TL-0006 - UL Approval Class A Fire Rating Technical Letter
Bituthene® 3000 Membrane, Bituthene® Low Temperature Membrane and/or Bituthene® System 4000 Membrane carry the Underwriters Laboratory Class A Fire Rating (Building Materials Directory, File #R7910) when used in either of the following constructions:
- Limited to noncombustible decks at inclines not exceeding 0.25 in. (6 mm) to the horizontal 1 ft (0.3 m). One layer of Bituthene® waterproofing membrane, followed by one layer of 0.125 in. (3 mm) protection board, encased in 2 in. (50 mm) minimum concrete monolithic pour.
- Limited to noncombustible decks at inclines not exceeding 0.25 in. (6 mm) to the horizontal 1 ft (0.3 m). One layer of Bituthene® waterproofing membrane, followed by one layer of DOW Styrofoam PD Insulation Board [2 in. (50 mm) thick] and covered with one layer of 2 ft x 2 ft x 2 in. (0.6 m x 0.6 m x 50 mm) of concrete paver topping.
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Last Updated: 2021-02-05