[Greenbuilding] Thin High R-value insulation for exterior

[Lynelle Hamilton]

Hi All:

Again, I turn to this list for advice.

My house is durisol block, but I want to add 12-15R insulation to the 
exterior, in part to reduce heat loss from the webs of the block, and 
partially because I want R40-R43 walls.

I have reclaimed 3" SM Board (blue EPS)  to put on the outside of the 
durisol.

The facing is manufactured stone.  I have had 3 masons look at the 
property.  One mason says no problem attaching the stone to the durisol 
through the 3" EPS, the other two say well.,....can't you find something 
else?   They point to the possibility that the screws needed will bend 
in the EPS, allowing the block to sag.

Both say spray on closed cell insulation provides too uneven a surface 
to attach lath and stone.

So, has anyone done what I'm doing? What was the result? Alternately, 
does anyone know of anything with grater rigidity than the EPS, perhaps 
with higher R-value per inch, that would work?

Please don't point me to the engineer....he says this is out of his scope.

Many, many thanks!

Lynelle
-- 
Effective immediately, please use the following e-mail address to reach 
me: lynelle at lahamilton.com