Stego Mastic - Seal Pipe Penetrations & Terminating Edges

When vapor barriers meet pipe penetrations or terminate at foundation walls, you need a reliable seal that bonds to polyethylene sheeting. Stego Mastic provides that connection, creating an airtight barrier where standard tape won't hold. This single-component sealant adheres directly to Stego Wrap and similar vapor barriers, sealing around plumbing pipes, electrical conduits, and mechanical penetrations that pass through your slab. Apply it along termination points at grade beams, pile caps, and vertical foundation transitions where moisture infiltration typically occurs. The mastic remains flexible after curing, accommodating minor substrate movement without cracking or losing adhesion. Each container covers multiple penetrations depending on pipe diameter and application thickness. Built for concrete contractors installing complete below-slab vapor barrier systems on commercial and residential projects.