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Unread 01-23-2008, 06:20 PM   #1
timothy
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thinset

The tile I purchased does not indicate the depth of thinset needed, the tile is ceramic 12 x 12 1/4 in. thick, made in Mexico in case that matters. Also I'm planning to use the Ditra product as underlayment on a 3/4 in plywood subfloor with 2 x 10 joists on 16 in. centers. I understand thinset installed under the Ditra should be trowelled to a minimum 1/4 in. depth, Anything special about the type of thinset to be used I should know?
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Unread 01-23-2008, 06:36 PM   #2
ceramictec
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you need to use an UN Modified thin set to set the tile on the Ditra.

have you checked your Deflection to make sure you floor can accept being tiled ?
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Unread 01-23-2008, 06:44 PM   #3
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I did thanks, according to the calculator I'm "good to go". As far as the UNmodified is concerned are they all pretty much the same? Is there a particular manufacturer I should be looking for? This will be my first big tile project aprox. 300 sq. ft.
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Unread 01-23-2008, 06:50 PM   #4
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Hi Tim,

Stay away from anything in the $6 per 50# bag range.

Some well-regarded, unmodified thinsets available at Lowes are Laticrete 317, Megabond, and Mapei's Kerabond. If you have some tile shops nearby that sell to consumers, they should be able to steer you right. If you're lucky, you might find some Ditraset.
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Unread 01-24-2008, 06:57 AM   #5
timothy
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Thanks, what sbout my original question on the proper trowel notch (depth) for the thinset under the tile. The tile is 12 x 12 1/4 in. thick made in Mexico.
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Unread 01-24-2008, 07:05 AM   #6
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Hi Timothy, use a 3/8" notch trowel.
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Unread 01-24-2008, 08:53 AM   #7
ceramictec
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Mike + 3/8" + your tile =
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Unread 01-24-2008, 11:41 AM   #8
Jaz
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Timothy,

Before you go any further let's see if I can help? First of all you MUST use a polymer modified thinset to install Ditra to your plywood subfloor. This thinset is spread with either a 3/16x1/4 V or 5/16x5/16 V trowel. I prefer the 5/16" V.

Now you can install the Mexican tiles using unmodified thinset mortar. A 1/4x3/8x1/4 square notch trowel should work fine? Are you sure your tiles are that thin? They're usually 5/16 or thicker. Hope is wasn't one of those 79 cents a ft. deals

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Unread 01-24-2008, 11:48 AM   #9
Don152
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Under the mat remeber to make the mix a little loose, but still able to hold a notch.. it helps get it on ALL of the fleece. On top of the mat I like Custom Building Products PremiumPlus. Im not a pro but it seemed to flow better and have a longer working time. Home Depot can special order it for you.. (but the avg Joe there might not know that)
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Unread 01-24-2008, 01:40 PM   #10
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Thanks to all who've replied, my plans have changed I'll be using backer board instesd od Ditra, most likely Hardibacker with 1 1/4 screws. Does this change the previos thinset requirements? Also is it acceptable to fill the void between the wall and backer board / tile with caulk, there's an exterior door involved.
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Unread 01-24-2008, 01:54 PM   #11
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Timothy, YES, it changes everything. You can use either unmod. or modified under Hardie, but you need modified thinset to install the tiles. Leave 1/8" between sheets that are staggered from each other and the subfloor seams. Leave 1/4" around the perimeter and other objects.

Depending on the layout, Hardie used to recommend expansion joints in the center of the floor if the room was 15 ft. or larger and where an L forms. I can't find that recommendation anymore. Matter of fact finding good directions for Hardie is hard to do, by design...maybe? Caulk in those areas is a good thing.

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Unread 01-24-2008, 06:50 PM   #12
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Thanks to everyone who has posted answers so far....one last question for today & I'll go away. I was wrong earlier when I said the tile was 1/4 in. thick it's actually 3/8. Given that with 1/4 in. backer board & 1/4 in. thinset under the board + 3/8 thinsetbetween the tile & cbu my math has the total floor @ 1.25 in. This floor will meet a hardwood floor @ 3/4 in. Is my math correct? If so, any suggestions on how to deal with the transistion? Sorry, it's been a long day and I've had a couple of beers.......
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Unread 01-24-2008, 08:48 PM   #13
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Your math is correct....but your theory is wrong! Your Hardie will be about 5/16" installed. The tile 1/2" installed. You'll be dead-on-nuts to the hardwood!

You'll end the tile with a metal L channel edging, leave a gap between it and the hardwood and then caulk or leave space for a wooden T molding which will cover both floors a little.

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Unread 02-02-2008, 05:15 PM   #14
timothy
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Grout Joints

Why does the manuf. specify a min. grout joint? Should a first time tiler go with the specified min. or go larger and if so how much larger? Thanks in advance for information.
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Unread 02-02-2008, 05:25 PM   #15
Scooter
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Because the fluxuation in the size of the tiles determines the minimum grout size plus about a 16th. Larger is always easier to set.

If you set them too close and there is a wide fluxuation, then you will be trimming tiles for days, and it will be really frustrating.
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