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Unread 02-19-2010, 07:47 AM   #1
Jody216
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Problem with kerdi adhering.

Ok so I buy John's kerdi book call Schluter ask them what type of unmod thinset to use and they tell me mega bond so I mix it up put the kerdi up on the walls around a deck tub surround forget about it for a few days go back today and the edges of the kerdi arent sticking. I pull on the edges and the kerdi comes off with what I would call minimal pulling to me it feels like it anyhow. When I put the kerdi up I made sure I put thinset about 2 inches past where the kerdi was going to on the wall because i wanted to make sure Kerdi stuck. This is my first kerdi shower and bath. Now I'm afraid to tile over it for fear tile will just pull the kerdi down over time. Should I pull the kerdi down and start again? Can I clean the thinset off the kerfdi I used and use it again if thats what you suggest this junk ain't cheap. or should I just try to pull the kerdi back and thinset just where it is coming off at the edges. I bought and used the kerdi 1/8x 1/8 notch trowel and thats what I used to apply thinset. Any help would be appreciated.
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Unread 02-19-2010, 09:42 AM   #2
Muddman
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It does take a few days for unmodified to cure hard, but if it has been a few days since you put up the kerdi then you may have a problem. How about a few more details.
1.are you putting the kerdi over drywall?
2.how thick was the mortar you used on the kerdi
3.pictures of were you pealed up the kerdi
4.test the mortar you used. mix up a little ball to play-doh consistency, then wrap it in plastic and leave it for at least a day to see if it hardens up.

Three things come to mind right now. First, maybe the mortar hasn't cured yet. Kardi will actually peal off untill the mortar sets really hard. Second the mortar dried out too soon. This can happen if you go over hardi backer with dryer mortar, or if you just squeezed out too much mortar when you did the kerdi.
Third, and probably least likely, you got bad mortar.
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Unread 02-19-2010, 10:19 AM   #3
johnfrwhipple
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Kerdi not sticking - Why?

Is the Kerdi pulling away from where it is set to plywood?

Unmodified thinset is not the right choice to stick to plywood. Did you cover your framing with CBU?
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Unread 02-19-2010, 12:02 PM   #4
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Hi Jody,

It's possible you squeezed all the thin set out from behind the Kerdi at the edges. I've done it. The other thing is not having the thin set loose enough and allowing it to "skin over" before applying the membrane.
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Unread 02-19-2010, 04:50 PM   #5
ceramictec
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Quote:
Originally Posted by Whipple
Is the Kerdi pulling away from where it is set to plywood
plywood ? where ?


I like using MegaBond with Kerdi, it' drys nice. I also suspect you might have flat trowel and pushed out too much thinset at the overlaps.

I like to let my thinset come out the over lap, then flat trowel most of it off and then hit it with a sponge the opposite way so the thinset holds the edge down and drys nice.
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Unread 02-19-2010, 05:46 PM   #6
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Try using one of these to smoosh the kerdi to the thinset. This way you can't squeeze out all the thinset.
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Unread 02-19-2010, 06:42 PM   #7
Jody216
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Ok guys here are some pics.
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Unread 02-19-2010, 06:48 PM   #8
Brian in San Diego
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Jody,

That kerdi is not imbedded properly. It looks like maybe the thinset was too stiff or you applied it and let it skim over before the kerdi was put over it. Or it's possible you didn't apply enough force to get it into the thinset. Even with the thinset not quite loose enough if enough force is applied then you wouldn't see the ridges that are so prevalent in your photos.

Plywood is not an approved substrate for kerdi. I know JB does it but Schluter frowns on it.

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Unread 02-19-2010, 06:49 PM   #9
Jody216
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Answers to some of the questions the kerdi was applied to drywall and the deck was hardibacker but walls are drywall I mixed the thinset to the consistency of probably between peanut butter and soft ice cream. it was not put on plywood not sure where that came from. I flat troweled it afterI stuck it to the wall not sure if I did it too much or not maybe.

Now my question is by what you see should I pull it completely off the wall and start again. and try to clean the kerdi off? or should I leave what is stuck on the wall peal back and try to thinset it again? Thanks guys sorry about the pics are not the best they are from an iPhone
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Unread 02-19-2010, 06:57 PM   #10
Jody216
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Brian,

Thanks, maybe I didnt mix it loose enough maybe it was too thick. Ill scrape it off and try again with not as thick thinset. Think I can use the kerdi again?
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Unread 02-19-2010, 07:02 PM   #11
TileArt1
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Hey Jody,

If the Kerdi comes off the wall intact (like in your photo) you can use it again. If it pulls the fleece off any part of it while you are removing it I would not use it again.

Try the consistency of a milkshake - works for me.
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Unread 02-19-2010, 07:07 PM   #12
Jody216
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Roger,

Thanks will do. No a question just popped up in my mind when you said the fleece is there a side that is supposed to go againsed the wall and a side that is supposed to go against the tile? does it matter? Because the side that is against the wall is the side that doesnt seem to be fleece the fleece side seems like it is the side that would be against the tile. should I flip it?
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Unread 02-19-2010, 07:11 PM   #13
jgleason
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Both sides are the same so no worries there. Definitely looks like the thinset was a bit too stiff and skinned over before you got the Kerdi smooshed into it. Smaller sections, work faster, mix thinset like a McDonalds Milkshake and you should be all right.
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Unread 02-19-2010, 07:33 PM   #14
Jim wood
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I sometimes use a damp sponge on drywall and Hardi, it both cleans off any dust and puts a little moisture in the wall.
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Unread 02-19-2010, 07:44 PM   #15
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Jim - Exactly right, you should always use a damp sponge on your substrate just prior to installing Kerdi. This is often overlooked but is a must do!
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