I have built two firewood sheds for seasoning and storage of fuel wood using pallets and sheeting I found in free wood piles at a nearby industrial park. The used corrugated roofing is from a barn that was being dismantled and moved. I caulked the old nail holes to make the roofing waterproof.
I positioned the woodsheds with their backsides facing the prevailing winds to keep the rain and snow from blowing in, while also providing maximum airflow to dry the wood.
Mark Jacobson
Spokane, Washington