(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 5 of 5

Thread: how to handle shower curb

  1. #1
    DIY Senior Member diyfun's Avatar
    Join Date
    May 2011
    Location
    MA
    Posts
    131

    Default how to handle shower curb

    I am learning a good way to handle shower curb (wood). I found there are three ways to take care of a shower curb:

    1. waterproof membrane with lath, then tiling on the top of it with thinset;
    2. waterproof membrane with plastic U cover, then tiling on the top of it with thinset;
    3. waterproof membrane, then tiling on top of it with thinset;

    I can see the #1 option is better. #3 is better than #2 if the membrane is not a regular smooth plastic membrane, like Oatey, I think.

    Basically the tile need to be bound well with the curb. smooth U cover and smooth plastic membrane will not help on the purpose. Some membrane like Kerdi and NobleSeal TS are not smooth surface but with fabric hairs which will be a good way to go with #3 above.

    What's your opinion?
    Last edited by diyfun; 11-18-2013 at 10:04 AM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,412

    Default

    The curb construction is one of the most messed up ones in the industry - it has to be done right, or it will eventually fail.

    1. You can't just wrap lath over the liner and then tile using thinset...you need to add a layer of mortar on the curb first to embed the lath and provide the desired slope. Then, you can add the thinset and tile (after the original mortar has set). You need a different, richer mix of mortar for strength, and to form than you use in the pan. This is the method used in a conventional shower. Getting the liner installed so it is waterproof, with the corners, etc., is very detail oriented.
    2. Not familiar with this as such...there are some foam curb assemblies designed for direct bonding a membrane such as Kerdi to. Schluter makes them, as do others (and you do not need to use Schluter's). These get bonded to the subfloor or slab with thinset. Only used with surface membranes for the most part, but you could treat it as in #1, but it would end up even bigger.
    3. You cannot apply Kerdi (or any of the shower membranes I'm familiar with) directly to wood...you need to cover the wood with one of the approved backer materials first. What is allowed is covered in their installation instruction manual. Then, it's similar to a wall/floor/corner situation. Schluter does have inside and outside corners to aid in keeping this waterproof, but they also have other methods that work.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member diyfun's Avatar
    Join Date
    May 2011
    Location
    MA
    Posts
    131

    Default

    Quote Originally Posted by jadnashua View Post
    The curb construction is one of the most messed up ones in the industry - it has to be done right, or it will eventually fail.


    3. You cannot apply Kerdi (or any of the shower membranes I'm familiar with) directly to wood...you need to cover the wood with one of the approved backer materials first. What is allowed is covered in their installation instruction manual. Then, it's similar to a wall/floor/corner situation. Schluter does have inside and outside corners to aid in keeping this waterproof, but they also have other methods that work.
    you are right. Because Kerdi needs to be "thinset"ed with the underneath structure which wood is not a good option.

    How about Kerdi on top of wood and then lath with mortar, and finally tile with thinset?

    Then I need to make lath by myself. Option 3 may be easier.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,412

    Default

    I'd use one of the approved methods. If you're going to use Kerdi, it is designed and only warrantied as a surface membrane, not as a conventional liner. I would not want to try to use lath with it as on a conventional liner...too easy to poke a hole with that sharp stuff. WOrks fine when installed as designed, though.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    ACO Shower Drain Sales johnfrwhipple's Avatar
    Join Date
    Jul 2009
    Location
    North Vancouver, BC
    Posts
    2,978
    Blog Entries
    5

    Default

    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-15-2014 at 03:15 PM.


    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

Similar Threads

  1. Lip/curb for a shower?
    By netrate in forum Shower & bathtub Forum & Blog
    Replies: 5
    Last Post: 09-02-2013, 10:54 AM
  2. Shower Curb / Custom Shower Questions
    By n0teye in forum Shower & bathtub Forum & Blog
    Replies: 3
    Last Post: 08-30-2011, 06:05 AM
  3. Place copper connection underground or in shower curb?
    By Ichthys in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 6
    Last Post: 01-03-2010, 06:46 AM
  4. Sunken Shower - depth, curb, or ramp
    By Jelly in forum Shower & bathtub Forum & Blog
    Replies: 3
    Last Post: 07-16-2009, 08:42 PM
  5. building a shower curb with composite pan
    By dirt diggler in forum Shower & bathtub Forum & Blog
    Replies: 4
    Last Post: 08-21-2007, 07:10 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •