Stego Mastic - Seal Pipe Penetrations & Terminating Edges

Stego Mastic - Seal Pipe Penetrations & Terminating Edges

Stego Mastic is a trowel-grade, water-based vapor barrier sealant designed to work with Stego Wrap vapor barriers and retarders. This bituminous/asphalt emulsion is applied to seal pipe penetrations, utility intrusions, and terminating edges, helping to create a continuous moisture and gas barrier in under-slab and foundation applications.

Ideal for use in conjunction with Stego Tape or Stego Tack Tape, Stego Mastic is a time-saving solution that helps meet ASTM E1643 installation standards. It is especially effective in sealing multiple or tightly grouped pipe penetrations and in areas where precise sealing is critical to barrier integrity.

Available in 5-gallon pails for large jobs and 20 oz sausage tubes for repairs or small applications, Stego Mastic can be applied using a trowel or sausage gun, depending on the format. It's made in the USA and is trusted by contractors for dependable, code-compliant vapor barrier installations.

Features

• Seals pipe penetrations and terminating edges in vapor barrier systems.
• Compatible with Stego Wrap, Stego Tape, and Stego Tack Tape.
• Helps meet ASTM E1643 requirements for vapor barrier installation.
• Ideal for multiple or closely spaced pipe penetrations.
• Water-based and low odor for safer jobsite use.
• Available in 5-gal pails or 20 oz sausage tubes.
• Can be applied with a trowel or mastic gun.
• Flexible and durable once cured.
• Supports continuous moisture and gas barrier integrity.
• Made in the USA for consistent quality and availability.