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Old 01-19-2010, 08:21 PM   #1
chuckorr
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Metal Lath vs ditra

I have been researching the pros and cons on using metal lath or an uncoupling membrane(i.e. ditra, provaflex). I cannot seem to find a difinitive answer. I'm installing marble tile and have a 3/4" height problem to match a wood floor. Any advice would be welcomed. Thanks Chuck.
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Old 01-19-2010, 08:26 PM   #2
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Chuck, the lath installation is only good if you have a mud bed over it. About the thinest you can go with the mud is 3/4 in a small area. Going by the book you need 1 1/4 mud.
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Old 01-19-2010, 10:40 PM   #3
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Is this over concrete or a wood framed floor?
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Old 01-19-2010, 11:29 PM   #4
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Welcome to the forum, Chuck.

Davy's one of the more experienced mud guys around and has ya covered there. Sounds like you don't have enough height available to use mud, so let's find out more details about your subfloor/slab like Brannigan is asking. Natural stone is weaker than man-made tiles and has beefier subfloor/joist structure requirements. Hopefully this is a slab.
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Old 01-20-2010, 04:38 PM   #5
chuckorr
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Metal Lath vs ditra

Thanks for the response. What I have is 3/4" in sub floor on 16" center and am trying to match the adjoining 3/4" wood floor. I have an area of obout 130Sq. FT. to cover in the bath.
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Old 01-20-2010, 06:20 PM   #6
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Add another layer of 1/2" plywood installed like this: http://www.tile-assn.com/tileletter/...oeste-0604.pdf

Also, what results did you get when you plugged your joists size and span intot he Deflecto tool above? As mentioned above, you need a stiffer floor for stone than you do for porcelain.
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Old 01-20-2010, 06:35 PM   #7
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metal lath vs ditra

Thanks again for the response. One last question, does the suggested thickness apply to the Ditra product?
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Old 01-22-2010, 12:21 AM   #8
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Yes. Because of the natural stone tile you want to use, I'd add another layer of 1/2" installed per the link Brannigan gave you...and use Ditra.

Because you are limited on height, you might consider using a man-made tile that would allow you to avoid that second layer of plywood. A second layer, properly installed, is nearly always a good thing...but with man-made tiles, you can avoid it if you like (assuming the ply is in great shape and properly installed). Now, based on the assumption that the marble you're considering installing is polished, you may want to consider a polished porcelain tile as a substitute. I've seen some very good looking polished porcelain that may appeal to you. Using Ditra XL directly over the subfloor would get you pretty close to that 3/4" height you're desiring.
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