Tank Liners


  • Potable grade Butynol Rubber tank liners come with a 20 year guaranty. Tests show that rubber will last over 40 years, even in an exposed environment.
  • Using rubber on a new building will help you achieve Green Star rating – rubber is an environmentally friendly material
  • Rubber has a wide range of operating temperatures. For this reason it is the only material approved by FM Global for lining fire tanks (tanks which have a post disaster role and must remain functional during periods of extreme heat). Read about Southland’s contribution to the Queensland Government Cyclone shelter initiative.
  • Rubber remains flexible and elastic over its lifetime. Most other materials will permanently deform when stretched
  • Rubber is tougher and more puncture resistant than most other membranes.
  • Liners can be made in one piece and fed into a confined space.
  • Rubber liners can be fully installed in a confined space without use of chemicals or hot works.  Light tooling only.
  • Rubber is nominally thicker than most flexible alternatives


…. by dropping in a butyl rubber liner

Refurbishment of existing tank
NEW rubber liner in old concrete tank (original ‘tar’ waterproofing failed)

Why paint-on waterproofing in tanks fail

  • Paint-on waterproofing methods are subject to failure due to movement in the building. Concrete cracks and so will the coating.
  • Groundwater behind a paint-on waterproofing system will lift the coating and ‘bubble’ it off, compromising the waterproofing
  • Paint-ons are subject to the skill of the applicator

The solution is dropping in a rubber liner.  Rubber tank membranes can be made to measure, supplied in one piece and safely rolled out and retrofitted in the confined space of an existing tank.

Butyl is an ideal material for lining water storage tanks. Durable and tough, the material can be delivered to site without damage. Larger liners can be manufactured in sections and site vulcanized to ease installation. Butyl is the only material approved by FM Global for use in appropriately insured fire tanks.

Click the button below to view a few sample installations

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Bolted steel tank industry is Southland’s traditional market for water storage membranes. The portable nature of the liners perfectly compliment prefabricated bolted steel tanks.  The tank shell can be constructed quickly to structurally withstand the hydrostatic loads, leaving the job of containing the liquid contents to the one-piece membrane.  The use of a membrane has the added benefit of isolating the corrosive liquid contents from the tank shell (which basically constitutes the structure)

Butyl tank liner inclusive of roof liner
Butyl tank liner inclusive of roof liner

Tank liner roofs can be made by Southland and either pre-joined or joined on site to the main tank liner. Roof liners are often required for demineralised water tanks where contamination of the tank contents from condensation run off from roof and tank structural elements is undesirable

Tank wall (before site-welding to base)
Tank wall (before site-welding to base)





Southland’s preferred option is to supply tank liners in one piece. Liners can be accurately patterned and joined in our factory.  However, in some cases, a particular site may require liners to be supplied in segments. In these cases, Southland have portable vulcanising equipment which we can use to provied optimised vulcanised joints on site. Butyl is ideal for site fabrication. A full vulcanised joint can be achieved on site. It is identical in strength (and chemical composition) to the base material.


Production takes place in our factory. The liner can be made in one piece or several – depending on your site installer’s needs.


Ø24m x 7m Tank liner in final stages of production.
Ø24m x 7m Tank liner in final stages of production.

tank6Eyelets can be installed along the top edge of the tank liner wall – a Southland Liners innovation which is now industry standard for tank liners, regardless of the material used. The liner is secured to the top edge of the tank via bolts. The eyelets help to distribute the the point loads at the hanging points to reduce risk of tear out. For extremely tall liners, a secondary flap half way up the tank wall may be required to reduce hanging loads at the top edge. Once commissioned (full of water), friction holds the liner against the tank wall. Thus, ultimately, the eyelet load is substantially reduced or eliminated


Ø10m x 10m high tank liner ready for packaging
Ø10m x 10m high tank liner rolled

Tank liners are folded and rolled to ensure ease of manipulation on site. Butyl is resilient to fold cracks and tough to resist abrasive damage from sharp folds. It will not become brittle over time in storage.

Unfolding instructions can be provided on dispatch. Alternatively, if a specific layout is required, Southland can package the liner to suit. All folding is done by hand and the liner is wrapped in geofabric prior to dispatch to avoid damage during transportation to site. Larger liners can be supplied with special lifting provisions if lifting equipment is available on site. Liner size/weight charts are available on request

More information