Impermeable membrane in a shoebox design for use with our heavy shallow (360mm deep) 20 cubic metre attenuation tanks. This liner is used to wrap around the geocellular attenuation units and is usually supplied in two fabricated pieces. The first is the base while the second is for the top with a small overlap down the sides. The two pieces effectively make a shoebox.Impermeable membrane will hold water within the structure which can then be released into the mains network or recycled for re-use. The pieces will come folded in a concertina fashion on pallets with clear instructions as to where to place, unroll and pull out.The shoebox impermeable liner comes with a non-woven protector geotextile which should wrap around the whole system before backfilling.Top hat, double-sided tape and jubilee clips are also included for complete installation.For installation advice and guidance please take a look at our attenuation system installation guide. The Landflex AS shoebox attenuation liner i