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Old 04-18-2007, 02:59 PM   #1
tilenovice
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Bathroom Renovation

I am renovating my bathroom which contains a tub surround. I installed the whirlpool tub with tile flange. I was hesitant about using Kerdi so I bought Durock for the walls (not installed yet) but now have decided to use Kerdi because it seems to make more sense to keep the water out of the walls. I am now reading about problems with modified/unmodified thinset and also problems with CBUs instead of drywall.

What should be my game plan using Durock and Kerdi:
1. The seams do not need alkali tape because the Kerdi takes care of that correct?
3. Wet Durock with a sponge prior to thinsetting.
2. Unmodified or slightly modified thinset (Versabond) on Durock then Kerdi?
3. Unmodified or slightly modified thinset (Versabond) on Kerdi then tile?

Does anyone not recommend installing over Durock? Should I take the Durock back and just use drywall? I like the Durock just in case some water would infiltrate somehow. I know it is a little more difficult using Durock so that is not a big deal. Just do not want to have a bonding problem of Kerdi to Durock.

Just the start of my questions.

Thanks,

Tim
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Old 04-18-2007, 03:16 PM   #2
irish tileguy in michigan
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use drywall or cbu if u have it , but if your useing cbu because your afraid water will get through the kerdi then your wasteing your money on the kerdi. kerdi if installed properly is water tight.
schluter says to use unmodified under and over the kerdi but alot of contractors here use versabond , its slightly modified.
if using cbu damp it down with a sponge first.
dry wall is perfectly accecptable under kerdi and cheaper and easier installed.

good luck Tim.
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Old 04-18-2007, 07:49 PM   #3
tilenovice
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Thanks Steve.

I understand but I can not get over the fact of installing drywall in a wet area even if it is covered. Doesn't seem right? I need to make a decision by Saturday. I may just go with the Durock since it is already in the garage.

Anyone ever have problems with Durock and Kerdi together. Recommendation of unmodified or Versabond with Durock. I do not want to create any problems.

Tim
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Old 04-18-2007, 09:40 PM   #4
irish tileguy in michigan
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Tim,
im doing a shower currently with kerdi over durock ( customer had the durock already) , am using unmodified thinset ("Tec" sturdi set)----no problems.
do what makes u feel more at ease.
good luck.
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Old 04-27-2007, 06:12 AM   #5
tilenovice
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Next question that I just thought of. I am doing a tub surround with Kerdi over Durock. (I know I do not need Durock but bought it before I decided to go with Kerdi and I do not have a vapor barrier behind the Durock.) I think I will use the Ditra-set thinset under the Kerdi.

Should I also use the Ditra-set thinset for the tile over the Kerdi.

Also, the tile in my bathroom will be continuous out from the tub area. I guess I have to change thinset when I start tiling off the Kerdi onto the drywall. Since I am using a porcelain tile, this thinset should be modified, correct? Would VersBond be acceptable or should I use something more modified.

Thanks,

Tim
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Old 04-27-2007, 08:29 AM   #6
Brian in San Diego
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Tim,

First of all, you should have No Fear of the kerdi membrane. It's a tried and tested material that has been used to waterproof showers all over the world. If it's not too much trouble to exchange the durock for drywall, I for one, would suggest that you do that. The drywall is easier to install and I think provides a better surface on which to apply the kerdi.

You said...
Quote:
I think I will use the Ditra-set thinset under the Kerdi.
Did you mean kerdi-set? The kerdi-set is the material designed and developed for the kerdi membrane.

The versabond is a good choice for setting porcelain tile directly to the drywall outside the shower. Don't forget to sand/rough up any paint on the drywall.

Brian
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Old 04-27-2007, 10:21 AM   #7
tilenovice
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Brian,

The Durock is already up so Durock it is.

I wanted to use Kerdi-Set but I was informed by this website on Wednesday that Kerdi-set is not available yet. The Ditra-Set says to use with both Ditra and Kerdi.

From the Bostik website:

Kerdi-Set Non Sanded Mortar

KERDI-SET™ Non Sanded Mortar is composed of select, proprietary chemicals, ultra fine aggregates, inorganic adhesion promoters, and purified cements. It provides outstanding workability, excellent durability, and superior bond strengths in interior and exterior applications when used in conjunction with the Schluter®-KERDI waterproofing membrane. Use KERDI-SET™ to install the membrane over substrates approved by Schluter® Systems and to set ceramic, porcelain, and stone tile over Schluter®-KERDI.

• Excellent vertical grab “non-sag” mortar
• Excellent for wall tile in showers, tubs & fountains
• Excellent for use as a pure coat when setting tile or stone with mortar bed methods
• Excellent for setting ceramic fixtures and decorative trims
• Excellent for Paper Faced mosaics


Ditra-Set™
For Use with Schluter®-DITRA and Schluter-KERDI Systems

Hydroment Ditra-Set™ Thin Set Mortar is composed of select, proprietary chemicals, carefully graded aggregates, inorganic adhesion promoters and purified cements. It provides outstanding workability, excellent durability, and superior bond strengths in interior and exterior applications when used in conjunction with the Schluter®-DITRA uncoupling membrane and Schluter-KERDI waterproofing membrane. Use Ditra-Set to install the membranes over substrates approved by Schluter Systems and to set ceramic, porcelain, and stone tile over Schluter-DITRA and Schluter-KERDI.

Thanks,

Tim
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Old 04-27-2007, 11:09 AM   #8
Brian in San Diego
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Tim,

Go for it! I didn't realize the kerdi set wasn't available yet. Bostik's website doesn't seem to have a retail locator like the TEC and Laticrete websites and Bostik doesn't say "coming soon" over the kerdi-set bag.

Brian
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Old 05-14-2007, 11:52 AM   #9
tilenovice
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Kerdi to Drywall

Put up some Kerdi late Sunday using Ditra-Set and seemed pretty simple. The kerdi-band in the corner was like taping a drywall corner with compound. I will check for any air bubbles tonight. Anyway a couple of questions:

1. How long does it take the thinset under Kerdi to dry and fully stick to the wall. I read many posts stated don't play with the Kerdi because you can pull it off for a while after installing. I did not play with it much yesterday just to check for coverage a couple of times.

2. I am doing a tub surround and will continue the tile past the Kerdi on a continuous wall. I guess at some point I need to change thinset when I transition from Kerdi to drywall. On top of the Kerdi I planned on using Ditra-set for the tile. Can I continue using Ditra-set on drywall or change to something modified like Versabond. I am using porcelain 6x6 tiles. Or should I just use Versabond over Kerdi and drywall so no thinset transition will be required? I know Schulter states unmodified over Kerdi.

Thanks,

Tim
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Old 05-14-2007, 12:49 PM   #10
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Ditra-Set can be used over drywall as well with no problems Tim. That stuff has an amazing bond and given the testing I have done, it's much stronger that VersaBond.

Having used Ditra-Set, by day two that Kerdi will be well stuck. However be advised you'll still be able to pull it up, even after 30 days. All these various membrane products like Kerdi and Ditra can be peeled up, even when set using the strongest thin set mortars known to mankind. It's just how they work. No cause for alarm or worry though. Once cover with tile the shear bond is more than adequate to hold everything in place and no one is going to be trying to peel it off the wall.
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Old 05-14-2007, 01:07 PM   #11
tilenovice
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Thanks for the quick response.

So no additive is required for the Ditra-set over drywall just mix with water. So I can just continue using the same Ditra-set with water for tile over Kerdi and also tile over Drywall.

Thanks,

Tim
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Old 05-14-2007, 01:09 PM   #12
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Nope, no additive required whatsoever, just water.

Quote:
So I can just continue using the same Ditra-set with water for tile over Kerdi and also tile over Drywall.
Yep, you sure can.
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