Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet

Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Tile Forum/Advice Board


Thread Tools Search this Thread
Unread 04-13-2021, 07:57 AM   #1
Registered User
Join Date: Apr 2021
Posts: 2
Ditra over OSB w/ Unmodified

I, like many others, used UNmodified thinset to install my Ditra over OSB.
I finished my shower floor, still having energy and thinset, I moved right to the bathroom floor.
However, unlike others, I finished laying my tile before realizing what I did wrong.

I used Mapei Uncoupling Membrane Mortar & 11" Hexagon Porcelain Tiles.
Its also only 37 Sq Ft of Ditra/Tile.

I'm really hoping I will be fine leaving it as is.
Lets hear it....

Thanks in advance.
Jacko96 is offline   Reply With Quote
Sponsored Links
Unread 04-13-2021, 07:59 AM   #2
Registered User
Join Date: Jul 2005
Location: Massachusetts
Posts: 1,027
I’d pull up the ditra. Unmodified doesn’t bond to osb.

At least the square footage isn’t that big. And better now than after toilet, sink, base trim etc are all installed.
Lou_MA is offline   Reply With Quote
Unread 04-13-2021, 11:37 AM   #3
Moderator emeritus
cx's Avatar
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 93,007
Welcome, Jack.

With that mortar I'd hafta agree with what Lou said.

My opinion; worth price charged.

cx is online now   Reply With Quote
Unread 04-13-2021, 11:42 AM   #4
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,382
What you might end up with eventually is effectively a floating floor held together by the thinset on top and the grout...if you start to hear crunching when walking on it, the grout joints will fail soon, and you'll have to deal with it. The likelihood is high that it will fail. Best to deal with it on your own timeline if you can.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
jadnashua is offline   Reply With Quote
Unread 04-13-2021, 12:23 PM   #5
Registered User
Join Date: Apr 2021
Posts: 2
Well I guess I'm not surprised as to what I should do.
I'm still considering leaving it as is and seeing how it holds up since it's my house and not a clients/friends house.

I plan to build a floating vanity, so if it the floor fails horribly, all I'll have to remove is toilet and baseboards to replace it.

So in this instance, would you guys suggest me using an epoxy grout or standard grout?
I was assuming epoxy grout for its strength but then I read that that would only "relocate" the stress to the tile and possibly crack a tile instead of the grout.
Jacko96 is offline   Reply With Quote

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help-unmodified thinset under Ditra kanga Tile Forum/Advice Board 3 02-04-2017 04:32 PM
Messed up & used unmodified under Ditra PeteCT Tile Forum/Advice Board 2 04-23-2011 04:43 PM
oops! unmodified under ditra? frank_shic Tile Forum/Advice Board 4 03-01-2011 04:07 PM
Always unmodified thin set over Ditra HemiMan2500HD Tile Forum/Advice Board 1 12-08-2006 10:46 PM
Ditra mortar- what is unmodified? jdkimes Tile Forum/Advice Board 24 09-29-2006 03:56 PM

All times are GMT -6. The time now is 08:35 AM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC