If you can keep the roof integral, these old barns can last forever-- barring other calamities.
This one is over 125 years old and will be gone, I estimate, within one year. The left shot shows how the side which remains covered by the roofing is still in good shape. But it is the east side which will pull the structure down as it deteriorates . This exists on the missouri river valley farmland (some of the richest in the country) available after the river was channelized and levies built to contain the once-meandering river. When these are gone, they are replaced by "engineered" buildings of not quite the same appeal.
