The two most common methods for fastening a drop in tank liner in a concrete structure are a compression strip or a Koroseal® Rib-Lok embed strip.
In new concrete, the Rib-Lok strip is placed into the form as it being poured. This embed strip provides an area of PVC to which the drop in liner can be hot air welded to. The Rib-Lok strip is made from Koroseal PVC so it carries the same corrosion resistance as the liner itself. The embed strip provides a liquid tight seal for the attachment of the drop in liner.
The compression strip method can be employed in either new or existing concrete. A mechanical fastener (wedge anchor, Tapcon, Hilti, etc.) runs through the strip, the liner, and into the concrete. When the fastener is tightened it compresses the strip and the liner to the concrete wall. An appropriate caulk should be used between the liner and the concrete to ensure a liquid seal. For simply holding the liner in place, fasteners should be placed on 12-18 in. centers. For a liquid seal the fasteners should be placed on 6 in. centers. Compression strips can be made from any appropriate material. Witt Lining Systems supplies compression strips that are 8 ft. long x 2 in. wide x 1/2 in. thick. They come in a standard style made of UV inhibited poly pro or a pre-dilled (1/4 in. on 6 in. centers) HDPE style.