090 (Office) (409) 740 0554 (Fax) icon_widget_image
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About us

Discover our journey and innovation in building excellence


Our mission 

We will utilize the most cutting-edge processes to provide the absolute best services with the most talented team available while maintaining the highest integrity. Our commitment to innovation, excellence, and unwavering ethical standards drives our dedication to exceeding client expectations and making a positive impact in every endeavor.

Firm Profile

Zero/Six Consulting, LLC was founded in 2003 by Bill Coltzer Jr., AIA in response to an industry-wide need for higher performing and cohesive building envelope systems. Since its establishment, Zero/Six has become a leader in delivering innovative solutions for the creation and maintenance of better building envelopes.

A firm focused solely on building envelope integrity, we have assembled a staff of professionals with diverse skill sets — Architects, Engineers, LEED Green Associates, Registered Roofing Observers (RRO), Project Managers, and Field Specialists — to achieve the necessary “whole building” approach.

Envelope Expertise

Our extensive knowledge and experience with those portions of your facility separating indoor and outdoor environments will ensure accurate assessments of current conditions and reliably forecasting future demands in maintenance and capital investment. All major building systems and elements (including but not limited to roofing, glazing, cladding, and waterproofing systems) are identified and assessed; estimated remaining useful life is determined; and cost-effective resolutions with budgetary cost estimates are developed for ongoing maintenance and specific deficiencies. And at every point, we remain focused on helping our clients meet their goals in building reliable new construction, operating existing facilities, or restoring historic structures for new uses.

Our Three Step Process

The three step process and the specialized expertise Zero/Six utilizes to deliver on the services are set forth in each project.

Develop the Intent


Eight out of every ten construction litigation cases involve water infiltration. The Owner seeks to take delivery on a building that will prove to be an asset rather than an ongoing liability. Therefore, it is vital to establish project requirements in regards to the building enclosure at the earliest stages of the process. This can be done only by expertise in architecture that is specific to the building enclosure.

Architecture – Led by our CEO Bill Coltzer Jr., AIA, a licensed Architect, with over 30 years of specialized experience in building enclosure design and specification. Mr. Coltzer will work with the client to lead his team through the schematic and design stages, insuring they satisfy the design intent.

Inspect the Product

Quality Control / Quality Assurance

Once our client has secured construction documents that convey their intent, the next step in the process is to “Inspect the Product” through a quality control (QC) program executed by Zero/Six staff that understand how the various systems will interface. These individuals are able to go beyond just understanding how the systems interface in their investigations, as the success of the QC program is largely dependent on the ability of the inspectors to safely access hard to reach areas. Finally, as part of the QC program, deficient work will be logged as it is observed and then tracked to a resolution.

Test the Collaborative Effort


Successful delivery of the Owner’s intent goes beyond quality control by verifying the successful collaboration of designers, manufacturers and installers through an accredited testing program. Since testing verifies design, as well as construction, the collaborative effort must be tested as early in the process as practical so repetitive deficiencies can be corrected prior to a full blown remediation effort. Zero/Six along with The Z6Cx Team is an industry leading commissioning, windstorm and stormwater engineering firm that also provides ISO-accredited building performance testing both in the field and laboratory settings, will test this collaborative effort to ensure our clients take delivery on a building that meets their intent.

Our Expertise



Make crucial decisions that minimize maintenance related life cycle costs and maximize the sustainability of a building.


Our team ensures that the building envelope products & installations meet the rigorous industry standards.


We bring the right people at the right time for an outcome that ensures the integrity, quality and performance of projects.


Our experts investigate buildings, spaces & other environments to resolve conflicts on any construction issue.


Comprehensive services for maximum building energy conservation through energy modeling.


Our specialists expertly customize a program that optimally preserves and extends your building's longevity and functionality.


Expertly develop custom testing protocols for unique projects at our full-service performance testing lab facility.


Pre-installation field testing ensures components interface correctly, guaranteeing smooth system operation as intended upon installation.


Your source for windows, walls, and roofing Solutions. Our dedicated building envelope experts are ready to provide the answers you need.

Professional affiliations

Scope of Accreditation

To ISO/IEC 17025:2017 Testing

 Certificate Number: AT-2090 / Valid to: October 26 2024


ISO/IEC 17025 certification has been awarded to Zero/Six Consulting, LLC. by the ANSI-ASQ National Accreditation Board (ANAB/ILAC). 

This pinnacle of international accreditation requires us to conform to the highest standards in testing procedures available to achieve optimal building envelope efficiency for our clients.

Z6 can now provide our clients with laboratory and field services that are benchmarked against systems and standards to ensure uniformity and integrity of test results. Our clients can rest easy in the knowledge that each year Z6 will undergo an exhaustive external audit of quality control.

Construction Materials and Mechanical

Specific Tests and/or Properties Measured Specification, Standard, Method, or Test Technique Items, Materials or Product Tested Key Equipment or Technology
Water infiltration ASTM E 1105, ASTM E331, ASTM E547, AAMA 501 Exterior Windows, Doors, Skylights, Curtain Walls Water Distribution Rack, Centrifugal Blower, Manometer, Wind Generator, Spray Wand
Air Infiltration ASTM E283, ASTM E783 Exterior Windows, Doors, Skylights, Curtain Walls Centrifugal Blower, Laminar Flow Element, Manometer
Water and Air Infiltration AAMA 502, AAMA 503 Exterior Windows, Doors, Skylights, Curtain Walls Water Distribution Rack, Centrifugal Blower, Manometer
Deflection / Deglazing ASTM E330 Exterior Windows, Doors, Skylights, Curtain Walls Digital Deflection Indicator, Centrifugal Blower
Uplift Force ASTM E907, FM Global 1-52 Roofing Systems Uplift Chamber, Manometer, Centrifugal Blower
Roofing, Window Sealant, Foundation Humidity, Cladding Moisture Absorption ASTM C1521, ASTM F2170, Rilem Commission 25/PEM test method 1154) Miscellaneous Sealant Test Kit, , in situ probes, Rilem Tubes
Whole Building Enclosure Airtightness Compliance ASTM E779, ASTM E1186 Building and Home Enclosures High Pressure Blower Door Systems, Smoke Tracer Unit, Infrared Camera
Pull-off Strength of Adhered weather Barrier ABAA T0002-2019 Weather Barrier Construction Load Cell Pull Tester
Electronic Methods for Detecting and Locating Leaks in Waterproof Membranes D7877, ASTM D8231 Waterproof Membranes High & Low Voltage Electronic Detection Units
Field Test Procedure for Determining Resistance of Roofing Fasteners ANSI/SPRI-FX-1 2021 Roofing Fasteners Construction Load Cell Pull Tester






Zero/Six's outstanding professionalism, along with their high level of expertise, has consistently equipped our team with the essential resources needed to ensure the successful completion of our projects.

Laura Lara

Senior Project Manager, The University of Texas

Zero/Six has been successfully providing consulting services for projects with the OFPC South Texas Region for over 8 years, I would not hesitate to recommend and consider them for any future endeavors.

Patrick Lew

Senior Project Manager, The University of Texas

Zero/Six's dedicated staff and ongoing contributions significantly enrich our team, ensuring the delivery of top-quality buildings. We wholeheartedly welcome Zero/Six's involvement in any project.

Mark Kimball

Project Manager, The University of Texas