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Old 02-18-2011, 09:35 PM   #1
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schluter ditra


Hi-We're wanting to put down a tile floor in the bathroom where there's been vinyl. I'm steering away from the cement backer board because of the height difference it'll cause after we have the backer board with the tile next to existing bedroom carpeting. I'm looking at the Schluter Ditra 1/8" as an alternative to the cement backer board. Does anyone know if it's all that it says it is? Can we lay this right over plywood and have the support we need?
By the way, we have trusses that are 24" on center and are 16" deep. We did put some support boards perpendicular to the trusses underneath to give more stable support to the floor to be able to support the tile.
Any opinions?'
Thanks - Cathy
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Old 02-18-2011, 09:52 PM   #2
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schluter ditra


well generally with 24 inch spacing you add another lay of plywood to give 1 and 1/8th total deck thickness. ditra is good. lay it with modifed thinset and set your tile with non modified and make sure you vacuum the floor and wipe it with a damp sponge to get the remainer of the dust off before laying the ditra. if you have a lot of blocks and they are turned flat it will be ok for ceramic but i would not lay travertine like that, but ditra will not honor their warranty with blocks and no second layer of plywood. on a small bathroom it will be fine. big open floor, no add the plywood
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Old 02-19-2011, 11:23 AM   #3
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schluter ditra


Go to:
http://www.diychatroom.com/f84/
for more specific flooring advice (very good place!).
Neither Ditra nor CBU will significantly prevent floor flexing movements (up and down). How thick is the subfloor and what material is it?
The concern is that the floor will flex between the joists and over time it will crack tile or grout if it is not significantly strong enough (read thick).
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Old 02-20-2011, 06:54 PM   #4
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schluter ditra


thanks so much for your responses! We are actually wanting to tile the floor in two bathrooms that are back-to-back. The flooring in both is 3/4" plywood. The bathrooms are relatively small. The floor size of bathroom #1 is 5' x 4.5'. (So we're talking 22.5 sq. ft. This will have a pedestal sink on the tile.) The second bathroom will call for approx. 32 sq. ft. of tile once you subtract the area under the vanity.
As I mentioned, we added support 2x4's perpendicular to the trusses underneath the floor of bathroom #2 so the floor would be more stable.
What do you think? thanks so much.
also, thanks for the advice, bob22, as to where to go on the site to even look at similar questions.
And can I ask one more question? We weren't thinking of using travertine tile, just ceramic/ porcelain. Is the reason you didn't recommend travertine is because of the weight?
thanks!
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Old 02-20-2011, 08:58 PM   #5
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natural stone requires a much stiffer floor that ceramic the travertine will break if there is any flex in the floor
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