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Unread 11-29-2021, 07:49 PM   #16
cx
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Aw, hell. And here I thought Davy was fixin' to learn me something. Again.
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Unread 11-29-2021, 08:03 PM   #17
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No worries, thanks Davy!

One quick unrelated follow-up - just confirming that y'all would recommend avoiding metal lathe or mesh in the top (i.e. above pan liner) layer of mortar, in the name of hole-poking-safety? I see that's generally been the recommendation in the past, but the drain I'm using requires a minimum 1.5" thickness in that top layer, so I figured I'd doublecheck that's still okay unreinforced.
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Unread 11-30-2021, 06:59 PM   #18
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It's not needed.
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Unread 11-30-2021, 07:10 PM   #19
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Kyle, the tile industry standards require the top mortar bed be a minimum of 1 1/2" thick. You'd never put metal lath in there, but for many years welded wire mesh was required. Today, the mesh is required only if your shower floor exceeds 65 square feet, which is uncommon in residential showers.
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Unread 12-02-2021, 10:50 PM   #20
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Awesome. Good to know, thanks again!
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Unread 12-07-2021, 12:26 AM   #21
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One note, mainly for any future readers of this thread - my original drawings, of course, wouldn't make sense for the preslope. In retrospect, this seems obvious, but I didn't realize it until I was mid-mudding!

The issue is that linear drains still use the same circular drain base as any other drain, so the 36" long flat drain plane shown in my drawings only applies to the top mortar bed. The preslope still needs to be sloped down to the single point of the drain base, rather than merely to the linear drain's surface footprint.

This does mean that my top mortar bed won't be exactly 1.5" thick everywhere, and will be fractionally thinner around the side edges of the lines drain, but otherwise wasn't a big deal to adjust for. Just figured it was worth the correction!
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