LionGuard is used as a shingle underlayment on critical roof areas such as eaves, ridges, valleys, dormers and skylights. This underlayments protect roofing structures and interior spaces from water penetration caused by wind-driven rain and ice dams. LionGuard may also be used as covering for entire roof to prevent moisture or water entry. LionGuard is a flexible rubberized asphalt, fiberglass-reinforced membrane with a granular surface that provides maximum skid resistance during installation.