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Old 07-12-2010, 06:44 PM   #1
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electric mat, ditra floor

Hey all,

I've just finished deck mudding a 35 sq ft bathroom floor. I just want to confirm that the steps I have planned next are not a mistake:

1- felt (done)
2- galvanized lath nailed down 6" field, 4" edges (done)
3- Mud 1", 1 portland: 5 sand (done)

4- electric mat placed
5- level over with modified thinset (let dry)
6- apply modified thinset with v-notched trowel, place ditra (let dry)
7- apply/fill ditra with unmodified thinset, then apply more with notched trowel for setting of tile.

Did I miss something or do something wrong?

Also, why is it recommended that unmodified go between ditra and tile?

Thanks in advance!


Last edited by zantar; 07-12-2010 at 06:47 PM.
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Old 08-21-2010, 08:52 AM   #2
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UNmodified thinset does not need air to harden, and there won't be much between the membrane and a large ceramic tile.


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Old 08-22-2010, 11:23 AM   #3
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You are installing Ditra over another cementitious product. Generally the guidelines call for Unmodified under Ditra when going over a cementitious substrate. Modified should be for setting it to wood only.
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