Standard Industries and GAF announced the appointment of John Barkhouse as CEO of GAF, effective Jan. 1, 2026. Current CEO John Altmeyer will transition to the role of executive chairman of GAF at that time.

“I’m thrilled to take on this role and grateful to David Winter, David Millstone, John Altmeyer and the entire GAF team for their partnership and support,” said Barkhouse. “We have a powerful platform and extraordinary talent, and I’m excited to continue building on our leadership position in the industry.”

Since joining GAF as president last year, Barkhouse has led manufacturing, supply chain, and R&D for GAF’s Residential and Commercial divisions. Previously, he spent more than 25 years in manufacturing and operational leadership roles in the industrial, energy and services sectors. 

“John Barkhouse is a world-class operator with a hands-on approach, a strong understanding of the business and a proven track record of driving operational excellence,” said David Winter and David Millstone, co-CEOs of Standard Industries. “His focus on continuous improvement, standardization, safety and culture has already had a tremendous impact on the business, and we are excited for him to lead the company in its next chapter.

“We are tremendously grateful to John Altmeyer for his extraordinary leadership and vision," Millstone and Winter added. " He has transformed GAF by growing the commercial business into an industry leader and optimizing the residential business, all while building upon GAF’s best-in-class service, product innovation and focus on customer relationships.

"John Altmeyer and John Barkhouse have been working in close collaboration in advance of the transition, and we are confident the change will be steady and seamless.”

Altmeyer joined GAF in 2021 as executive chairman of the Commercial Business and was appointed CEO of GAF in 2023. During his tenure, GAF experienced growth and made investments in new commercial plants in Valdosta, Ga., and Peru, Ill. as well as a new residential plant in Newton, Kan. He also oversaw the integration of GAF and GAF Energy, GAF’s solar roofing business unit.

“John Barkhouse is a collaborative, strategic leader who has gotten to know our business and our people, and I couldn’t be more confident that he is the right person to serve as the next CEO of GAF,” said Altmeyer. “It has been the honor of my career to lead this company, and I look forward to continuing to support John and the team in all that’s to come.”