I am currently trying to figure out how to store my hay for the winter. My barn will be able to hold some of the hay I need, but not all of it. I am looking into the tarp and pallet idea and I have a few questions. I see a lot of different methods. All of these end with putting a tarp over the whole thing, but my question plays into what to do under the hay. I've heard some people do hay on pallets, hay on tarp on pallets, hay on pallets on tarp, hay on pallet on pallet. Which method do/would you use? Another question I have is when you cover the whole stack how does that allow for air flow? I mean hay needs airflow in order not to combust, right?