.....The photo that CJ7 posted illustrates what not to do for a shed foundation: The building is either footed on the PT or the stone, not both. Also the PT perimeter restricts air flow through the stone. Finally whether the PT in the footing or the PT in the skids of the building fails, it's about the same amount of work: you're under a building a few inches off the ground trying to replace rotted stuff.
I am a bit confused by your reply.
My gravel base is made pretty much the same way everyone else who has a shed with this type base makes them.
Mine is a frame of pressure treated wood (6x6's) that surround the gravel to keep it from moving. See D45's picture. He made a pressure treated wood base and then filled that base with gravel.
My shed is then placed on top of the gravel with the same amount of air flow to the gravel under the shed as any other shed that is placed with the pressure treated skids on the bottom of it, directly on top of the gravel. The air flow is created by the shed skids making pathways under the shed to allow air to circulate. Mine has the same thing.
The only difference in my construction is that besides placing the shed skids directly into the gravel, that I also have them resting on the 6x6's. I can't tell you how many times I have seen sheds that are a few years old that were placed on just the gravel, and over the years the sheds have sunk into the gravel, some to the point where the underside of the shed floor is actually now sitting on the gravel! In those cases there is zero air flow.
I wanted to avoid that.
If the foundation I made for my shed is incorrect as you say, can you tell me a bit more as I am curious, since I have the same amount of air flow under the shed as most people do, and I wanted to help keep my shed from sinking into the gravel, so I also placed it onto the 6x6's as well.
Thanks for your input. I do appreciate it, and if I truly did make a mistake, I would like to know so that if it ever fails, I will correct it.
Jim
