Stego Mastic is a vapor-retardant membrane formulated for use with both Stego® Wrap and StegoHome® Wrap Vapor Barriers/Retarders. It is ideal for sealing around utility and pipe penetrations, particularly in areas where multiple penetrations are located in close proximity. Stego Mastic provides a durable and flexible seal, helping maintain the integrity of the vapor barrier system across a variety of jobsite conditions. Stego Mastic is available in 2-gallon or 5-gallon pails, and in 20-ounce sausage tubes for repairs and small installations.
Its many features include:
Stego Mastic is a water-based, medium-viscosity, polymer-modified anionic asphalt emulsion. It can be used to seal permanent penetrations of both Stego Wrap and StegoHome Wrap quickly and easily, especially small pipes, between pipe clusters, and terminating edges.
APPLICABLE STANDARDS American Society for Testing & Materials (ASTM):
Physical Properties:
Additional Benefits:
Stego has the accessories you need to complete an ASTM E1643-compliant installation. Stego Tape, Stego Mastic, Stego Crete Claw Tape and StegoTack Tape enable efficient vapor barrier installations, saving time and resources.