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Kerdi [~Band] over Hardie Backer joints

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iconoclasthero

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Discussion starter · #1 ·
I have a partial roll of Kerdi membrane and some unmodified thinset left over from another project...quite enough of it that I could cut some strips of the membrane to use as an approximation of Kerdi band and then use that instead of a new roll of alkali-resistant tape. I have 7/8ths of a gallon of Red Guard which will be the surface waterproofing layer. I saw this thread: https://www.contractortalk.com/threads/kerdi-band-on-durock.85111/ and I'm not sure that the OP was asking the same thing, namely:

tl;dr:
Would there be any disadvantage in using left-over Kerdi membrane cut into strips and unmodified thinset—items already on hand and in substitution for the A-R mesh tape so less expensive overall—to patch the Hardie joints?
 
#2 ·
I’ve never, nor would I ever mix kurdi and red guard together!

they haven’t made on modified thin set from Laticrete for a while. It’s now called all set.
 
#4 ·
I did a hybrid shower once where i used a schluter base and cement board walls. I used red guard on the walls and ran it down over the Kerdi band where it turned up the walls about 2 inches
 
#6 ·
iconoclasthero said:
I have a partial roll of Kerdi membrane and some unmodified thinset left over from another project...quite enough of it that I could cut some strips of the membrane to use as an approximation of Kerdi band and then use that instead of a new roll of alkali-resistant tape. I have 7/8ths of a gallon of Red Guard which will be the surface waterproofing layer. I saw this thread: https://www.contractortalk.com/threads/kerdi-band-on-durock.85111/ and I'm not sure that the OP was asking the same thing, namely:

tl;dr:
Would there be any disadvantage in using left-over Kerdi membrane cut into strips and unmodified thinset—items already on hand and in substitution for the A-R mesh tape so less expensive overall—to patch the Hardie joints?
Click to expand...
The tape is like 10 bucks just buy it
 
Discussion starter · #7 ·
Thanks all... I'm more interested in whether there is a theoretical problem with the setup. There's a lot of time in this job spent doing think-from-the-neck-down work and one's mind gets to wandering—and if it wasn't for the problem solving aspects of this job I sure as **** wouldn't be doing it.

thanks @nickko and @MarkJames; answered the question and the point about the thicker joints seals it for me (no pun intended!).

@andyoraz, @avenge: Since a primary objection in the linked discussion was cost, I was simply showing that calculation was reversed in this situation and thus cost as a concern is moot, not that I was trying to "pinch pennies," but thanks for you both for your two pennies.
 
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iconoclasthero
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