Curtain wall systems are designed to protect the interior of a commercial building from the often harsh exterior environment. A curtain wall failure can be easy to resolve or lead to a lengthy and expensive remediation process. In many cases, curtain wall failures are caused by fairly simple errors that occur during the fabrication and installation process. These are errors that could easily be prevented by a wider awareness of how curtain walls perform and how to install them so they can perform as intended. All stakeholders in a commercial curtain wall project should have a high level understanding of the few errors that cause the majority of in-field failures. This presentation will highlight these errors so that all stakeholders will have a better understanding of what they should be looking for to ensure a safe and successful curtain wall application.