Here we have a pyrite wall failure. What do you think it teaches about proper tile installation?
On this blog, you read about best practices for quality tile installations and how Certified Tile Installers (CTIs) go about installing tile. You've also heard them refer to having their work taken apart and inspected as part of the CTI hands-on test.
That same approach is how Mark Heinlein CTI #1112 and Robb Roderick CTI #727 troubleshoot tile installation issues in their role as National Tile Contractors Association (NTCA) Technical Trainers. In this article, they respond to a failed installation of pyrite tile on a wall.