Tufdek is designed for use as a waterproof walking surface on decks and patios, including rooftop decks. Installation (by authorized dealers only) includes filling surface imperfections with Tuff-Patch and bonding the membrane to the deck with a proprietary adhesive. The 66-mil membrane has four layers—two PVC films, a reinforcement ply, and a 6-mil Scuff-Guard wear layer on top—and comes in 11 solid and patterned surfaces. The company says it is burn- and flame-resistant, is UV-stabilized, and has biocides that help prevent mold and mildew. Tufdek, 877.860.9333, tufdek.com