“We didn’t do cut side down on the bottom layer either, though I have read some people recommend that. We tried once, (ground level storage) and didn’t notice any difference, and it wasn’t worth the trouble”
Putting up hay on its side isn’t really necessary when buying from a re-seller. The majority of their supply has been stored and has gone through a compete dry down.
Hay that is pretty much straight out of the field should be stacked on its side to help wick (sweat) moisture and speed the curing time.
IME as a producer in my neck of the humid woods. Once hay has dried down to around 8-10-12+% moisture content. It doesn’t change much there after. Even in a hot humid loft. The bales do not act like a sponge.
IMO and experience storing hay in a loft is superior to any other way. It is on wood with a big flowing air space below. Which keeps excessive floor moisture in check.
Barn fires are rare as it is. Few if any can be directly attributed to stored hay in a loft. Yes, it can be considered an “accelerant” but by the time a fire has gotten that far along to burn through the ceiling/loft flooring the building is a total loss anyway.
Once fires have started how fast they spread depends on a number of things. And preventive measures that have been taken. Loft “trap doors” hay/straw drops should have reasonably tight closing hatches that are kept closed when the barn is unoccupied.
Left open and god forbid there is a fire they will act as a chimney. Speeding up the fire below and allowing sparks, fire to quickly ignite things in the loft.
In this day an age all barn lighting should be with cool low voltage bulbs only. Saves quite a bit on electrical cost. More importantly they never get hot enough to ignite, dust, cobwebs etc that can and does collect on them.
If broken unlike incandescent bulbs they won’t spark and potentially ignite anything.
I grew up with “loft barns”. Every barn I was ever in in those days, new or an old barn, hay and straw was stored in the loft. I wouldn’t own or build a barn without a loft.
To each their own on this.