(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 8 of 8

Thread: Whats the difference between thin-set mortar and latex mastic? Whats more common?

  1. #1
    DIY Junior Member Arsinek's Avatar
    Join Date
    Mar 2013
    Location
    Florida
    Posts
    15

    Default Whats the difference between thin-set mortar and latex mastic? Whats more common?

    So Im about to start cutting my cement board and I came across something that said use the rough side of the board for thinset mortar and use the smooth side for latex mastic. I havent bought my tile and supplies yet so I dont know what Im going to be using. Whats the difference between thin-set mortar and latex mastic? Which should I use?

  2. #2
    DIY Junior Member Arsinek's Avatar
    Join Date
    Mar 2013
    Location
    Florida
    Posts
    15

    Default

    After looking around it looks like I want to use thinset. Mastic apparently isnt supposed to be used where theres high amounts of moisture.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,401

    Default

    REal thinset is a cement based product that cures into a rock-hard adhesive. It comes dry and you must mix it with the specified liquid (often just water). Mastics (sometimes they're incorrectly labeled thinset!) are a glue, pre-mixed in a bucket. They need to dry verses a thinset curing. The thing with a mastic is if it is placed under a nearly impervious tile (like say a porcelain or glass), it may take forever to dry out; and, if it's in a place where it can be continually wetted, may NEVER dry out. Until it dries, it can move around. Also, in the fine print, there's often a size limit on the tile - this again is because the stuff needs to dry, and since it normally does that through the grout line, a bigger tile limits the escape path for the moisture. FWIW, I had some mastic get on a piece of wood trim once. After a couple of months, I was able to wash it off, since water just softened it. Not something you want to use in an area that can get wet. Another FWIW, there isn't much difference in bond between the smooth and rough sides of cbu...don't worry - if you apply the thinset properly, it will stick to either side! If the cbu is being installed on a floor, make sure to use thinset UNDERNEATH it, per the manufacturer's instructions. This is to ensure you get 100% support underneath the cbu. Typically, when used on a wall, you'd put a vapor barrier up on the wall before installing the cbu (in say, a shower) unless you are planning a surface waterproofing material.
    Last edited by jadnashua; 04-14-2013 at 04:03 PM.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    ACO Shower Drain Sales johnfrwhipple's Avatar
    Join Date
    Jul 2009
    Location
    North Vancouver, BC
    Posts
    2,972
    Blog Entries
    5

    Default Whats the difference between thin-set mortar and latex mastic? Whats more common?

    post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-17-2014 at 05:58 AM.


    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.

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,401

    Default

    Often, thinset is less expensive than mastic. The difference comes in the additional time it takes to mix the thinset, verses just dipping some out of the bucket from the store. Labor can make the difference. But, except for dry areas, like maybe a kitchen backsplash, I'd not use mastic, and then, I'd think twice about it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    DIY Senior Member suceress's Avatar
    Join Date
    Mar 2008
    Location
    LA
    Posts
    151

    Default

    I'm glad this question was asked because I was wondering about this. What is "cbu"?

    johnfrwhipple, is there any particular brand of thinset you recommend or does it depend on the tile product being used?

  7. #7
    ACO Shower Drain Sales johnfrwhipple's Avatar
    Join Date
    Jul 2009
    Location
    North Vancouver, BC
    Posts
    2,972
    Blog Entries
    5

    Default

    post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-17-2014 at 05:59 AM.


    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.

  8. #8
    ACO Shower Drain Sales johnfrwhipple's Avatar
    Join Date
    Jul 2009
    Location
    North Vancouver, BC
    Posts
    2,972
    Blog Entries
    5

    Default

    post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-17-2014 at 05:59 AM.


    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. Whats wrong with this picture?
    By nola000 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 1
    Last Post: 06-27-2012, 06:07 PM
  2. whats up with my hot water??
    By dandawn86 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 1
    Last Post: 12-01-2010, 11:35 PM
  3. Here is whats Happening...
    By Cass in forum Computers and Stuff
    Replies: 18
    Last Post: 12-06-2009, 02:22 PM
  4. Uh...Ian.......Whats up with This ???
    By Scuba_Dave in forum Computers and Stuff
    Replies: 22
    Last Post: 11-21-2009, 01:56 PM
  5. whats that noise (dripping)
    By sonu_shawnee@yahoo.com in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 02-08-2005, 11:09 AM

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
  •