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Installing a geomembrane low to high gradient?

Q&A: GMA Techline | April 1, 2021 | By:

Q: We are a large liner installation firm that has been asked to install a geomembrane liner from low gradient to high gradient. Is this the new normal?

A: This is not normal, and we suggest you strongly object to this recommendation. There are many stakeholders in regard to panel layout (i.e., installer, general contractor, regulator, design owner, etc.). All have schedules and are involved with tasks, such as subgrade approval, access, geometry and weather. However, the installer is generally the one holding the short end of the stick when water gets under a deployed liner system. In short, rework is not fun. The geomembrane should be installed from high to low. Get support from the International Association of Geosynthetics Installers (IAGI) on this issue, if needed.

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