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Shopshack t1_j9gbukp wrote

A few comments: Check and see if you need a permit for that size. That is over the size limit for a no permit accessory building in most jurisdictions.

No need for any 16 foot boards, just run your joist in the 12 foot direction.

If I was spending the money to build a shed with the cost of materials this these days, I would have the joists sitting on doubled up two by tens, running the 16 foot length. Those would be sitting on pier blocks dug into the ground. If you angle the ends, you would be able to drag the shed in the future, or jack it up and get it onto a trailer to sell it, or move it.

There are lots of plans for free available on the Internet on how to build a shed that will answer many of the questions you have. Also, since I haven’t seen it mentioned, you should have plastic sheeting below the foundation to keep moisture from rising up and rotting out your framing. I live in the Pacific Northwest, and would use pressure-treated wood for my foundation.

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Camarofeind OP t1_j9gc448 wrote

I think there is some miscommunication on my part . I am just building a gravel foundation that will be 12x16instead of a slab. The shed will then be built in the gravel area. The shed I am planning on building will be 10x12. So really I wanted to see if I should even worry about removing the mulch or just place the gravel on top. As for the 2 8 fr post that will be just used more as boarder for the gravel area in my yard .

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