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Unread 05-12-2021, 01:25 PM   #1
frank_shic
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Join Date: Mar 2006
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Kerdi linear drain near joist

I decided to install a linear drain for a shower remodel however discovered that a joist as well as one of the water lines runs directly underneath where the drain would be situated if it was up against the wall so I'm wondering if it would be possible to install the linear drain offset (free-in-the-floor) approximately 5" from the wall and either fill the gap with dry pack mortar or cut into the kerdi shower pan more deeply and use the waste material to fill in the gap? If so, is it necessary to slope the small area behind the drain towards the drain?

My apologies the photo is rotated sideways despite the original being shot in the proper position with the drain facing downwards!
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Unread 05-12-2021, 08:55 PM   #2
jadnashua
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The drain can go wherever you want it in the pan, but if you're using the preformed foam one, that makes it a little more difficult.

Yes, the pan needs to be sloped towards the drain on both long edges of it. At 5" or so, that's less than 1/8" if you used the 1/4" per foot, and you can probably do that with the thinset beneath the cut foam part if you're careful about it. You still want 100% coverage, but it's possible. They'll tell you you can't use thinset to level things, as it is designed to be actually THIN, but 1/8" isn't much, and still within the max thickness allowed for most.
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Unread 05-14-2021, 02:30 PM   #3
frank_shic
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Thank you for the reassurance, Joshua! I was originally tempted to try notching the joist but I heard that's a bad idea structurally and in addition, the joist sits right on top of a concrete foundation so that pretty much ruled that out as an option. The other idea I was considering was running the drain right up against the shower curb but wasn't sure if that would look good. Anyways, I've already crawled under the house, cut out the prior drain and almost ready to glue in the new drain.

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