The Tyvek/FroggToggs question is a good one.
To answer someone (I think chris) on the breathability of Tyvek and other housewraps. They are supposed to allow water vapor out and prevent water and wind from coming in. My dad just installed some on his new addition. He was supposed to bring me some to test, but hasn't yet. He did not have a big enough piece left for a ground cloth test. However, somewhere on the web I read that you could "test" Tyvek by forming a "pocket" and pouring water into it. One direction it holds the water and the other it weeps.
Does anyone have any experience making Tyvek accessories? I am especially interested in making a Tyvek ground sheet with sewn in footbag.
Thanks for any help and insight that can be given.