Originally Posted by 1Boyscout
How old is an AS when they begin to leak?
There is no simple answer to that. Some leak basically right away, other never leak, and others after a few years. The thing to do is to watch for sign of leaks inside, test the wood floor with a moisture meter from time to time (especially under windows and near doors) and keep up with maintaining the exterior caulk. An annual inspection of the exterior skin and roof penetrations after a unit is a couple of years old would be a good place to start.