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Old 03-11-2012, 11:52 AM   #1
tilingrookie
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Finningan's Funky Bathroom Remodel

Hello there. The Schluter folks said any urathane based sealant would be acceptable to use with Kerdi board.
Of course, they wouldn't suggest brand names.
I have such a small amount to use, aka in and around a kerdi-board niche, that I was hoping to find an alternative sealant that won't damage the Kerdi-board.
Anyone have any suggestions? I tried a search, but literally hundreds of results came back, essentially everything including the name "kerdi"
thanks
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Old 03-11-2012, 11:56 AM   #2
MarkTarkus
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I have had good results from Sika products sold at Home Depot. Sika Flex I think is what it's called. 6-7$ a tube. I still think kerdi fix is the best though if it's in the budget.
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Old 03-11-2012, 11:59 AM   #3
ceramictec
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anything that is a "Silyl-modified polymer"

look into the Bostik's 70-03A sealant.

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Old 03-11-2012, 02:46 PM   #4
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thanks - two good suggestions!
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Old 03-11-2012, 02:56 PM   #5
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You might find something locally that works too. MD, Tremco, Noble and others make polyurethane sealants as well. I've had good luck with Vulkem by Tremco, and it's readily available here. Comes in sanded and unsanded versions too. Noblesealant is a good one too.

If you find something else, post a link here and we can have a look.
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Old 03-11-2012, 06:57 PM   #6
vrusso123
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1 vote for the Sika-flex. good stuff.
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Old 03-11-2012, 06:58 PM   #7
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Dana -

I've wondered the same on sealant...
So tried and true products for me (NP1, 116 etc) are *equal* substitutes ?
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Old 03-11-2012, 07:06 PM   #8
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Sika Flex is a sure bet. There are several versions of it. I think any of them will work.
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Old 03-11-2012, 09:02 PM   #9
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Here is a product I have been using Urethane Caulk

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Old 03-11-2012, 09:05 PM   #10
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Here is a better link Urethane Caulk

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Old 03-11-2012, 09:09 PM   #11
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Here is another great sealant

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Old 03-11-2012, 09:36 PM   #12
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For those using K-Fix, how much outgassing does it have....

The stuff I'm familiar with are *exterior* grade use only but I think it's more due to it's outgassing properties...
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Old 03-11-2012, 09:54 PM   #13
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I use Wedi sealant. Cover Kerdi tabs like wedi, above primary splash lines. Kerdi band the lower sections. Course I cover the corners with Kerdiband.

BTW - I mocked up (4) 6"x 6" Wedi panels and butt seam sealed them with the Sikaflex 1A, and also the Wedi Sealant. The Sika 1A left a glossy surface, the Wedi Sealant had a flatter finish. 2 days later I couldn't pull the Wedi sealed ones apart with opposing pull, could pull the Sikaflex apart though. Still took a lot of tugging to do it though.

I remember that Wedi used to use Sikaflex as their sealant until they private labeled theirs. Dont know but wouldnt be surprised if it was mfgr'd by sikaflex still. My experience with the 1A sausage tubes that I bought just didnt perform as well as the Wedi, but it may have been a bad batch, or old . . . will have to check.

One interesting thing happened this week tho. I was using the Sikaflex 1A on a Wedi installation. Ran out, so I grabbed my next sausage which was a Wedi. Squirted it on just the same, but whereever the two wet goo met - turned to cottage cheese almost immediately. Really nasty looking messy stuff. So I'd say they arent the same mix based on the way they reacted when mixed.

I've got a few tubes of 1A left and am only going to use them for adhering board to studs and not on top. Wedi is readily avail here so thats my choice vs Kerdi-Fix Gold Edition.
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Old 03-12-2012, 07:33 AM   #14
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Don't know about the rest of the line for sure, but Sikaflex - 201 US will do it. You won't pull it apart once it cures.
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Old 03-12-2012, 10:43 AM   #15
tilingrookie
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there are two versions of Sika-flex at HD...'construction sealant' or 'self-leveling sealant'. 'Construction is $19, vs 'self-leveling', which is $8
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