steel upright sit on dirt?

Why is this? So the upright does not slip down into the soil? So it doesn't rust?
..All of the above and as per install guides, have always had them off the bottom.


Also would 350mm diameter upright holes be OK for a 1m high wall
Depends of the soil, slope and how deep the holes are. As an example, generally the holes should be as deep as they are high (minium) but may be deeper depending on the site.

They can probably sit on the ground, if they were loaded from above then maybe concrete under would be more important. They won’t rust much at depth due to lack of oxygen. The diameter is less important than the depth so 350 should be ok unless the engineer plans say otherwise.

Fantastic, thanks for the replies. Depth will be 1.1m and height is 1m so seems like all is good. Landscaper was only going to go 0.8 deep but told him to use 2.1m uprights as it's a 30 plus degree slope.

Sorry to jump on the end of this thread with a product promotion, but these brackets make it so much easier to set your UC's especially if you need to allow a footing underneath.

https://www.demak.com.au/shop/steel/...fore-concrete/