GBR, I read the article at your posted link.
Are you saying that foam strips on the bottom of the joists will keep condensation from forming on the bottom of the OSB, even though the crawl space is completely open.
I don't see how that is going to change the temperature of the bottom of the OSB.
It seems to me that:
In winter, I need to keep warm moist inside air from migrating through the subfloor and joist insulation and condensing on the inside of the OSB that's covering the bottom of the joists.
In summer, I need to keep warm moist outside air from migrating through the OSB and joist insulation and condensing on the bottom of the subfloor which will be colder due to air conditioning.
Just not sure the best way to accomplish this.
Would painting the subfloor with a vapor retarding paint help the winter problem ?
Not sure of any thing to do for the summer problem. Even if I cover the joists with foam boards (expensive for me), I would still have to cover them with OSB to keep out rodents.
I suppose I could add foam boards on the bottom of the OSB to keep it warmer to prevent wintertime condensation from forming on its inner surface, but I went over this with my wall.
And was informed that no exterior foam boards were necessary to keep the OSB warm in my climate zone (western Arkansas).
Wouldn't that also hold true for the floor since the crawlspace is completely open ?
Could you go into more detail on how adding foam strips between the bottom of the joists and the OSB will help ?