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Unread 05-20-2007, 03:02 PM   #1
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Join Date: Apr 2007
Posts: 3
Shower Pan Questions

Hi All,

I am building a 5 x 7 walkin shower in a new construction house. I dropped the shower floor 3 1/2" during the floor build up and then presloped the floor with the flooring osb and shims every 6" - all was glued and screwed! The floor is rigid. I have since hand laid 3 oz fiberglass mat to the floor and 6" up the wall, sealing to a standard PVC drain with a preformed (by me) fiberglass ring set with silicone. I built in a bench of wood and also have a window in the shower that is across from the shower head. The walls are covered with 1/2" osb because of shear and strength concerns. I will cover them with 1/2" Fiberock. The fiberock will bring the wall even with the drywall above. Being I now live in Washington - one of the mold capitals, I have become very concerned with mold and mildew.
I have been lurking in this forum for a few weeks and have become convinced that Kerdi may be my salvation. I now see a few options.

1) add more fiberglass (total of 6 oz mat), mud bed and tile. Secure the Kerdi to the pan with Kerdi-fix.

2)Use the Noble Flex drain ring to attach to the existing drain after removing the fiberglass around it. Build up a mud bed, covering all with Kerdi and attaching at the Noble flex drain ring with thinset/Kerdi-fix.

3) Rip out the drain, install the Kerdi drain and mud bed. Then Kerdi everything.

I am finding the costs are rapidly esculating!


Thank you, John R.
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Unread 05-20-2007, 03:19 PM   #2
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Join Date: Jan 2005
Location: Wildomar Ca
Posts: 9,177
Sounds like you are on the right track John. Kerdi is your best bet
when it comes to avoiding mold. You could put sheetrock up on your
walls vs. backerboard if you plan to use Kerdi, may save a few bucks
and is a perfectly acceptable underlayment for kerdi walls. Your mud
floor sounds good with the kerdi drain.
Jack Hamilton


Temecula Tile and Natural stone contractor
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Unread 05-20-2007, 09:47 PM   #3
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Jack, Thanks for the reply,
So you suggest option 3. Tear out the existing drain and go Kerdi all the way?
John R
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Unread 05-20-2007, 11:32 PM   #4
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Join Date: Mar 2005
Location: Tucson, AZ
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all or nothing, John - that's what he's saying.

the Kerdi shower is a system - not a basket of parts to mix and match. The drain, in fact, is really what makes the Kerdi system work.

"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government -- lest it come to dominate our lives and interests."

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