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Cement Backer Board Over Concrete Slab

 
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Old 12-20-2010, 06:44 PM   #1
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Cement Backer Board Over Concrete Slab


Hi! All, I have a question regarding the hardie cement backer board apply on concrete slab.

The kitchen that Im working on has concrete slab, Im putting a 3/8 porcelain tile in the kitchen floor. I want to raise the floor as much as possible to match the adjacent living room floor level (about 1-1/8).

So Im planning to apply thin set over concrete slab, then put hardie backer board over it, then lay down thin set on top, and put the 3/8 porcelain tile at last. (the whole assembly may not be 1-1/8 but close enough for me)

I know that hardie manuf. wont warranty their product if it applies on the concrete slab directly. I also know that many people in the forum points out that I should not do it either. Here are my questions:

1) If I dont care about the factory warrant, do you guys think that it is OK to use hardie backer board over concrete? If not, why?
2) How do I secure the board to the slab, would thinset be enough, or do I need to put additional screws to the slab?
3) What screw should I use?
4) What is the better way to raise the floor other than using backer board? I try not to use self-leveling concrete or similar method since it is too difficult for me to do. Do you guys have other recommendation?


Thanks a lot for your help
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Old 12-20-2010, 06:47 PM   #2
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Re: Cement Backer Board Over Concrete Slab


I don't see a big issue going directly over a clean concrete slab.

However, using CBU over concrete is a big no-no. If you need to raise the height, use a SLC (self-leveling compound).

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Old 12-20-2010, 07:10 PM   #3
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Re: Cement Backer Board Over Concrete Slab


He said leveler is too hard for him to do.

Easy is what he needs.

I'd just lay all the hardi down and duct tape the joints.
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Old 12-20-2010, 07:38 PM   #4
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Re: Cement Backer Board Over Concrete Slab


Mike, I'll bet ya a roll of duct tape that Angus will disable this conversation and send it to the DIY chatroom....
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Old 12-20-2010, 09:08 PM   #5
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Re: Cement Backer Board Over Concrete Slab


Quote:
Originally Posted by Mike Finley View Post
He said leveler is too hard for him to do.

Easy is what he needs.

I'd just lay all the hardi down and duct tape the joints.
No. Packaging tape is what you want to use. It's like a moisture barrier too
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Old 12-20-2010, 09:40 PM   #6
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Re: Cement Backer Board Over Concrete Slab


two layers of tile, duh.
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Old 12-20-2010, 09:53 PM   #7
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Re: Cement Backer Board Over Concrete Slab


Just use cardboard, cheaper and it's going to fail anyway.
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Old 12-20-2010, 10:15 PM   #8
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Re: Cement Backer Board Over Concrete Slab


Why on earth would you not care about the manuf. warranty???

Do you care how long your installation lasts?

Do you care about who pays for the fix if there's a problem?

Is this for your own house or someone else's?
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Old 12-20-2010, 11:27 PM   #9
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Re: Cement Backer Board Over Concrete Slab


I smell the fragrance of a DIY'er that thinks he is smarter than the rest of us and can learn some trade secrets by lying about his trade. I think you guys are being hoodwinked.
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Old 12-20-2010, 11:35 PM   #10
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Re: Cement Backer Board Over Concrete Slab


Come on Angus, You didn't recommend Ditra XL that will get him a 1/4
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Old 12-20-2010, 11:37 PM   #11
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Re: Cement Backer Board Over Concrete Slab


Actually, 5/16"
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Old 12-20-2010, 11:44 PM   #12
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Re: Cement Backer Board Over Concrete Slab


I won't doubt you if you say so.
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Old 12-21-2010, 12:56 AM   #13
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Re: Cement Backer Board Over Concrete Slab


I'm siting here trying to come up with something witty to type but you guys are too good!
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Old 12-21-2010, 07:43 AM   #14
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Re: Cement Backer Board Over Concrete Slab


Quote:
Originally Posted by gtimk4 View Post
Hi! All, I have a question regarding the hardie cement backer board apply on concrete slab.

The kitchen that Im working on has concrete slab, Im putting a 3/8 porcelain tile in the kitchen floor. I want to raise the floor as much as possible to match the adjacent living room floor level (about 1-1/8).

So Im planning to apply thin set over concrete slab, then put hardie backer board over it, then lay down thin set on top, and put the 3/8 porcelain tile at last. (the whole assembly may not be 1-1/8 but close enough for me)

I know that hardie manuf. wont warranty their product if it applies on the concrete slab directly. I also know that many people in the forum points out that I should not do it either. Here are my questions:

1) If I dont care about the factory warrant, do you guys think that it is OK to use hardie backer board over concrete? If not, why?
2) How do I secure the board to the slab, would thinset be enough, or do I need to put additional screws to the slab?
3) What screw should I use?
4) What is the better way to raise the floor other than using backer board? I try not to use self-leveling concrete or similar method since it is too difficult for me to do. Do you guys have other recommendation?


Thanks a lot for your help
Exact same post is on the DIY board.
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Old 12-21-2010, 09:46 AM   #15
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Re: Cement Backer Board Over Concrete Slab


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