[Greenbuilding] Thin High R-value insulation for exterior

[Vadurro, Rob, EMNRD]

Here in NM, we regularly stucco over foam boards or spray-on foam. What
I've found is that 2" is the maximum thickness that the screws (for the
stucco netting) available will reliably support the stucco (about 1" of
cement, sand mix). I assume a similar structural problem exists for your
stone veneer? You can go with the XPS (extruded polystyrene) which has
more structural value and better insulation, but has a
worse-for-the-environment blowing agent than EPS (expanded polystyrene).


Rob Vadurro AIA, LEED AP
Park Architect
New Mexico State Parks
P.O. Box 1147
Santa Fe, NM 87505
505-476-3383
505-476-3361 (fax)

-----Original Message-----
From: greenbuilding-bounces at lists.bioenergylists.org
[mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of
Lynelle Hamilton
Sent: Saturday, October 30, 2010 7:29 AM
To: greenbuilding at lists.bioenergylists.org
Subject: [Greenbuilding] Thin High R-value insulation for exterior

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

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