Ply Gem Holdings, Inc. manufactures and sells residential and commercial building products in the United States and Canada. It operates in two segments: Siding, Fencing, and Stone; and Windows and Doors. The Siding, Fencing, and Stone segment offers vinyl siding and skirting, steel siding, vinyl and aluminum soffit, aluminum trim and gutter coil, fabricated aluminum gutter, aluminum and steel roofing accessory, cellular polyvinyl chloride trim and moulding, J-channel, wide crown molding, window and door trim, F-channel, H-mold, fascia, undersill trim, outside/inside corner post, rain removal system, vinyl fence and railing, engineered slate and cedar shake roofing, and stone veneer products. It also provides injection molded designer accents, such as shakes, shingles, scallops, shutters, vents, and mounts. This segment sells its products to the new construction, and home repair and remodeling sectors primarily under the Variform, Napco, Mastic Home Exteriors, Mitten, Ply Gem/Cellwood, Durabuilt, Ply Gem Trim and Mouldings, Ply Gem, Canyon Stone and Ply Gem Stone, Ply Gem Roofing, Leaf Relief, Leaf Relief Snap Tight, Leaf Smart, and Leaf Logic brands; and the Georgia-Pacific brand through a private label program. The Windows and Doors segment offers vinyl, aluminum-clad vinyl, aluminum, wood, and clad-wood windows and patio doors; and steel, wood, and fiberglass entry doors for the new construction, and home repair and remodeling sectors under the Ply Gem Windows, Simonton Windows, Great Lakes Window, and Ply Gem Canada brands. It sells its products to the new residential and light commercial construction through independent building material dealers, regional/national lumberyard chains, builder direct/OEMs, and retail home centers; and independent home improvement dealers, one-step distributors, and big box retail outlets. The company was incorporated in 2004 and is headquartered in Cary, North Carolina. Ply Gem Holdings, Inc. is a subsidiary of CI Partnerships.