Your Friend in the Business. Founded in 1947, Alside manufactures vinyl, aluminum and steel siding, soffit and accessories, vinyl windows, and vinyl patio doors. Starting with the invention of baked-on enamel aluminum siding—the inspiration for its name—Alside solutions serve the residential and commercial remodeling and new construction markets. With headquarters in Cuyahoga Falls, Ohio, Alside has more than 3,000 employees in its 10 manufacturing facilities. Alside products are distributed through a network of more than 100 Alside Supply Centers and select independent distributors across the country. Alside is a division of Associated Materials, LLC.