One-Size-Fits-All Manhole Liner Forms Freeze-Resistant, Watertight Seal

One-Size-Fits-All Manhole Liner Forms Freeze-Resistant, Watertight Seal
Perma-Liner Industries

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The one-piece, cured-in-place manhole liner from Perma-Liner Industries is made to fit all manholes, including barrel sections, eccentric and concentric cones constructed of brick and mortar, precast or block.

Manhole chimneys, accessed through the manhole cover, can be rehabilitated without excavation. The one-piece, stretchable, absorbent textile liner is impregnated on site with a silicate-based, thermoset resin. Lowered into position, the liner is pressed against the existing structure using a pressurized installation bladder. Once cured, the liner can be trimmed flush with the manhole cover seat.

“The material comes in rolls, so once you calculate the depth of the manhole, you simply cut the material to fit your specific job length,” says Morgan Trouard, Perma-Liner’s director of marketing.

Prior to installation, manholes must be cleaned using a pressure washer with a minimum of 5,000 psi at 5 gpm. Structures can also be cleaned using abrasive blasting. A grinder or sandblasting can be used to clean the castings. Large voids require the use of hydraulic cement. Smaller voids and missing mortar can go unpatched.

The liner, which can be installed by a team of two, cures in about two hours. Engineered to resist freeze-thaw cycles, the liner creates a watertight, corrosion-resistant seal that eliminates infiltration and inflow and can withstand hydrostatic pressures.

The polyester resin and catalyst have a six-month shelf life when stored in a cool, dry area away from direct sunlight. Resin is available in 5-gallon pails or 55-gallon drums.

“It’s a turnkey system,” Trouard says. “There’s no need for any additional specialty equipment or tools.” 866/336-2568;


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