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Lining Products

The benefits of advanced geomembrane technology

All of our geomembranes contain a finely calibrated combination of antioxidant additives, stabilizers, and UV-resisting carbon black to meet strict, international quality criteria (American Society for Testing and Materials and the Geosynthetic Research Institute).

In fact, HDPE liners are designed to last for over 100 years and are globally accepted as the best material to use for agricultural, civil, and construction applications, especially because they provide:

  • high tensile strength
  • tear resistance
  • an ability to be welded

When choosing between HDPE and rubber liners the most important factor to consider is how the materials are seamed together. Rubber liners tend to be glued or taped together, while HDPE liners are welded. Adhesives can deteriorate over time compromising the integrity of the join and security of the bond.

Wedge or fusion welding is recognised as the premier method of joining geomembranes, as each weld can be tested to ensure that a complete and uncompromised seal has been achieved. The process uses heat and pressure to create a double-track weld along the length of overlapping sheets of HDPE. The cavity between the sheets is then sealed at each end and pumped with air until it reaches 2.5 bar. If the air pressure holds without dropping more than the allowable 10% over 5 minutes, the seam is deemed to have passed. If not, failures in the weld are repaired by locating the point out of which the air is seeping.

It is this technique combined with daily onsite equipment calibration that enables I.S. Dam Lining to provide you with secure containment solution.

There are a variety of geomembrane liners, each suited to a different application. We can advise you on the best liner for your project, specific to size, shape, depth, purpose and terrain. Other factors in product selection include geomembrane density, tensile strength, UV durability and chemical resistance. You're guaranteed a long-lasting quality result.

High Density Polyethylene (HDPE) geomembrane is a plastic liner with a wide range of applications: farm dairy effluent ponds, landfills, waste water tanks, and water storage reservoirs. HDPE geomembrane liner combines high tensile strength, chemical resistance and comes with a 20 year product warranty. Read more about HDPE.

hdpe geomembrane plastic liner

Geotextile is a cushioning carpet laid on rough subgrade to provide a smooth flat, firm, unyielding foundation for the membrane with no sudden, sharp or abrupt changes or discontinuity in grade. Geotextile is also used as a protective layer over geomembrane in landfills, protecting the liner from rupture by fill material. Read more about Geotextiles.

geotextile used as protective layer over geomembrane


Reinforced Polypropylene (RPP) membranes are used for gas containment. RPP is reinforced with a polyester scrim to greatly enhance its strength and durability. Its low permeability and excellent multi-axial strength make it an ideal gas barrier.

reinforced polypropylene

Geosynthetic Clay-base Liners (GCLs) are often used in combination with plastic geomembranes to form a reliable seal on sites such as landfills, effluent containment, and tailing dams. Made from a polymer scrim and enriched with Sodium Bentonite clay powder, this geotextile liner is an outstanding hydraulic barrier and is used worldwide.

geosynthetic clay liner


PolyLocks are durable HDPE profiles that are laid in concrete pond edging to provide a smooth welding surface that is ideal for attaching to HDPE geomembrane. Read more about PolyLocks.


Gas Venting is used to expel methane and carbon dioxide from ponds where organic matter is decomposing. This is of particular importance to farmers, and their dairy effluent ponds. Dairy NZ encourages the use of venting to prevent bubbles developing under the synthetic membrane, and potentially compromising the integrity of FDE ponds.

The gas venting is deployed in a grid system, with each length of venting strip terminating at a gas vent welded into the liner.

gas venting

Stud-Liner is an HDPE geomembrane with anchoring studs that are set into vertical concrete walls to protect the concrete from mechanical damage and corrosion. Geomembrane liner panels are then extrusion welded to the stud-liner to create an impermeable system. Stud-Liner is used in industrial, municipal and civil applications such as wastewater treatment, tanks, sewer pipes and tunnels.

stud liner

stud liner used on waste water tank

All ponds should have at least one permanently placed ladder or alternative escape means in case a person falls into the pond. IS Dam Lining provide a tailor-made solution to this farm hazard by installing safety ladders made of the same material as the liner. The ladders are low cost, robust and durable.

safety ladders