Structural liners are engineered to reinforce, seal and protect existing brick, block or precast concrete manholes. The Engineering Design Guide specifies the material strength and thickness required to double the life of weakened manholes as determined by its depth, ground water pressure, traffic loads, shape and condition.

PERMACAST® Structural Liners are made of specially formulated fiber reinforced cements engineered for underground sewer structures. Design specifications aid in the selection of the best material for each particular problem. Our systems are installed by our factory trained and certified network of applicators. Our patented process allows for bi-directional centrifugal compaction applied uniformly from top to bottom for consistent thickness and easy inspector verification.


  • Uniform application

  • Densely compacted

  • Safe operation

  • Precise thickness

  • Reference Documents:

  • Contact us for Design Specification

Martech Underground

Martech is a technical sales agency committed to delivering value to our many partners:

  • Manufacturers

  • End-users

  • Specifying engineers

  • Distributors

  • Installing contractors

Martech drives strategic sales by involving all the people above in finding the current problems, developing solutions and creating demand for the products we represent.


  • AP/M Permaform
    PO Box 555
    Johnston, IA  50131


  • 515.276.9610
    800.662.6465 Toll Free 515.276.1274 Fax

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