P3 POLYMERSREHABILITATION INSERTS / EXISTING STRUCTURES
P3’s polymer concrete insert creates a new corrosion-resistant interior system inside a suitable existing manhole—without relying on a thin field-applied coating as the primary barrier.
01 / THE INSERT SYSTEM
Factory-made polymer concrete sections form the new interior wall. Wet-or-Dry Polymer Grout (WDP) bonds and seals key interfaces, while field work completes the bench and invert, annular space, and new top connection.
Illustrated system arrangement—not a project shop drawing.02 / PROJECT FIT
The insert is fabricated around documented field conditions. Before it is selected, the project team must confirm that the existing wall, base, access, geometry and pipe interfaces can support a practical installation and finished system.
Evaluate an existing structureGeometryInside diameter, depth, taper, offsets and available annular space.
ConditionWall and base deterioration, loose material and remaining structural role.
InterfacesPipe locations, bench and channel, frame or hatch, and finish elevation.
Field planBypass, access, cleaning, lifting, grout placement and return to service.
03 / FIELD SEQUENCE
The sequence is intentionally close to familiar precast work. Actual duration depends on bypass, site access, condition, depth and project requirements.
Remove the cone or lid, establish required protection, pressure-wash the structure and remove loose material.
CRITICAL INTERFACEThe bench and invert must be clean enough for the WDP system to bond.Use the supplied fiberglass and WDP to keep annular fill out of the active channel.
CRITICAL INTERFACEThe channel remains defined while the new wall system is built around it.Bed the short first section in WDP, center it in the host and level it with the supplied fiberglass shims.
WHY IT MATTERSThe first section establishes the alignment for the full insert stack.Lower the remaining sections and fully bond every joint with WDP.
CRITICAL INTERFACEContinuous joint coverage prevents gaps from becoming infiltration points.Repair and coat the bench and invert, carrying the WDP system up the base insert wall to close the transition.
WHY IT MATTERSThe wall, channel and bench function as one continuous interior system.Fill the annular space with the specified material, install the new flat lid, backfill and return the structure to service.
FINAL CHECKConfirm the top connection, grade and all project-specific acceptance requirements.04 / WHY AN INSERT
An insert changes what must remain intact. The primary wastewater-exposed wall is polymer concrete through its thickness; the field-applied materials are concentrated at joints and transitions.
Wall thickness, geometry and joint profiles are manufactured before the crew enters the site.
No specialized spray truck and no repeated field coats. Sections are lowered, aligned, bonded and grouted.
A coordinated installation can reduce bypass duration and repeated mobilization compared with multi-stage rehabilitation systems.
The finished P3 insert system is backed by P3’s standard limited corrosion warranty, subject to its terms and project documents.
05 / START THE EVALUATION
Share record drawings, field dimensions, photos, pipe locations, depth, access conditions, flow and groundwater information. P3 can help determine whether an insert is credible and what still needs to be verified.