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Unread 01-02-2014, 06:43 PM   #16
Brihen
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Kerdi

Well I'm pretty sure I will be going the kerdi route after some on line research. After watching their video they sure make it look easy enough. I still have a lot of tear out and won't know how much until I get more into it. My firs question is about the drain. I will have to remove this old cast iron ( I think its cast). I might have a plumber come in or maybe attempt the replacement myself. Since some of the boards are rotten I might be able to do it from above when I rip them out. If I cant do it from above I will need to get someone, because I can no longer crawl around in an 18" crawl space.
Any tips or thoughts on doing the drain install? When in the process do you install the kerdi drain, and any ideas on how to remove the old one? Thanks.
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Unread 01-02-2014, 06:54 PM   #17
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Also the floor is 2x6 T+G on post and beam. I guess I will have to cover this with some PW before the mud and Kerdi base. What thickness PW would you recommend? I am also going to tile the floor as well and used 5/8 or 1/2 (don't remember which) with 1/4 Hardi backer on my other BR remodel. That BR had a tube surround so I am not familiar with a shower base.
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Unread 01-02-2014, 07:06 PM   #18
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Since you're into it this deep, I would go ahead and change the P-trap too. Just a matter of removing enough wood to get to it and cutting the drain just beyond the trap. Install a new trap and drain using a Fern-co type fitting. Some call it a no-hub fitting.
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Unread 01-02-2014, 07:28 PM   #19
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Will the thickness of the T+G plus some plywood present any problem with the length of a kerdi drain?
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Unread 01-02-2014, 07:45 PM   #20
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Just to be clear, are you asking if the drain will be too short by the time the plywood is in place?
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Unread 01-02-2014, 09:01 PM   #21
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yes. the boards are 1.5", and I would like to use as thick a piece of PW as I can.
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Unread 01-02-2014, 09:09 PM   #22
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The riser drain pipe will usually be 2 inch. The hole in the subfloor can be larger. The length of the riser can be figured out when you're replacing the drain.
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Unread 01-02-2014, 09:47 PM   #23
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So it sounds like you could make it almost any length you wanted to as far as lets say you used PVC pipe cut to what ever length you needed? And the actual assembly from Kerdi would be able to be used in say a thickness of sub floor 2" or even say 2.5". I would probably actually use 5/8 PW with the 1.5" T+G.
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Unread 01-02-2014, 09:59 PM   #24
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Hi Brihen, by the time you get the drain installed the riser will be bout an inch lower than the top of the subfloor. The Kerdi drain can be installed 3/4 of an inch above the subfloor. That is the minimum.
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Unread 01-03-2014, 09:44 AM   #25
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Kerdi board

Do you guys use the Kerdi Board also for the walls?
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Unread 01-06-2014, 09:45 AM   #26
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Kerdi board

I will through this out there again. Do you guys usually use the Kerdi board for the walls or CBU or drywall? Thanks.
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Unread 01-06-2014, 10:17 AM   #27
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Brihen, the choice of wallboard for your Kerdi shower is entirely up to you. If you plan to use Kerdi membrane, the manufacturer's recommendation is gypsum drywall.

I strongly recommend you download the Kerdi Installation Handbook from the manufacturer's website and do some reading before you continue.

My opinion; worth price charged.
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Unread 01-06-2014, 01:21 PM   #28
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Thanks. I have read quite a bit on their web site and if I go with Kerdi I will buy Johns book also. I am 90% sold on it so far. I saw where they said drywall, but I have heard so much about the evils of DW in a shower ( even though that is what many old ones like mine had ) that I was wondering if something else would be a better option. What would you use?
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Unread 01-06-2014, 01:26 PM   #29
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Also I would like to tile the ceiling in the shower after raising it from its current 82" to 8' like the rest of the BR. Any tips or warnings there?
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Unread 01-06-2014, 02:08 PM   #30
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Regular white drywall is just fine to use in a kerdi bath. But you asked what would I use and it would be this,,,,

http://www.homedepot.com/p/Custom-Bu...specifications

On the ceiling I like to use 5/8in. drywall but that's just me. Make sure your framing is no more that 16in. on center with the ends fully supported and use more screws.
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