Does DensDeck® roof board meet the requirements of UL P-921?
Although UL P-921 is a light-weight concrete listing over a steel deck, 5/8″ DensDeck FireGuard® roof board has been tested in similar constructions by UL and found to be equivalent in fire performance to the assembly tested. For documentation on this equivalency testing, please call our Technical Hotline at 1-800-225-6119 (Monday – Friday 8AM – 5PM ET, except holidays).