Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-03-2011, 08:54 AM   #1
Newbie
 
Join Date: May 2011
Posts: 5
Rewards Points: 0
Share |
Default

All My Tile is Cracking Please Help!!


4 years ago I installed 234 sq ft of 12 x 12 tile with thin set mortar in my kitchen.

I have a 70 yr old raised house with 19 1/2" oc 2" x 9 1/2" (actual measurement) joists spanning 12 ft.
The subfloor is 3/4" x 6" wood planks laid diagonally.
Above that i nailed with a framing gun, a 3/4" T&G sub floor.
I used framing nails with glue on them.

I put the tile directly on top of that with thinset mortar.

The tile is cracked to the outline of the T&G subfloor, the cracks are exactly where the 3/4" T&G subfloor butts together. I weigh 290 lb. and occaisionally have heard the tile crack as i walked on it. What have i done wrong?
I now, want to remove the cracked tile and start over.
What shoud i do?


Last edited by Jplster; 06-03-2011 at 09:04 AM.
Jplster is offline   Reply With Quote
Old 06-03-2011, 09:06 AM   #2
I have gas!
 
Clutchcargo's Avatar
 
Join Date: Mar 2007
Location: Massachusetts
Posts: 1,774
Rewards Points: 14
Default

All My Tile is Cracking Please Help!!


A couple of questions.
What was the orientation of the new T&G subfloor; parallel or perpendicular to the joists?
What size are the joists?

__________________
I tear things down and build them up.
Clutchcargo is offline   Reply With Quote
Old 06-03-2011, 09:45 AM   #3
Newbie
 
Join Date: May 2011
Posts: 5
Rewards Points: 0
Default

All My Tile is Cracking Please Help!!


the joist span 12 ft. their actual size are 2 x 9 1/2 inches, I crawled under the house and measured them. they are 19 1/2 inches apart.
I laid the 3/4" T&G plywood perpendicular to the joists.
Jplster is offline   Reply With Quote
Old 06-03-2011, 10:37 AM   #4
I have gas!
 
Clutchcargo's Avatar
 
Join Date: Mar 2007
Location: Massachusetts
Posts: 1,774
Rewards Points: 14
Default

All My Tile is Cracking Please Help!!


I think what's happening is that you didn't use a decoupling component like hardiboard or ditra. So the differing expansion/contraction of the building materials is causing the tiles to loosen.
Someone with more experience can pipe in.
__________________
I tear things down and build them up.
Clutchcargo is offline   Reply With Quote
The Following User Says Thank You to Clutchcargo For This Useful Post:
rusty baker (06-03-2011)
Old 06-03-2011, 11:08 AM   #5
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 3,862
Rewards Points: 16
Default

All My Tile is Cracking Please Help!!


Quote:
Originally Posted by Clutchcargo View Post
I think what's happening is that you didn't use a decoupling component like hardiboard or ditra. So the differing expansion/contraction of the building materials is causing the tiles to loosen.
Someone with more experience can pipe in.
What you said sounds good to me.
__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is online now   Reply With Quote
Old 06-03-2011, 11:34 AM   #6
Tileguy
 
Bud Cline's Avatar
 
Join Date: Mar 2006
Posts: 10,174
Rewards Points: 28
Default

All My Tile is Cracking Please Help!!


...and this is why you don't install ceramic tile directly to pywood.

In addition, the underlayment probably should have been installed in two layers because of the 19.2" joist separation and the joist spanning being extended to the limits.
__________________
XXX
Bud Cline is offline   Reply With Quote
Old 06-05-2011, 02:50 PM   #7
Newbie
 
Join Date: May 2011
Posts: 5
Rewards Points: 0
Default

All My Tile is Cracking Please Help!!


Underlayment like ditra will not stop the floor from flexing up and down, it does stop expansion and contraction. The solution is to either add more floor joists or to put in a felxible tile. The diagonal 1 x 6 subfloor has too far to travel between joists, 27.5", so with the subfloor flex and the joist flex it is too much for the ceramic tile.

Last edited by Jplster; 06-05-2011 at 02:54 PM.
Jplster is offline   Reply With Quote
Old 06-05-2011, 05:25 PM   #8
Tileguy
 
Bud Cline's Avatar
 
Join Date: Mar 2006
Posts: 10,174
Rewards Points: 28
Default

All My Tile is Cracking Please Help!!


Quote:
The solution is to either add more floor joists or to put in a felxible tile. The diagonal 1 x 6 subfloor has too far to travel between joists, 27.5", so with the subfloor flex and the joist flex it is too much for the ceramic tile.
Which is why a "double layer" of subfloor is required so as to reduce deflection of the subfloor material BETWEEN THE JOISTS.
__________________
XXX
Bud Cline is offline   Reply With Quote
Old 06-05-2011, 06:53 PM   #9
DIY staff
 
Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 21,664
Rewards Points: 92
Default

All My Tile is Cracking Please Help!!


Joists deflection is acceptable for ceramic 465 if the joists are hem/fir--

You need durrock or ditra--Wood expands and contracts tile does not--the cement board will help-------The double layer of underlayment could not hurt.

Also check on the humidity of the area below---I've seen a damp basement damage a tile floor above it.--Mike--

__________________
New members: Adding your location to your profile helps in many ways.--M--
oh'mike is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tile over Tile ?? Piney Flooring 17 02-06-2012 09:59 PM
Vertical tile on wall poolecw Flooring 2 06-01-2010 10:05 AM
Replace kitchen tile without moving cabinets and countertop stubits Tiling, ceramics, marble 7 02-18-2010 10:56 AM
Trimming installed tile with tile blade in normal circular saw? jdraughn Tools 5 12-13-2009 09:07 PM
Where do I make my tile cuts for the wall? petsparkle Kitchen & Bath Remodeling 6 04-25-2009 10:00 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.