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Old 03-17-2006, 12:40 AM   #1
cra
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18x18 porcelain tile trowel size and thinset?

Need help selecting what type trowel and thin set I should use. Will be setting 18x18 porcelain tile on hardi board, this is for dining room/kitchen floor 300 sq/ft. One more thing what size grout should I use?


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Old 03-17-2006, 01:12 AM   #2
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Hi Ryan, welcome to the site.
18 x 18s are pretty big, I hope the floor is pretty dang flat to begin with, or you'll be fighting those tiles to maintain "flat". Start out with a 1/2" trowel, but you need to check your coverage as you lay....that is, you need to pull a few tiles back off the floor after setting them to see how much of your tile is covered with mortar.

What mortar where you planning on using? A medium bed?

Grout size is a preference thing. With tiles of that size, 1/4" would be my starting suggestion.
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Old 03-17-2006, 07:35 AM   #3
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Hi Ryan, welcome! What Bubba said.
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Old 03-17-2006, 08:03 AM   #4
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also burn the backs with the flat side of trowel
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Old 03-17-2006, 09:31 AM   #5
cra
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Thanks Bubba, Kevin and Musky Mike

What would you guys suggest on the medium bed mortar? Something I can pickup at Lowes or HD would be good.

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Old 03-17-2006, 05:35 PM   #6
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we used customs marble and granite with 18x18 on running bond
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Old 03-17-2006, 05:49 PM   #7
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I've used the 3/8th and 1/2 inch notched trowels. My experience,you don't get any more coverage etc by using a 1/2 inch. I'll stick with using a 3/8th notch trowel....and if floor really bad,I'll flash float it prior to install. That's just me though,maybe it works for others.
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Old 03-17-2006, 05:55 PM   #8
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I'm no pro but I laid 20" x 20" porcelin tiles with a 3/8" trowel and FlexBond thinset. I also used 1/8" grout lines and couldn't be happier with the final product. IMO thinner grout lines look much better.
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Old 03-20-2006, 01:40 PM   #9
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I just did 20 x 20 porcelain 7/16 thick tile using a 1/2" trowel and the medium bed mortar. I laid it on my concrete basement slab. I must say, the medium bed mortar allowed me to easily level all tiles and minimize lippage. The floor, while level and basically flat, still was not perfect and it was helpful to be able to have that margin of safety with the medium bed mortar. Also, the medium bed mortar does not "sag" so once you have the tiles set at the hieght you want, even with a bit thicker bed under them, they will stay put while curing

Also, with any larger format tile (greater than 12"), I always back-butter the tile. Guarantees full coverage of the tile. Never have to worry that way.

I used 3/16" grout joints.

Came out just great.
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