Stego Mastic is a liquid-applied vapor retardant membrane, designed to be used in conjunction with Stego Wrap 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. Stego Mastic is available in 2-gallon or 5-gallon pails, and in 20-ounce sausage tubes for repairs and small installations.
Manufactured by Stego, Stego Mastic provides contractors and building professionals with a dependable solution for maintaining the continuity of vapor barrier systems. Its strong adhesion, flexible sealing properties, and long-term moisture resistance make it an essential product for high-performance concrete slab and foundation construction.
- 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