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Unread 01-14-2009, 01:22 PM   #1
Karde
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Use Kerdi on a shower that already has a membrane and drain installed by a plumber?

Hi All,

My walk in shower already has a membrane (black plastic from what I can tell) already installed along with the drain. The membrane seems to closely follow the plywood underneath (not sure if he put cement board or a special kind of plywood under this membrane, but I can try and check when I go back tonight.) It attaches itself to the bottom of the drain, so there is no weeping system that i can see for any liquid that makes it down to the membrane to make its way to the drain and down the hole.

I am wondering if there is a benefit for trying to protect the areas to be tiled with kerdi products or not not that this membrane is already in place? Any suggestions on what I have to work with before I get ready to tile the area?

The show is 4ft x 3ft.
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Unread 01-14-2009, 01:32 PM   #2
e3
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there needs to be a slope under the membrane.The membrane needs to meet plbg. codes and should have the UPC logo stamped on it.The weep holes are in the drain itself and not always noticble if you dont know what your looking for. You dont want 2 membranes.
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Unread 01-14-2009, 03:10 PM   #3
Karde
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ok,
-so the slope goes under the membrane,
-leading towards the drain leaving the weeping hole exposed (I will have to go check for those)
-I should be able to thinset on top of the membrane, but not use this thinset to build the slope (correct?)
-Tile in thinset
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Unread 01-14-2009, 03:17 PM   #4
ceramictec
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Hi Karde,

is that your real name ?


this should help you understand the preslope, liner and deckmud process:

http://www.ontariotile.com/preslope.html
Quote:
-I should be able to thinset on top of the membrane, but not use this thinset to build the slope (correct?)
No
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Unread 01-14-2009, 03:17 PM   #5
bbcamp
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The pre-slope (under the liner) is made of deck mud, a 4 or 5 part sand to 1 part portland cement mixture. Once the liner is in place, a 1-1/4 to 1-1/2 inch thick setting bed is placed. It, too, is made of deck mud. The setting bed follows the same contour as the preslope, so it is of uniform thickness. After the setting bed is dry, you can thinset the tiles to it.

Please read the Shower Construction thread in our Liberry.
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Unread 01-14-2009, 03:36 PM   #6
e3
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might help -see the "full mortar bed application.
http://www.noblecompany.com/Technica...0/Default.aspx
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