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Unread 08-12-2012, 12:51 PM   #1
mbdreaux
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Mortar float over cement slab

I always do mortar floats over wood subfloors, and so just nail the metal lathe to the subfloor with galvanized roofing nails. Now I'm looking at a small, cement slab, bathroom floor, (approx. 20 sq ft) where there is a significant dip where the toilet flange is located. Thinking about floating the floor, but how to get the metal lathe to lay flat? Ideas mud people?

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Unread 08-12-2012, 02:09 PM   #2
cx
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Welcome, Maia.

You would not use metal lath in that mud application.

Your choices are to do a bonded mud bed, in which you apply a slurry of bonding mortar consisting of thinset mortar or pure Portland cement before placing a minimum of 3/4" of deck mud, or you put down a cleavage membrane and place a minimum of 1 1/4" of deck mud with reinforcing mesh (not metal lath) in the vertical center of the mud.
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Unread 08-12-2012, 07:08 PM   #3
mbdreaux
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Hi CX,

Thanks for the response! So, a "reinforcing mesh"? Do you mean like a crack isolation membrane? Or more like a fiberglass mesh screen?
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Unread 08-12-2012, 07:26 PM   #4
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I think Kelly is talking about welded wire, like in this pic.
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Unread 08-13-2012, 03:28 PM   #5
mbdreaux
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Aha. Yes, Thank you!
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