Why your house doesn’t blow away 👍 #carpentry #framing #learn #build

Uplift explained. You have a ridge, rafter, decking, subfascia, double top plate, stud, bottom plate, deck subfloor, rim joist, mudsill, and anchor bolt. When wind blows against your house, it speeds up over your roofline. This can be two times as fast as the wind speed or even more. This wind against your house creates low pressure on the outside and [clears throat] high pressure on the inside. While it's often thought that you need wind to be pushing upward into a structure for it to lift the roof, that's not true. This low pressure creates uplift, just like an airplane wing. Let me demonstrate this principle. The wind flowing over the top of the paper lifts the paper up. This same concept is applied to your roof. In the case of a storm, if debris breaches a window or a door, this pushes your house apart. We rely on anchor bolts, hurricane ties, nails in your sheathing to keep these forces from pulling your house apart. On the exterior side, we count on the sheathing to hold all the way down to our mudsill. These red points here are critical locations. You want to avoid any sheathing seams to be in these critical locations cuz that's your exterior resistance to uplift. It's very important that you have the proper nailing for your double top plate and your mudsill. So, if you get these upward forces, it holds tight. This is the same concept if you remove your subfloor and you have a house on concrete. On the interior side, the uplift is resisted by your rafters running down to your double top plate, your hurricane tie goes down to your stud and your bottom plate, and your anchor bolt is what holds from uplift. In some cases, strapping is required as either on the interior side or the exterior. It's common that these get installed wrong, either too high or too low. It says plate line right here, and this sits at the top of the double top plate. This screw gets installed into your rafter at an angle and does the same thing. Thanks for watching.