I have no idea. I have aggregated some of the ground screw calculators to get to that number. Shed will likely be 18' x 12' and a lot of timber. Maybe.
Edit: ground screws on 3ft centres would mean 35 screws. Not sure how you calculate for piers, especially if suspended off threaded bar on top as suggested.
Are you running joists at 12ft length rather than 18ft? You'd end up using a lot more joists that way.
*A larger number of joists, not necessarily more wood, which could drive up the number of screws?
Good point. My napkin sketch has them at 12ft lengths, only because that feels right to me. 18ft lengths would (again, only in my mind) need more noggins, so could end up requiring more timber.
I have no idea. I have aggregated some of the ground screw calculators to get to that number. Shed will likely be 18' x 12' and a lot of timber. Maybe.
Edit: ground screws on 3ft centres would mean 35 screws. Not sure how you calculate for piers, especially if suspended off threaded bar on top as suggested.