Aptos, CA, United States.
As you've probably noticed from my prior post, I'm in the process of building a foundation for a garden shed. My specific county/region does not have strict restrictions/requirements on shed foundations or concrete use. Good news: I'm on my own. Bad news: I'm on my own. At this point, I'm pretty sure I want to go with a concrete pier foundation.
The floor measurements are as follows:
I was originally planning to set three rows of 8 inch piers (three piers per row) with a pressure-treated 4×4 lining each row… but now I'm wondering if that's not enough or too many…
My questions are:
How many concrete piers would you suggest I use in order to support a floor of this size and an empty distributed building weight of 1600 lbs (without people standing on it).
Do piers always need to be at the very end? Or can there be a small overhang of wood? Ideally I'd like to have the piers away from the edges of the perimeter so they're not as visible.