Ceramic Over Luann

 
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Old 11-29-2006, 09:46 AM   #1
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Ceramic Over Luann


Hey folks,

i was wondering if setting ceramic tile over luann would be ok. We had a kitchen floor that was originally supposed to be vinyl squares, laid 1/4 inch luann over 1/2" cdx to patch a few week spots in the floor. After we finished nailing the luann down every 4" with 1 1/2 " ring shank nails, the homeowner and i decided to lay ceramic tile instead of vinyl squares down. i plan on putting 12x12 ceramic tile on the floor. i would rather not add cement board to the floor because of height requirements.
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Old 11-29-2006, 11:27 AM   #2
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Re: Ceramic Over Luann


Tough situation. I feel for you.

Tear up the Luan if height is an issue. Do not tile over the luan.

Luan is to smooth, it can release oils that will inhibit the bond of the thinset and it has no compression strength. The Luan could compress when you roll something heavy over it like a full fridge and result in popping or cracked tiles over time.

Hope this helps. Good luck.

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Old 11-29-2006, 02:38 PM   #3
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Re: Ceramic Over Luann


What's under the CDX?, that should be removed also.
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Old 11-29-2006, 07:26 PM   #4
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Re: Ceramic Over Luann


Quote:
Originally Posted by R&D Tile View Post
What's under the CDX?, that should be removed also.
Didn't catch that. Good look R&D. 1/2 inch cdx:rolleyes
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Old 11-30-2006, 07:45 AM   #5
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Re: Ceramic Over Luann


Here are a couple of webpages I found, very interesting reading concerning sub-floors and backer-board:

http://www.ctioa.org/reports/fr81.html

http://www.ctioa.org/reports/fr46.html

Hope it helps.
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Last edited by dayspring; 11-30-2006 at 07:50 AM.
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Old 11-30-2006, 07:56 PM   #6
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Re: Ceramic Over Luann


The tile industry specifically excludes the use of luan as a substrate for any tile installation.

Luan has a low compressive strength, little tensile strength, and is known to delaminate simply from the moisture in the tile adhesive. Therfore tile cannot be installed directly over luan and it also cannot be in a floor sandwich as a sub-underlayment due to it's minimal laminations .
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Old 12-01-2006, 02:11 PM   #7
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Re: Ceramic Over Luann


so can i tile of luan???

just kidding
ray
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Old 12-06-2006, 08:28 PM   #8
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Re: Ceramic Over Luann


You need an inch and a quarter under tile. Like 3/4 subfloor and 1/2 cement board. You dont want the floor to be spongy below your tile.
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Old 12-11-2006, 09:49 PM   #9
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Re: Ceramic Over Luann


too much deflection = cracking.

solid as you can on the substrate.
Luan is at the bottom of the list
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Old 12-11-2006, 10:43 PM   #10
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Re: Ceramic Over Luann


Luan has very thin laminates and the bonding glue is not waterproof. The moisture in the thinset could set off a bad chain reaction. (top laminate swelling, loosening)
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Old 12-12-2006, 02:31 PM   #11
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Re: Ceramic Over Luann


Quote:
Florcraft: "too much deflection = cracking.
solid as you can on the substrate.
Luan is at the bottom of the list"
Actually, luan IS NOT "at the bottom of the list."
Luan isn't even on the list.

In fact, LUAN IS SPECIFICALLY EXCLUDED from all lists with the exception of one, and that is the list of materials that should never be used in a tile substrate.
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Old 12-12-2006, 03:35 PM   #12
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Re: Ceramic Over Luann


put down a nice wet bed and then just put reducers at the doors
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Old 12-12-2006, 05:41 PM   #13
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Re: Ceramic Over Luann


luan is for canoes and hockey sticks
not houses
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Old 12-12-2006, 06:07 PM   #14
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Re: Ceramic Over Luann


Quote:
Originally Posted by MattCoops View Post
luan is for canoes and hockey sticks
not houses
Use lots of epoxy with both.
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Old 12-12-2006, 07:03 PM   #15
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Re: Ceramic Over Luann


The truth is....

Luan is used (after flooring underlayment) primarily for furniture drawer-bottoms and furniture backs. Even as an underlayment under sheet flooring it is still a poor choice.
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Old 12-13-2006, 06:24 PM   #16
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Re: Ceramic Over Luann


Luan is to tile like Kryptonite is to Superman. NEVER use it. It'll "delaminate" faster than you can say.......well, whatever...
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Old 12-13-2006, 09:04 PM   #17
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Re: Ceramic Over Luann


So I think the general consensus is:

Don't keep the Luan.

Though what to do to fix it... you're on your own there.
(might just have to pull the floor)

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Old 12-20-2006, 11:11 AM   #18
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Re: Ceramic Over Luann


Quote:
Actually, luan IS NOT "at the bottom of the list."
Luan isn't even on the list.

oops, I meant to say Luan is at the bottom of my drawer

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