Return to the Bathrooms Forum | Post a Follow-Up

 o
Remove or perforate original vapour barrier?

Posted by alan_s_thefirst (My Page) on
Thu, Aug 9, 12 at 14:55

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.


Follow-Up Postings:

 o
RE: Remove or perforate original vapour barrier?

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


 o
RE: Remove or perforate original vapour barrier?

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


 o
RE: Remove or perforate original vapour barrier?

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


 o
RE: Remove or perforate original vapour barrier?

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.


 o
RE: Remove or perforate original vapour barrier?

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)?


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Bathrooms Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here