GAF Announces New Specialty Products and Services Business Unit

Abdallah Simaika to Succeed Dunlap as President of SGI

PARSIPPANY, NJ & HAGERSTOWN, MD – September 3, 2025 – GAF, North America's largest roofing and waterproofing manufacturer, today announced the creation of a new business unit, Specialty Products and Services—bringing together three essential parts of the roofing supply chain: granules, glass mat and transportation. Justin Dunlap, who previously served as the President of SGI, has been appointed President of the Speciality Products and Services business. SGI also announced today that Abdallah Simaika will succeed him as President of SGI.

Specialty Products and Services will include SGI, Standard Logistics and Glass Mat operations, which will all continue to operate autonomously, while collectively benefiting from stronger vertical alignment, the potential for new growth opportunities and the ability to deliver a one-stop-shop customer experience.

"Our new Specialty Products and Services division will enhance customer value and drive continuous improvement across the supply chain, and we are confident that Justin’s decades of experience make him the ideal leader for the business,” said John Barkhouse, President and Incoming CEO of GAF. “Abdallah has demonstrated an unwavering commitment to customers, and we believe SGI is well-positioned for its next phase of growth under his leadership.”

Over his 26-year tenure at SGI, Dunlap has led the transformation of the organization’s business model from focusing solely on roofing solutions to becoming a multifaceted company that manufactures roofing, building materials, and agricultural products.

Justin Dunlap said, “I am thrilled to take on an expanded role, bringing the same level of customer service and commitment to quality that SGI is known for to Standard Logistics and Glass Mat. I look forward to working closely with Abdallah, and I am confident the transition will be seamless for our valued customers.”

Since 2017, Simaika has served in a number of leadership roles across Standard Industries, the parent company of GAF and SGI, including most recently as a member of the executive leadership team at GAF. Previously, he spent more than a decade in senior M&A and business development roles across the finance, healthcare, and legal industries.

"I am incredibly excited to lead the talented team at SGI," said Abdallah Simaika. "Since Justin joined SGI, the company has built a strong reputation for quality, operational excellence, and reliability. We will continue to build upon this success while unlocking new avenues for innovation and value creation for our customers."



About GAF
GAF, a Standard Industries company, is the leading roofing and waterproofing manufacturer in North America. For more than 135 years, GAF has been trusted to protect what matters most for families, business owners and roofing professionals with its innovative solutions and focus on exceptional service. GAF's leadership extends to its commitment to strengthen its communities and industry through investments in career development, sustainable products, and local community resilience. Learn more at www.GAF.com.

About SGI
SGI, a Standard Industries company, is a leading mining and mineral processing company specializing in the development of roofing products, building materials, and the deployment of metabasalt on farmland for permanent carbon removal. Headquartered in Hagerstown, Maryland, SGI has six production plants powered by more than 650 employees who are committed to delivering the exceptional quality and service customers have come to expect for decades. For more, visit: www.specialtygranules.com.