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Old 05-14-2004, 09:07 AM   #1
floandpete
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How soon after installing tiles in thinset can you grout tiles?

How soon after setting tiles in thinset, can you grout? How long does thinset take to dry?
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Old 05-14-2004, 09:33 AM   #2
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It depends. If you set your tiles on concrete or backerboard, wait about 24 hours. If you are using porcelain tiles with modified thinset over Ditra, wait a week or more.

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Old 05-14-2004, 10:53 AM   #3
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What if you are using porcelain tiles and modified thinset over CBU that has been waterproofed with redgard? Should you wait a week? (Seems like this situation is the same as the Ditra case: water has nowhere to go.)

What if you are using porcelain tiles and modified thinset over CBU that has a sheet of plastic behind it? The plastic will stop water vapor. Seems like you should still need to wait a long time.
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Old 05-14-2004, 11:24 AM   #4
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Good points Adrian.

Yes and yes to your scenarios.

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Old 05-14-2004, 12:07 PM   #5
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If you do not have the luxury of time, I recommend a fast setting mortar. Many of these can be grouted in 3-4 hours. Maybe add a little time for special circumstances, but you are still way ahead in time. I set glass tile (impervious) over waterprofing in my kitchen with Grani Rapid and the stuff could not be moved after 3 hours. Grout away!
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Old 05-14-2004, 12:10 PM   #6
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Most newbies and DIYers don't need the extra stress of using rapid-set anything in their tile jobs.
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Old 05-14-2004, 12:25 PM   #7
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...very true. But who doesn't need a solid bucket of concrete sitting around the house? You didn't think of that did you? =P
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Old 05-14-2004, 01:34 PM   #8
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Hey Bob, wachewtalkingbout? I use rapid-set all the time. Measure it out with tablespoons, mix it up in dixie cups, stir it up with pop-sickle sticks, slap it on wift my finger, wipe it off on my pants while sippin a beer all at the same time. Way cool man. No stress at all. Git in the grouve now.

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Old 05-17-2004, 12:13 AM   #9
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Old 05-17-2004, 12:22 AM   #10
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Using Ditra or not

Bob - Do you recommend using Ditra for a bathroom floor - or is Cement board / electric heat mat / porcelain tile OK with out it?
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Old 05-17-2004, 12:44 AM   #11
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You have to balance a number of issues when you specify building products: cost, availibility, ease of application, physical and structural limits, etc. For most DIYers, backerboard is readily available and easy enough to understand, so most of the time, it is the recommended method. We use Ditra to solve problems, such as joist spacing greater than 16 inches or height differences with adjoining rooms. That is not to say that Ditra shouldn't be the first choice, nor is it to say that a backerboard floor is inferior. Each has it's place in the toolkit.

Do you have your own thread started about your floor?
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