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Old 07-02-2012, 04:04 PM   #16
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How to put down bathroom tile correctly


Sorry, dumb question, but what does floor joists have to do with laying tile? Not being a smart ass, just really don't know. Wouldn't you put plywood over the floor joists then a subfloor? Is it if the joist are too far apart there might be flex in the floor and cause the tile to crack?


Also what is the ideal width for joist if supporting tile?

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Originally Posted by cleveman View Post
Hold your horses by golly!

Let's back up a bit.

If this floor is like the one in my home, the particle board is over 5/8" sheathing. So she won't need 3/4 plywood over the 5/8", rather 1/2" would do it, then the tilebacker.

But the question which needs to be answered first is the one which was initially presented: What size, span, and spacing are the floor joists? No sense in talking about the subfloor if the joists will never allow tile to be laid.

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Old 07-02-2012, 05:53 PM   #17
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How to put down bathroom tile correctly


They add the stiffens that keep the sub floor from bouncing up and down when you walk on it--

The amount that it moves as weight is placed on the joists is called deflection.

To much deflection and the grout or tile cracks.

Let us know the joist size (2x10 etc.--the unsupported length (wall to beam) and the type of wood (if you can see the mill stamp)

Or the type of joist if it is not solid 2x stock (I-joist--web joist or what ever)

One of us will run a deflection chart for you--Mike-
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Old 07-02-2012, 05:56 PM   #18
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How to put down bathroom tile correctly


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Originally Posted by jburchill
Sorry, dumb question, but what does floor joists have to do with laying tile? Not being a smart ass, just really don't know. Wouldn't you put plywood over the floor joists then a subfloor? Is it if the joist are too far apart there might be flex in the floor and cause the tile to crack?

Also what is the ideal width for joist if supporting tile?
Knowing the joist size and span determines the deflections for the plywood (movement) you put down, most joists are 2x 8 or 10 or 12 and could be spaced evenly where from middle of joist to middle of another joist would be 16" or 21" ect so knowing that determines if your safe for long lasting tile.
The short of it if you have 1" of plywood staggered correctly on 16" joist span you would be fine.

You can't be a tile setter with out knowing the carpentry behind it. Cynical statement maybe but there are those people out there that set tile and have not a clue about what's behind the tile.

Last edited by JetSwet; 07-02-2012 at 06:05 PM.
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Old 07-02-2012, 11:09 PM   #19
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How to put down bathroom tile correctly


Thanks for the tips guys. I'm not a tiler at all, I was just reading through the forums and found it curious. Now I'll go tile my bathroom....not really.

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