On October 29, 2012 this question was asked on Green Building Advisor. The answers are useful to anyone who is building to make sure you meet all the guidelines and code requirements.
Here is an informational video on your solution to moisture problems behind stucco, cultured stone, natural stone thin veneer and masonry.
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This video discusses the need in green building for masonry walls to install a full-wall drainage mat using Keene Building Products’ CAV-AIR-ATOR™. Learn more about CAV-AIR-ATOR™