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Discussion Starter · #1 ·
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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Paul
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This guy. I've torn out hundreds of showers. Maybe 5 have been built properly. Three of those were mud. I don't suspect I'll ever find one that someone went through the trouble of doing two moisture barriers. Hell, I'm surprised to find one nowadays lol. I can't remember the last time I demoed a pan that was built right....
 

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what theory are you trying to prove? there are things called moisture meters ya know. they even make ones for concrete..
 

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damn, just looked to see who the op was again... you know what the hell is out there! and how to prove it! or at least i thought you did... lol
 

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Discussion Starter · #6 ·
This guy. I've torn out hundreds of showers. Maybe 5 have been built properly. Three of those were mud. I don't suspect I'll ever find one that someone went through the trouble of doing two moisture barriers. Hell, I'm surprised to find one nowadays lol. I can't remember the last time I demoed a pan that was built right....
How true! I remember a plumber several years ago telling me no one does a preslope except for me and one other guy in an $$$$$ suburb.
 

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ok...so while you guys are here....lol, what do you recommend.....

pre slope with mortar, moisture barrier, then the final slope with mortar, then tile? have one coming up soon....so double checking....and since you guys have not seen one done right in ages, can you tell me what youd like to see?
 

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Paul
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ok...so while you guys are here....lol, what do you recommend.....

pre slope with mortar, moisture barrier, then the final slope with mortar, then tile? have one coming up soon....so double checking....and since you guys have not seen one done right in ages, can you tell me what youd like to see?
I only use liquid or sheet membranes. I cannot stand the idea of a mud bed sitting there soaked in water - pre-slope and weep holes or not. Why have it if it's not necessary?
 

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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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Discussion Starter · #12 ·
Yes it could drain into a traditional mud pan quite easily. But if there were a membrane pan, it might trap water in wall due to less permable grout or thinset.

Where's J.W. and his testing when you need him?
 
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