I have a spare garden shed and was thinking of storing about 20 bales of hay in it, using up just over half of the shed. Would this be dangerous do you think, in case it heated up without much ventilation?
Stack i on pallets to keep it off the ground & you should be ok. All my hay is kept in a store shed as you don't lose any to weathering like you do in open barns. It's too expensive now to have any ruined or waste any.