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J. Bretz is the Founder and CEO of Excel Roofing, bringing over 33 years of experience and leadership in the roofing industry. He leads from the front, setting the standard for quality, integrity, and craftsmanship across every project.
J. Bretz is an Owens Corning Platinum Advisory Board Alumni and a Colorado Roofing Association Board Alumni. Throughout his career, he has earned a reputation as a respected industry leader, committed to excellence and advancing professional standards within the roofing community.
Vice President
Vice President
Henry Bretz was born and raised in Denver, Colorado, and has a strong interest in building businesses and helping teams grow. As Vice President of Excel Roofing, he supports company operations, strategic planning, and overall direction across Colorado and Wyoming.
Henry is a certified roofing professional, credentialed by leading manufacturers and the Colorado Roofing Association (CRA). His certifications include tile roofing systems, low-slope and commercial roofing systems, metal roofing, asphalt shingle roofing, and synthetic roofing materials. His experience supports both residential roof replacement and commercial roofing projects throughout the region.
He can also be heard on 630 KHOW, where he shares roofing insights alongside Tom Martino, helping homeowners better understand roofing systems and contractor expectations.
In addition to his role in operations, Henry contributes to the overall direction.
Outside of work, he enjoys riding his snowmobile in the Colorado backcountry and mountain biking.

“Excel Roofing has been in business for 31 years and looks forward to another 30-plus years under the leadership of Henry Bretz.”
“As of September 2024, Excel Roofing has completed over 45,000 projects and, according to their Owens Corning representative, is the largest buyer of Owens Corning materials in the region.”
General Manager
General Manager
Dominic Herrera is a Colorado native, born in Denver and raised in the Vail Valley, where he developed the strong work ethic and resilience that define his leadership style today.
He began his roofing career in 1999, starting with tar and gravel roofing systems and advancing through commercial roofing, residential roof replacement, framing, windows, siding installation, and full home building. His extensive hands-on experience across both residential and commercial construction gives him a comprehensive understanding of building systems from the structural level up.
At Excel Roofing, Dominic previously served as Production Manager and Sales Manager, strengthening both operational efficiency and revenue growth. He is known for holding high standards of accountability, demanding excellence in workmanship, and leading teams with a results-driven mindset.
Today, Dominic serves as General Manager, overseeing large-scale roofing projects, commercial roofing systems, storm restoration, insurance claim coordination, and internal operations across Colorado and Wyoming. His leadership ensures:
Based out of Excel Roofing’s headquarters in Englewood and residing in Aurora, Dominic directs roofing operations statewide, ensuring every project meets the highest standards for durability, craftsmanship, and long-term performance in Colorado’s and Wyoming’s demanding climates.
Sales Manager
Sales Manager
Brock grew up in Lakewood, Colorado, and graduated from Green Mountain High School before continuing his education on the East Coast, where he played collegiate football at Southern Virginia University. The discipline, leadership, and work ethic he developed as a collegiate athlete now fuel his success in the roofing industry.
Today, Brock serves as the Sales Manager in Denver, Colorado for Excel Roofing. As a roofing expert, he specializes in residential and commercial roofing solutions, storm damage assessments, insurance claim support, and helping homeowners choose durable systems built for Colorado’s demanding climate. His product knowledge and customer-first approach ensure every client receives honest guidance and high-quality results.
Based in Denver, Brock works closely with property owners throughout the Front Range, delivering dependable service, clear communication, and roofing solutions designed for long-term performance.
Outside of work, Brock enjoys spending time with his wife, Holly, and their three daughters. He loves being outdoors in the Colorado mountains, relaxing at the beach when he can, and cheering on the Denver Broncos and Colorado Rockies.

Branch Manager | Sheridan, Wyoming
Sheridan | Buffalo | Gillette
Sheridan | Buffalo | Gillette
Dan began his roofing career in 1982, starting hands-on installing shakes, asphalt shingles, hot tar systems, tile roofing, and commercial roofing systems. With more than 40 years of field experience, he understands roofing from the ground up — because he built his career physically installing the work himself.
Today, Dan serves as Branch Manager of Sheridan for Excel Roofing, leading residential and commercial roofing projects throughout Sheridan, Wyoming. His decades of experience ensure quality craftsmanship, durable roofing systems, and reliable service built to withstand Wyoming’s harsh weather.
Outside of work, Dan is a loyal Raiders fan, a proud pit bull enthusiast, and enjoys traveling to Kauai to snorkel and relax on the beach.
Aurora | Centennial | Denver
Denver | Wash. Park
Applewood | Arvada | Golden | Lakewood | Morrison | Wheat Ridge
Aurora | Castle Rock | Elizabeth| Franktown | Parker
Boulder | Broomfield | Louisville | Superior | Westminster
Arvada | Edgewater | Lakewood | Northglenn| Wheat Ridge
Arvada | Bailey | Cherry Hills Village | Conifer | Wheat Ridge
Aurora | Centennial | Columbine | Denver | Highlands Ranch
Centennial | Cherry Creek | Englewood | Greenwood Village | Lonetree
Aurora | Commerce City | Denver | Federal Heights | Englewood
Westminster | Brighton | Lafayette | Northglenn| Wheatridge |Longmont
Project Manager
Project Manager
Project Manager
Project Manager
Project Manager
Project Manager
Project Manager
Project Manager
Production Manager
Production Manager
Zach is originally from Georgia and now resides in Colorado. He enjoys spending time outdoors, especially along the river, staying active, and spending time with his dog. He also has a strong appreciation for footwear, with a preference for Nike.
Zach brings extensive expertise in production management at Excel Roofing. He oversees the scheduling and coordination of roofing projects across all locations, ensuring each job runs efficiently and on schedule. He is highly knowledgeable in a wide range of roofing systems, including asphalt shingles, various tile systems, and other specialty applications.
Office Manage
Marketing & IT Support
Senior Relationship Specialist
Human Resources
Administrative Assistant
Administrative Assistant
Relationship Specialist
Aurora | Centennial | Denver
Denver | Wash. Park
Applewood | Arvada | Golden | Lakewood | Morrison | Wheat Ridge
Aurora | Castle Rock | Elizabeth| Franktown | Parker
Boulder | Broomfield | Louisville | Superior | Westminster
Arvada | Edgewater | Lakewood | Northglenn| Wheat Ridge
Arvada | Bailey | Cherry Hills Village | Conifer | Wheat Ridge
Aurora | Centennial | Columbine | Denver | Highlands Ranch
Centennial | Cherry Creek | Englewood | Greenwood Village | Lonetree
Aurora | Commerce City | Denver | Federal Heights | Englewood
Westminster | Brighton | Lafayette | Northglenn| Wheatridge |Longmont
Colorado Springs | Fort Carson | Fountain | Pueblo | Monument |Falcon
Production Manager
Office Manager
Accountant
Marketing & IT Support
Supplement Specialist
Insurance Specialist
Human Resources
Administrative Assistant
Administrative Assistant
Administrative Assistant
The Colorado Roofing Association’s goal is to help homeowners, commercial building owners, and managers make informed decisions about replacing and maintaining their roof systems.
Roofing contractors who join the CRA are required to abide by the specific code of ethics. CRA Members pledge to seek to provide the best value possible to consumers and agree to treat all employees fairly and ethically. Members vow to protect the public, abide by all laws, rules and regulations and most of all, take pride in their business.
J. Bretz served as a longtime board member of the Colorado Roofing Association, helping shape standards and professionalism within the industry.
At Excel Roofing, newer team members are required to attend CRA trainings as part of their onboarding process to ensure they understand proper installation standards and best practices. More seasoned team members also participate in and conduct training on materials, systems, and correct installation methods, reinforcing our commitment to ongoing education and craftsmanship.
Colo Radans
Ralitsa Carter
Mary Kimball
Colo Radans
Cindy L
Rick Sturdivant
brian niles
Dustin Sieve
Eric Zietlow
Sonny Romero
ANDREW RODWIN
Kevin Donahue
Ana Kauffman
Andy Dimmen
Taylor Hood
Beth Rogers
Bob Andersen
Mindy Densmore
j snoy
Eric Zietlow
Eric Zietlow
Eric Zietlow
Eric Zietlow
Eric Zietlow
Eric Zietlow
Eric Zietlow

We have proudly held Platinum status for decades and have been a trusted part of the Owens Corning network for years. J. Bretz is a Platinum Advisory Board alumni.
Roughly 70% of roofing companies comparable to Excel Roofing have been acquired by major corporations or sold to outside investors. Excel Roofing has not.
We have had the same leadership and decision-makers in place since day one, allowing us to stay independent, consistent, and accountable to our customers.