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Old 07-13-2008, 02:57 PM   #1
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Allowable floor variations for tile?


I am planning to lay travertine tile on my basement slab (I will be using ditra as the uncoupling underlayment). I have a 6 foot level that I have been walking around with to check the flatness of the floor with. What are allowable variations for tile floor when measuring in a 6 foot distance? I would like to have 1/16th inch grout lines and use 16X16 tiles.

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Old 07-13-2008, 03:28 PM   #2
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Allowable floor variations for tile?


The maximum allowable variation is 1/4" in 10'.

The larger the tiles the more important it is for the substrate to be plane.

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Old 07-13-2008, 03:39 PM   #3
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Allowable floor variations for tile?


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The maximum allowable variation is 1/4" in 10'.

The larger the tiles the more important it is for the substrate to be plane.
So if I were to choose 12X12 tiles how much with the 1/4" increase to? Will the ditra help minimize some of the surface variations(i would assume it would)?
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Old 07-13-2008, 09:54 PM   #4
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Allowable floor variations for tile?


Tiger,

Years ago the concrete finisher's lobbyists were able to get the spec changed from "within 1/8" in 10 ft. and 1/16" in 12" of the required plane" to within 1/4" in 10 ft., .........

The 1/4" in 10 ft. spec is fine with 12-13" tiles with 'cushioned' edges, set at about 3/16-1/4" apart. However larger tiles, especially natural stone and rectified porcelain set close together is virtually impossible to install without lippage under those conditions. There are special thinsets and installation aids that will help, but it takes lots of skill and extra $$$ to set them right. Darn tiles just do not want to bend to the contour of the floor.

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Old 07-13-2008, 10:14 PM   #5
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Allowable floor variations for tile?


Well, i have a couple 1/8 inch cracks that generate a ridge between both sides of the crack. If you set a 6 foot straight edge over the center of the crack one end will project up into the air almost 1/3 of an inch(3 feet away from the crack). Is there anything I can do about this? or will the Ditra minimize the effects of the crack? Other than this crack the rest of the floor is fine.
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Old 07-13-2008, 10:32 PM   #6
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Allowable floor variations for tile?


Assuming it's 3/8" in 3 ft. gee...that's a lot. I could see and feel that even if you installed carpeting. That's 4-5 times more than the allowable amount if you wanted to get good results. It's up to you.

Depending on the layout of the room you might be able to level the floor with self leveling cement or patching cement products.

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Old 07-14-2008, 06:38 AM   #7
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Allowable floor variations for tile?


thanks.
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Old 07-14-2008, 08:50 AM   #8
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Allowable floor variations for tile?


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Well, i have a couple 1/8 inch cracks that generate a ridge between both sides of the crack.
So....is this a living crack? meaning does this ridge come and go with seasonal changes?
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Old 07-14-2008, 09:04 AM   #9
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Allowable floor variations for tile?


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So....is this a living crack? meaning does this ridge come and go with seasonal changes?
No. I have not noticed the crack change at all since I moved in in 2005.

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