When JRB announced their 2G weather-shield I wondered at the placement of the sil high and dwr low. Based on Shug's experiment I see that having a porous strip at the bottom gives at least a chance for pooled persperation to get away.
BUT the reason I wondered was that heat rises, vapor rises, I would expect that having breathable material high would let it out more easily than having it low will sil high. Also, breathable material high is less exposed to wind blown weather from under the tarp, you get more protection from sil low.
So DWR high and sil low is would I would have anticipated. The Jacks aren't dummies though. Other opinions???