Manhole Rehabilitation | Perma-Liner Industries LLC.


manhole rehabilitation system


The Perma-Liner™ CIPMH™ (cured-in-place manhole liner) is a unique one piece liner made to fit all manholes including; barrel sections, eccentric and concentric cones constructed of brick and mortar, pre-cast or block. The CIPMH™ for Chimney or Full Depth Manhole Lining eliminates infiltration and inflow through manhole walls. This universal sized manhole liner is engineered to resist freeze-thaw cycles and create a water-tight, corrosion resistant structural lining.

Manhole Rehab Before and After
Manhole Rehabilitation Process Step 1
Manhole Rehabilitation Process Step 2
Manhole Rehabilitation Process Step 3
Manhole Rehabilitation Process Step 4
Manhole Rehabilitation Process Step 5
Manhole Rehabilitation Process Step 6


When the crew arrives on-site, the manhole is prepared by pressure washing, sand blasting and filling large voids. The manhole depth is measured and the technicians cut the liner from a bulk roll to match the depth of the manhole. A specific amount of resin is mixed and introduced into the liner under a controlled vacuum impregnation process. The liner tube has the ability to stretch and accommodate barrel sections while adapting to an eccentric or concentric corbel section of a manhole. A special retaining ring is attached at the upper end of the liner tube and used to hold the liner while it is suspended in the manhole. The liner is fed by hand and inverted through the center of the retaining ring until the liner is fully turned inside out and positioned within the manhole. The inflation device is inserted within the manhole liner. Pressure is applied causing the one-size liner to conform to the manhole. The liner is cured at ambient temperatures typically within two hours from mixing and can be installed during cold winter months as well as warm summer months. Manhole rehabilitation is made simple by a two to three man crew. The inflation device is removed and the manhole liner is trimmed at the top of the manhole casting flush with the casting lid seat. The installation is finished creating a new structural manhole.