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I have some crema marfil marble that was installed in Feb,

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and residue keeps forming on...
I have some crema marfil marble that was installed in Feb, and residue keeps forming on the tiles even after cleaning, any idea what is causing this?
Submitted: 2 years ago.Category: Home Improvement
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Answered in 15 minutes by:
5/4/2015
Home Improvement Expert: Rick, General Contractor replied 2 years ago
Rick
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Can you describe the residue?
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Customer reply replied 2 years ago
It seems to be dust like, hard to wipe off. It polishes off with marble dust.
Customer reply replied 2 years ago
I have a picture, how can I send that?
Home Improvement Expert: Rick, General Contractor replied 2 years ago
Is the marble set on a slab? or on a wood floor? if on a floor was it a mud job?
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Home Improvement Expert: Rick, General Contractor replied 2 years ago
I don't see anything except a shiny marble floor in the pic
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Customer reply replied 2 years ago
set on a slab, Merkrete 7000 anti fracture membrane
Customer reply replied 2 years ago
zoom in I cleaned 2 tiles in front of the door, look at the tiles directly above that.
Customer reply replied 2 years ago
they look like splotches in the reflective light
Customer reply replied 2 years ago
mud set
Home Improvement Expert: Rick, General Contractor replied 2 years ago
Since the floor has been in for a while it sounds like efflorescence. In most cases it will go away after a while. It's basically salts in the slab concrete an the mortar used to set the tile leaching out through the marble.
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Customer reply replied 2 years ago
are there any tests for this?
Customer reply replied 2 years ago
slab was poured over 16 months ago , still happening
Customer reply replied 2 years ago
stucco mix was used for the mud set.
Home Improvement Expert: Rick, General Contractor replied 2 years ago
No tests. Efflorescence is the only likely explanation. The slab may have been poured 16 months ago but the floor has only been there ~4 month.
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Customer reply replied 2 years ago
would the stucco mix be leaching the salt? Please confirm
Customer reply replied 2 years ago
any articles you can refer me to explain to my customer?
Home Improvement Expert: Rick, General Contractor replied 2 years ago
Most of the articles I know of you wouldn't want to give your customer because they say that the best way to avoid it is during the install. You could Google "efflorescence on marble flooring" and spend some time reading, looking for one that doesn't put the onus on the installer.
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