Ground Screws for Light Structures – Load Performance?

[peter651]

In our work supplying metal hardware for fencing and solar projects, we've seen more use of ground screws in place of poured concrete foundations—especially where soil conditions vary.

In your experience:

• How do you evaluate load capacity (both vertical and lateral) for ground screws in non-homogeneous soils?
• Are there reference standards or testing methods you trust?
• Any red flags when it comes to using them for light-duty structures on sloped or sandy sites?

We’ve supplied galvanized ground screws (600–1200mm length) for use on farms and homesteads, and they’ve held up well under basic loads — but we’d like to understand the engineering perspective more clearly for larger projects.

Appreciate any insight or field experience from your side.