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Hi! All, I have a question regarding the ½” hardie cement backer board apply on concrete slab.

The kitchen that I’m working on has concrete slab, I’m 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 I’m planning to apply ¼” thin set over concrete slab, then put ½” hardie backer board over it, then lay down ¼” 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. won’t 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 don’t 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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Carpe Diem
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20,533 Posts
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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Paul
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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 :thumbsup:
 

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Builder/Remodeler
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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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Tile Contractor
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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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Flooring Installer
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796 Posts
Hi! All, I have a question regarding the ½” hardie cement backer board apply on concrete slab.

The kitchen that I’m working on has concrete slab, I’m 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 I’m planning to apply ¼” thin set over concrete slab, then put ½” hardie backer board over it, then lay down ¼” 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. won’t 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 don’t 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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Carpe Diem
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