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Brian, Architect
Category: Home Improvement
Satisfied Customers: 2153
Experience:  Licensed Architect- 17 years, L.E.E.D. AP
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I have some crema marfil marble that was installed in Feb,

Customer Question

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: 1 year ago.
Category: Home Improvement
Expert:  Rick replied 1 year ago.
Can you describe the residue?
Customer: replied 1 year ago.
It seems to be dust like, hard to wipe off. It polishes off with marble dust.
Customer: replied 1 year ago.
I have a picture, how can I send that?
Expert:  Rick replied 1 year ago.
Is the marble set on a slab? or on a wood floor? if on a floor was it a mud job?
Customer: replied 1 year ago.
picture coming
Expert:  Rick replied 1 year ago.
I don't see anything except a shiny marble floor in the pic
Customer: replied 1 year ago.
set on a slab, Merkrete 7000 anti fracture membrane
Customer: replied 1 year ago.
zoom in I cleaned 2 tiles in front of the door, look at the tiles directly above that.
Customer: replied 1 year ago.
they look like splotches in the reflective light
Customer: replied 1 year ago.
mud set
Expert:  Rick replied 1 year 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.
Customer: replied 1 year ago.
are there any tests for this?
Customer: replied 1 year ago.
slab was poured over 16 months ago , still happening
Customer: replied 1 year ago.
stucco mix was used for the mud set.
Expert:  Rick replied 1 year 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.
Customer: replied 1 year ago.
would the stucco mix be leaching the salt? Please confirm
Customer: replied 1 year ago.
any articles you can refer me to explain to my customer?
Expert:  Rick replied 1 year 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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