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-   -   Tiling over T&G (http://www.diychatroom.com/f5/tiling-over-t-g-145709/)

Didymus21 06-02-2012 11:20 AM

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.

http://img526.imageshack.us/img526/5...0208171169.jpg

Uploaded with ImageShack.us

Bob Mariani 06-02-2012 04:14 PM

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

oh'mike 06-02-2012 06:36 PM

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--

Didymus21 06-02-2012 08:11 PM

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.

joecaption 06-02-2012 08:29 PM

Undersized floor joist, over double the normal spacing, anyone else think tile is a very bad idea?

Didymus21 06-02-2012 08:50 PM

Quote:

Originally Posted by joecaption (Post 934777)
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...

oh'mike 06-02-2012 08:58 PM

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.

Didymus21 06-02-2012 09:13 PM

Quote:

Originally Posted by oh'mike (Post 934801)
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.

http://img41.imageshack.us/img41/24/...2180752491.jpg

http://img268.imageshack.us/img268/3...2180647332.jpg

Uploaded with ImageShack.us

http://img214.imageshack.us/img214/1071/47939313.jpg


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.

oh'mike 06-02-2012 09:33 PM

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---

Didymus21 06-02-2012 11:06 PM

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?

oh'mike 06-02-2012 11:13 PM

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.

Didymus21 06-02-2012 11:27 PM

Quote:

Originally Posted by oh'mike (Post 934948)
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?

farmall 06-03-2012 06:45 AM

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.

oh'mike 06-03-2012 06:49 AM

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

Farmall has a good suggestion---

Didymus21 08-13-2012 03:18 PM

Quote:

Originally Posted by farmall (Post 935050)
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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