With all of the different membranes that may be used on a job, it is good to know the basics about vapor barriers such as what they are, why they are used, and where you will typically use them on the job. The module also references sections of the TCNA Handbook that should be reviewed before installing vapor barriers. To complete this course and receive a certificate, you will need to complete the online module which will take a minimum of 11 minutes and then you will be required to take a 10 question quiz about what you just learned.