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Old 03-25-2012, 12:16 PM   #1
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installing hardy backer board for floor tile installation


Hi, I am attempting to install hardy backer board over a 3/4" sub floor. My question is should the backer board be installed with the grain of the plywood or against the grain of the plywood? Or does it really make a difference either way? Just an FYI the floor joists are 12" on center. Any Information will be helpful.

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Old 03-25-2012, 01:42 PM   #2
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installing hardy backer board for floor tile installation


Don't think it matters but make sure none on the edges of the backerboard fall on the joints/edges of the subfloor.

Are you going to be laying the backerboard in a bed of mortar AND screwing it down? Or are you only going to screw it down?

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Old 03-25-2012, 05:29 PM   #3
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Mortar and screws.
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Old 03-25-2012, 06:55 PM   #4
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installing hardy backer board for floor tile installation


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Mortar and screws.
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Old 03-25-2012, 08:05 PM   #5
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installing hardy backer board for floor tile installation


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Are you going to be laying the backerboard in a bed of mortar AND screwing it down? Or are you only going to screw it down?
Trick question there. You do not have a choice.

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Old 03-26-2012, 11:57 AM   #6
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installing hardy backer board for floor tile installation


Some DIYers don't know that there is not a choice.

Doesn't matter which direction the cement board goes.

The other question would be what kind of screws are being used for the cement board?
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Old 03-26-2012, 12:52 PM   #7
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installing hardy backer board for floor tile installation


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Some DIYers don't know that there is not a choice.
What bothers me is how many so called pros that don't know how to install CBU's correctly.

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Old 03-26-2012, 02:03 PM   #8
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installing hardy backer board for floor tile installation


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Trick question there. You do not have a choice.

Jaz

Yes it was a trick question. Unless of course you want your grout to crack.
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Old 03-26-2012, 02:06 PM   #9
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What bothers me is how many so called pros that don't know how to install CBU's correctly.

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I like to use the term pro loosely as a cynical reference to some one who knows how to do it as pose to some one who does not know how to do it.
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Old 03-26-2012, 02:11 PM   #10
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installing hardy backer board for floor tile installation


We needed about 450 sq feet of floor tile laid. Had a local guy come in for quote. Said he used hardibacker for the underlayment and that he screws it down. no need to set the hardibacker in mortar.

At that point I knew that hardibacker says to install in mortar and screw down. I figured either the guy was not knowledgeable or was trying to cut corners. Needless to say he did not get the job.
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Old 03-28-2012, 07:51 PM   #11
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installing hardy backer board for floor tile installation


I used to be surprised how many people who charge to install tile but don't know the right way to do things.

Any new info or thoughts?

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Old 03-31-2012, 01:40 PM   #12
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installing hardy backer board for floor tile installation


Anyone know thre best type of mastic for installing cement baker board to a 3/4" plywood sub floor?
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Old 03-31-2012, 04:02 PM   #13
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installing hardy backer board for floor tile installation


Mike,

You should use thinset mortar, not mastic. Thinset is much better, you'll also need it for the tiles, and it's cheap too. Thinset comes in powder form in a bag, do not use anything that is pre-mixed.

What brand of backer board are you using? What kind of tiles are you installing?

Jaz

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