Return to the Bathrooms Forum | Post a Follow-Up

 o
Best way to build shower pan?

Posted by potty (potty@optonline.net) on
Fri, Nov 30, 12 at 7:30

Building a new bathroom in my house and could use some input on the best way to do the shower pan.
Is it best to put down tar paper, wire mud then membrane and more mud?


Follow-Up Postings:

 o
RE: Best way to build shower pan?

There are two families of thought, both are fine. The most important thing to remember is that your membrane needs to be sloped.

I prefer a topical membrane over a membrane buried between two layers of mud. Simply because it affords better control over moisture within the pan.

Here's the "old way", with the CPE or CPVC membrane buried between two layers of mud. Courtesy of Harry Dunbar.

My preslope is thicker than Harry's, a little over an inch at the drain then sloping up towards the walls. And I don't use latex admix in the mud.

Shifting gears to the "second" method:

With a topical membrane, you can use one sloped layer of deck mud. The membrane gets installed on the sloped mud. Then you tile on the membrane. A couple of types of topical membrane:

You can use Hydroban over sloped mud. If you can get a magic trowel like they use in this video, your installation will be a breeze.

Or Kerdi Membrane over sloped mud.

There are a few other topical membranes, but in general they are intended for use on walls only. To use them on a shower floor requires fiddling with the mud around the drain and the drain itself, etc. Hydroban and Kerdi fully warrant their materials and methods when used as shown above.

If I had to chose a "best way" I'd use Hydroban with the flanged drain.

If I needed "bulletproof vapor control for a steam shower" then I'd use Kerdi.

If you want the "best way to do a CPE/CPVC shower", follow Harry's methods.


 o
RE: Best way to build shower pan?

Thanks for the help, that hydroban looks pretty sick!


 o
RE: Best way to build shower pan?

Mongoct,

One of my shower quotes is for the way it is shown in the "old way" link. In that link, it shows a step where the walls got cement board, but he doesn't show what went behind it. Is either building paper or plastic considered a "good" way to waterproof behind the cement board?


 o
RE: Best way to build shower pan?

" Is either building paper or plastic considered a "good" way to waterproof behind the cement board?"

Yes, properly detailed tar paper or 6-mil poly is fine behind 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.
  • 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