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Old 04-07-2006, 08:13 PM   #1
ben74
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New Basement Bathroom

Hello, I have been lurking on the forum for almost a month. During that time I have been busy with a new bathroom in my basement. Thanks to this forum I have purchased kerdi, ditra, and the kerdi drain.
I have some question before I start the kerdi install. I am a dyi’er and only have a few small tile jobs under my belt.

Before I bought the kerdi I installed Hardibacker. I know to wet the Hardibacker before installing the ditra, can I use grey versabond to attach the kerdi to the CBU? What size trowel (available for purchase at HD)?

I plan on doing the walls first, then installing the sloped shower floor. Is this acceptable?

Trowel Size Questions:
10X13 ceramic wall tile to kerdi, what size trowel?
12X12 ceramic floor tile on top of Ditra, “ “ “
2X2 mosaics for the shower floor to kerdi, “ “ “
Ditra to concrete slab, “ “ “

Will I be ok to use grey versabond for all bonds mentioned above?

Next question is about the sloped shower floor, a buddy of mine swears by using mason mix, by reading the post on the forum I do not think this is correct (already bought the mason mix). What are the disadvantages in using the Mason Mix? I would like to let him know so he does not make this mistake again.

How much sand topping mix and sand should I buy for a shower that is 39”X42” ? My Kerdi drain is sticking above the concrete slab 1”, and I figured that I will need 1.5” around the perimeter.

Sorry for so many questions, but I will sleep better of the next few weeks knowing that I am doing everything right. (so much time and money invested so far)

Thanks for having a forum like this to help the weekend dyi warriors.

Ben
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Old 04-07-2006, 08:33 PM   #2
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Hi Ben, welcome! You'll need a couple size trowels for your project. 3/16" v-notch for installing the Kerdi and for setting the 2x2's. 5/16" v-notch for setting the Ditra 3/8" for setting the tile on the Ditra. On the walls a 1/4" notch. The gray Versabond will be fine. You want to use sand mix for the floor because it's easier to slope. Mason mix has lime in it making it sticky and harder to slope.
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Old 04-08-2006, 07:23 AM   #3
ben74
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Thanks Mike, I found the material calc in the liberry. I do not need much for the shower floor. As far as the trowels, I have the 1\4" notch but will need to buy everything else today.

Also does anyone think I will have any problems with the mud floor being on 1.5 inches thick at the walls (1" at the drain) over a concrete slab? I am just worried that it might be to thin.

I am hoping to get a few pictures up before the weekend is over.


Thanks everyone.
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Old 04-08-2006, 08:56 AM   #4
bbcamp
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You can use a thinner mud bed over concrete. Before you dump in your mud, "paint" the concrete with some runny thinset. This will bond the new deck muc to the old concrete.
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Old 04-08-2006, 09:10 AM   #5
ben74
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Just went to 3 different stores to try to find the notched trowels, I picked up a 3/16 X 5/32 trowel for the kerdi to cbu. I was unable to find the others so I will order them online, any good sites I should look at? I also picked up 4 40# bags of sand topping mix and sand.
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Old 05-03-2006, 04:35 AM   #6
ben74
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Question on grout - I purchased a highly glazed tile (10X13) and used a 1/8 spacer. Should I use sanded or unsanded grout? I do not want to scratch the finish of the tile but want the best grout for the job. I need to grout areas inside and outside the shower. Thanks in advance for your advice.

Ben
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Old 05-11-2006, 03:54 PM   #7
ben74
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I am about to lay my Ditra on the basement slab but had one question:

After laying the Ditra is it necessary to fill in the grid pattern with thinset and wait to install the tile?

Or can I just use my 3/8 notched trowel over the ditra without prefilling the grid pattern with thinset?

Thanks

Ben
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Old 05-11-2006, 03:59 PM   #8
MarcusEngley
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You can do it either way Ben, but I found that it helped to pre-fill. Took the pressure off the tiling and allowed me to snap chalk-lines to follow.
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Old 05-11-2006, 04:30 PM   #9
jadnashua
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Either way, make sure to fill thinset into the locking lugs/towers spaces so you end up with firm support, then add more and use the notched side to lay your tile.
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Old 05-11-2006, 05:10 PM   #10
ben74
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Thanks so much for the quick responses. I have to post some pictures of the project. I have been working on it here and there for over 2 months. I started from scratch and cannot wait until I am finished.
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