When "dryvit "and other EIFs stucco's were introduced they were touted as waterproof stucco. The problem with dryvit is the polymer used to modify it is a very extremely lo-grade modifier. Dryvit is a ready to use material. It comes already mixed in the bucket "wet"...In the real world you want any mortar concrete or grout to cure on its own.. IF a modified mortar or cementious material is wet when you buy it then is applied to a wall then air dries its never going to fully cure. So when dryvit cracks and it will "even though its modified" water/moisture gets behind the dryvit material and re-wets the polymer and it crumbles and blows off. A good modifier will not re-wet. There are many kinds of modifiers: acrylics, Pva's, vae's eva's,sbr's all are used to modify mortars stuccos's cements etc. And there are combinations there of .... Using the right modifier for the right applications is a science in itself. Just because a company packages a material doesn't mean its any good. And just because a chemist makes a polymer doesn't mean he knows what its best use is or whether it has real world applications..
I knew Dryvit was junk when they opened the bucket and I saw it was wet and they said it was stucco..
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