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Unread 11-02-2020, 09:18 AM   #20
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 91,863
Dave, the object of the game is to end up with a minimum of 95 percent coverage on the back of each tile with a mortar thickness of a minimum of 3/32nds of an inch. How you get there is entirely up to you.

If your substrate is sufficiently flat and your tiles are sufficiently flat, you shouldn't need that very large 1/2" square notched trowel, but that seems to be what folks are using for those large format tiles. It is not necessary to "back butter" the tiles, but it is necessary to key-in mortar to the backs of the tiles before setting them into the notched mortar on the substrate. You don't want any notch at all for the trowel to key-in mortar to the back of the tile, you use the flat side of whatever trowel you're using to notch the walls.

You'll need to try setting a couple of your tiles using your mortar and your trowel and your technique and pulling them back off to determine what it will take for you to get the coverage you need with the least squeeze-out into the grout joints. The coverage is required; the minimal squeeze-out is desired.

My opinion; worth price charged.

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