This training builds on the basic air sealing skills taught during an initial weatherization training class. After a quick review of the knowledge a basic air sealer should have the course moves into the techniques for locating, quantifying and air sealing key details in an existing home. Attendees should leave the class with a good understanding of what key details are, how they are located, what pressure diagnostics can be used to qunatify the amount of leakage and what technique to use to address the leakage site.