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Unread 03-31-2015, 09:19 AM   #1
dan737
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Trowel Notch Size for 12x24 Floor Tile

What Trowel Notch size is recommended for 12x24 Floor tile.

Thanks
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Unread 03-31-2015, 09:29 AM   #2
cx
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Welcome, Dan.

Whatever trowel gives you the required 80 percent coverage (presuming a dry area) on the back of each tile with good coverage on all edges and corners while maintaining a minimum mortar thickness under the set tiles.

If your floor is flat and your tiles are flat, you might do well with a 1/4"x3/8th" square notched trowel.

Flat, for the size tile you're asking about, per ceramic tile industry standards, is no deviation from intended plane of more than 1/8th" in ten feet nor 1/16th" in two feet. That is a very flat floor and you'll wish it were flatter when you begin setting those tiles.

Lot of other considerations for your floor as well, but we'd need more details to advise further.

My opinion; worth price charged.
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Unread 03-31-2015, 10:09 AM   #3
dan737
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Thank you for the quick response. The floor is pretty flat
does it also matter if the tile type is Marble?

Thank you,
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Unread 03-31-2015, 10:23 AM   #4
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"[P]retty flat" doesn't tell us much.

Being a natural stone tile matters a great deal in how the subfloor is construted, something about which we have no information at all.
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Unread 03-31-2015, 10:49 AM   #5
dan737
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Subfloor is level. I then installed the 1/2 hardiebacker with thinset underlayment. Tile size 12x24 Marble..can I still use the 1/4"x3/8th" trowel
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Unread 03-31-2015, 12:29 PM   #6
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Dan, your tiles don't give a rat's patooti about the floor being level, they care only about it being flat, and for tiles that size they care very, very much.

And the marble cares very much about the deflection of the subfloor, which I why I mentioned we'd need a good deal more information about it. You can enter the relevant information into the Deflectometer in the dark blue bar above to get a go/no-go reading on the joist structure, and then tell us about the subflooring.

The 1/2" CBU (of whatever brand) is not what the manufacturer would have recommended, but it's not a problem if installed over a suitable subfloor and doesn't increase the overall height more than is comfortable.

My opinion; worth price charged.
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Unread 03-31-2015, 07:26 PM   #7
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I use a 1/2"x1/2" notch for that size of tile.
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