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STEGO® MASTIC

Strong, Flexible, and Vapor Resistant

 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:

  • Time-saving aid in achieving an ASTM E1643 installation
  • Sausage Tube feature allows for Stego Mastic to be used with a mastic applicator (sausage) gun, for a more precise application
  • Ideal for sealing multiple pipe penetrations in close proximity and small pipe penetrations
  • Water-based, trowel-grade asphaltic emulsion
  • Made in the USA

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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):  

    • ASTM D412: Standard Test Method for Vulcanized Rubber and Thermoplastic Elastomers Tension
    • ASTM E154: Standard Test Methods for Water Vapor Retarders used in Contact with Earth under Concrete Slabs, on Walls, or as Ground Cover
    • ASTM E96: Standard Test Methods for Water Vapor Transmission of Materials
    • ASTM D751: Standard Test Methods for Coated Fabrics
    • ASTM C836: Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for use with Separate Wearing Course
    • ASTM E1643: Standard Practice for Installation of Water Vapor Retarders used in Contact with Earth or Granular Fill under Concrete Slabs

Physical Properties:

    • Tensile/Elongation, ASTM D412: 32 psi, 3860%
    • Resistance to Decay, ASTM E154: 10% perm loss
    • Permeance, ASTM E96: 0.17 perms
    • Hydostatic Water Pressure, ASTM D751: 28 psi
    • Adhesion to Concrete & Masonry, ASTM C836: 7 lbf/in2
    • Hardness, ASTM C836: No cracking
    • Low Temp Flexibility, ASTM C836: No cracking

Additional Benefits:

    • Alternative to boots for pipe penetrations in Stego Wrap and StegoHome Wrap
    • Quickly seals around penetrations, especially pipe clusters
    • Easy application from sausage tubes with a standard sausage gun and/or from pails by brush, roller, or trowel
    • Available nationwide

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.

Stego-Tape-Thumb

Stego Tape

A low permeance tape designed for use...

Details
Stego Mastic

Stego Mastic

A liquid applied vapor retardant membrane...

Details
Crete-Claw-Tape

Stego Crete Claw Tape

A multi-layered tape...

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StegoTack-thumbnail

StegoTack

A double-sided adhesive strip used to bond...

Details
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