Butyl Wrap
(C877 Type III)

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

MarMacʼs Butyl Wrap (C877 Type III) is an extremely flexible butyl joint wrap designed to provide a permanent, watertight barrier against infiltration and exfiltration. MarMac Butyl Wrap aggressively bonds to the surface of concrete as well as metal. Butyl Wrap consists of an impervious polyethylene film which has been laminated to a 50 mil aggressive butyl mastic to create a waterproof seal.

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, or other chemical solvents. Clean, dry surfaces are required for proper installation.

MarMac Butyl Wrap C-877 Type III Graphic
Features & Benefits
  • Broad temperature range performance
  • High tack & permanently flexible
  • Fast & easy installation
  • Long-term durability
  • Excellent adhesion & formability
  • Saves time & labor
HDPE 6″ (150 mm) 0.050″ 100′ (30.5 m)
EPDM 6″ (150 mm) 0.030″ 100′ (30.5 m)
EPDM 9″ (225 mm) 0.030″ 100′ (30.5 m)
HDPE 12″ (300 mm) 0.050″ 50′ (15.25 m)
EPDM 12″ (300 mm) 0.030″ 50′ (15.25 m)
HDPE 14″ (355 mm) 0.050″ 50′ (15.25 m)

MarMac Butyl Wrap meets all requirements of ASTM C877, Type III.

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

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 wet installation conditions or when temperatures are below 40°F (4°C), MarMac recommends the use of RB Adhesive Primer for increased adhesion.


Roll widths: 6, 9, 12, 14″
Roll lengths: 50, 100′
Thickness: 0.05″, 0.03″
Backing: HDPE, EPDM


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
Junction Boxes

Butyl Wrap
(C877 Type III) Requests

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(C877 Type III), fill out the form below.

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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.

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