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proving there is a moisture sandwich

4226 Views 11 Replies 5 Participants Last post by  GO Remodeling
Anyone tearout a vapor barrier/cement board/vapor barrier shower wall? Find any moisture in the cbd?

What way could we test this theory?
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I for one, do not buy into the "sandwich".
1. Most membranes used on the surface of the board meeting ANSI 118.10 pass very little water. A perm rating of 1. Can pass 38.4 oz of water vapor per 100 sq. ft. Per 7 days of continuous use. ( nobleseal is 0.15 )We are talking showers not steam here.
2. If water got into the wall it would /could , just drain out the bottom of the " vapor" barrier into the pan.
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