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Unread 10-09-2007, 11:22 PM   #1
La_Floors
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Question about Ditra.........

Im thinking about using ditra instead of CB over a wood floor for tile im installing for a lady. My questions are: (1) Is it reliable? ive heard alot of people talk it up and im wondering if it is good as advertised? i absolutely do not want any problems down the road.
(2) After the ditra is installed, can you begin laying tile over it immidiately or does it need some dry time?
(3) Exactly how far off of the walls should it be cut for expansion.... 1/4 or 1/2?
Thanks in advance

Joseph
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Unread 10-10-2007, 06:07 AM   #2
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Anyone?
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Unread 10-10-2007, 06:49 AM   #3
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Hello Joseph,
I like DITRA plenty and I've just bought another full roll yesterday. Schluter is VERY good about providing instructional material on their website and as long as you follow those instructions you'll be fine. IF DITRA has one weakness, it's that you do need to wait longer before walking on the set tile because of the impermeability of the plastic layer prolonging cure time.
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Unread 10-10-2007, 06:50 AM   #4
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Joseph, that's one of the most discussed topics on these forums. If you'll type Ditra in the Advanced Search you'll get a weeks worth of reading. And the Schluter website has a world of information on correct installation of their products.

And if you've heard us "talk it up" here, you've already got the consesus opinion, eh?
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Unread 10-10-2007, 06:53 AM   #5
Brian in San Diego
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Joseph,

Provided all other requirements are met for installing tile, I think that Ditra is a superior product. Here're the advantages as I see them:
1. It is light weight. You can carry enough to cover 323 sqft. on one shoulder.
2. It is easy to cut. Razor knife and scissors are all you need.
3. Easy to put down. Spread and comb a layer of thinset and imbed the Ditra in it. No screws required.
4. Much cleaner than a CBU.

The diasadvantage...
1. You use a lot more thinset. (To fill the "waffles")

You can lay tile immediately after installation. I keep it 1/4" away from immoveable objects. Can't think of any problems you'd have down the road as long as you've installed it properly. When imbedding the ditra in the thinset, I always pull back a section to make sure I'm getting 100% coverage.

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Unread 10-10-2007, 07:00 AM   #6
Bellsfloors
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Joseph,

Go for it. I have been installing Ditra for over 5 years now with absolutley no problems or failures. Just follow the directions to a T. Use modified under on clean Wood substrate and unmodified mortar on Concrete. Pick a good quality unmodified to install tile on top of the Ditra. Bostik/Hydroment now has a endorsed thinset call D-25 Ditraset I am trying and so far I like it. May not be readily availible in your area so just don't pick the cheapest since quality does make a difference.

Big thing to remember is that it is an impervious membrane so it will take a little longer to cure. Also I always wait 24 hours minimum before installing tile so to prevent lifting of the Ditra if I should need to pull up a tile for any reason to properly set. You don't want to seperate the Ditra from fresh thinset otherwise you will need to cut it out and put down fresh mortar.

I ussually cut close but leave a 1/8" gap between any adjacent surfaces. I understand it is not required but I do it anyway. But always leave expansion for the tile.
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Unread 10-10-2007, 07:12 AM   #7
La_Floors
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Thanks to those that answered my questions ..im fixing to give it a shot. Did i mention that this is the best forum that i have ever visited?
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Unread 10-10-2007, 06:42 PM   #8
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I have some updated questions that worry me. Well my helper and i installed all of the ditra today ( 600 square ft. ) after we installed about half we went to lunch. When we got back we were informed that other contractors were walking on the ditra while we were gone. Later this evening i noticed that a couple of places were loose from the subfloor so i stacked a box of tile on each spot to hold it down.
I assume its ok to walk on the ditra after its installed because the directions said you could start laying tile immidiately after the ditra is down.
Is this a common thing or something to be worried about? I dont know if they broke it loose by walking on it or what. This is my first experience with ditra so id appreciate a few opinions on this matter.
Thanks
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Unread 10-10-2007, 06:49 PM   #9
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Hi Joseph,

Since you're apparently a pro I'm going to move you to the Pro Hangout.

I don't know whether the other tradesmen could have kicked the stuff loose or not. See what's going on in the morning. You can cut out the loose areas with a razor knife and re-thin set them. Doesn't matter how many joints you have in the Ditra.
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Unread 10-10-2007, 07:07 PM   #10
La_Floors
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I know that ditra is designed to cut loose from the subfloor from movement. Common sense would tell me that it eventually will be a floating tile floor anyhow. If it works like they say then i wouldnt think it was a big deal,like i said,this is my first experience with it and i want to get it right,i owe that to the customers. Thanks.
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Unread 10-10-2007, 07:13 PM   #11
T_Hulse
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You don't want anything floating. If it's loose, cut it out and redo it like John said. Usually just walking across it isn't a problem while it's setting up.
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Unread 10-10-2007, 07:19 PM   #12
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I'll have to concur with everyone here. I'm finally catching up on all the work I had booked thru the summer and about ready to get deeper in the tile business. Since going to the tile school I doubt I ever buy another piece of CBU...nothing but ditra & kerdi. I'm definitely sold on the stuff.
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Unread 10-10-2007, 07:23 PM   #13
La_Floors
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Thanks Tom.
Do you have any idea what would have caused it to come loose? it was getting a good transfer . If it wasnt from walking on it the only other thing i can think of is that the woman had the AC rolling pretty good.
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Unread 10-10-2007, 07:30 PM   #14
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Hi Joseph, I use Ditra alla time. I have noticed if the house is cool the mud will take longer to dry under the Ditra.
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Unread 10-10-2007, 07:40 PM   #15
La_Floors
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Evening Mike.
The ditra acted like it was stuck good at first . Later it started bubblin in areas that were previously laid ( maybe an hour or two later ) . I dont think it was caused by being walked on it because the instructions say you can tile over it right after its laid. Maybe the AC is the culprit.
Have you ever had it bubble on you before? if so was it stuck down the next morning after it was completely dryed?
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