Remove or perforate original vapour barrier?

alan_s_thefirstAugust 9, 2012

Ok, one more question: If I'm going for an applied waterproofing agent - Kerdi, or a paint-on over backerboard, do I remove or perforate the original vapour barrier? One section of the shower - only around 2-3' x 1' - is on an outside wall. Should I do this, or should it remain as part of the building envelope? It would effectively sandwich the backerboard between waterproof membranes.

Thank you for reporting this comment. Undo
Dando

If your vapor barrier is on the outside of the house (outside of the studs), Leave it.

    Bookmark   August 9, 2012 at 5:14PM
Thank you for reporting this comment. Undo
alan_s_thefirst

It's on the inside, warm side of the studs, as per usual.

    Bookmark   August 9, 2012 at 6:01PM
Thank you for reporting this comment. Undo
mongoct

Leave the original vapor barrier intact and use a waterproof but not vapor proof barrier like Hydroban.

    Bookmark   August 9, 2012 at 10:10PM
Thank you for reporting this comment. Undo
alan_s_thefirst

It doesn't look like I can get Hydroban where I am and I don't have time to buy and ship...I was planning to use Redgard, but it looks like it's 100% waterproof, so I'd be back to the question of two barriers, so I guess the original one goes. Not sure what to do for a transition, but it's a small area above the shower, about 1' high, 2' long.

    Bookmark   August 10, 2012 at 9:10PM
Thank you for reporting this comment. Undo
kirkhall

Mongoct! Question that feeds off this question.

If one chooses to use hydroban (and it is not a vapor barrier) does one need to use a vapor barrier also (such as plastic sheeting behind the cement board)?

    Bookmark   August 11, 2012 at 10:06PM
Sign Up to comment
More Discussions
Bathroom
Walls are blue with red and royal blue towels white...
bobbyfly1
Ammara Designs Faucets
I've gotten so much information from these forums....
janelor
Trying to reconfigure master bath to include washer dryer
How does this layout look? how could I make this space...
cinnamon01
72 in vanity in a 77 inch space?
We have a small master bath that we are redoing. We...
katie111
Need bathroom sink/mirror/sconce advice asap!!
Hello everyone, we are in a total pickle over what...
Jenn Cassie
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™