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Unread 10-01-2012, 12:23 AM   #1
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Bathroom Vapor/water barrier sandwich

Decided to tear out a bathroom and a large closet and make a walk-in closet and TWO bathrooms, (guest and a master). Don't have too much experience with remodeling but I watch a lot on TV so I figured it would 3 weekends (one week end for each room.....just kidding) I have been lurking here for the past couple of months to learn everything I need to" get er done"... Contractors told me 3-4 weeks so I figured 3-4 months. I am on track for 4 months, everything takes longer than planned.
On to my question. Vapor/water barrier sandwich... Since I am in CA I am going to hot mop the pan. If I put a 6mil behind the Hardie and then Hydroban on top, when water penetrates the Hardie it will run down the 6mil into the pan then out the weep holes. Am I missing something???
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Unread 10-01-2012, 12:38 AM   #2
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Welcome, Jeremy.

If you put poly behind your wallboard, you have already provided a sufficient water containment system for your shower. Adding a direct bonded waterproofing membrane on the inside of the shower would be a substantial waste of effort and dinero.

If you install a direct bonded waterproofing membrane on the inside of your shower, there will be no water penetrating your wallboard.

Laticrete does recommend exactly what you suggest for their steam shower constructions. If you wanna do that, it's entirely up to you. I personally think it a poor idea.

My opinion; worth price charged.
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Unread 10-01-2012, 02:28 AM   #3
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So from your experience would I be better using 6mil behind or HydroBan on top of the Hardie. (Assuming costs are not an issue.)
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Unread 10-01-2012, 10:09 AM   #4
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Yes, or.
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Unread 10-01-2012, 04:20 PM   #5
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That's a good noncommittal answer.... And I thought this was an easy question. Thanks for the help
<<<<<Heading off the bathroom to screw it up without anyone's help.....>>>>>>
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Unread 10-01-2012, 04:25 PM   #6
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Either of those methods works just fine, Jason. Dealer's choice.
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Unread 10-01-2012, 04:36 PM   #7
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There's three ways of doing it:
  • plastic behind the cbu
  • a liquid on top of the cbu, like the HydroBan that you mentioned
  • or a fabric on top, think Noble or Schluter

All are approved ways with different costs. It's up to you which one you want.

There's also the option of putting plastic behind and a liquid over. The consensus on this board is that this is a no-no, but as CX mentioned, this exact option is spec'd for steam showers so, again, it's up to you to pick an option and go for it.
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