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-   -   Shower moisture barrier question (http://www.diychatroom.com/f19/shower-moisture-barrier-question-184898/)

detroittigerfan 08-06-2013 11:28 PM

Shower moisture barrier question
 
When you install poly sheeting behind cement board I understand you should let the sheeting drape over the tub/shower lip then cut off remaining afterwards. Reason behind this is so if water does get behind the cement board and to the sheeting it will flow back out over the lip into the tub/shower. Here is what I am confused by. After the cement board is installed and tiling is done your obviously supposed to caulk the bottom gap so when you do that your basically sealing that gap up so even if water did reach the sheeting how could it drain out?

joecaption 08-07-2013 06:47 AM

Should have waterproofed the face of the tile board not add a vapor barrier behind it.
Tile board and grout are not waterproof so why allow it to work it's way in behind the tile board so mold can form on the back side?
The way your suggesting you would have to leave gaps in the caulking to drain it.

oh'mike 08-07-2013 08:27 AM

What Joe said----


The plastic behind the board is not needed if you waterproof the face of the board---
I never could see the benefit of plastic over the studs---

detroittigerfan 08-07-2013 10:55 AM

Quote:

Originally Posted by oh'mike (Post 1226249)
What Joe said----


The plastic behind the board is not needed if you waterproof the face of the board---
I never could see the benefit of plastic over the studs---

Ok and doing plastic sheeting behind the board and water proofing the front is a no no, correct?

joecaption 08-07-2013 10:58 AM

That would be a double vapor barrier which is sure to cause issues.

oh'mike 08-07-2013 10:58 AM

It's not the best practice, but if you waterproof correctly, I doubt of any thing bad will happen---the plastic is perforated with nails and screws and no moisture will reach the plastic===


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