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Contractor
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According to John Bridge forums regular sheetrock is good and the search function here turned up a lot of good advice about Green Eboard, but it doesn't look like my market has it (mid-lower Delaware).

Is Durock or Hardi and a modified thinset to embed the Kerdi preferred or sheetrock with an unmodified for embedding the Kerdi?
 

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I've used drywall and cbd,too. I prefer the cbd. If there is a plumbing leak you could have the drywall fail. Cbd would survive.

Also, for towel bars or other penetrations, cbd is stronger imo.
 

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Is Durock or Hardi and a modified thinset to embed the Kerdi preferred or sheetrock with an unmodified for embedding the Kerdi?

Chevy, No Modified Thin-set with Kerdi, I use Kerdi Board Myself.
 

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Talking Head
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DensArmor is my favorite for ease of use but it's hard for me to get so I mostly use Permabase. Durock is about the same. I'm not a fan of Hardiboard. That dust is brutal.
 

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Plus the screwing and taping it with Fibafuse is a heck of a lot faster than with the cbu. Just remember to wear gloves. DensArmor will tear your hands up pretty badly.
 

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bathroom guru
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I have always preferred CBU over drywall. I've seen the effects of water leakage on the back of drywall where CBU would have stood up.
That being said, I have been using more and more Wedi over the last year or so and like it as well.
 

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I don't have any problem believing that drywall should be OK, but it just feels wrong. I do condo work where due to fire rating the drywall is going to stay, but I still put on 1/4" Hardi.
 

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We have recently started using Fiberock on shower walls due to the fact that it is the same thickness as drywall, where 1/2" Hardibacker is not. The Fiberock is easier to cut than hardi as well. Still makes dust, but not near as bad as Hardi. Once it's hung, we red guard everything and tile it.
 

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DensArmor is drywall with no paper content 4x8 sheets. DenShield is tile backer 3x5 sheets. Personally not a fan of either, and haven't seen any at local suppliers for years.
 

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That's what we do. Haven't ever put Sheetrock behind tile. Boss would probably try to slap some sense into me (literally) if I suggested it. Not that I would, because I'm just as passionate about the quality of work we do as the boss is.
 

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If my PO asks,I set tile
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Im with Angus. I use Permabase but with Hydroban.
Easy to work with and priced right.
 

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Schleuter insists that standard drywall is sufficient. I have done green board and it worked fine. Heck I did showers directly on too of green board years ago before I knew any better (showers in my dads rentals) and they are still standing. That said I have since honed my craft and I am particular to cement board. As mentioned earlier drywall with disintegrate in the instance of a plumbing leak whereas cement boar will survive. Also hardibacker is great for floors but wicks water so I would never use it in a shower.
 
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