I am wondering why EIFS is almost never mentioned in this website. It seems to offer it all: a spray-on or rolled-on WRB that also performs as an air barrier; a drainage plane; outsulation that also provides a thermal break; a finish surface that doesn’t require painting. Talking to my local installers, I’ve learned that 4” of foam costs little more than 1”. Adding 4” of EPS to a 2×4 bay with dense-pack or sprayed cellulose results in about an R-29 wall assembly that is relatively economical. If one opts for “innie” windows at the drainage plane, this wall assembly seems to be simpler to build than many that are advocated in these pages again and again. Getting it to airtight also seems straightforward.
So my question is, why is this system not suggested as a great alternative?
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