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.
Specification | Details |
---|---|
Permeance rating (ASTM E96) | 0.08 perms |
Tensile strength (ASTM D412) | 87 psi |
Elongation (ASTM D412) | 1800% |
Adhesion to concrete (ASTM C836) | Exceeds |
Shore hardness (ASTM C836) | 75 |
Crack bridging (ASTM C836) | Exceeds |
Low temp flexibility (ASTM C836) | No cracking |
VOC content | <16 g/L |
Storage temperature range | 40°F to 100°F |