www.floortrendsmag.com/articles/82662-u-s-gypsum-s-underlayment-suitable-as-a-finished-floor
U.S. Gypsum's underlayment suitable as a finished floor
September 17, 2002

U.S. Gypsum Co.'s Levelrock brand floor underlayment Proflow
Levelrock Brand Floor Underlayment ProFlow, new from the Industrial Products Division of United States Gypsum Co., is a high-strength gypsum underlayment that can be used as a decorative finished floor in retail, office and other heavy-use commercial applications.
The self-leveling product delivers a compressive strength range of 6,000 to 8,000 psi while providing a smooth, hard underlayment surface over concrete slabs, pre-stressed concrete or concrete planks, the company says. Levelrock can be covered with a variety of floor coverings, and will not flake or powder, U.S. Gypsum says.