[Greenbuilding] Exterior insulation retrofit

[John Straube]

Yes.  As in you install R20 and get R18. 

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-----Original Message-----
From: Reuben Deumling <9watts at gmail.com>
Date: Fri, 29 Apr 2011 10:00:51 
To: <jfstraube at gmail.com>; Green Building<greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] Exterior insulation retrofit

On Fri, Apr 29, 2011 at 9:58 AM, John Straube <jfstraube at gmail.com> wrote:

> Relatively small impact if you limit the connections to the minimum. We
> lose about 3% with screws doing foam and maybe up to 10% with thin plywood
> webs. Just add an inch if you care.
>
10% relative to what? An ideal wall that has no plywood gussets?

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