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Those are what I mean. It will be a general purpose shed and hopefully workshop. Not with any heavy machines, but I would like the option for maybe a table saw or jointer in future. Most guides say no more than 1.5m between screws so I went for 3ft centres for ease of calculation (for an 18x15 building).
Sorry, I misread your comment. I thought you were saying for TW's cardboard tubes you'd need to dig 30 holes.
This is what I think of as ground screws