The power of time

It’s hard to believe that over time a nail can back out of a position it was once hammered into without any form of assistance from man. That’s what we found today while doing a hidden gutter repair in North Vancouver. This nail reversed itself over an inch and punctured the EPDM membrane used to waterproof the built in gutter. So how does it happen? I figure it involves thermal cycling and structure settlement. IF there are any Engineers out there that can educate me more…. please do. Until then I know I fixed the leak by sealing up this issue.