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Old 06-02-2012, 10:20 AM   #1
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Tiling over T&G


What's best practice before laying down tile?


This is what I'm dealing with. How do I ensure I have a nice and isolated, level area to lay tile? The T&G is 1" thick.



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Last edited by Didymus21; 06-02-2012 at 10:24 AM.
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Old 06-02-2012, 03:14 PM   #2
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Tiling over T&G


Cover this with 3/4" plywood and then 1/4" cement board

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Old 06-02-2012, 05:36 PM   #3
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Tiling over T&G


Bob has it----natural wood moves a lot--top that with BC exposure one plywood--1/2" will do--3/4" is better--then lay on a cement board 1/4" set in thinset and nailed or screwed--now you have a good safe base for tile.


If you will give us the joist size--spacing--grade(if youcan find that) and the unsupported length--someone here will check the joist deflection and let you know how strong your floor system is--
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Old 06-02-2012, 07:11 PM   #4
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Tiling over T&G


Wow, guys, thanks! The joists are roughly 3.75"X7" and they are spaced every 52." The previous owner put 1/4 cement board right over the tongue and groove.
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Old 06-02-2012, 07:29 PM   #5
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Tiling over T&G


Undersized floor joist, over double the normal spacing, anyone else think tile is a very bad idea?
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Old 06-02-2012, 07:50 PM   #6
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Tiling over T&G


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Originally Posted by joecaption View Post
Undersized floor joist, over double the normal spacing, anyone else think tile is a very bad idea?
Really? It has supported a cast iron bathtub the last 45 years without issue...
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Old 06-02-2012, 07:58 PM   #7
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Tiling over T&G


Double check that 52" number--I see rows of nails every 16" or so in the picture.

Also those joists--how long is the unsupported span? Measure from the foundation to the center beam if it's the first floor--or outside wall to nearest supporting wall.
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Old 06-02-2012, 08:13 PM   #8
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Tiling over T&G


Quote:
Originally Posted by oh'mike View Post
Double check that 52" number--I see rows of nails every 16" or so in the picture.

Also those joists--how long is the unsupported span? Measure from the foundation to the center beam if it's the first floor--or outside wall to nearest supporting wall.
Maybe these will clear up some of the confusion about spacing.





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I guess I'm confused....isn't the distance between joists going to be the same thing and the largest unsupported span? It's a ranch style home. I believe the exterior walls are the only supporting walls.

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Old 06-02-2012, 08:33 PM   #9
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Tiling over T&G


Sorry I questioned you---you are seriously over span for tile---

The tongue and groove flooring may flex to much over a 52" joist opening--use the 3/4" ply and realize that this floor will be a risk---
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Old 06-02-2012, 10:06 PM   #10
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Tiling over T&G


Am I correct in assuming the risk is only that I may have cracked grout lines/tile in the future? Or, is the weight risking my subfloor integrity?
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Old 06-02-2012, 10:13 PM   #11
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Tiling over T&G


Your house is fine--the floor system might be to flexible for a 'guaranteed not to fail' tile job.

If you don't mind taking a risk--tile it--you may be just fine--if it fails--next time use hardwood or aanother floor covering that can take some movement of the floor.
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Old 06-02-2012, 10:27 PM   #12
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Tiling over T&G


Quote:
Originally Posted by oh'mike View Post
Your house is fine--the floor system might be to flexible for a 'guaranteed not to fail' tile job.

If you don't mind taking a risk--tile it--you may be just fine--if it fails--next time use hardwood or aanother floor covering that can take some movement of the floor.
Appreciate all the help. I have 3/4 Top Choice Oak Hardwood plywood pieces left over from another project. Would these be OK to use? I'm just trying to get rid of it at this point.

This stuff: http://www.lowes.com/pd_59298-99899-...7C1&facetInfo=

I see now it says for interior use....so I'm thinking probably not... Would pressure treated plywood be overkill?

Last edited by Didymus21; 06-02-2012 at 10:33 PM. Reason: New information
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Old 06-03-2012, 05:45 AM   #13
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Tiling over T&G


I think that the only way to even think that this would work would be to go underneath, put blocking every 16 inches (2 x 10) then install 3/4 t and g plywood, ditra then tile. You really don't want dimensional lumber in the equation as a subfloor. It would be nice if you could remove it and replace with plywood. I am not sure how much trouble that would be for you.
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Old 06-03-2012, 05:49 AM   #14
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Tiling over T&G


You need exterior glue---so buy bc exterior--

Farmall has a good suggestion---
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Old 08-13-2012, 02:18 PM   #15
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Tiling over T&G


Quote:
Originally Posted by farmall View Post
I think that the only way to even think that this would work would be to go underneath, put blocking every 16 inches (2 x 10) then install 3/4 t and g plywood, ditra then tile. You really don't want dimensional lumber in the equation as a subfloor. It would be nice if you could remove it and replace with plywood. I am not sure how much trouble that would be for you.

Based on the attached pictures, could someone explain (like you are talking to a two year old) exactly how I would block this to make it a little more stable for tile? I see what Farmall wrote, but I'm a visual person and I'm having trouble picturing it...so I'm stuck.

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