|
Free is always a good thing !!...(ok almost always, this friend doesn't need you help hold trusses on a 5 story building in return does he?....lol).
Around here code says that anything that is that close to the ground must be treated.
If it were me and my shed I'd use treated ply, moisture comes in from everywhere from lawn tractors to wet boots to a 3000 tractor (yes I'm jealous)
BUT
it is free and if you treat it like Hayzee suggested with a good quality sealer (only oil based) you should be OK, Be very careful painting the tongue and groove, there is very little room here for anything extra in the fit.
The only hesitation I would have is the underside, you cannot get to it to repaint it and it's inches from the rock, might be a good idea to lay tar paper (roofing felt) over the entire floor joist system before laying the OSB.
I think using plastic this close to the OSB might sweat and cause you more problems
Being this close also might make the OSB an attractive chew toy for rodents, they tend to like OSB over treated material.
__________________
|