[Greenbuilding] Exterior insulation retrofit

Clarke Olsen colsen at fairpoint.net
Thu Apr 28 08:22:43 PDT 2011


Paint will stay not peel off if you can leave some space behind the  
siding, making it a vented rain-shield.
I also feel that paint put on with a brush sticks better then  
sprayed....
Clarke Olsen
373 route 203
Spencertown, NY 12165
USA
518-392-4640
colsen at fairpoint.net




On Apr 28, 2011, at 8:45 AM, 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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