Yesterday while delivering lumber to a horse barn, I asked the owner how big his barn was and how many bales of hay could he store. His barn was 30'x 30' and he had currently 300 bales and was intending to add 150 more. We discussed this pound per square foot issue and he figured quickly in his head that he was placing between 60 to 80 psf on his hayloft. He figured his bays weighted about 40 lbs each, as they were string tied. He stated, as mentioned, hay bales can weigh a lot more, especially went they are wire tied.
Just some info for you, Ken.
To Dick Schmidt: let us know what your class comes up with, next semester.
Good luck, Jim