You can tell when Graham starts to miss Ashkahn when he makes a soundboard made up of sound clips from previous episodes just to have Ashkahn do another intro. 

Jake and Graham break down barriers in this episode. Vapor barriers, that is. These tools are a little confusing in the construction world and their efficacy is hotly debated in just regular construction, never mind the demands that a float center has, especially in regards to moisture protection. Fortunately, Graham and Jake know a thing or two about a thing or two and explain what vapor barriers are, how they work, and what the source of contention is.