The crew hears from Rob about a very cool training lab for weatherization work. Cooper shows off his newly-completed garage air sealing and insulating project. Jeff describes how industrial gas bottles are safety tested and he talks about some very interesting bottles dating from the earliest days of rocketry. Cole gives his secrets for installing dog doors meant for entry doors. Daniel wants to know who makes the best outdoor caulk. Kevin wants to know the best plan for an efficient house in South Carolina. Brandon asks how to take apart his tub drain so he can replace the tub. Finally Byron wants to know how to safely insulate his walls which have fiberboard sheathing on the outside and a foil vapor barrier (FSK) on the inside.