[Greenbuilding] Exterior insulation retrofit

Alan Abrams alan at abramsdesignbuild.com
Wed May 18 07:33:38 PDT 2011

> What is clear is that a small gap (say 1/16" or less) with a drain opening
> at the bottom only works very well as a drainage system and has a small
> impact on R-value.  How small? Hard to tell, but under 10%, and my best
> estimate is 3-5%.
> If you have larger gaps and vent openings top and bottom, then the loss
> will be greater and can be rather significant in theory.
> So, use a small gap and vent only.


what's your experience with drainage type rain screens, such as StuccoWrap
or its competitors, in this application?

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