Grouting & Lining
Lining is an excellent remedy for structural issues in deteriorating pipe, but lining sewer pipes will NOT stop existing infiltration. In fact, many contractors grout leaking joints prior to lining in order to prevent resin wash-out or bubbles in the liner which may compromise the integrity of the liner and decrease the capacity of the pipe.
Additionally, after the liner is installed, holes are cut in the liner in order to reinstate the lateral connections which allows water flowing in the annular space between the host pipe and the liner to enter the system. Using water-thin chemical grout will permanently seal the annulus as well as seal the lateral connection and stabilize the soil outside the lateral connection.
In sub-grade structures, such as manholes, most linings cannot be applied to a wet surface, therefore chemical grouts are used to stop the infiltration prior to coating the surface.