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Old 06-13-2008, 10:44 PM   #1
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"Frost" appearing on wall in basement


I would describe this as a sub-basment as it is two levels below the street. It has been dormant for 15 years w/o dehumidifiers, etc. There is a brick wall set apart from the actual wall (angled and waved for effect...recording studio) that we bleached and power washed. Before doing so there was a snow/frost like substance on the wall in a small patches. We washed, it disappeared and then tonight it appears to have reformed. My step-mom thinks it might be condensation depositing minerals (though it would have moved quite quickly back into place) but outside of that we're stumped. Mold? Micro-organism? Has anyone else encountered this "basement snow" and do they know how to get rid of it? I wanna record but things are a little too "science lab" to bring musicians into.

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Old 06-13-2008, 11:26 PM   #2
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"Frost" appearing on wall in basement


Get a dehumidifier working down there. I imagine it is mold. Spray the walls with a solution of bleach and water, scrub, and wash.

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Old 06-14-2008, 08:02 AM   #3
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"Frost" appearing on wall in basement


You've got yourself some mold. You'll have to bleach it out just like he said, then get it dry. You may wanna paint it with hydrostatic paint once you've cleaned and dried it out.
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Old 06-14-2008, 11:58 PM   #4
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"Frost" appearing on wall in basement


You probably have what is called efflorescence. It is a mineral deposit left behind from water that has seeped into your wall.

It is not mold. I would imagine that you would have to correct the source of the water leakage.
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Old 06-15-2008, 07:05 AM   #5
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"Frost" appearing on wall in basement


the last i heard, there were over 10,000 different strains of mold - this is from mole remediation ' experts ' ( in-house salesmen ) so temper that fact w/your own skepticism,,, clorox/wtr rinses worked for us &, if they didn't, light muriatic/wtr did,,, ' efflorescence ' forms as a salt ( calcium carbonate ) & can be brushed to the floor & swept up.

both need moisture to reoccur,,, never heard of ' hydrostatic paint ' but did google this - http://www.freepatentsonline.com/4219157.html ,,, suspect the poster may've been thinking drylok etc instead,,, my 10yrs experience isn't good w/that family of products negative side below-grade.
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Old 06-15-2008, 07:06 AM   #6
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"Frost" appearing on wall in basement


the last i heard, there were over 10,000 different strains of mold - this is from mold remediation ' experts ' ( in-house salesmen ) so temper that fact w/your own skepticism,,, clorox/wtr rinses worked for us &, if they didn't, light muriatic/wtr did,,, ' efflorescence ' forms as a salt ( calcium carbonate ) & can be brushed to the floor & swept up.

both need moisture to reoccur,,, never heard of ' hydrostatic paint ' but did google this - http://www.freepatentsonline.com/4219157.html ,,, suspect the poster may've been thinking drylok etc instead,,, my 10yrs experience isn't good w/that family of products negative side below-grade.
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Old 06-15-2008, 08:09 AM   #7
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"Frost" appearing on wall in basement


I very much doubt from the description of the problem given that you have a problem with mould but efflorescence which is the occurance of surface salts from the building structure caused by dampness. I would suggest you look at a publication on efflorescence at http://www.buildit.org.uk/publications.htm it describes your problem and the advises on remedial action required.
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Old 06-15-2008, 09:33 PM   #8
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"Frost" appearing on wall in basement


If it's fuzzy, it's mold. If it looks like white chalk, it's efflorescence. Either way, you can clean it and apply some of that drylock paint to hold it back. If it's mold though, it will probably grow on top of the paint too. So I'd look into dehumidifying after you paint.
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Old 06-15-2008, 10:58 PM   #9
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"Frost" appearing on wall in basement


Quote:
Originally Posted by jayp View Post
If it's fuzzy, it's mold. If it looks like white chalk, it's efflorescence. Either way, you can clean it and apply some of that drylock paint to hold it back. If it's mold though, it will probably grow on top of the paint too. So I'd look into dehumidifying after you paint.
Not all fuzziness is mold.
You can test to see if it mold by putting it in water. If it disappears its not mold, if it hangs in the water and you can see it, its mold.

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