401 Arctic Seal® is a specially designed and manufactured, self-adhering, NEX™ SBS polymer modified asphalt underlayment for use on steep slopes to prevent moisture intrusion from ice dams and wind-driven rain, as required by many building codes. Arctic Seal® serves a dual role as a flashing membrane, helping protect areas susceptible to leaks such as valleys, roof-to-wall transitions, and around vents and skylights. Arctic Seal® is approved for use under fire-rated, code-compliant roof coverings and as a vapor retarder in various FM Approved roofing assemblies. Consult Malarkey’s Technical Services Department for approval of roof systems.

Arctic Seal® is manufactured on a non-woven fiberglass mat with a NEX™ SBS polymer modified bitumen (asphalt) top coating and surfaced with a sand release agent. The underside has an aggressive asphalt-based adhesive, protected with a factory-applied, split-release film that is removed prior to installation.