1project2many
ArboristSite Guru
your covered stacks and especially your shed provide the perfect environment.
No. That's not correct. The sheds are dry inside. They are not damp inside. They are built to move air via convection and they do it well. They face southwest, too, and will warm nicely in the sun. They do a great job drying firewood. The covered stacks are also drier than exposed piles. If I leave wood stacked or piled on the ground without cover it rots. The mushrooms were growing in wood that was dumped in a pile randomly awaiting splitting. The wood had gotten soaked from weeks of rain and dark/gray days and didn't dry out. I actually try to plan processing so I do not have large piles of uncovered wood sitting on the ground as it rots very quickly.
Have faith that I am observant and smart and can find good solutions to problems. My experiences here may not mirror yours but that does not mean I can't figure out what's going on.Not trying to pick your methods apart... but mushrooms and the like growing on your firewood is a pretty good indication that an adjustment of some sort may be required.
I know the argument has gone 'round-'n'-'round on this board. But there really is no benefit to putting a roof over firewood before it's fully seasoned... even one day of sunshine will do more than keeping 10 days rain off it. Heck, most of the rain just runs off the ends and drips on the ground. And free-flowing air will carry away more moisture, even if you have more cloudy days than sunny days.
You might need to spend time here to get a feel for just how wet it is. I think you'd need to see it and experience it to really get it. The old timers around here built their barns six to eight feet in the air to keep the floors from rotting. They'd put the houses up a foot to 18 inches. With the barns they'd pile stones on either side to form ramps or build it into the side of a hill, then use granite posts to support the floor joists. Untreated wood used against the soil just doesn't last long here. Lumber yards don't like to leave wood piled outside for long, either. I've got 8' Pine logs out back that were felled the summer before I bought my house. They were useless for lumber within three years. Moisture is worse here than any other place I've lived. I'm not saying the problems can't be solved. I am saying that it can take extra effort to make a working solution.