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Old 12-31-2009, 08:36 PM   #1
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24" O.C. with tile?


I did a bit of searching, and read about grout giving way etc, but I just tore out the sub floor and discovered 24" on center framing, with what appears to be 7/8" plywood in my small 5x3 powder room. No previous squeaking etc.
Am I going to have a problem using 1/4" hardi screwed to it? The first step into powder room is directly on a stud, the second step is the toilet, is this small of a span enough to worry about?

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Old 12-31-2009, 08:37 PM   #2
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24" O.C. with tile?


What size floor joists ?

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Old 12-31-2009, 09:29 PM   #3
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24" O.C. with tile?


And.... just as important, how far do they span between bearing?

Be safe, Gary
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Old 12-31-2009, 10:41 PM   #4
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24" O.C. with tile?


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Originally Posted by GBR in WA View Post
And.... just as important, how far do they span between bearing?

Be safe, Gary

Why would the span matter from the standpoint of getting enough rigidity between the joists? Just curious.

16" oc with 3/4 inch and 1/4 backer board didn't really work for me. Maybe that gets to the span Gary is referring to.

Did you actually remove the subfloor, or did you tear down to it?

If it was me with 7/8 subfloor I think I'd go for 1/2 inch durock. It's just a lot stronger than 1/4 inch hardiboard.
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Old 12-31-2009, 10:51 PM   #5
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24" O.C. with tile?


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Why would the span matter from the standpoint of getting enough rigidity between the joists? Just curious.
A 2x10 spanning 8' is a lot different from a 2x10 spanning 16'
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Old 01-01-2010, 11:45 AM   #6
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24" O.C. with tile?


Man I hate crawling under houses, puts it right up there with a poke in the eye. I'm not certain the size of the joist yet, all I did was tear out the 1/2" particle board and linoleum. This is one reason I wanna stay with 1/4" hardie. Tile and hardie will put me back to the same height without a transition for people to catch their foot on.

Here's what I'm workin with:



Under the house they are 2x10's, the 3rd joist spans about 5 feet from the foundation to a 4x4 post, the second joist spans to a 4x4 about 8ft away from foundation wall. The whole right side of the bathroom is a foundation wall between house and garage. I also plan on using rather large tile if that matters at all.

Last edited by jackie treehorn; 01-01-2010 at 12:43 PM.
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Old 01-01-2010, 01:05 PM   #7
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24" O.C. with tile?


Long as there are no refers or chest freezers, baby grand's on the other side of the wall....... http://www.johnbridge.com/vbulletin/deflecto.pl
Watch for isolating the tile from the floor, minimum thickness base of plywood, and other concerns besides strength.
Be safe, Gary
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Last edited by Gary in WA; 01-01-2010 at 01:09 PM.
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Old 01-01-2010, 01:41 PM   #8
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24" O.C. with tile?


You should check the Schluter website (they make Ditramat), lots of good information on required thickness of subfloor for various spacings of joists. As I recall, they do not recommend tile installation on less than 1 1/4 total thickness of subfloor, typically consisting of two layers of minimum 5/8 inch each. Hardiboard does not count in this equation, since it adds no strength. Particle board is not recommended due to problems with dimensional changes if it gets wet, the recommended subfloor would be exposure rated plywood.

As for the 24 inch spacing of the joists, that gets to the question of the L/D flexure of the floor. The minimum required L/D depends on the type of tile, large format (16 inch square or bigger) porcelain requires an L/D of 1/720 as I recall, typically not going to happen with 24 inch spacing. Smaller format tiles do not need as rigid a floor, you still need to check it, that is what Scuba is talking about.
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Old 01-01-2010, 02:10 PM   #9
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24" O.C. with tile?


Technically there is tile in our entryway, house is 7 years old, and it has no signs of cracking. But because I don't want to end up redoing things and I've already pulled everyting out of garage to get under house I decided I'd re-inforce the floor from underneath. Better to be safe than sorry.
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Old 01-01-2010, 04:38 PM   #10
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24" O.C. with tile?


That was zero fun. I've got it taken care of now, thanks for the help!!

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