Don't think it happens very often, but it will happen if job wasn't done correctly. One day we got a call from our customer stating that his 6 years old deck has collapsed. When we got to the site we couldn't believe in this . After quick inspection we came to the conclusion, that not being properly flashed and fastened to the house by previous installers caused this major damage. We've rebuilt it completely upto current international and state building code and at this time right. For @niceguys_inc team projects like this one are peace of cake.