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Old 03-18-2018, 04:13 PM   #1
Joel Cason
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Combining Kerdi Board with kbrs shower pan

I am in the process of rebuilding my shower, Took it all the way to the studs. I installed a kbrs shower pan and am pleased with fit and construction. After installation, i saw an advertisement for kerdi board and marveled over the lightness, ease of cutting, waterproofness etc. Would there be any major problems anticipated if i used kerdi board with the kbrs pan instead of cement backer board?
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Old 03-18-2018, 04:57 PM   #2
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Welcome to the forum, Joel.

No, there arenít any technical incompatibilities. Of course youíre splitting up systems, so you donít have a warranty. But it sounds to me that youíre more interested in something that works rather than relying on a warranty.

You said youíre pleased with the base fit and construction. How did the install go? What material did you use to support the base?

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Old 03-18-2018, 05:26 PM   #3
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Thanks for the welcome

The pan sits on 3/4" plywood on 16" centers. I had an offset drain so had a custom pan built and they nailed the dimensions. Installation was easy and went very smooth.
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Old 03-18-2018, 05:35 PM   #4
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thinset

I forgot to say that there is a bed of modified thinset on the plywood. Used a 3/4" trowel they supplied. The drain is sealed with 100% silicone.
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Old 03-20-2018, 01:15 PM   #5
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How long can I delay grouting.

I will not be able to finish tiling my shower before having to leave for 3 days. Is it okay to let ungrouted tile sit that long without grouting ?
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Old 03-20-2018, 01:21 PM   #6
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Yes. The tile won't care. The only thing that may be an issue is if dirt got in the joints prior to you grouting it. Depending on the thinset you used, having that joint open means (if it was a modified thinset), the thinset will have a chance to dry out more. It's a good idea to run a damp sponge over things prior to grouting. Not wet, damp, or use a damp brush.
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Old 03-20-2018, 05:15 PM   #7
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Thanks Jim

Good to know. Iíll be sure and clean spaces before grouting.
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Old 03-21-2018, 05:51 AM   #8
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you should clean the spacers and any thinset that needs cleaning before you leave out of town. the longer you wait the harder it will be to clean.
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Old 03-21-2018, 01:44 PM   #9
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Thanks Jerry
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Old 03-22-2018, 02:41 AM   #10
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i have delayed grouting some tiles i laid in my rental property for about 6 months so far
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Old 03-22-2018, 07:44 AM   #11
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Thanks Jim
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Old 03-26-2018, 05:37 PM   #12
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Kerdi board washers

I am trying to get a feel for how far to tighten the kerdi board washers down. I have looked at the videos and it appears that they tighten until the washer is below the plane of the board rather than flat against the board.I donít want to arbitrarily do this until I know the board wonít be damaged.
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Old 03-26-2018, 05:49 PM   #13
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Go far enough so that there isn't a lip, but you've not cracked the surface layer. The material does bend when it is compressed. When you then add the Kerdiband, it should not have a hump around the washer or screw head and your trowel won't catch on it. Try it a couple of times on a piece of scrap, and you'll see what I mean.
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Old 03-26-2018, 06:24 PM   #14
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Thanks Jim. I do have some scrap and will practice.
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Old 03-26-2018, 06:52 PM   #15
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The foam is the waterproof layer, so there is little risk of pushing a washer through the foam
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