GCP logo 2022

GCP, a Saint-Gobain company, is a leading provider of building materials that includes GRACE ICE & WATER SHIELD®, PERM-A-BARRIER®, BITUTHENE®, and PREPRUFE®. The GCP portfolio of residential and commercial products are tailor-made for different environments and uses so builders have the best options available for their specific application. As part of the Saint-Gobain Group, GCP’s residential portfolio works cohesively with CertainTeed’s innovative and sustainable building products to provide more versatile solutions to customers. With products that last longer and make construction—and the manufacturing of its materials—more energy-efficient and less wasteful, GCP makes a tangible difference on the carbon footprint of our planet. GCP is focused on continuous improvement for its customers, end-users, and the environment.




Construction + Engineering


Iltaz Alam

Iltaz Alam is a product manager at GCP and holds a Chemical Engineering degree. Iltaz has over 15 years of waterproofing experience globally and has worked with several liquid applied waterproofing technologies throughout his professional career.

Greg Austin

Greg Austin is the global product director, specialty building materials, for GCP Applied Technologies. Based in Cambridge, Massachusetts, he has a background in consulting and more than five years of experience in waterproofing system development and construction materials.

Xia Cao

Xia Cao is principal scientist at GCP Applied Technologies. She has more than 12 years of experience in waterproofing system and building materials development, and more than 20 years in material science and process engineering. Cao holds a PhD in chemical engineering and has produced more than 20 technical publications, 10 published patents, and five pending patent applications.

Brian Chang

Brian Chang is senior manager of residential product management at GCP. He has a demonstrated history of delivering revenue, profitability and growth within diverse industries and work environments. Chang is responsible for the performance of a team of product managers and the execution of key portfolio, profitability, and business initiatives across the range of GCP’s specialty building materials product lines.

Abby Feinstein

Abby Feinstein is director product management and marketing for commercial buildings and infrastructure at SAINT-GOBAIN: CertainTeed & GCP Brands. She is responsible for aligning the commercial building and infrastructure product portfolio with North American market values and business strategy. Prior to joining CertainTeed, Feinstein helped start several businesses in the renewable energy and energy efficiency sectors. In addition to product management, she’s directed sales and marketing divisions and operated her own home performance consulting business.

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