Dedicated to advancing the use of fabricated geomembranes through education, research, and technology transfer.

Factory fabrication reduces field welding, reduces installation time and costs, allows modular construction and provides consistent seam and liner quality.

Geomembrane Test Method Videos Now Available

FGI has created FIELD AND FACTORY VIDEOS for the following
Test Methods:

ASTM D1239 Chemical Resistance, ASTM D1203 Volatile Loss, D5641 Vacuum Chamber, ASTM D4437 Air Lance Test,
ASTM D5994 Thickness (Textured), D5119 Procedure B Thickness (Smooth), ASTM D7408 Seam Peel Strength, ASTM D882 Tensile Properties & D7408 Seam Shear Strength, ASTM D1204 Dimensional Stability, ASTM D1790 Brittleness Temperature.


Listen to our Geo-Engineering Podcast Series!

Join Tim Stark (Professor of Civil Engineering and Technical Director of the FGI) and Jen Miller (Coordinator of the FGI) as they discuss the latest emerging geosythetics industry trends and news.


Earn PDH Credits Online

Cutting edge topics presented by industry experts & scholars.


View Our Latest Webinar: Strengths and Uncertainties Regarding FPAS Containment by Modern Liner Systems

Recorded November 22, 2022


Education - Research - Technology Transfer

FGI is committed to these objectives. Click below to learn more about our Mission

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Design and Installation Detail Drawings Available

Details available for constructing a containment facility including pipe boots, concrete attachments, penetrations, and vent details.  Both PDF and DWG available.

View details

Garrison Dam National Fish Hatchery

Fish Rearing Ponds
Viaflex Dura-Skrim N45B 45 mil thick Reinforced LLDPE Geomembrane Propex 801 GEOTEX Geotextile, and factory fabricated Ballast Tubes
International Cover Systems (ICS) and Viaflex

The Garrison Dam National Fish Hatchery in North Dakota is a federal facility, which produces over 10 million native fish annually. Along with the role of providing fish for restoration stockings or balancing fish populations, the facility is also an attraction for tens of thousands of tourists annually. This project consists of lining five of their existing 66 fish rearing ponds with geosynthetics. The subgrade is a clay/sand mix which was graded, compacted, and cleared of any rocks, roots and other potential penetration hazards prior to arrival of International Cover Systems on-site to install the geosynthetics. Each of the five ponds were lined with six specifically factory fabricated panels for ease and speed of deployment. In addition, 205 factory fabricated ballast tubes ranging from 32 to 46 ft long were filled on-site with Peastone and placed on the deployed geomembrane panels after they were seamed and quality tested. The geomembrane was secured with battening to all of the associated concrete structures.


Originally, the designer for this project specified a 45mil thick reinforced polypropylene (45RPP) geomembrane due to its UV resistance in long-term exposures, high puncture resistance, tear strength, cold cracking resistance, and potable water qualities, which are compatible with fish rearing. Due to supply chain issues after the project was awarded, 45RPP geomembrane was not available for the duration of the specified project timeframe. As a result, project engineers substituted Viaflex Dura-Skrim N45 45 mil thick reinforced linear-low density polyethylene (LLDPE) geomembrane for the pond liner system. Not only was the LLDPE geomembrane available within the project timeframe scope, it also shares similar properties that originally attracted the designer to the 45RPP geomembrane.


The use of factory fabricated geomembranes and ballast tubes aided the project in a variety of ways. This project was originally scheduled for installation in August 2021,giving the installation crew many hours of weldable temperatures and weather. Due to the aforementioned supply chain issues of the originally specified geomembrane, the project was delayed until late October 2021. Temperatures in Riverdale, North Dakota during late October limited welding operations to only a few hours per day. As a result, it was important to minimize the amount of field geomembrane seaming, which was accomplished by factory fabricating large panels. Deploying the geotextile underlayment and large fabricated panels for the first part of the day allowed ICS to perform quality welding operations when ambient and sheet temperatures reached optimal levels. Limited field welding due to the use of large fabricated panels minimized the duration of welding each day and allowed the project to be completed with the highest quality even in late October.  

Another challenge that was mitigated by using fabricated geomembrane panels and ballast tubes is the strong North Dakota winds during late October. Ballasting was required as soon as the geomembrane panels were deployed to maintain control of the geomembrane in the windy conditions. Fabricated geomembrane panels reduced the time required to secure the geomembrane with ballast, saving valuable time, and keeping all crew members safe from what can be a dangerous situation with an unballasted geomembrane in a windy environment. All ballast tubes were factory fabricated, shipped to the site, and filled with Peastone in place.  


The FGI is proud to highlight our members' projects utilizing fabricated geosynthetics. Check out some
of the creative projects, understand why certain products were selected, and read the project descriptions
as well as the important lessons learned.

VIEW Project Spotlights
We are a non-profit organization providing education, research, and support for the flexible and fabricated geomembrane industry.

Check out some of our research and related topics


Ask the expert...
Tim Stark, FGI Technical Director

Tim Stark, Ph.D., P.E., D.GE., F.ASCE


Review our FAQs and you still have a question, please CONTACT US & Tim will get back to you as soon as possible...

Geomembrane Guide

An interactive list of geomembrane products for various applications. Read more

The FGI Equipment Guide

An interactive list of welding equipment and products for
fabricated geomembranes. Read more

Temporary Landfill Covers - Design & Construction

Strengths and Uncertainties Regarding FPAS Containment by Modern Liner Systems
Presented by R. Kerry Rowe, Ph.D., P.E Geoengineering Centre and Queen's-RMC, Dept. of Civil Engineering, Queen's University.
Recorded on November 22, 2022

Earn PDH Credit for viewing this webinar!


Dr. Stark Visits Layfield Group in Lakeside, California

On November 18, 2022, Tim Stark visited the offices and factory fabrication facility of the Layfield Group in Lakeside, California. Tim met with Brian Fraser, Vice President, Strategic Business Development; Rob Rempel, Vice President, USA; Mike Da Silva, Director of Sales; Laura Quillen, Account Manager; and Nichelle Noel, Operations Manager (see Figure 1) to discuss current and future Layfield activities in North America. In addition, they discussed current and future FGI activities, including the new Spanish webinar series, which Mike and Laura will participate in, collaboration with IAGI, a new operation and maintenance guideline for water reservoirs, upcoming MQA and CQA training, and current University of Illinois research on EIA geomembranes and a carbon footprint calculator. Nichelle(see Figure 2) and Rob showed Tim their factory fabrication area and some floating cover projects undergoing fabrication. Afterwards, Brian, Tim, and Mike toured the recently completed Mt. Woodson Reservoir floating cover system (see Figure 3), which is featured in an FGI Project Spotlight ( that illustrates the advantages of factory fabrication and use of flexible geomembranes.

Dr. Stark hopes to visit the facilities of all FGI members to better understand each member’s business and how the FGI can provide additional benefit to them. The FGI is an exciting advancement in the geomembrane industry and allows the Institute to focus on all geomembranes that can be factory fabricated.

FGI at Geosynthetics 2023 Conference

Monday, Feb. 6, 2023:
3:15-4:30 pm
- Technical Session 1 - Applications of Fabricated Geosynthetics:
• PVC Geomembranes in Agricultural Uses
• Carbon Footprint Calculator
• Liner Payment Bases
• Case Study: Netherlands Motorway Underpass
• Evapotranspiration v. Engineered Turf Covers for Landfill Final Closure
• EPS Geofoam Done Right: Saving Time and Money

Tuesday, Feb. 7, 2023:
1:30-3 pm
- Women in Geosynthetics Round Table

1:30-3 pm - Panel Discussion 1: How to Write a Good Geomembrane Specification

Wednesday, Feb 8, 2023:
8-9:30 am
- Technical Session 2 - Fabricated Geosynthetics for Water Retention Projects:
• Designing & Constructing Geosynthetic Floating Covers for Municipal Water Storage & Treatment
• Operation and Maintenance Guideline for Geosynthetic Lined Water Reservoirs
• Case Study: Lake Forest Reservoir Relining & Floating Cover Fabrication & Installation
• Case Study: Chambers Dam Reservoir Remediation
• PVC-EIA Alloys: Best Choice in Prevention and Protection of Water Resources

9:45–11:15 am - Panel Discussion 2: O&M Manuals for Geosynthetic Lined Water Reservoirs

Register for Conference
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Pond Leakage Calculator

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Specifications & Guides

FGI, ASTM and IAGI material specifications in one place for your reference and convenience


Geomembrane Guide

A comprehensive guide to industry and our member material offerings for fabricated geomembranes.