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Unread 12-10-2007, 10:41 AM   #1
DavidHo
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Sunken shower floor

I am new to the site and did a liberry search but didn't read or at least don't think I read the same scenario I have at home.

I am building a house and have a 4'x6" shower that I am going to attempt to tile(maybe). I have laid thousands of square foot of tile on concrete floors but can't convince my wife that I may be over my head on a shower.

The details are as follows:

1. The 4'x6' shower footprint is sunken 4" in my main slab. The drain is in and placed in the center. I have been told that I do need a liner and I've been told I don't. We don't want a curb, we want to step down into the shower. The walls are one exterior block wall firred and covered with Durarock on a 6' side and he other two side walls are wood frame also covered with Durarock. I didn't have the plumbers place a liner before the Durarock was put in place because I was told I didn't need one. Now I'm being told that all showers should have a liner or membrane. What's the truth?

2. Second Question. What should I use to create the slope for drain. I read in the liberry that I need to use the deck mud but was thinking that was over a liner or on a shower with a curb. Can I just use a sand topping mix and create the slope with that using the 1/4 in. per foot rule of thumb.

I may have more questions but this will get me started or get me to hire it out.
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Unread 12-10-2007, 11:26 AM   #2
Scooter
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You need a membrane, liner, shower pan (called different things) which is typicallty a 60mil rubberized membrane which is tacked onto the walls under the Durrock and over a sloped mortar bed.

The sand topping mix will be a little rich (too much portland cement) to use, but you can add some sand to it. There is a formula in the Libary.
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Unread 12-10-2007, 12:04 PM   #3
DavidHo
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Thanks for the info Scooter. I saw the formula and the post regarding the mud mixture just wanted to know if it also applied to concrete floors.

Thanks Again
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Unread 12-10-2007, 12:52 PM   #4
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David, are you from southwest GA? Just curious?
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Unread 12-10-2007, 02:18 PM   #5
DavidHo
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No I am from East Central Florida near Daytona.
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Unread 12-10-2007, 05:31 PM   #6
John Bridge
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Hi David,

Bond the mortar to the concrete floor with a slurry of "loose" thin set. Smear it on the slab just prior to dumping your deck mud.

Also, Scooter mentions 60 mil material. I've never seen it. Around here we use 40 mil. That's what you'll find available, I think.
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Unread 12-10-2007, 06:32 PM   #7
scuttlebuttrp
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You still need some kind of membrane though. Since your walls are up already; I'd use a surface applied one. Kerdi, Nobleseal TS are sheet membranes that are good. TEC tripleflex, Mapei PRP 315, are applied with a trowel. Custom's Redguard is a good roll on membrane. Make sure you follow the directions on any of these and you'll be good.
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Unread 12-10-2007, 09:03 PM   #8
Stealthfox
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Quote:
Originally Posted by john bridge
Bond the mortar to the concrete floor with a slurry of "loose" thin set.
when you say "loose" do you mean mixed to a similar consistency as the mud for the mortar bed, or mix like you would for setting tile?? just curious as i may be doing a shower pan on concrete sometime in the future, does it matter if its modified or not??

thanks
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Unread 12-11-2007, 06:17 AM   #9
dgunnels
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OK, I know a guy here named David Ho and wondered if it was you.

Do what these guys say. They won't steer you wrong. BTW, we love pics. They really help.
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Unread 12-11-2007, 09:58 AM   #10
Deckert
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Quote:
when you say "loose" do you mean....
Mix it runnier/wetter than you would for setting tile.
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