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Unread 11-30-2013, 05:23 PM   #1
Kbike
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1/4 inch out

I have a window in a shower I want to use a marble window sill. But it is off approximately 1/4 inch out of level what should I use to make up the 1/4 inch? It has hardie backer on it now. I was thinking a few thin coats of thinset with 24 hrs between. I am as newbie as newbie can be this will be my first time setting marble.
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Unread 11-30-2013, 05:31 PM   #2
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Welcome, Kevan.

You don't want a window sill in a wet area to be level, you want it to slope to drain by at least 1/4" per horizontal foot and, even more importantly, you want the waterproofing layer to slope that much, also.

What waterproofing method are you using for your shower?

Thinset mortar is not an appropriate product to use for leveling or flattening the substrate, although it is regularly used.

Without knowing just what you need to do, it's difficult to advise further. A photo of what you're working on would help.

My opinion; worth price charged.
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Unread 11-30-2013, 05:51 PM   #3
Kbike
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The sill has pitch to shower tub area. The owner before me put a glass block window in and the old sill is to the left 1/4 low with a level it has hardie backer and like a red guard over the hardie backer. And that siliconed to the glass block.
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Unread 11-30-2013, 06:36 PM   #4
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I'd use some white thinset to level it out, let it dry overnight, and use the same thinset to set the marble sill. If it wasn't already waterproofed and tile-ready, I might have another suggestion, but at this point I think thinset would be best.

Is the window crooked as well, or just the frame?
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Unread 11-30-2013, 06:48 PM   #5
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Just the frame
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