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Old 01-15-2012, 07:15 AM   #1
tulse
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Kerdi over Kerdi Tray before or after tiling walls?

On small 32"X36" shower floor...

I'm concerned about working and walking on a Kerdi covered Kerdi tray. I feel I'd be trampling the fabric and mortar if I tiled after I Kerdi'ed the floor (in such a small area). So, out of the two options, which is easier or "better":

1. Kerdi the whole shower, then protect the floor while tiling (I have some pink foam board insulation I can use).

2. Kerdi the walls only. Use a ledger board and tile the walls first, leaving the last row of tile out, then Kerdi the floor. Install tile over floor, the install last row of tiles.

I will be doing a vertical running bond of 12"x24" tiles.

Thanks!
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Old 01-15-2012, 07:17 AM   #2
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Sam,

Lots of Pro's leave the floor till last, especially those of us who have gravity where we work.
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Old 01-15-2012, 07:30 AM   #3
tulse
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Gravity is hell here. I kind of messed up the first post. I will be installing the floor tile last either way.

I was just anxious to get the water test done before tiling the walls, but I think I'll take the leap of faith and wait to put the Kerdi on the floor until the wall tiles are done.

So, it's not advisable to go sashaying all over the Kerdi membrane on the floor I take it.

Thanks.
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Old 01-15-2012, 07:45 AM   #4
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I would kerdi both the wall and the floor at the time you are doing kerdi and
then protect the kerdi & tray with a drop cloth, cardboard, etc.
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Old 01-15-2012, 09:07 AM   #5
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Protect the kerdi as though it were a finished hardwood floor. Vacuum it well, then add a slip sheet of paper before topping it off with drywall, old carpet scraps, layers of cardboard or what ever is handy that will bend with the shower floor curves.
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Old 01-15-2012, 11:40 AM   #6
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i'm in the process of doing what your're doing now...here's some advice for what it's worth, from a diy guy

1. do the floor last..or you'll have a mess
2. do not put up large sheets (as john does in his book...."going for the gold"
MUCH easier to put on smaller sheets and "lap them" (for a first timer)
3. round off the edges of your trowel..sooner later you'll poke a hole in the kerdi if you don't (or maybe it's just me)..i ignored that advise and wish that i hadn't

4. lash system works great...i modified a cheap "visegrip" type tool form harbor freight and have minimal "lipage"...search it on this forum....i reduced the "bend" in the tabs using a hot air gun....
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Old 01-16-2012, 07:27 AM   #7
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Thanks all.

I made the decision to only use half sheets right after I tried a whole. I was just testing fitting a whole (no thin-set down) when I decided to get the scissors out.

One more quick question:

Do you nail up ledger boards? Would screwing them up wrap the Kerdi up in the screw and pull it away from the wall?

Sorry for being so anal-retentive, but I only want to do this once.
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Old 01-16-2012, 07:44 AM   #8
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I've heard of no issues with driving screws through Kerdi that can't be addressed when you patch the holes later.
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Old 01-16-2012, 07:53 AM   #9
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Thanks.

I have Kerdi-fix. I just didn't want to end up with 50 bucks worth of Kerdi ripped of my wall and wrapped around a five cent screw.
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Old 01-16-2012, 01:47 PM   #10
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You could cut a sheet of ply the proper height and width and just prop it against the wall or wedge it there...no holes, nothing to repair.
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Old 01-17-2012, 09:09 AM   #11
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i used a ledger...screwed into the walls...use at least a 1x6 board...screw in toward the bottom of the board (hole will be easier to patch and get the two inch overlap)

kerdi -fix the hole an patch with kerdi...no leaks in mine...my tiles where heavy 18 x 18 inches
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Old 01-18-2012, 12:48 PM   #12
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Tulse's Bathroom Project

I read some back posts, but didn't see much in the way of anyone who has done it.

The concerns I've read are with point loading it. Of course, I read all this after the tray and drain have been installed, Kerdi'ed over, and after I bought the Pebbles.

Anyway, the Kerdi on the tray has set for 24 hours now. I used Ditra-Set. It's sturdy under my whole palm, but I can easily push a divot into it with my finger. That concerns me. Most say flat pebble should be fine, though. I'm sure it would be fine with larger tiles, but can anyone comment who has done a flat pebble shower floor over a Kerdi Tray on how it's holding up.
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Old 01-18-2012, 01:04 PM   #13
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BTW, Schluter tech says it's fine to use flat sawn as long as fully embedded in thin-set and cured.

Also, what size trowel should I use?

Thanks.
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Old 01-18-2012, 01:44 PM   #14
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Sam, smallest notch you can and still get full coverage. probably a 3/16" v-notch, maybe 1/4" square. never installed pebbles over foam. show us a pic eh? how big are they? PLEASE let us know if it ever fails.
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Old 01-18-2012, 01:59 PM   #15
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Sure, thanks.

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