How is a vapor barrier secured in a crawl space?

Securing the vapor barrier is one of the most important installation steps. If your vapor barrier isn’t properly secured, meaning that gaps are left unsealed, outside air will continue to flow into the crawl space, making the system nearly pointless.  

Creating a virtually airtight seal is the only way to experience the benefits of a vapor barrier. This is done with a combination of mechanical fasteners and specialty tape.