[Greenbuilding] Exterior insulation retrofit

[John Straube]

Roxul is now available in the US.  They tripled their plant capacity and now return phone calls and even give good pricing.

John

On 2011-04-28, at 10:10 AM, Jason Holstine wrote:

> Bill,
> 
> Where are you located? Depending on availability, consider Roxul ComfortBatt rockwool in the cavity. And on the outside sub the foam for Roxul’s new rigid board products from their commercial lines:
> http://www.roxul.com/commercial/products/roxul+cavityrock%C2%AE
> 
> We’re 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. We’re working on picking it up but it’s been a slow process.
> 
> Otherwise – the trickiest part of your plan is probably the details, corners, joints and connections as you mention.
> 
> 
> Jason Holstine
> <image.gif>
> Amicus Green Building Center
> “Sustain Your Space”
> 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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Dr John Straube, P.Eng.
Associate Professor
University of Waterloo
Dept of Civil Eng. & School of Architecture
www.buildingscience.com

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