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Old 08-26-2011, 12:15 AM   #1
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Laying tile


Hi folks. First time laying tile. I had removed the old tile and I was having a hard time removing the remaining thinset on the floor. After debating with myself for a while, I decided to remove the 3/8" plywood.

The subfloor is 3/4" OSB (I think the faded text on the board says 23/32" - but not sure about that), and it is glued on to the joists and between seams. The joists 2x10 and are 16" OC. The joists are supported at their ends by the foundation walls and in the middle by an I-beam. The I-beam is about 12-14 feet (paced it off ) from the wall. The I-beam is supported by metal posts about 10 feet apart.

Only one of the old tiles had cracked, and that one looked like there wasn't enough thinset under it. This is a 25-year old house. So it seems like having a 3/8" plywood worked fairly well.

I want to avoid using thinset or something similar to glue plywood/cement board directly on to the subfloor. Just in case I, or the next owner, want to change the tiles.

So, how would you suggest I prepare for the tiles? Put 3/8" plywood on the subfloor using nails as before? Use 3/8" cement board? What is the advantage of cement board versus plywood?

Thanks for any and all advice.

Jae

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Old 08-26-2011, 05:35 AM   #2
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I checked the deflection and your floor is fine for tile---(not natural stone)

Add the 3/8" bc plywood then add 1/4" wonder board or Durrock.(set in thinset and nailed or screwed.

The cement board is best --Great bond --Plywood often fails to bond properly.

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Old 08-26-2011, 08:55 AM   #3
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Plywood is inferior for setting tile on for a variety of reasons...This is one of the things we've learned since your house was built 25 yrs ago. Just because the previous tile bonded ok to the plywood doesn't mean the new tile will. Each tile is going to perform a little different and using the concrete backerboard assures a stable and consistent bond that is impervious to moisture. Like Mike said, set it in thinset and screw the backerboard down on a 6 inch grid. Also, be sure to use construction adhesive underneath the 3/8 BC to eliminate squeaks and movement. Good luck
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Old 08-26-2011, 09:41 AM   #4
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Thanks Mike and Blue. I will do as you suggest. Now after seeing how much trouble this could be, I'm thinking about putting down laminate wood until my wife decides what she wants to do with the kitchen.

The tiles would have been for the entryway and short hallway leading in.

And, Mike, we're almost neighbors
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Old 08-26-2011, 02:55 PM   #5
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There is a fine tile setter down your way---Angus ---Look at contractor talk (link below)

I just finished a job in Will County---Welcome--Mike---
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Old 08-26-2011, 03:32 PM   #6
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Quote:
I want to avoid using thinset or something similar to glue plywood/cement board directly on to the subfloor. Just in case I, or the next owner, want to change the tiles.
That would go against everything the cement board makers tell you about installing their products. Cement board is to be installed in a fresh bed of thinset.

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