In this episode, Matt Risinger teaches us how to use Siga tape to air seal your house. In this episode, shot outside an under-construction house in Austin, Texas, Risinger takes on air-sealing strategies. He takes things a step further than he has in the past. First, he takes us through the building science behind why you would want to air seal. He refers to the four control layers on a house water control, air control, vapor control, and thermal control, listed in order of importance. It's important to respect the hierarchy. For instance, water control is more important than thermal control. If your house leaks or if your house has rot or mold, who cares how well insulated it is, says Risinger. Risinger and his team have spent a lot of time over the years ensuring that they are implementing best practices when it comes to water control. But air sealing is up there on the list of important factors. Most of his previous air sealing has been done inside of houses using various methods, which consequently leads to a much better job with vapor control. Watch the full video to learn about air sealing on the exterior of the plywood. His company's goal is to get around 1ACH 50 in terms of air tightness (with a blower door test). Find out what he's using and whether it passes the test.