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Old 02-21-2010, 10:09 AM   #1
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Quick question

I have to put a kerdi drain in on a concrete job. Trouble is all that is there now a 2" pvc pipe sticking up 6 inches out of year old concrete slab.slab flat with no recess for the drain.

I figured I will need to chip/cut out the concrete around the pipe(that will be fun) but I noticed on some drain diagrams somewhere they showed a 4 inch piece of pvc pipe supporting the drain in cases like this..whats that all about? Is there any other purpose for the 4 inch?

Is there any reason why I cant just backfill the hole with mud..if not then why would you ever need to use a 4" inch pipe? Why have a diagram for it?

Scroll bout half way down...what it all mean? It this just for when using the tray? Mine will be mud

http://www.schluter.com/media/brochu...k-2009-Web.pdf
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Old 02-21-2010, 10:41 AM   #2
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Hi Jim, I have never used a 4". I just jack hammer round the drain and back fill with deck mud. Here's one I hadda move the drain some. I leave the drain up bout 3/4" ish to stuff mud under it. You can use a shim or a thin board.
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Old 02-21-2010, 11:05 AM   #3
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It must be something you do IF you use the tray? although I still don't see it needing it with that either? wonder why they say to do it that way...usually when a reputable company says to do something a certain way there is some reason behind it. Anybody know why?
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Old 02-21-2010, 11:11 AM   #4
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I agree.


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Old 02-21-2010, 11:51 AM   #5
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Jc thats so you got room to work. You never seen a drain in a slab and the concrete guys throw in some 2x4s and then you gotta knock em out and theres a big hole to fill with concrete will you gotta allow room for the kerdi drain so if you put 4" pipe around the 2" pipe and patch the concrete then you got enough room for your drain. If your familiar with kerdi drains this shouldn't post any problem.
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Old 02-21-2010, 01:08 PM   #6
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On my current job I had t jackhammer out around the 2 inch riser. Used my Hilti t-56, made short work of it.
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Old 02-21-2010, 02:41 PM   #7
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JC,

Anything to do with 3 or 4-in. pipe is commercial, or it's a roof drain.

Regular Kerdi drains are 2-in. Download the Kerdi Shower Handbook on the site.

http://www.schluter.com Look in "shower systems."

I move drains in concrete all the time.
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Old 02-21-2010, 10:44 PM   #8
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I know what size the kerdi is John...

Rick hit the nail on the head why they show the 4 inch drain in the diagram....thats what the diagram says also..

Quote:
if you put 4" pipe around the 2" pipe and patch the concrete then you got enough room for your drain.
well yea, but if you do a mudbed you just fill it all in at the same time.

That diagram is just for the foam pan cause you put the drain on after the base is down. it all makes sense now. Yet another reason to NOT use the foam pan. imho
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Old 02-22-2010, 09:30 AM   #9
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I think that way you just have plenty of room to clear the drain and get it all the way down. I actually use the bottom half of a gallon jug and cement to that. Leaves me plenty of room for the drain.
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Old 02-23-2010, 03:09 PM   #10
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Chad you are referring to the foam base right? You don't do it for mud slopes do you?
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