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Unread 05-24-2009, 10:42 PM   #1
dcatoni
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First time tiler, subfloor, and Ditra

I was about to tile my bathroom floor and luckily I found this site. Within a few weeks of buying my 1935 house all the tiles started popping and the grout came out.

Here is what I had to start with from the bottom up:

1.75" X 8.5" joists 16" on center 13' span
3/4" 7" boards perpendicular to joists
1/2" 7" boards parallel to joists
3/16" plywood
thinset and ceramic tile

Here is what I have done so far:
I used the Deflecto and found my floor to be inadequate for the porcelain tile I want to install. So, I spent today sistering one 13' 2X8 to each joist under the bathroom. I used Liquid Nails and 1/2" carriage bolts every foot staggered in an up and down pattern. The existing joists are in very good condition and were nearly perfectly level. I also pulled up all the tile (easily by hand), and some of the plywood.

Here is my plan:
Tear out everything except the bottom 3/4" layer. Screw that layer into the joists with 1 5/8" Deckmate screws. Add a layer of 11/32" plytanium BC screwed to the bottom layer with the deck screws. Then Ditra and tile. The tile is 3/8" thick and the hardwoods outside of the bathroom are exactly 1.5" high from the joists. I want to do this right and have a nice transition.

Basically, my question is, should I go ahead with that plan or do it differently? Also, I just learned about Ditra on this forum so I tried to get more info, but the Schluter website hasn't worked for me all weekend. Does anyone have their technical info in a .PDF?

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Unread 05-25-2009, 07:27 AM   #2
Brian in San Diego
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Dante,

Welcome to the forum! One thing I see wrong with your plan is the thickness of the plywood you want to use. I would use nothing less than 1/2" (15/32") and would prefer 19/32". There are other ways to deal with the transition. You described sistering a joist...did you do only one? I think you'll need to sister the other joists in the bathroom.

The Ditra installation handbook can be found in the Liberry.

Brian
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Unread 05-25-2009, 07:55 AM   #3
dcatoni
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I did every joist under the bathroom. I thought a Liberry was a type of fruit.

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Unread 05-25-2009, 07:58 AM   #4
Brian in San Diego
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Incidentally, when I click on the Schluter Systems link in the Sponsor's column on the right side of the page it opens their website.
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Unread 05-25-2009, 09:50 AM   #5
dcatoni
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About how thick should the mortar be under and over the the Ditra?

3/4" planks
15/32" plywood
1/8" Ditra
3/8" tile
Gives me a height difference of 7/32" plus mortar. If the mortar is 1/4" wouldn't the transition be to high? If I start from the joists I would be able to use 3/4" ply alone right? It looks difficult to remove the whole subfloor, but I will if I have to.

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Unread 05-28-2009, 07:58 PM   #6
dcatoni
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So I think I'm going to put 15/32 ply over my 3/4 planks. Does this floor look good enough? Should I be worried about those planks that are split?

http://s107.photobucket.com/albums/m...t=IMG_2893.jpg

http://s107.photobucket.com/albums/m...t=IMG_2894.jpg

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Unread 05-28-2009, 08:56 PM   #7
Rob Z
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Hi Dante,

It's hard to say for sure w/o being there, but after working in a lot of old houses that had 1x subflooring...my opinion is that you should overlay it with the thickest plywood you can stand prior to installing the Ditra. I personally would want to use 3/4" (T&G if I could get it in there and get it to lock together), and no less than 5/8".

We usually separate the 1x from the ply with roofing paper to eliminate squeaks.
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Unread 05-30-2009, 06:57 AM   #8
dcatoni
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The Schluter website isn't working again. Is it just me or do they shut down their website on weekends?
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Unread 05-30-2009, 07:02 AM   #9
Brian in San Diego
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Not working for me either. Some of the information you may be looking for is available on this site and some of the videos are posted on YouTube.
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