What's being done in the video appears to be on the extreme low end of the budget spectrum. The use of OSB joists is not what I would consider the national nor

What's being done in the video appears to be on the extreme low end of the budget spectrum. The use of OSB joists is not what I would consider the national norm today. Joists I believe are typically built from dimensional lumber of the Douglas Fir variety. OSB is usually used in the sheathing alone, which can easily be replaced when needed (OSB can't get wet). On higher quality builds, plywood is used for the sheathing. I've never seen a home with OSB joists, but most of the homes I've seen under the skirt of were built between the 1950s-80s. Over time the average build quality has certainly diminished. OSB usage continues to increase despite its obvious problems. It's another casualty of population growth. Consumer goods are made of plastic, and your homes are increasingly made from glued together woodchips.