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Old 11-08-2010, 09:55 PM   #1
mellingson
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Shower Pan over concrete ?

How do you correctly install a shower pan on a basement foundation? I'm a weekend warrior who questions the stability of the kerdi tray and is leaning towards a custom pan. Thanks

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Old 11-08-2010, 10:07 PM   #2
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Mike,

Read the shower construction thread in the library.

The Kerdi tray will work well if you have a level floor. I prefer mortar beds myself. In your scenario, you would install a bonded dry pack mortar bed.
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Old 11-08-2010, 10:15 PM   #3
Brian in San Diego
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You might also want to read this from the Mudmeister himself. When you pack the deck mud over a concrete slab you'll want to pour a slurry (tomato soup consistency) of thinset on the slab prior to packing the deck mud to get it to bond.
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Old 11-08-2010, 10:18 PM   #4
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^does it need to be a traditional pan with preslope and liner or can this pan on concrete be constructed and waterproofed with hydroban?
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Old 11-09-2010, 03:37 AM   #5
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You can use Hydroban as your waterproofing directly over the mud pan. You can either use the Kerdi drain or a standard clamping drain and a divot.

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Old 11-09-2010, 05:37 AM   #6
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If anything in those threads confuse you come back and we will answer them.
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Old 11-11-2010, 11:27 AM   #7
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leaning towards the divot method with hydroban. I have been following gueze's thread in the other forum for some time now. what do you guys recommend for doin the curb on a basement slab? height etc. thanks
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Old 11-11-2010, 11:07 PM   #8
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Over concrete I usually form up for a concrete curb five inches high, and 4 1/2" thick, which should match the thickness of the walls. If there are no walls in line with the curb, you can make it any thickness you want. I bond the concrete to the slab with a little thinset. For a little extra strength, I usually drop a couple pieces of rebar in. Probably overkill, but it only costs a couple extra dollars.

You don't want to use treated lumber, and even kiln dried lumber is susceptible to moisture migration from the slab, which can cause undue expansion.

You can also use deck mud if you want, I think quite of few installers do that.
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Old 11-11-2010, 11:18 PM   #9
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If you don't have walls to meet up with I like to make my curb bigger, just so I don't have to cut all the bullnose down. But on slab I generally form it and construct it outa deck mud. I always use a liner, but if you are going to do a hydroban shower making a mud curb will be even easier, only one step.
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