Manhole Rehabilitation

Epoxy Coating

When the manhole structure is badly damaged, Cement Water Stop is first applied to restore an even surface in preparation for the Epoxy coating. Epoxy coating is particularly effective when applied to surfaces suffering from prolonged chemical exposure.

Cement Water Stop

A hybrid cementitious mixture is applied to faults in the manhole to effectively plug gaps in risers and leakage from faulty seals and holes. The mixture can either be sprayed onto the manhole surface or hand applied by trowel. The mortar can be applied up to two inches thick and can be used as a stand-alone repair or to restore the manhole surface in preparation for epoxy coating.

Spin Coat

A concrete mixture is applied through a spray nozzle to evenly coat the interior of the manhole from frame to trough creating a seamless seal.

Gel Grout Leak Stoppage

A hole is drilled through the manhole wall to allow access to the area behind the location where leakage is a problem. A series of solutions are injected through the hole, expanding to form a waterproof barrier and eliminate leakage.


This procedure restores the manhole to the correct surface plane. In addition, defects and infiltration due to faulty risers, chimney and frame are eliminated. After the defective manhole has been cut away, a new chimney is sealed to the cone. The chimney is cut to allow the frame to sit flush with the surface and a quick drying concrete solution creates a tight seal collar.


A cast-in-place concrete liner is designed to rehabilitate existing manholes. Modular forms are constructed inside the manhole structure, then a monolithic concrete pour between the form and the existing wall creates a solid manhole surface. The procedure is quick and requires no interruption of flow.