I have several stacks on my property. I just got a moisture meter and checked them, The stack against the retaining wall facing north is still 35%! Split last year about 4" in diameter. Wow I am surprised I guess there wasn't enough wind and sun in that area. It is also shaded by the house. In summer it receives about 4 hours sunlight! mixed bag maple oak and some other stuff. Just goes to show you that stacks need sun and wind!