Duradek Ultra is intended for use as both a roof covering and a traffic surface, making it a good choice for residential decks built above living spaces.
Duradek Ultra is intended for use as both a roof covering and a traffic surface, making it a good choice for residential decks built above living spaces.

Most of the single-story bump-out additions we build have pitched roofs, though under the right circumstances it’s not hard to add a flat rooftop deck to the design. That was the case with the job shown here — a 6-foot-by-20-foot kitchen expansion with a master bedroom roof terrace above. In the past we’d used asphalt-based or single-ply rubber roofing membranes for flat-roof jobs, then covered the roofing with deck boards. But for this project, the architect specified Duradek, a PVC thermoplastic waterproof deck membrane (800/338-3568, duradek.com).

Originally developed in the 1960s as a slip-resistant flooring for small boats, Duradek was later introduced as a roofing material, first in Canada and then in the United States. In the manufacturing process, PVC is pressed through rollers into a thin film that is then laminated to a woven polyester fabric for stability and multidirectional...

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