 And then it's tight at the house and it has more taper towards the outside of the deck. So when you install it, it gives it natural drainage. And you do that all within the joist bay. And then you overlap the layers and you put additional tape on to protect the screw head screws, excuse me, going in so that they don't leak. The whole idea is that you're creating a completely. Oh, and it also protects the joists in the framing.