Yes, you should always install a geotextile membrane beneath a gravel grid. Without it, infill material migrates down into native soil under load and the grid shifts or sinks.

The membrane does two jobs: it separates the gravel infill from the subgrade so the geocell cells stay full and stable, and it allows water to drain through rather than pool. Skipping it is the most common reason gravel grids fail after heavy rain or vehicle loads — the grid itself is fine, but there's nothing preventing the infill from disappearing downward. The GEOWEB geocell kit ships with geotextile underlayment included, so it's one less component to source separately.

  • GEOWEB geocell kit includes geotextile underlayment — no separate purchase required.
  • GEOWEB geocell kit covers 153 square feet (9' × 17') at full expansion.
  • GEOWEB geocell is available in 3-inch and 4-inch depth options; 4-inch handles heavier vehicle loads.
  • GEOWEB load rating: up to 30,000 lbs, supporting passenger cars, pickup trucks, and loaded trailers.