FINALCAST MORTAR: Centrifugally Cast Concrete Pipe Mortar

FINALCAST MORTAR is a high-strength, cementitious liner designed for renewal of underground con-crete storm and sanitary sewer pipe creating a new pipe within the old. Curing in place to form a hardened shell, FINALCAST MORTAR is formulated with a focus on waterproofing, sealing, abrasion resistance, structural reinforcement and corrosion protection.

For use in waterproofing, sealing, structural reinforcement, and corrosion protection of underground sewer pipe and manhole structures that cure in place to form an interior hardened shell.


  • Dense and highly impermeable cementitious liner
  • High modulus of elasticity
  • Fiber reinforced for added flexural strength
  • Concrete gray color


FINALCAST MORTAR is formulated to create a dense, highly impermeable structural liner designed for thin-section toughness, a high modulus of elasticity, and superior bond strength. Additionally, fibers are added as an aid to casting, increasing cohesion and enhancing flexural strength.

Pressure wash the interior surface with a high-pressure water blast sufficient to remove all laitance and loose material, completely flushing all debris from the pipe. Rusted portions of corrugated steel pipe should be removed or sand blasted to white metal and coated with a rust inhibitor.

Combine 50 lbs of FINALCAST MORTAR pack-aged dry mix with 7-8 pints of clean (50°-70°F) water while mixing with a high-speed shear mixer until proper consistency is obtained. Water content may be adjusted to achieve consistencies ranging from plastic to modeling clay.

Continue to agitate the mortar to prevent thickening beyond the desired fluidity. Despite its workability, the mortar has excellent wet adhesion and does no sag or run after placement. Working time is approximately 25 minutes depending upon conditions.

When mixed according to above instructions, FINALCAST MORTAR may be sprayed, cast, or pumped into any area 1/4 inch or larger by most standard commercial mortar mixers, compressors, or pumps.

Position the rotating casting applicator within the center of the sewer pipe and commence pumping the mixed mortar. As the mortar begins to be centrifugally cast evenly around the interior, retrieve the applicator head at a speed appropriate to the desired thickness. If flows are interrupted, simply stop the retrieval of the applicator head until flows are restored. Retrieval speed can be varied to create different thicknesses to provide sufficient and varying strengths.

Because of the even application throughout the circumference, thickness may be verified at any point. If additional thickness is desired at any level, simply place the rotating applicator in the desired location and recommence pumping and retrieval until desired thickness is achieved. Built-in bonding agents allow additional layers to be applied at any time. The pressure application from the centrifugal casting of the mortar produces a finely textured surface that requires no additional troweling or finishing.

Thickness can be verified with a wet gauge at any random point of the new interior surface. Any areas found to be thinner than minimum tolerances shall immediately receive additional material. Visual inspection should verify a leak-free, uniform appearance.

Use an ASTM C-309 compliant curing compound or Cure & Seal as required.



  • 50 lb (22.7 kg) bags
  • 50 lb (22.7 kg) plastic pails

50 lb (22.7 kg) yields approximately 0.43 cubic feet



The data shown is typical for controlled laboratory conditions. Reasonable variation from these results can be expected due to variation in type and quantity of cement, and sand gradation of the mortar mix. When testing the field mixed material, other factors such as variations in mixing, water content, temperature and curing conditions should be considered.