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Old 02-27-2004, 09:40 PM   #1
Loons
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Join Date: Feb 2004
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What trowel size for 18 inch tile?

What size gives the best adhesion on 18 inch tiles?
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Old 02-27-2004, 09:49 PM   #2
gpzrider
Tile Contractor -- Charleston, S.C.
 
Join Date: Aug 2002
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I believe you'll get a variety of opinions here; but, I would recommend a 1/2" notch trowel to set the 18" tile. It's also a good idea to flat back the tile in conjunction with notching the floor. Be sure to pull your trowel in one direction.
Is this a porcelain tile?
What type of subfloor are you dealing with?
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Old 02-27-2004, 09:56 PM   #3
Loons
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Sorry what does flat back mean? Im not english so i have some problems with some words. The subfloor is concrete slab, it has no cracks in it and is very level. Its a ceramic tile
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Old 02-27-2004, 10:25 PM   #4
stullis
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Join Date: Mar 2002
Location: Home of Sinclair Lewis, Sauk Centre, MN
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Some tiles will have a curve to them. Backbuttering or flat backing takes that curve out as well as "burns" or keys the thinset to the tile which results in better adhesion.

Flat troweliling the back of the tile and having a flat subfloor to set on I would use a 3/8" notch trowel.
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Old 02-28-2004, 05:26 AM   #5
gpzrider
Tile Contractor -- Charleston, S.C.
 
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using the flat side of your notch trowel; fill the 'divots' / lugs in with thinset. Hold your trowel tight against the tile. Always hold your trowel at approximately a 45* angle.
When I was in Florida, the slabs were fairly flat, as best I can remember and that has been some years back. Now, I'm in South Carolina and I can't find a flat slab.
Using a large format tile will accentuate any uneveness in your slab.
Periodically lift and check the back of your tile to ensure that you're getting a good bond transfer.
Custom Marble and Granite Mortar mix or a similar non-slumping/sag mortar works well with large format tiles.
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