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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.
stevo_com-
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? -
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
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I can possibly put you in touch with the guys putting in the shed?
Kurai
hugo7
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I think there are some contributors to this thread today who have the requisite skills ;)
How big is this shed? 30+ sounds like a lot.
Didn't Ali Dymock use something like 9 or 12 brick plinths? I thought the concrete tubes replaced those, so surely you're looking at a similar number.