In stock


STEGO MASTIC cannot be transported through low temperatures because it will freeze. Liquid-applied products cannot be returned. If you believe your order may need to be transported through freezing temperatures, please delay purchase and contact your local 475 representative .
Regular price $39.14


Stego® Mastic is a liquid-applied vapour retardant membrane, designed to be used in conjunction with StegoHome® vapour 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.

Physical Properties

  • Tensile/Elongation, ASTM D412: 32 psi, 3860%
  • Resistance to Decay, ASTM E154: 10% perm loss
  • Permeance, ASTM E96: 0.08 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)
  • Sold in single 20-ounce sausage tubes
  • To receive one full box, add 12 sausage tubes to the cart