from $23.25 /gauge
from $23.25 /gauge


Because it is at risk of freezing, Stego Mastic cannot be transported through low temperatures for extended periods of time.

To schedule delivery that reduces freezing risk, please use the button below to quote your purchase:


Product Specifications


Stego® Mastic is a liquid-applied vapor retardant membrane, designed to be used in conjunction with StegoHome® vapor barriers and retarders to create a quality installation that greatly resists the ingress of moisture and other gases. It can be used for sealing utility, pipe penetrations, and terminating edges when used in conjunction with Stego® Tape or StegoTack® Tape.


- 20-ounce sausage tubes

- One case of STEGO Mastic contains 12 sausages

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


  • 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

Additional Benefits

  • Alternative to boots for pipe penetrations in StegoHome®
  • Quickly seals around penetrations, especially pipe clusters
  • Certified Low-VOC Emissions (Certified Clean Air GOLD)