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Unread 01-08-2019, 03:23 PM   #16
cx
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Wherever are you from, David? That "yawals" would be y'all's hereabouts.

You want to finish that curb with what the ceramic tile industry refers to as fat mud. That's essentially deck mud with some slaked lime and a little more water added. If you'll visit our Liberry and find the Shower Construction section you'll find good information on the various ways to make and apply what you need.
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Unread 01-08-2019, 03:28 PM   #17
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Tennessee. I used my voice to text and it created yawals. I guess that’s how apples programmers think it’s spelled!

Forgive me because I’m new here. What is the liberry?
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Unread 01-08-2019, 03:36 PM   #18
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Them programmers obviously ain't from around here, eh?

If you'll put your geographic location in your User Profile it'll remain permanently in view to aid in answering some types of questions.

The Liberry appears in the dark blue bar at the top of the page. I've also now linked it in my post above yours.
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Unread 01-08-2019, 03:45 PM   #19
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No they’re not! Thankyou!
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Unread 01-08-2019, 04:21 PM   #20
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Can I put my waterproofing membrane over the mortared shower curb with the rest of the shower walls and shower floor pan ?
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Unread 01-08-2019, 04:22 PM   #21
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I wanted to waterproof membrane the entire shower for extra security
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Unread 01-08-2019, 04:41 PM   #22
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If you're using a traditional receptor with preslope and liner I wouldn't use any waterproofing on the pan. There's no way to effectively tie kerdi into a clamping drain, and that will cause possible moisture issues. As far as the curb well I cant say it would hurt but I don't see the need if the rest of the pan is properly built. The walls are prepped with moisture barrier then CBU correct? If so then adding a membrane on the face Could cause moisture issues.
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Unread 01-08-2019, 05:19 PM   #23
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The walls have tar paper then Hardi backer board. The floor is preslope, pan liner and pan. I’ve got three different books on tiling, plumbing and bathrooms. Each one shows using membrane that you paint on.

I’m no expert, but if there is a waterproof membrane wouldn’t that prevent moister from making its way past it to the cement board and so on?
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Unread 01-08-2019, 05:52 PM   #24
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What I was going to use is mapei’s aqua defense, that you paint on.
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Unread 01-08-2019, 06:17 PM   #25
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If you have tar paper behind the Hardi then I'd leave it like that and tile it. With two membranes we fear a moisture sandwich. Most here advise using one membrane.

Same thing on the curb. You have the liner under the mud, no need for another membrane. More isn't necessarily better in this case.
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Unread 01-09-2019, 11:13 AM   #26
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Alright, thanks.

So I have another question. I formed my curb last night and used sakrete, type s mortar mix to do so. I read the information for a shower curb and fat mud found in the liberry. It seemed as if it contradicted itself though. It stated fat mud is different than deck mix because it has lime in it and is mixed wetter. Then in the shower curb section it said to use the same mortar brick layers do but to make the mix stiffer than they do.

I interpreted that as it needed to be made with less water. The 80lb bag I bought called for 5.3 quarts of water. So I mixed it with at least 4 quarts then added another quart, if not a little less than a quart. The mix seemed thick and wet. It wasn’t soupy but it wasn’t like peanut butter either.

I troweled it on and it shaped very well and held itself up. That was about 11 hours ago. Today when I look at what was left in my wheel barrow it’s very crumbly and can easily be chopped up with a shovel.

The curb looks really nice. It’s formed nicely and seems hard. I’m not sure how long I’m supposed to let it cure?

My fear is that, did I mix it too dry and now it will not harden as it’s supposed to? I’m basing that fear off of how crumbly the mortar is in the wheel barrow.

Does it need longer to cure?
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Unread 01-09-2019, 11:17 AM   #27
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Here are some pictures of it currently, along with what was left.
Attached Images
    
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Unread 01-09-2019, 11:21 AM   #28
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Typically the mud for curbs is a bit wetter than deck mud. If what you have up is solid and not flaking off, then don't worry about it, it'll probably be fine.

You can't really compare it to what's dried out in the wheelbarrow.
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Unread 01-09-2019, 11:27 AM   #29
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It is hard but I can chip the sharp edges off if I want to. How long should it take to cure? It’s been about 68 degrees in the house.
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Unread 01-09-2019, 12:22 PM   #30
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Let it sit another day or two.
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