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Unread 10-06-2021, 09:43 AM   #1
Chowchewey
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Durock curb?

I have repeatedly read here there is no acceptable way to use CBU to construct a curb due to screws/nails penetrating the waterproofing. The youtube below though presents a different technique without screws. Thoughts? Perhaps not a textbook technique, but would it work for a DIYer? Thanks.

https://www.youtube.com/watch?v=Cl2X9kSoDfg
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Unread 10-06-2021, 10:24 AM   #2
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We've seen similar videos and comments about that method, Art. It's possible it could work if properly executed and if the final mortar bed on the shower floor locks the bottom of the inside face of the curb piece, and........

I'm still not gonna recommend it to our visitors, though. I honestly don't see the savings, either in time or material, over the traditional metal lath and fat mud, which has been shown to work well for many decades. 'Fraid I just don't see that as an improvement.

I'm sure there will be other views.
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Unread 10-06-2021, 05:02 PM   #3
Chowchewey
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I was thinking in terms of a 2 x 4 curb then CBU then a membrane this method may be useful for a DIYer. For a pro I'm sure the tried and true methods are easy to pull off but are rather daunting for some (or at least 1!) DIYer. Just my opinion. I appreciate the response.
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Unread 10-06-2021, 08:06 PM   #4
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Art, if you're doing a traditional shower receptor with a pre-slope, liner, and mortar bed, you do not want to have any direct bonded waterproofing membrane over the curb, regardless the material you use for the curb. The PVC or CPE liner is your waterproofing membrane and you want only one.

My opinion; worth price charged.
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Unread 10-07-2021, 06:00 PM   #5
ceramictec
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I wouldn't do a curb that way. I wouldn't trust it.
Easiest way when doing a traditional liner is to wrap it with metal lath.
Attach with screws on the outside or use a piece of cementboard
to get a level height to screed off of, fold lath up and over and into the pan
(be careful you don't poke the liner with the diamond lath sharp edges)
Then mud pan to lock the wire in and use a fat mud on the curb.

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I only do liquid and sheet membranes now so screwing cementboard to the curb is negated buy the membranes.
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Unread 10-08-2021, 11:58 AM   #6
Just In Tile LLC
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Brain I have never wrapped my wire inside the bottom of the pan like that, but I really like the idea of how locked in it would be when everything is mudded up.
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Unread 10-08-2021, 03:02 PM   #7
tilemanct
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We always do the fold at the bottom into the pan. A wire and mud curb is the best!! Please don't do what was in that you tube video. That is way more work than a mud curb.
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Unread 10-08-2021, 07:22 PM   #8
Davy
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Brian, if you use CBU on the outside of the curb, aren't you forced to nail the lath on the top? I guess along the outside edge wouldn't be so bad.
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Unread 10-08-2021, 09:42 PM   #9
Tool Guy - Kg
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I was thinking that Brian was running the lath to the outside face of the curb like “usual”, but sandwiching it with the cement board.
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Unread 10-09-2021, 02:51 AM   #10
ceramictec
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Quote:
Easiest way when doing a traditional liner is to wrap it with metal lath. Attach with screws on the outside or use a piece of cementboard to get a level height to screed off of, fold lath up and over and into the pan
Attach the wire on the outside and wrap it up and over and into the pan, the mud locks it in. And as it says you *could use a piece of cement board which you would attach that to the face of the wire just for a screed height gauge. NO screws on top or inside
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Unread 10-10-2021, 03:27 PM   #11
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We've had an article here for years on how to build a mortar and lath shower curb. I've never thought about running the lath into the shower floor, but that's a good idea, too.

https://www.johnbridge.com/how-to/shower-curb/
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