Adding new mortar to shower pan

Reply

  #1  
Old 05-29-20, 11:06 AM
C
Member
Thread Starter
Join Date: Sep 2017
Location: USA
Posts: 66
Received 1 Vote on 1 Post
Adding new mortar to shower pan

I have a shower pan poured for a roughly 3í x 4í shower. I just finished Redgarding the floor, but just noticed that the slope on the back wall dips about .75Ē in the middle, which will be a problem for leveling my wall tiles along the floor. The slopes towards the drain are fine, itís just the slope along the back wall. If I want to add more mortar to fill this in and level it off, will I need to scrape off the Regard in that area, or should the mortar bond ok to the Redgard? Should I be putting a small layer of thin set in between the two layers of mortar?
 
Sponsored Links
  #2  
Old 05-29-20, 12:32 PM
Marq1's Avatar
Member
Join Date: Sep 2016
Location: USA MI
Posts: 5,864
Received 275 Votes on 256 Posts
Redguard is an elastomeric waterproofing membrane, mortar will not stick to it, you know the answer, it should have been thoroughly checked before coating.

I would not trust applying anything over this!
 
  #3  
Old 05-29-20, 02:00 PM
C
Member
Thread Starter
Join Date: Sep 2017
Location: USA
Posts: 66
Received 1 Vote on 1 Post
What about if I applied a thin layer of thin set over the area that Iíll fill with mortar? The thinset sticks to the Redgard for the tile application, after all.

Alternatively, if I donít fix the slope am I essentially just left with either shaving some of the tiles on the bottom row and/or getting creative with my grout lines?
 
  #4  
Old 05-30-20, 12:21 AM
Marq1's Avatar
Member
Join Date: Sep 2016
Location: USA MI
Posts: 5,864
Received 275 Votes on 256 Posts
After thinking about this, I would just use some latex modified mortar and fill in the low spot. Not the best solution but you really dont have any other option.
 
  #5  
Old 06-01-20, 04:40 PM
C
Member
Thread Starter
Join Date: Sep 2017
Location: USA
Posts: 66
Received 1 Vote on 1 Post
Use latex modified thinset mortar, or are you talking about a different kind of mortar? I've read that thinset shouldn't be applied thick as it will crack and shift around, so that's why I didn't think I could go that route.
 
  #6  
Old 06-01-20, 06:27 PM
Marq1's Avatar
Member
Join Date: Sep 2016
Location: USA MI
Posts: 5,864
Received 275 Votes on 256 Posts
Were talking the same item, mortar is what the pan is constructed with, latex modified mortar/thinset is used to attach the tiles. The latex additive greatly increases the overall bond strength.

You would never apply thinset this thick for a tile application but your building up a low area and you noted a couple thin layers will minimize cracking as the material cures!
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: