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Unread 04-25-2007, 11:09 AM   #1
holybuzz
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Kerdi to tub flange

Hello!

Keith here. Longtime lurker, first-time poster. This forum is indispensable.

I know that people have wrestled with this problem before, but I haven't seen a definitive answer or anything like a consensus.

Here's my problem:

I'm using Kerdi in a tub/shower installation. I installed cbu (I was initially going to do a 6 mil poly on a 1/2' cbu install and had already bought and cut the cbu). The 1/2' cbu comes down to within an 1/16th to an 1/8th of the tub deck. The cbu rests on the tub's thin flange, which I had notched into the studs. Despite the notching, the cbu still bulges out just a little on the flange, but I'm hoping that a little feathering of the mortar will more than take care of this. BTW, I'm using a 3x6 subway tile.

The big question:

What do I do with the Kerdi where it meets the tub? Do I cut it a little long and tuck it into the space between the bottom of the cbu and the tub top? If so, what should I use to affix it to the flange? The shop that sold me the Kerdi called Schluter to ask if Kerdi-fix was the way to go. They said that smoothing the Kerdi down will push some mortar into the seam, enough to seal it up. Once it's dried, they say, then caulk it well and go to sleep.

Is this right? My worry is that vapor will finds its way through that seam and come into contact with the cold kneewall behind. The result: condensation.

Any suggestions on the right caulk? White or clear? Etc? Any other tips?

Thanks in advance.

Keith
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Unread 04-25-2007, 05:24 PM   #2
Davy
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Hi Keith, welcome. I think I'd tuck it back in there and apply a bead of silicone (clear or white) over it. Are the tiles going to reach over the tub lip okay?
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Unread 04-25-2007, 06:07 PM   #3
holybuzz
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Tiles over flange

Davy,

Thanks for the tip.

There are a few "tile to tub flange" diagrams floating around this forum, and my plan seems to conform to them.

I plan to run the Kerdi past the bottom of the cbu, tuck it under the cbu and toward the flange, then tile down past the bottom of the cbu, enough to cover the cbus and the Kerdi, but with a gap that will allow some space to caulk/silicone.

Does that sound about right?

What I was hoping for was a specific tip as to how to affix the Kerdi to the flange. I envisioned poking some mortar in there using some tool.

Or do most people just poke it in there and let the caulk do the rest?

K
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Unread 04-25-2007, 06:51 PM   #4
muskymike
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Hi K, yeah let the caulk do the rest. Caulk the Kerdi to the flange.
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Unread 04-25-2007, 08:24 PM   #5
holybuzz
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Thanks

As usual, the forum came through for me.

Thanks.

K
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Unread 04-26-2007, 09:40 PM   #6
sandbagger
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schluter also makes a molding thing for that. Dilex I think it's called.
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Unread 05-02-2007, 12:52 PM   #7
holybuzz
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Shower niche/narrow studs

Hello,

I want to install a shower niche. Unfortunately, the pair of studs where the niche "must go" are about 13.5" apart from their inside edges (old house, fudged construction). Since most of the prefab niches require a 14.25" opening and I don't feel like notching the studs that much, does anybody have any suggestions? The only niche I've looked at was a coated metal niche by Recess-it. It can't be modifed. Are there other brands that can be cut/sanded?

If not, what's the best way to (ulp!) make a niche?

Keith
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Unread 05-02-2007, 01:26 PM   #8
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see www.noblecompany.com we have a couple narrow ones (8.25")
Our 14 1/4" could have 1/2" trimed from each side to fit however.As I was typing this I got a phone call from Keith so........never mind.
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Unread 05-02-2007, 01:45 PM   #9
holybuzz
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Extreme Customer Service!

Can you believe this?

While I was waiting for an answer to my original post (see above), I decided to call Noble (www.noblecompany.com) to ask if their niches could be modified (cut) to fit between a narrow set of studs. When Eric at Noble picked up, he was AT THAT VERY INSTANT conferencing with Noble's engineers about my question.

How's that for customer service?

Thanks, Eric.

BTW, you can deliver the pizza and drop off my laundry to the same address that you ship the niche.

Keith
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Unread 05-02-2007, 01:53 PM   #10
ddmoit
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I am genuinely impressed, but not too surprised.

As a customer, this kind of thing tells me more than any brochure ever did. I'm sure it's just another day for Eric. The only difference for us is that we know about it today.
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Unread 05-02-2007, 02:40 PM   #11
e3
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Just picked up a nice order for 1100 Showers (chloraloy and slopes) to go with the Niche from Keith.. Might warrant a cigar tonight.Or better yet maybe I'll go fishing!! (its been 3 days since I was out last) Thanks Keith!!!
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Unread 05-02-2007, 04:16 PM   #12
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Eric, that is indeed a nice order. You should go fishing for the rest of the year.

I only want to mention (after the fact), that framing can always be modified by installing a "header" over the niche area, installing "cripples," and cutting an offending stud out of the way. I do it frequently when centering a niche. I'm putting this here for folks who come along later. Don't want to cut Eric out of Keith's purchase.
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Unread 05-02-2007, 06:58 PM   #13
holybuzz
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Good point

Point taken, John.

The problem in my case is that the niche is right at the highest point of a knee wall that encroaches on the shower at about five feet. If I put the niche any higher, the "Gee Your Hair Smells Terrific" will never stay in place.

Keith
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Unread 05-02-2007, 07:02 PM   #14
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