Liquid Polymer Engineering

Injection Waterproofing

High pressure polymer injection waterproofing

Gautrain Tunnel

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Liquid Waterproofing was the chosen company contracted to seal the water leakage in the Gautrain tunnel system.
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The Liquid Waterproofing system was chosen out of various bidders to complete the work.
The successful sealing of the Gautrain tunnel in the vicinity of Park Station allowed the station to open for business.
The tunnels from Park Station to Rosebank Station, Rosebank Station to Sandton, and Sandton to Marlboro have also been successfully sealed by Liquid Waterproofing.
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How It’s Done

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Depending on the structure and products used, a series of 5mm, 10mm and 16mm holes will be drilled into the structure to the target depth.
After successful testing of the holes, the applicable product will be injected with specially designed injectors to form a seamless membrane within the structure, blocking all porous areas and pathways. Drilled holes will be re-filled or grouted.
Our Company is proud to be using our own developed and patented chemicals, providing a service where we will guarantee to control and manage your water infiltration problems.
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Like any superior system, Poly2Flex grout treatment is no doubt very cost effective. The cost compares favourably with the cost of alternative sealing methods.
The differences are that Poly2Flex requires less time and that much fines passages can be penetrated and sealed.
The positive sealing effect of Poly2Flex makes it possible for experienced personnel to predict the likely success that can be achieved after careful inspection and evaluation of each watermark problem.

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The Chemicals, be it natural or synthetic, are not used on their own but are mixed, and is applied in conjunction with certain additional chemicals.

All the chemical ingredients needed to produce P100 - Poly2Flex compound must first be dissolved, emulsified or dispersed in distilled water. Liquid ingredients, which are water soluble, that are added, are dissolved in demineralised water.

We have successfully built up a good track record by using our chemical in structures such as mines, grain silos for agricultural co-operatives, industrial and commercial buildings and items including pump houses, pipelines, car park basements, reservoirs, dams and valve chambers.

We have realised from experience over the years that Civil Engineering environments, pertaining to water leakages, are one of the toughest engineering environments in the world. We employ the best expertise and specialists in this field as well as utilising the best international technology to successfully solve water leakage problems.



Retaining Walls


Patio and Flat Roof


Rising Damp


  • Tiled/Paved Slabs

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    Tiled Patios
    Parking Decks
    Paved Decks
    Unless you would like to replace your tiles, a fast and effective injection waterproofing solution will take care of your water ingress problems without removing any tiles.
  • Silos

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    Gas sealing
    Not only will we stop water ingress at small persistent areas, but we can also provide turnkey solutions for your water ingress in tunnels, round hoppers, through silo floors and walls. In addition to stopping water either above or below ground level, we can also pressure clean the interior of tubes to enable us to provide accurate pricing on repairs and internal gas sealing and waterproofing.
  • Underground Structures

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    Wine Cellars
    Lift Shafts
    Valve Chambers
    No need to excavate around your structure to re-apply or repair traditional membranes. Simply seal floors, retaining walls and joints with high-pressure chemical structural injection from the interior of the structure. Guaranteed.
  • Concrete Slabs

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    As long as your torch-on membrane is still in reasonable condition, injection waterproofing will stop future water leakage problems, without replacing the existing membrane. Fast, effective and guaranteed.

    Alternatively we shall replace the old membrane with a new Polyurea membrane.
  • Frames

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    Window and Door
    Aluminium Frames
    Wooden Frames
    Only perfectly installed frames will withstand moisture or rain ingress. A fast, effective and guaranteed method of sealing these frames can be done with chemical injection waterproofing, without removing any frames.
  • Cavity Wall Waterproofing

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    Cavity wall waterproofing is a two part process. Cavity will first be primed with Poly2Flex and then filled with closed cell SPF to fill the cavity and provide insulation.
  • Joint Re-Sealing

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    Expansion Joints
    Construction Joints
    Chemical injection sealing of expansion joints will prevent future water ingress into the core of the structure. Sub-soil joints easily treated from the interior of the building.
  • Cracked Concrete

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    Structural repair and permanent water sealing of cracks and joints in concrete, made fast and permanent with chemical grouting, combined with high-pressure chemical injection waterproofing.
  • Utility and Commercial

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    Contact us to evaluate and help rectify or manage unwanted water migration through just about any concrete structure.
  • Rising Damp

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    Remedial injection sealing DPC layer in walls will prevent future water ingress into the core of the structure. That is without any structural changes.
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