Butyl Rubber Tape.

Butyl tape provides a protective barrier against the moisture and condensation that seeps through the decking boards when it rains or snows, keeping your wood stronger for the long runButyl/Sealant Tape designed for side and end lap sealing of metal panels, roof vents and pipe flashing, Butyl/Sealant tape provides optimum sealing in harsh environments and adheres to most clean dry metal surfaces and does not harden, bleed or stainButyl sealants are elastomer-based (polyisobutene) plastic sealants (sometimes called butyl rubber) used for sealing applications due to their excellent resistance to UV, moisture and ageing. Unlike other types of sealant, butyl sealant sealant does not cure (i.e. its properties do not change over time).