Manhole Skirt

External filter fabric skirt for manhole connections
Custom Fitted Pipe Protection for Pipe Connections to Manhole Structures

MarMac Geotextile Manhole Skirts prevent leaching and infiltration of subgrade material through openings that might occur at the connection of the pipe and the manhole wall. Geotextile Manhole Skirts are a cost effective and permanent measure of protection against expensive and frustrating damage. Geotextile Manhole Skirts are manufactured using specially engineered, high strength fabric designed to hold soil and fines in place. Geotextile Manhole Skirts meet most DOT materials standards.

Geotextile Manhole Skirts are easily installed and permanent
when backfilled. The skirts help to limit liability by minimizing the chances of failure at the pipe to manhole connectiont. They are cost effective and uniquely designed for quick and easy installation, and the closure system allows for infinite adjustment.

Features & Benefits
  • Reduces liability & the need for costly repairs
  • Provides permanent protection
  • Cost effective & easily installed
  • Closure system allows for infinite adjustments
  • Eliminates entry of subgrade material
  • Economical protection
Geotextile Manhole Skirt Graphic
Geotextile Manhole Skirts meet or exceed the material requirements of ASTM D4632, ASTM D4833, ASTM D3786, ASTM D4533, ASTM 4355, ASTM D4751, and ASTM D4491, as shown in the Typical Properties table.
Grab Tensile 160 lbs ASTM D4632
Grab Elongation 50 % ASTM D4632
Puncture Strength -85 lbs ASTM D4833
Mullen Burst 280 psi ASTM D3786
Trapezoidal Tear 60 lbs ASTM D4533
UV Resistance 70 % ASTM D4355
Apparent Size Opening 70 US Sieve ASTM D4751
Permittivity 1.30 sec-1 ASTM D4491
Water Flow Rate 110 gpm/ft2 ASTM D4491

Extend and position the top of the Geotextile Manhole Skirt (A) and the sleeve of the skirt so the sleeve (D) will cover and overlap the circumference of the pipe. Position the long strap (B) and secure to the top of the skirt on the manhole/structure. Straighten and extend the skirt sleeve (D), overlap and secure the hook fastener (C) around the pipe. Apply tension to the shorter strap (and lock) around the pipe barrel approximately 2 inches from the end of the fully extended skirt sleeve (D). When back-filling, maintain skirt positioning. The sides and bottom of the skirt should be fully extended and in direct contact with the pipe and structure wall.


Inlet Pipe Sizes: 6-60”


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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.