Our brands provide complete building solutions for the residential and commercial markets

In November 2018, Ply Gem Building Products and NCI Building Systems merged together to become the single largest manufacturer of exterior building products in North America.

Better together, the combined organization offers unparalleled expertise in creating products and solutions for the commercial and residential construction industries and delivers on decades of experience serving customers and communities across North America.

Since 1984, NCI Building Systems has grown through strategic mergers and acquisitions. Now part of Cornerstone Building Brands, the organization continues to design, manufacture and deliver a comprehensive range of products for the commercial construction industry—from metal coatings to components, and from insulated metal panels to engineered building systems.

For over 75 years, Ply Gem Building Products has been a pioneer in the residential construction industry, and it continues to lead through innovation. Ply Gem’s comprehensive range of building products includes nearly everything on the outside of a home: from windows, doors and siding to designer accents, stone veneer, roofing and fence and rail.

All of Ply Gem and NCI’s commercial and residential building brands will continue to go to market through their existing names, and the company will continue to leverage the Ply Gem endorsement across our residential product categories. Moving forward, the NCI Building Systems brand name will be replaced by Cornerstone Building Brands.

Who We Are Side Image

What we do

  • Residential Solutions Image

    Residential Solutions

    Cornerstone Building Brands delivers a comprehensive range of residential exterior products to help create beautiful homes of different sizes and styles throughout the communities we serve.
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  • Commercial Solutions Image

    Commercial Solutions

    From hospitals to hotels to offices and stadiums, Cornerstone Building Brands offers a wide variety of commercial building solutions that enable communities to grow and thrive.
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Our Purpose

Our building solutions are the cornerstone of the communities we serve. We believe every building we create, and every part of that building, positively contributes to communities where people live, work and play.

Our Mission

We are relentlessly committed to our customers and to creating great building solutions that enable communities to grow and thrive. By focusing on operational excellence every day, creating a platform for future growth and investing in market-leading residential and commercial building brands, we deliver unparalleled financial results.

Our Core Values

Safety is an essential part of our culture. We approach each day with careful attention to the well-being of every individual. From the moment we leave home to the time we return, we take personal responsibility for our safety and the safety of those around us.


We challenge the status quo and proactively seek opportunities for continuous improvement and transformative breakthroughs. We develop products and solutions to meet our customers’ evolving needs and improve communities through our commitment to environmental sustainability.


We are honest and accountable in our actions with one another and with all our stakeholders, and we strive to build trust at every opportunity. Our commitment to doing what’s right underscores everything we do each day.


We work side by side to create an environment of collaboration and mutual respect. Our backgrounds are as varied as our talents, and we stand together as one winning team whose diversity reflects the communities we serve.