Johns Manville JMCleanBond® SBS Utility Sheet is a modified bitumen sheet incorporating the features of a strong fiber glass mat with a blend of SBS rubber, high-quality asphalt and fire-retardant additives. The elastomeric asphaltic blend has full recovery properties after 100% elongation and lends elasticity and flexibility to the sheet. The inorganic fiber glass reinforcement provides tensile strength, dimensional stability and toughness to the sheet and resists moisture absorption. These properties also afford the sheet better natural resistance to the other factors that affect roof performance. The covering layer of ceramic-coated roofing granules provides durability along with superior resistance to damage from weather and foot traffic.