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Unread 07-13-2010, 08:00 PM   #16
fn_benthayer
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Looks much faster and crisper than my typical kerdi over drywall niche.
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Unread 07-13-2010, 08:03 PM   #17
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That was the motivation behind the idea
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Unread 07-14-2010, 08:44 AM   #18
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Paul, what did you insert for support inside the wall after you cut out your square (and how)? And, if I wanted a shelf inside that niche, would you have just cut one out of Kerdi-board and Kerdi-fixed it in place? Would that be enough to hold tile or would you have used some other method?
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Unread 07-14-2010, 01:43 PM   #19
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Paul,

Looks good.

When you layout your initial cuts, you can make the legs longer at the top and bottom by the board thickness. In this case 3/8". You need to extend the head and bottom cuts 3/8".

This will give you a solid corner rather than the one shown.

I have yet to see Kerdi board in GA.
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Unread 07-14-2010, 01:46 PM   #20
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Observation

The problem here (or maybe it's not a problem) is that your niche won't be completely waterproof. I tested 1/2 in. Kerdi-board and Kerdi-fix making overlap butt joints, which are better than the joints you made. I made a small box, allowed it to set overnight and filled it with water. Took less than half an hour before I had water leaking out of it. I think it seeped through the fleece.

That is precisely one of the reasons that Schluter STILL specifies that joints in wet areas be waterproofed with Kerdi-band.

Now I said it might not be a problem, but only if the niche does not receive a good flow of water. For sure, though, your method won't meet warranty, and my people will not be contacting your people about including it in the book.
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Unread 07-14-2010, 03:06 PM   #21
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wow this was shot down fast.

so Paul *might have a leaky niche in the install he's doing because the fleece will still let water pass ?

looks like a fast way, how about if you Kerdi fix all the corners ?
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Unread 07-14-2010, 04:54 PM   #22
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I've got a feeling that with the thicker boards you might be able to render the installation waterproof with Kerdi-fix (or equivalent) alone. You can't do it with half-inch on down, though. I know it first hand.


Here is a picture of my box with water in it. You'll note that the joints are overlapped. On top of that I did a complete secondary bead inside the box. I know there were no pin holes. It leaked from several points.

The test and its result WILL be a part of the book.
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Unread 07-14-2010, 05:12 PM   #23
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Thanks for the update John. I did kerdi fix the inside joints of the jambs on top as well as on the back side of the kerdi. Since this is a niche, I don't think it will be a problem, but I will alter my method.

Some sample kerdi board to experiment with would be nice

Chuck, excellent point. I'll add that to the arsenal.
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Unread 07-14-2010, 05:39 PM   #24
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So you still need the kerdi band and 2" overlaps and corners when building a niche with kerdi-board?
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Unread 07-14-2010, 06:09 PM   #25
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John, did that box you built leak because the water had pressure? A niche would never have that much water pressure applied - just run off. Do you think that would still matter?
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Unread 07-14-2010, 06:39 PM   #26
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While cooking dinner I gave this more thought. I don't see how the thickness of the foam makes one little bit of difference if the water is getting through the fleece. I have a few things to experiment with to make sure.
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Unread 07-14-2010, 07:00 PM   #27
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Startin to make me re-think my old stand by . . .



Tried Kerdi-board and don't find it as user friendly as the Wedi. I use Wedi on all tub surrounds, but still do only Kerdi-showers, however the extra work on the K-board to cover the tab washers makes it pretty patchwork looking, time consuming and costly for the Kerdi-band. Watching the posts to see someone who really likes the K-board to find the real efficiency tips.
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Unread 07-14-2010, 08:22 PM   #28
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I'll start by duplicating JB's experience with the 3/8". Can't hurt.
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Unread 07-14-2010, 08:25 PM   #29
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No offense, but if the water seeped through the fleece, then, doesn't Schluter have a problem? I mean, the fleece is supposed to be the equivalent of Kerdi -- waterproof. How would the thickness of the board impact that? It shouldn't make a difference. I was really considering using it for a niche because the cost of a board is just about the cost of a prefab niche.
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Unread 07-14-2010, 08:32 PM   #30
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I was thinking the same thing Kim, The only thing I have come up with so far is the fleece when properly installed with thinset, is impregnated with cement crystals. That may keep the water from getting through the fleece.

That said, I don't think the fleece is thick enough on the K-board to allow more than droplets through at any time as the holes would be so small. The surface tension of water molecules should hold it within the fleece.



Still thinking
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