Can ditra and HardieBacker Fiber Cement be used together?


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Old 07-07-19, 11:29 AM
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Can ditra and HardieBacker Fiber Cement be used together?

Hi,
I'm looking for more information on if ditra and cement board can be installed together

specs:
16" OC
3/4 plywood
tiles being installed 12x12 porcelain
subfloor secured with added screws
subfloor uneven.
 
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Old 07-08-19, 06:01 AM
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size of joist 2x10

The ditra installation guide states that i need a minimum of 5/8 sub floor thickness, i currently have 3/4in
online they states that when installing tile, subfloor needs to be a thickness of 1-1/4
when reading Stanley tiling book, it states that if using ditra raising the floor is not necessary since ditra is design to provide the necessary support.
 
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Old 07-08-19, 06:53 AM
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ditra is design to provide the necessary support.
Ditra is a waterproof membrane, it supplies no support!
 
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Old 07-08-19, 03:47 PM
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Caution as cement board will absorb moisture and make it tough to get a good bond with the ditra. Ditra needs unmodified thinset. You need to wet the surface of the cement board before applying unmodified. The wetness makes the unmodified difficult to work with and if you don't get the ratio right, it won't stick. Did it once, will never do it again. Way too much involved.
 
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Old 07-08-19, 03:58 PM
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So when I did my shower I used Prova, they recommend modified thinset. Been close to 10 years, still water tight!
 
 

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