I would just put 3/4” advantech on the floor and drive my garden tractor, z turn mower, log splitter, etc in the thing and call it a day. Given initial 500 day no sand warranty for direct exterior exposure, I’m figuring water dripping off my stuff won’t hurt it. Ron
I had never used Advantech until the addition on my son's house. It took way too long to get it dried in but the Advantech held up great, other than discoloring you couldn't tell it ever got rained on. I was really impressed!
Another option would be to staple a layer of poly over the joist tops just prior to laying the sheathing. It should do a good job keeping ground moisture vapor from passing into the sheathing. Cheap insurance and easier than painting.
And we are using treated joist?
And treated lumber rated fasteners.
Just to throw out another option,
I've built 2 sheds,
First I did on concrete blocks with PT 2x with CDX plywood. Was a pain to level the blocks, it raised up the floor so it sat taller, and needed a bigger ramp and when I added up the cost and the PITA effort to level the blocks in my yard, when I built my shed in my new house I did it differently.
I paid to have a concrete pad put down with anchor bolts. it cost more, but i didn't have the need to do any of it myself, deal with the leveling etc, and I'm happier with the finished product. I also had him pour a little ramp up to it.
Now the nice gentlemen who did this poured it out of square...which pissed me off on such a small pad of 10x12.. but I still am happier with the shed.
I also had all the lumber delivered along with vinyl siding, and roofing material etc, to save myself time and effort for all that crap.
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