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

Sponsors


Reply
 
Thread Tools Search this Thread
Old 11-02-2009, 10:36 PM   #1
Steve in Liberty
Registered User
 
Join Date: Nov 2009
Posts: 3
premixed thinset vs. actual thinset mortar on floor

I am on the verge of installing floor tile in a remodeled bathroom. The base is 3/4 inch t&g plywood with 1/4 inch Hardy - board attached with "premixed thinset" and the special Hardy screws. I then installed a Warm-Wire floor and covered this with Custom Building Products floor leveling compound. Seems smooth as glass, and as level as I can measure. 1) Should I be OK to proceed laying the floor tile (Dal-tile octagon with dot), and 2) should I use pre-mixed thinset (which I understand to not be thinset at all, but an organic mastic) or mix-with-water thinset mortar to attach the tile? If the premixed mastic is not good on the floor, is it OK to use to attach wall tile? Thanks.
__________________
Steve
Steve in Liberty is offline   Reply With Quote
Sponsored Links
Old 11-02-2009, 10:41 PM   #2
Deckert
Remodeling and Tile Contractor
 
Join Date: Oct 2006
Location: Kirkland, WA
Posts: 2,113
Use mix with water thinset. I wouldn't have used the pre-mixed to set my hardi either.
__________________
Brannigan
Facilities Manager, TPC Snoqualmie Ridge
Reformed Remodeler and C54 Tile Contractor
HeenanGC.com
Deckert is offline   Reply With Quote
Old 11-02-2009, 10:57 PM   #3
cx
da Home-builder -- Moderator-at-Large
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 85,238
Welcome, Steve.

Wish you hadn't installed the HardiBacker over that organic adhesive. Even James Hardi, who usta say you could do that, has come to his collective senses and removed it from the latest installation instructions I've seen.

Some of the "pre-mixed thinsets" will even say not to use'em to set CBU on floors.

But that's done, eh?

Setting the tiles with the stuff in residential applications is technically acceptable, although some "pre-mixed thinsets" will have tile size limitations and perhaps other cautions.

We generally recommend folks use real cementitious thinset mortars for all CBU installations on floors and for nearly all other tile installations.

The organic adhesives (your pre-mixed thinset mortar) are usually recommended by the folks hereabouts only for setting tiles on walls in dry locations. Kitchen backsplashes and such.

But it's up to you what you wanna use.

We'll presume you've determined your joist structure is suitable for a tile installation? And the joist spacing with that single layer of subflooring is suitable as well?

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Old 11-03-2009, 09:11 AM   #4
Steve in Liberty
Registered User
 
Join Date: Nov 2009
Posts: 3
How relieved I am ... just checked with my son who helped me put in the Hardi Board back in the summer. He reminded me that in fact we DID use the dry thinset rather than the organic. AND we are over 2x10's on 16 ench centers, 14 foot span.

My follow up queries are -- 1) is the organic-based mastic still OK to use for installing 3x6 subway wall tile? and 2) for installing floor tile that is fairly small (Dal-Tile hexagon/dot), what sort of trowel notch size/shape should be used with the genuine-article thinset that I WILL be using?

Thanks for your advice. Steve in Liberty
__________________
Steve
Steve in Liberty is offline   Reply With Quote
Old 11-03-2009, 09:14 AM   #5
cx
da Home-builder -- Moderator-at-Large
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 85,238
Technically, yes to both.

I personally would not, however, set any floor tiles with mastic for any reason.

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Old 11-03-2009, 10:35 AM   #6
bbcamp
Registered User
 
Join Date: Jul 2002
Posts: 30,274
I think CX mis-read your second question, so I'll try to answer it. Use a 3/16" by 1/4" V-notch or 1/4" square notch (held at a low angle) to comb out your thinset. The rules are the same for any size tile: Use the smallest notch that gives you nearly 100% coverage without excessive thinset ooze between the tiles. With such a small notch, your floor will need to be pretty flat.
bbcamp is offline   Reply With Quote
Old 11-03-2009, 10:40 AM   #7
Steve in Liberty
Registered User
 
Join Date: Nov 2009
Posts: 3
I think I am now straight on materials to use. The rule is : OK to use organic mastic on wall tile (outside a wet area, of course) but very ill-advised to use anything but genuine thinset water-mix mortar on floor.

I plan to use a 3/16 " V-shape -grooved trowel for putting down the water-mixed thinset. Seems like this is the consensus from other threads I have read. I am going at this tonight, so I'll come back to read any response before I head to Lowes tobuy the thinset mix. Steve.
__________________
Steve
Steve in Liberty is offline   Reply With Quote
Old 11-03-2009, 11:40 AM   #8
cx
da Home-builder -- Moderator-at-Large
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 85,238
Passed onna trowel size. Don't got no good eye-dee how large his "octagons and dots" might be.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   Reply With Quote
Reply

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
wall repair:Thinset mortar vs premixed ? canoeist11 Tile Forum/Advice Board 7 07-05-2007 08:22 AM
mastic or thinset or premixed thinset MarkSL Tile Forum/Advice Board 15 11-03-2006 07:27 AM
premixed thinset martie Professionals' Hangout 42 02-16-2005 08:33 PM
premixed thinset chast45 Tile Forum/Advice Board 4 10-21-2003 08:45 PM


All times are GMT -6. The time now is 08:37 PM.


Sponsors

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2014 John Bridge & Associates, LLC