Question about using a ledger board on a kerdi shower [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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02-19-2010, 10:07 AM
Hey guys great forum,
This is the first time I did a kerdi shower(used ditra a bunch)and it's easy to install and seems like great stuff.

My question is; I normally start tiling the second row and us a ledger board to support the tiles. How do I go about fastening the board to the walls that have the kerdi there? I don't want to pierce the membrane with a nail or screw; although I do have a tube of kerdi fix. Is this an acceptable method to seal the holes in the kerdi?

Also, I'm installing a pattern on a 45% angle in the middle of the main shower wall. I would normally start from the middle tile in the 45% pattern and use thin little nails to support all the tiles in the 45% angle pattern. What can I do since this wall will also have kerdi on it?

Here is a pic of the last bathroom I did that shows what I'm talking about when I say, "installing a pattern on a 45% angle in the middle of the main shower wall."

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02-19-2010, 10:30 AM
Some guys do use screws and them patch the holes with a little patch of kerdi and mortar.

what I like to do is hold up my board with a couple 2x4;s and shims, and then use some double sided sticky foam tape to get the board to stay on the wall, but the boards still support it. Then it just peals off when done.

Brad Denny
02-19-2010, 10:42 AM
Welcome Jesse,
Be sure to drop by the Pro's Hangout, iffn' you're a pro, and give us an introduction. Also, follow the link below my sig to go to your User CP and put us a signature so we know who you are.

The Fix oughta fix it for the ledger board. For the diagonals, you can work your shims off the two adjacent walls to "support" the ones above your first row. I usually let the first row slide around a little till I get things firmed up, and the next go up easily.

02-19-2010, 11:37 AM
i had the same problem just recently. i solved it by taking the ledger board and attaching (screwing) a 2x4 vertically near each end to the ledger. i then shimmed under 2x4 to get it to the right height. i then took one more 2x4 and laid it on the floor in front of the vertical 2x4s to act as a brace and screwed those together. it was easy to make this "jig" and it worked very well. it was easy to remove it and then reposition it on the next wall.

John Bridge
02-19-2010, 11:59 AM
If you have kerdi-fix, a little dab will fill a screw hole. Silicone caulk will do it, too. With larger tiles the screw holes are way up above the curb. There'll never be any water pressure there.

For smaller tiles I would use the shimming method the others have described.


02-19-2010, 03:09 PM
Thanks for all the quick responses guys.

I'm still a little weary about trying to set these tiles on a 45% angle without the little nails. Even with the nails stuff moves the slightest bit. I can't imagine trying to get everything perfect while tiles are slippin n slidin while dryin.

Any other ideas for supporting the tiles on a 45%?

Houston Remodeler
02-19-2010, 05:37 PM
Blue painters tape. It will hold the tiles together quite well. You can put the tape in any direction you want. Don't be stingy with it. I like to make little folded flaps at one end to make it easier to peel off.

Using LASH available from home depot, or Tuscan leveling system, will also help hold the tiles together as in the picture below

02-22-2010, 01:48 PM
Thanks for the responses and advice. Wasn't sure how well the blue tape would hold on the kerdi but it worked great.

Today I started tiling the diagonal tiles and ended up using lots and lots of good ol' blue tape to hold everything in place. It's what I normally would do but I would also use a few thin nails where I really needed support. But not this time; just lots a blue tape and a piece of hard foam wedged under the bottom diagonal tile and the floor.

I tried using the LASH for starting the diagonal in the middle of the wall and wasn't crazy about them for this application. When it isn't under pressure the clear clip that goes under the tile is thicker than the thinset behind the tile so it kept popping the tiles off the wall. But I was by myself and think another set of hands would've made these work great for this application. I definitely plan on using them on the marble floor for no lippage. They are pricey so I will use them since I opened the bags already. They should work great on the floor though.

02-22-2010, 02:59 PM
CabotAndRowe I just checked out yer website and saw you're from Bucks County PA. That is where I live unfortunately. I'm from California and its too cold up here; I'm thinking of moving back. Thanks for the advice.

Houston Remodeler
02-22-2010, 05:09 PM
I enjoyed living in Bucks County until it snowed 3 feet in one day.

02-22-2010, 05:13 PM
i used to work in bucks county (yardley). i grew up in NE philly. i have moved up to northern NJ but my folks still live in the area (bensalem, right near the race track / casino)