Manhole Rehabilitation And Adjustment Ring Sealing Specialty



The most cost effective trench-less solution to prevent inflow and infiltration in the most difficult joint sections and upper adjustment ring areas of manholes. No confined space entry necessary!

Longevity and SANI-TRED Manhole Rehabilitation

Since the early invention of the automobile there has been an effort to find a good way to dispose of old tires. Old worn-out  tires have been directly buried in the earth for over 100 years, unearthed, only to discover that they were in as good condition as when originally buried! Polyurethane molecules or artificial rubber are among the most complex molecules known to man. They are flexible and remarkably durable.

Scientists have determined that the best possible environment to keep and maintain rubber products (both natural and artificial) is to keep them in a damp environment in the absence of UV exposure.  Under these conditions it has been determined that natural or artificial rubber will last virtually forever without breakdown or deterioration. These are virtually the same conditions found inside a manhole.

The oldest SANI-TRED installation, an outdoor commercial floor surface, is nearly 18 years old in a heavy foot traffic, UV exposure, environment with no signs of breakdown or substantial wear.  This is only one of the many reasons we can so confidently make the statement "permanently waterproof manholes" and you can have confidence in that statement for your manhole rehabilitation projects.

How & Why SANI-TRED Works Inside

SANI-TRED materials keep lasting elasticity and never solidify or get weak.  SANI-TRED Permaflex, (liquid rubber primer and top coating), enters into the pores of the covered substrate and produces small "rubber sealing plugs". These "capillary filled sealing tentacles" in every single pore keeps down and holds ground water pressure before it has an opportunity to reach he SANI-TRED surface to "push it off" it in mass as with all other sorts of coatings. These infiltrated appendages work like small, high pressure driven, o-rings! The tentacles  seals, anchors and locks the coating membrane surface to the substrate such as concrete, block, or mortar joints, the areas of greatest porosity in a foundation wall.

The photos below show a concrete patio block that was laid horizontally and coated on one side with SANI-TRED PermaFlex. The PermaFlex was reduced with Xylene (solvent) to allow quicker and deeper penetration. Once this coat was completely saturated, more was applied, and repeated. The PermaFlex was tinted red to allow better visual detection of the SANI-TREDs’ microscopic penetration process of Flexible Penetration Technology®. The block was then broken in half to show its internal cross section. Notice the penetration of the red PermaFlex throughout the entire block.

Internal Manhole Sealing


  • Prime with Permaflex
  • Apply LRB-TAV Mixture Reinforcement to Profile All Cracks & Joints
  • Apply Top Coat of Permaflex

This three-step process assures that every crack, hole, joint and crevice is permanently sealed. Experience has proven that a simple single application of something is usually not worth the effort it takes to apply it. By using the SANI-TRED three-step process you are triple protected and assured that all joint imperfections are filled and sealed the first time for the last time!

SANI-TRED products have passed over 10 years of field testing and research in underground water vessels such as manholes, basements, deep cisterns, waste water treatment tanks, elevator pits and swimming pools. This field testing and research is coupled with a rigorous independent testing regimen designed by "The American Society of Testing and Materials, or (ASTM). These independent tests have proven that a SANI-TRED product manhole installations exceeds the minimum requirements for negative pressure retention in US manholes by almost ten times!

  • Negative Hydrostatic Vacuum ASTM C-1244 RESULTS 5 min. @ 12 in.
  • Negative Hydrostatic Air Pressure Rev. ASTM C-1244 RESULTS 5 min. @ 10 lbs.

Constant hydrostatic pressure from the side walls, along with heavy vehicle traffic pounding will never detach SANI-TRED products. They will not peel, blister, chip, delaminate, or detach from concrete, cast iron, concrete block, mortar, in the constant presence of negative hydro-static water pressure on  the coating's  "raw edge"sanitred-order-now1 copy