what Trowel [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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08-06-2019, 02:12 PM
I wish to use 1 inch square natural stone in a shower over pan with Kerdi membrane. What knotch trowel should I use? It seems that the larger the trowel the more thinset that seems to get pushed up between the mosaic type tiles and requires a careful eye to get clean and the time to clean out the grout groove. I am probably doing something wrong. Anyway. what trowel for easiest and safest install.

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Tool Guy - Kg
08-06-2019, 07:02 PM
Hi, Bob.

A V-notch is less messy than a square-notch for little mosaics. Maybe you want to give a 1/4” V-notch a try.


08-07-2019, 05:55 AM
How thick are the 1" tiles, Bob?

08-07-2019, 08:49 AM
The tiles are .39 inches thick. Which has to help with the squeeze up between the tile.

08-07-2019, 12:28 PM
Like Bubba suggested then. The 1/4" V notch will probably do the trick.

I used a 1/4X1/4 square notch with my 2X2X3/8 and it worked really well. Yours being only 1X1's a little less mortar under them will be better. You might even try a 5/16X3/16 V notch.

08-07-2019, 09:53 PM
How wet the mortar is has a big influence on how easily it will squeeze up into the joints. And you want it wet enough that it will adhere good but dryer as long as it's mixed to spec and you get good coverage when you try to pull them off will squeeze up much less in the joints. I've actually started weighing my powder and measuring my water additions to my thinset. It has helped me.

08-08-2019, 07:51 PM
Check your walls with a straight edge and get them as flat as you can before you ever start spreading thinset. If the 1/4 inch v-notch leaves too much thinset mashing thru the joints, go with a 3/16 v-notch. Using a flat piece of plywood or marble to slightly press on the tiles will help get the tiles flat.