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Unread 09-10-2022, 08:18 AM   #1
Fluke216
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Backer board/ curb question

Doing a shower with cement board mud bed with small concrete curb at entrance. Going to do a mud bed an flo fx drain with bonding flange then liquid membrane the whole thing. Questions are do I sit the cement board on the floor or keep it up a 1/4 I’m. It sure if it matters as the mud bed is going to go in anyway and lock it in. Other question is do I put the co Crete curb before or after the cement board I assume before but wasn’t sure any advice is greatly appreciated. Thanks
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Unread 09-10-2022, 09:47 AM   #2
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Welcome, JW.

Don't think I know what "co Crete" might be, but you could do the curb/CBU in either order, as far as I'm concerned. I'd likely recommend curb first, but I can't say why.

What's the yellow stuff for?

Can't get that drain any closer to the center of the shower footprint?

My opinion; worth price charged.
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Unread 09-10-2022, 10:26 AM   #3
Fluke216
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My bad concrete curb, originally that was roughed in in the center then I changed the shower size it looks worse because of the angle of the photo. Maybe I I have the roof for an offset fitting or something. I put small strip of hardie underneath the 2x4 then the plastic between the hardie and 2x4 I didn’t want to use a treated bottom plate in this location.
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Unread 09-10-2022, 10:49 AM   #4
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Mmmmm. Interesting approach to the plate isolation from the SOG. Not sure just what the Hardiebacker will do for, or to, you in that application.
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Unread 09-10-2022, 11:02 AM   #5
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Yea the floors heated in there and wanted to avoid using treated lumber the slabs insulated and prob won’t see any water anyway but came up with this.
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Unread 09-10-2022, 12:15 PM   #6
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Well, I can understand the polyethylene sheeting (I'm guessing) to protect from moisture vapor emissions, if any, but what was the purpose of the Hardiebacker, JW?
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Unread 09-10-2022, 02:07 PM   #7
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I guess just to separate the plastic from right on top of the concrete
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Unread 09-10-2022, 03:19 PM   #8
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Hi,

It doesn't matter how far down the backer board goes as long as it goes flat against the studs Maybe hold it up a quarter to half an inch frim the floor. Then do your concrete curb, and finally, the mud floor.
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Unread 09-10-2022, 07:14 PM   #9
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Ok that’s what I was thing in thanks alot
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Unread 09-11-2022, 10:31 AM   #10
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Concerning concrete curb.

I've never done this but if I did, I'd mix the concrete on the dry side and let it cure before tiling. Plastic over is for a week would be prudent too. Typical time to cure is 28 days.

Concrete cracks and letting it cure first would help to mitigate cracks telegraphing though waterproofing and tile later. I'd also use fiber reinforced mix.

My own heated shop floor has developed cracks years down the road, so I get to remind myself almost daily.
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