[Greenbuilding] Exterior insulation retrofit

[Jason Holstine]

Bill,

Where are you located? Depending on availability, consider Roxul ComfortBatt
rockwool in the cavity. And on the outside sub the foam for Roxul¹s new
rigid board products from their commercial lines:
http://www.roxul.com/commercial/products/roxul+cavityrock%C2%AE

We¹re really high on these products to replace the emboddied costs of foams
and the overall performance characteristics of the rockwool.  They also have
a drainboard for wrapping subgrade foundations. BTW ­ any feedback or
experience from others on these boards?

The thing is availability in US is still sketchy. We¹re working on picking
it up but it¹s been a slow process.

Otherwise ­ the trickiest part of your plan is probably the details,
corners, joints and connections as you mention.


Jason Holstine

Amicus Green Building Center
³Sustain Your Space²
Member - USGBC, GreenAmerica, NARI, NAHB
e: jason at amicusgreen.com
w: www.amicusgreen.com
p: 301-571-8590
tf: 866-587-9140
f:  301-571-8597





On 4/28/11 8:45 AM, "bill.allen at verizon.net" <bill.allen at verizon.net> wrote:

> Hi all,
> 
> I am researching a project for my single family home. Classic 1926 stick
> construction. Zero insulation in the walls...time yet again for an external
> paint job. Would really appreciate comments on the following plan:
> 
> We never want to paint again...are thinking of natural cedar shingle siding,
> maybe with preservative but otherwise left natural.  Don't like the embodied
> energy in the various cement siding solutions....alternatives?
> 
> While the siding is down, fill the wall cavities with cellulous from the
> outside.
> 
> Replace original double hung windows with new construction insulated, R-5 if
> we can afford it, windows mounted "innie" on the plane of the original
> dimensional 1x lumber t+g sheathing.
> 
> Add external insulation....rigid styrofoam.  Since there is no interior vapor
> barrier (plaster on wood lathe), I am worried about the dew point ending up in
> the center of the wall...therefore, per the building science article, add 4"
> of styrofoam to the outside to keep the dew point external of the sheathing.
> 
> Will require careful details at windows and other penetrations.
> 
> Big job...has anyone done this?  Any comments on any part of the above would
> be most welcomed.
> 
> Thanks,
> Bill
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