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Old 02-21-2007, 09:51 AM   #1
pearl
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Join Date: May 2006
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Trowel size for 4x4 Kerdi floor tiles

I am getting ready to tile the floor of my Kerdi shower with 4x4 inch porcelain ceramic tiles and I had a few questions.

-What size trowel should I use?
-What would be a good grout joint size? I was thinking 3/32 or 1/8 but thought that might be too large.

Thanks for your help.

Paul
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Old 02-21-2007, 10:13 AM   #2
Brian in San Diego
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Paul,

I believe I used my 1/4x3/16 vnotch to set the shower floor over kerdi. My tiles were 2x2 porcelain. I don't think 1/8" grout lines are too big. In fact, with the 4x4, I would recommend it. Depending on the finish of your tile, there is the slip/fall factor in the shower. Smaller tiles (i.e. more grout lines) provide the necessary traction to prevent slipping.

Brian
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Old 02-21-2007, 11:19 AM   #3
Mike2
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Hi Paul.

I'll also vote for the 1/8" spacing and the 1/4x3/16" V notch which is what you most likely used to lay up the Kerdi . You want good coverage while at the same time minimizing the amount of mortar squeezing out into the joint. What it takes to achieve that will vary somewhat depending upon the tile, particularly how flat the backs are. Some have deeper recesses and thus may required a larger notch. You can also vary the amount of mortar spread out by changing the angle as you trowel it on.

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