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Old 03-24-2008, 07:33 AM   #1
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Tiling my kitchen floor, couple of questions


I want to tile my kitchen floor with 20"x20" ceramic tile. I want to pull up the 1/4" underlayment, then put down 1/4" cement board, then tile. Do I need to be worried about the weight issue on the floor due to the new tile? Do I have anything to be worried about or can I go ahead and get started?

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Old 03-24-2008, 01:11 PM   #2
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Tiling my kitchen floor, couple of questions


With the information you've provided, no one here can give yo any good information.

What type of joist do you have? And what's their spacing?
What kind of sub floor do you have? Thickness.
What kind of span do you have between joist supports?

If you're working with standard dimensional lumber, you can get an idea of the floors ability to support the load by using the Deflecto meter over at John Bridge's site...

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Old 03-24-2008, 02:55 PM   #3
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Tiling my kitchen floor, couple of questions


Here's a dumb question!

What kind of tile? Ceramic or stone?
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Old 03-24-2008, 03:23 PM   #4
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Tiling my kitchen floor, couple of questions


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Here's a dumb question!

What kind of tile? Ceramic or stone?

Ceramic
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Old 03-24-2008, 05:49 PM   #5
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Tiling my kitchen floor, couple of questions


That's in your favor!

Now:
What type of joist do you have? And what's their spacing?
What kind of sub floor do you have? Thickness.
What kind of span do you have between joist supports?
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Old 03-24-2008, 06:30 PM   #6
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Tiling my kitchen floor, couple of questions


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Originally Posted by Bud Cline View Post
That's in your favor!

Now:
What type of joist do you have? And what's their spacing?
What kind of sub floor do you have? Thickness.
What kind of span do you have between joist supports?
The kitchen is 13'x15', with the joists running in the 15' direction. They actually measure about 9". They are 16" on center. There is 1/2" plywood for the subfloor with I believe 1/4" underlayment on top of that. How can I beef up the floor? There is also a crawl space underneath so I have fairly easy access. Do I need some sort of vapor barier? Can I run supports down to the slab, and make the 15' span supported in the middle? How do I brace it?
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Old 03-24-2008, 08:26 PM   #7
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Tiling my kitchen floor, couple of questions


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I want to tile my kitchen floor with 20"x20" ceramic tile. I want to pull up the 1/4" underlayment, then put down 1/4" cement board, then tile. Do I need to be worried about the weight issue on the floor due to the new tile? Do I have anything to be worried about or can I go ahead and get started?
Things for worrying:
How strong is the floor as far as the amount of deflection it has...is it bouncy. If so, the joists may need to be stiffened so the tile doesn't crack.
How flat is the floor. The larger the tiles, the more critical the flatness of the sub-floor is.
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Old 03-24-2008, 09:27 PM   #8
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Tiling my kitchen floor, couple of questions


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Things for worrying:
How strong is the floor as far as the amount of deflection it has...is it bouncy. If so, the joists may need to be stiffened so the tile doesn't crack.
How flat is the floor. The larger the tiles, the more critical the flatness of the sub-floor is.
They probably need to be stiffened. Whats the best way to do this?
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Old 03-27-2008, 12:43 PM   #9
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Tiling my kitchen floor, couple of questions


From your dimensions your floor deflection doesn't meet L / 360 requirements. You need at least that to install ceramic. And L / 720 for stone installations.
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Old 03-27-2008, 02:25 PM   #10
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Tiling my kitchen floor, couple of questions


HOLD ON Yeti!

What EXACTLY is the free span of your floor joists? Measure it! Also try to determine the species of the lumber used for joists, there may be stamps somewhere.

Your conditions are marginal but if your actual span comes in under the stated 15 foot then you may get under the wire.
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Old 03-27-2008, 02:26 PM   #11
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From your dimensions your floor deflection doesn't meet L / 360 requirements. You need at least that to install ceramic. And L / 720 for stone installations.

We've determined it needs to be stiffened, the next question is what is the best way to do this? Can I just sister another joist onto the ones that are already there?
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Old 03-27-2008, 03:00 PM   #12
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Tiling my kitchen floor, couple of questions


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HOLD ON Yeti!

What EXACTLY is the free span of your floor joists? Measure it! Also try to determine the species of the lumber used for joists, there may be stamps somewhere.

Your conditions are marginal but if your actual span comes in under the stated 15 foot then you may get under the wire.

The span is about 15 1/2', do you think the 1/2' is enough to make a big difference? Also, there are two feet of cabinets along the one wall where there will be no tile.
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Old 03-27-2008, 04:49 PM   #13
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Tiling my kitchen floor, couple of questions


Yes it needs to be improved. If the span was around 14 feet you would be in under the radar but you didn't make it.

Is there a basement?
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Old 03-27-2008, 07:08 PM   #14
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Tiling my kitchen floor, couple of questions


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Yes it needs to be improved. If the span was around 14 feet you would be in under the radar but you didn't make it.

Is there a basement?

crawl space
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Old 03-27-2008, 09:15 PM   #15
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Tiling my kitchen floor, couple of questions


Beam and jack it midspan.

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