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Unread 08-28-2011, 02:11 PM   #1
nickelhorse221
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Replaced subfloor need help with tile. Been 10 years since i've touched a tile projec

So i've read all kinds of posts on here and they are great. I'm concerned about a project i'm about to take on. I used to install a lot of tile but havent done any in over 10 years. I have my new subfloor down, OSB and it's solid. I would like input on what size Durock to use on the OSB. It's my breezeway and bathroom. The OSB down is 22/32 now. Things have changed a lot in the years, but I always liked Durock. Any suggestions on the size, also type of thinsets and mortars? I'm putting down a basic 12" tile, but this is a high traffic area. Have about 100sf to cover.

Thanks

Helenn
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Unread 08-28-2011, 03:31 PM   #2
Lazarus
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Helenn~Assuming it passes the "Deflecto" test.....use the Deflecto in the toolbar at the top of the page, all you should need is the 1/4" Durock to provide a good "bite" for the tile to adhere to. Bear in mind that you need to spread some thinset over the OSB and "bed" the Durock into it...screw it down as it should be and the floor is good to go....
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Unread 08-28-2011, 03:57 PM   #3
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Welcome, Helenn.

Have you evaluated the joist system over which you installed the OSB? You can get a quick go/no-go from our Deflectometer in the dark blue bar above.

You should read and follow the manufacturer's instructions for the CBU you intend to use. USG, like all other makers of CBU known to me, recommends or permits the use of their thinnest panels on floor installations unless you particularly need the added height.

My opinion; worth price charged.
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Unread 08-28-2011, 04:21 PM   #4
nickelhorse221
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Well it passes the deflection at the top for ceramic or natural stone
So that's a relief. Now to convince my other half that where we did not
Replace subfloor the old asbestos tile does need to come up before
Durock goes down! Thanks for all the help I'll need it taking on
My first project in this long
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Unread 08-28-2011, 04:48 PM   #5
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I worry about that, Helenn. It's very unusual for a joist structure to meet the deflection requirements for natural stone unless natural stone was written into the original building plan. Happens by coincidence now and again, but not commonly. Would you care to describe for us just what you have for a structure there?

Was the new OSB subflooring of he tongue & groove variety?
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Unread 08-28-2011, 07:29 PM   #6
nickelhorse221
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Talking

Of course. I may have put Something in the deflecto and that
Would be a good thing to know. I have solid 2x8 joists. They are
14 inch on center and best we can measure due to this being a repair
And not putting in the joists they are 10ft again as best we can measure.
The wood is not notty or weak. It had 3/4 inch plywood which
Was stripped due to a water leak that we have no idea how long it
Went on. Just bought the house in January. The OSB is of the tounge
And groove type. I was planning to do durock over this. 1/4 inch but
Now my husband is asking to put Hardiebacker down. I've never
Used anything but durock. Any thoughts and am I way off on
My subfloor? When I installed tile years ago subfloors were already
There for me so I'm a subfloor novice thanks for all the help
You all are amazing sources of info and I am becoming less nervous about
DoIng tile again
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Unread 08-28-2011, 08:40 PM   #7
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You do understand we're looking for the unsupported span of the joists, Helenn? Hasn't anything to do with the size of the room your tiling. Just trying to be sure you're using the correct data here.

Either Durock or Hardibacker will serve your purpose for the tile installation. Easiest just to tell Mr. Helenn that you're right and be done with that, eh?

Durock does not come in a 1/4" board to the best of my knowledge. Their thinnest I believe is 5/16" thick.

My opinion; worth price charged.
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Unread 08-29-2011, 10:33 AM   #8
nickelhorse221
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Wink

Good to know. Like I said, no subfloor experience here, just putting ceramic down. Looks like unsupported maybe 4-5 feet. It's just the small bathroom and breezeway. hardiebacker goes down with the thinset as well I assume?

Thanks again

I will tell Mr. Helenn to be quiet
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Unread 08-29-2011, 11:19 AM   #9
cx
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Quote:
Originally Posted by Helenn
Looks like unsupported maybe 4-5 feet. It's just the small bathroom and breezeway.
Helenn, again, it matters not a whit how large or small the rooms to be tiled, that has no bearing at all on the joist structure. You must determine the unsupported span from below the joists. That's the only place you can see what's supporting the joists and how far they're spanning. It's important.

My opinion; worth price charged.
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