<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">StuccoWrap is the only one we have tested, and it drains like a dream. Not at all obvious it would work so well, hence wy we tested it. Tested behind polyiso on board, behind stucco, behind XPS, behind fiber cement.<div><br><div><div>On 2011-05-18, at 10:33 AM, Alan Abrams wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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%.<br>
If you have larger gaps and vent openings top and bottom, then the loss will be greater and can be rather significant in theory.<br>
So, use a small gap and vent only.<br></blockquote></div><br>JS--<br><br>what's your experience with drainage type rain screens, such as StuccoWrap or its competitors, in this application?<br><br>AA<br>
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