This product consists of a resilient, non-woven glass fiber mat, which is permeated and coated with SBS modified bitumen to a thickness. This sheet is covered with finely divided mineral matter on its top while a silicone treated release film, which is easily removed during application, protects its self-adhesive backing. Used primarily for waterproofing purposes under shingled roofs and specifically beneath potential ice dam areas, it can also be installed around vent stacks, dormers, chimneys and other roof-top structures.