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Old 01-15-2018, 06:45 AM   #1
Mdcdvm
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Mud shower pan

Installed a 4 x 6' mud pan for a kerdi shower following the amazing advice in
the resources here. Seems rock solid except in areas the top 1/4" is crumbling. Used a stiff brush and vacuum to remove the loose material. Can I skim coat over this with thinset to make smooth surface for the membrane installation?
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Old 01-15-2018, 04:03 PM   #2
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You'd fare better with a flashing compound as the maximum total depth of thinset is 1/4" including what holds the tiles down.
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Old 01-15-2018, 07:28 PM   #3
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Yep, what Paul said. Also, thinset is hard to work with for floating. Another option is to tear it out and start over. Deck mud is cheap.
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Old 01-15-2018, 09:43 PM   #4
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Thanks guys. The areas are fairly localized so I may give the flashing compound a try. I can always start over if it goes poorly.
1)Got a product you would consider?
2)Not quite sure how to waterproof the shower valve (kerdi shower) as it is a combination diverter and control valve in the same oblong/oval housing which obviously wont work with the supplied round kerdi mixing valve seal.
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Old 01-20-2018, 06:34 PM   #5
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Anyone still there?
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Old 01-20-2018, 06:44 PM   #6
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1- Ardex (Henry) feather finish

2- Got a pic?
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Old 01-26-2018, 02:19 PM   #7
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Image is sideways, sorry
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Old 01-26-2018, 02:41 PM   #8
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It might be easier to use KerdiFix to seal around it to the Kerdi membrane.
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Old 01-26-2018, 02:43 PM   #9
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and another
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Old 01-26-2018, 03:09 PM   #10
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So if I've got this straight, cut the kerdi membrane to the dimensions of the rough-in housing and then seal the membrane to the plastic housing with a bead of kerdi-fix? Will the kerdi-fix bond to the plastic housing?
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Old 01-26-2018, 06:08 PM   #11
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KerdiFix bonds to almost anything (you should read the spec sheet on their website)...suggest you might consider wearing some disposable gloves.
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Old 01-28-2018, 09:30 AM   #12
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Thanks Jim.
I will check the specs on the kerdi-fix, I assume mortar bonds to it?
Another hopefully small problem:
1) My curb does not intersect the walls at 90 degrees so the preformed inside and outside corners wont fit. More kerdi-fix? If so how should I go about it?
2) I noticed online an experienced tile guy screwing ledger boards thru the kerdi membrane, then filling the holes after with kerdi-fix. Is this routinely done and is it kosher?
Thanks much in advance. As I've said before, you guys rock.
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Old 01-28-2018, 02:16 PM   #13
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1. Long before Schluter made pre-formed corners, you had to fabricate your own. FWIW, they do make them in 45-degree (135) angles, if that helps. Take a square of Kerdi or Kerdiband, fold it into quarters. Crease it as much as you can, then cut from the middle edge to the center along one of the folds. Take those two flaps and make a corner. If it's not square, you can then cut a piece at the right angle to fill in the flat. If your corner is tight, it won't leak through that point, but you can use a dab of KerdiFix on it if you want. Kerdiband is thinner, but Kerdi works, too.
2. You can do this, or, depending on how wide your ledger is and where you put the screws, you can put a patch of Kerdi over it...As long as you get the minimum of 2" overlap, that works.


Yes, Thinset will stick to KerdiFix...you don't need it to be a thick glob...probably a minimum of 1/4" overlap or so spread thinly onto the membrane is more than enough. You might want to double-check the instructions...it's been awhile since I used some. The stuff sticks to wet surfaces as well and will cure. The instructor in class said he's used it to seal a leak in an above-ground pool liner, attaching a small patch with it without draining the pool. FWIW, it cures from the edges at about 1/8"/day.
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Old 01-28-2018, 09:22 PM   #14
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Got it. Made a guess on the outside corner. Pics show mock up of the inside, outside, and both together. Plan on using kerdi-fix on the seams/corner after application. (sorry for the rotation) Good to go?
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Old 01-28-2018, 09:49 PM   #15
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So while you have an inside corner and an outside corner very close to each other, I suggest first considering them separately. Then depending on the details you may be able to combine a piece for one with a piece for the other.

On the inside corner, the sum of the angles of the boundaries of the adjoining planes is less than 360. So you can cover the entire corner with one piece of membrane that overlaps itself. Your sample piece looks good.

On the outside corner, the sum of angles is greater than 360 degrees. Since you can only get 360 degrees out of a single piece of Kerdi, you'll need to use two pieces to cover the corner. The one piece you have made for the outside corner looks good; the corresponding piece should have its missing coverage directly opposite the piece you made.

Now, since the two corners are so close to each other, you probably can use one piece of Kerdi for the inside corner that also plays the role of the second piece for the outside corner.

In other words, make the vertical legs of the inside corner piece taller, and make a slit down to the top corner of the curb. One side of the slit continues up the wall, the other side of the slit folds down onto the curb. The portion of the outside corner this piece misses is now roughly opposite the missing area in your outside corner piece.

Hope that helps and is clear enough.

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