iron
Minister of Fire
I live in wet western WA and have found that top covering with plastic leads to wet wood. The water runs down the sides of the splits and keeps them wet. Farther down you go, the wetter it is. Rain doesn't just fall down it blows sideways.
Metal roofing is much better because it hangs over and extends beyond the wood. Weigh it down so the metal doesn't blow away. Still, the bottom portion of the stacks will get wet from windblown rain.
A woodshed is the answer. Only needs to be big enough for one year's wood but a shed divided in half with each half large enough for a full winter's wood is ideal. Then you can skip the lame covering issues.
highbeam: do you then leave your stacks uncovered for a year of seasoning before moving them into the shed for the next year?
this is my first year burning wood (started collecting in august). my plastic covering seems to be fine so far. my stacks are next to a cedar fence (property line) so i think the overall wind is lower there. not great for air circulation, but seems to be okay for keeping the worst of the pacific NW ferocity off the wood.
https://www.hearth.com/talk/threads/where-to-stack-next-what-would-you-do.153232/