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Old 12-06-2017, 07:22 PM   #1
Superman07
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Powder Room Floor

Good evening,
You all helped me tackled our master bath a few years ago. While Im sad to say I eventually threw in the towel and called somebody in to finish the project, it was a good learning experience.

Im now gearing up to tackle redoing our small downstairs bathroom floor. Probably something I should have start with originally!

Weve purchased some 2 mosaic polished marble.

My plan is as follows:

1) pull up existing floor and tile trim
2) ensure subfloor is in good shape and clean
3) apply Schluter Ditra (modified thinset)
4) apply tile (unmodified thinset)
5) seal tile
6) grout
7) seal

Is that the correct thinset choice for the Ditra/subfloor and Ditra/tile installation?

Id also like to confirm, per Schluter website, that tile can be applied immediately to Ditra without letting the modified thinset cure.

Any other recommendations or watch out for?

Thank you,
David


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Old 12-06-2017, 07:49 PM   #2
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1,2. Evaluate existing joist structure and subflooring to ensure meeting the requirements for a natural stone tile installation. Very unlikely unless natural stone was specified when the structure was built. Joist deflection should not exceed L/720 and two layers of subflooring must be properly and differently installed to meet such standards.

3. Must be a modified thinset mortar meeting ANSI A118.11.

My opinion; worth price charged.
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Old 12-08-2017, 07:41 AM   #3
Superman07
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Well thats very unwelcome news. Im not sure how Ill be able to determine that. The room does about against our neighbors and the hvac room is directly below it. Would those wall structures help with deflection? If not, what would the easiest solution be? Adding a layer of subfloor or removing subfloor to access joists (not something I think I want to do.

After a quick measure I seem to have at least 1/2 room from top of existing tile to the transition to play with.


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Old 12-08-2017, 10:30 AM   #4
John Bridge
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Hi David,

My opinion:

Since you're using 2x2 tiles I don't think I'd worry about meeting the requirements for a stone floor. And since it's only a small job I think your stated plan will work.

Although Schluter says you can get on the Ditra right after it's laid I don't recommend it. Doing that causes the thinset underneath to dis-form and create high spots. Wait until the next day.
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