Butyl Wrap
(C-877 Type III)

External, butyl water-proofing wrap for concrete joints.
Flexible Butyl Membrane for Precast Concrete and Metal Joints

MarMac Butyl Wrap (C-877 Type III) is an extremely flexible butyl joint wrap designed to provide a permanent barrier against infiltration and exfiltration. MarMac Butyl Wrap aggressively bonds to the surface of concrete and metal. Butyl Wrap consists of an impervious polyethylene film which has been laminated to a 50 mil aggressive butyl mastic to create a watertight seal. MarMac’s Butyl Wrap (C-877 Type III) high flexibility makes it easily formable to fit irregular shapes and surfaces.

MarMac Butyl Wrap should not be used in conditions where it may come into direct contact with petroleum distillates such as gasoline, oil, kerosene, diesel oil, or other chemical solvents. Clean and dry surfaces are necessary for proper installation of this product.

Features & Benefits
  • Broad temperature range performance
  • High tack & permanently flexible
  • Fast & easy installation
  • Long-term durability
  • Excellent adhesion & formability
  • Saves time & labor
MarMac Butyl Wrap C-877 Type III Graphic
HDPE 6″ (150 mm) 100′ (30.5 m)
EPDM 6″ (150 mm) 100′ (30.5 m)
HDPE 9″ (225 mm) 100′ (30.5 m)
EPDM 9″ (225 mm) 100′ (30.5 m)
HDPE 12″ (300 mm) 50′ (15.25 m)
EPDM 12″ (300 mm) 50′ (15.25 m)

MarMac Butyl Wrap (C-877 Type III) meets the requirements of ASTM C 877 Type III.

Store material in original, unopened packaging at temperatures between 40-110°F (4-43°C). Shelf life is 12 months when stored as recommended.

Color Black Visual
Base Polymer Butyl N/A
Brittleness Temperature -50°F (-46°C) ASTM D 2137
Service Temperature -50-150°F (-45-65°C) N/A

All bonding surfaces should be clean, dry, and free of dirt, dust, debris, oils, and other contaminants. Do not stretch the sealant tape during application. Make sure to overlap the tape ends at least twice the tape width. Roll the tape to ensure good contact with the substrate.

When confronted with difficult installation conditions, such as wet conditions or when temperatures are below 40°F (4°C), priming the concrete will improve the bonding action.


6″, 9″, & 12″ width rolls
HDPE or EPDM backing
*See sizes & configurations table


Manhole Joints
Grade Ring Joints
Irrigation & Drainage
Box Culverts
Elliptical/Arch Pipe
Utility Vaults
Architectural Foundations Stormwater Structures Treatment Tanks
Wet Wells
Concrete Bridge Spans

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(C-877 Type III) Info

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*All statements and technical information are based on tests and/or data which MarMac Manufacturing deems reliable, however, MarMac does not warrant or guarantee the accuracy or completeness of such information. Please read further manufacturer liability and warranty information.