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Unread 05-12-2016, 06:44 PM   #1
scoutx
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versabond lft under and over kerdi membrane?

Bought the pdfs, been lurking for a long time working up to this project. Thanks to you all for the advice and participation even for lurkers like me.

I looked and looked for unmodified, but only found some really cheap stuff at Lowes. I ended up buying versabond lft from HomeDepot. I know the unmodified/modified Kerdi warranty conversation.

My question is, will this stick the kerdi membrane to the wall? Is it similarly ok to use over the kerdi? 12x24 Marble (I know.. marble in a shower)

Ok one more question - Painted drywall celiing, planning to tile it. Can I just sand it down a bit, throw some extra screws in and kerdi over it? I'm worried about the thinset to drywall bond.

Thanks again!
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Unread 05-12-2016, 09:07 PM   #2
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Hey Jeff ...WELCOME !!

If your not concerned about being by the book
The versa bond will work just fine. Like many pros here I've used miles of it and never had an issue with Kerdi or Ditra.
If you are concerned about the warranty then use a rapid set modified thinset mortar( another very acceptable and available at big box stores .. Also meets schluters warranty criteria ) or a quality unmodified .
Personally I wouldn't think twice about what you already have in mind
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Unread 05-12-2016, 09:32 PM   #3
jadnashua
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The sand size in the LFT formula might be an issue...the older stuff worked, but the formulation changed.

FWIW, thinset does not stick to Kerdi...it needs to flow around the fibers, then, once it cures, locks it in place sort of like liquid wax on your clothes...gets in between the fibers, but would peel off if not. Kerdi gets its waterproof seam by the close fiber layers from the two sheets...sand size might be an issue. The thinset does bond with the tile, but not to the actual Kerdi sheet, only locking around the fibers.
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Unread 05-13-2016, 12:20 PM   #4
scoutx
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Thank you both.

Any thoughts on the ceiling?
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Unread 05-14-2016, 12:28 AM   #5
dhagin
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Quote:
Originally Posted by Jeff
Can I just sand it down a bit, throw some extra screws in and kerdi over it?
Yes, probably. What is the ceiling joist/truss spacing? What thickness drywall? If 1/2", is it ceiling board?

If these check out, then yes, rough up the paint and Kerdi it like everything else. No worries on tiling ceilings once we verify structure.
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Unread 05-14-2016, 08:09 AM   #6
koihito
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I know a guy who can confirm that Versa Bond LFT under kerdi can pass a pan test. In fact, due to schedule issues it held water for 5 days before the inspector got there. Though given a choice he would prefer the non LFT Versa Bond.
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Unread 05-14-2016, 11:16 AM   #7
scoutx
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Thanks both.

16" on center span- 2x6's. ~10 year old construction. Grout failed and it was just thinset over greenboard- I can't believe people still build like this.

Yes, 1/2 drywall (glued and screwed if its like the walls).

Pan is poured (mud pan kerdi drain), I went with durock walls (couldn't bring myself to just drywall) even though I've read enough to know better. I will wet it down thoroughly.

Can't thank you all enough - this board and books saved me from just putting in a fiberglass neoangle I knew I would regret every day.

And thanks for the versabond lft opinion.

Thank you - I'll let you know how it goes.
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Unread 05-14-2016, 03:08 PM   #8
dhagin
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Ceiling should be fine. Add screws, rough up paint, Kerdi, tile.
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Unread 05-14-2016, 03:12 PM   #9
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Unless you're planning a steam shower or your ceiling is particularly low, I wouldn't bother with Kerdi up there at all. Just prep the ceiling and tile.

My opinion; worth price charged.
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Unread 05-15-2016, 05:39 PM   #10
scoutx
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Thank you. I am sort of planning a poor man's steam shower. I have a shower panel with misters that will simulate it if I have glass up to ceiling (transom over the door), exhaust fan in shower etc.

I have room and access (water/220) if I ever want add it.


Thanks again - all.
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