At GC Roofing, our mission is to serve people and businesses throughout the state of California by taking care of their roofing needs.

We are dedicated to offering the best roofing systems available to building owners; and are passionate about investing in our employees through training and giving back to our community.

Meet the Team


IOKINA DBA GC Roofing is pleased to announce the advancement of Kristen Patterson as Chief Operating Officer, effective immediately. Ms. Patterson has served as the organization's Project Manager for two years and has over 20 years of commercial property management experience. 

Throughout her career, Ms. Patterson has held management positions within property management companies and corporations such as Disney. She has a proven track record both for being a great leader in both an operating and advisory capacity. 


Her academic endeavors have provided her the knowledge in Business Administration needed to help our organization achieve higher than anticipated sales and marketing goals. We look forward to continuing to work alongside Ms. Patterson in this capacity and know that our customers will continue to experience the same level of excellence that she has brought as the Project Manager. For more information, please contact our office. 


Joshua Thiesen

Chief Executive Officer 


Brandy Thiesen

Chief Finance Officer 

Our New COO

Joshua Thiesen


As a second-generation roofing contractor, Joshua brings the expertise needed on the field to ensure your roofs are in good hands. He works hard to think through each project's variables and is responsible for creating proposals that are fair and equitable for both GC Roofing and our customers.


He demonstrates his leadership as CEO through being a servant to those around him. As a boss, he strives to be compassionate, understanding and fair to each employee. His passion for serving others and dedication to the roofing craft reflects GC Roofing's mission to serve others in the best way that we can. 

Our Story

Joshua along with brother, Josiah, learned the art of roofing at a very young age, thanks to their father, Gerry Thiesen. Gerry mentored and trained others across the country, built a reputable company, and raised three young men with outstanding character. He will always be remembered, and we are so thankful to both him and his wife, Carol Thiesen, for their dedication to this family business. With 35 years of excellence as G & C Enterprises, GC Roofing picked up the baton and has continued the heritage.

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