KEE-Stone Utility Roll is a 60-mil, six-inch wide, reinforced thermoplastic membrane enhanced with Dow ELVALOY™ HP. This unique Ketone Ethylene Ester (KEE) formula creates a material with superior flexibility. KEE-Stone Reinforced Utility Roll features a dual-sided membrane—bright white on one side and medium gray on the other—giving you the flexibility to choose the best surface for your project. The roll is smooth for easy heat welding installation for field detailing of penetrations. KEE-Stone Utility Roll is designed as the stripping ply to cover a seam in the KEE-Stone Flashing system and KEE-Stone membrane system. It can also be used to field wrap unusual penetrations where a pre-molded accessory will not work.