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Plastic Liners

There are four basic types of Plastic liners: T-LOCK*, rigid liners, drop in bag liners and formed in place flexible liners.

Leewens Corporation has installed T-LOCK* for municipalities all over the United States, including Boston, San Francisco, Portland, Seattle, and many other cities. T-LOCK* is placed against the forms, then concrete is poured. The bond to the concrete is a mechanical bond provided by the T's. After the forms are stripped, the seams are welded and all penetrations are patched and tested.

If you need more information on T-LOCK, Contact Leewens Corporation.

Rigid liners are custom made from solid sheets of composite materials. Seams are either extrusion or fusion welded to provide a leak free, chemical resistant liner. Leewens Corporation works with many different types of composites including PVC, CPVC, PVDF, Polypropylene, and HDPE. Seams are tested after welding.

Formed in place flexible liners can be installed as free floating liners attached only at the perimeter. The free floating systems allow for movement of substrate and differences in the coefficient of movement without adverse effects on the liner. Perimeter attachments are determined by the type of installation. Common applications for free floating liners are ponds, tanks, leak detection barriers, and secondary containment.

Formed in place flexible liners can also be adhered with mastic or gaskets to form a completely sealed structure. This type of liner is often used to rehabilitate concrete structures that have eroded, structures of complicated design, or in steel chemical process tanks.

Bag liners come preformed and are inserted into your tank. Advantages of bag liners will be less down time, ease of installation and the ability to have them in stock for emergency repairs.


Fluid applied liners have a wide range of temperature and chemical tolerance.

Epoxy, polyester, urethane, and vinylester are the most popular types of tank liners. These base components are filled with a chemically inert material or reinforced with fiberglass. Resinous linings are a good choice where conditions are extremely harsh such as high alkaline or acidic areas and elevated temperatures.

Leewens Corporation has installed linings to enclosed and open top tanks. By using appropriate containment and environmental controls for proper temperature and humidity regulation, it is possible to apply tank linings at any time of the year.

Leewens Corporation prides itself on our surface preparation. Come see what we do! Contact Leewens Corporation for more information.



Click or scroll down to see a photo slideshow of Leewens' concrete repair projects.