Its my understanding that Gypsum based products are not more or less
likely to grow mold then other chemically neutral surfaces, but that
while lime plaster has a high pH level is actively discourages mold
growth. Gypsum from what i can tell seems to be pretty close to
neutral, and when it gets wet it holds moisture... all mold needs is
moisture and a neutral environment. A quick Google astral projection
seems to indicate several manufacturers saying that without the paper
that Gypsum does not grow mold... unless you get it wet.
On Tue, Jan 26, 2010 at 1:15 PM, Rudy R Christian <[log in to unmask]> wrote:
> Eric,
>
> When we were in the Holy Cross neighborhood after Katrina I did an
> assessment of a house which was about to be gutted. Fortunately we saved
> that one, but it did have a peculiar condition on the bedroom walls. They
> appeared to be lime based plaster like the rest of the house (and most of
> the unremuddled properties there) but they were exhibiting mold growth at
> the waterline. My trusty pocket knife revealed that a gypsum veneer
> (probably Lowes drywall compound) had been applied to the plaster surface
> and the mold was in the veneer. As you suggest, the paper is usually what
> usually supports the mold, put it appears there must be an additive in the
> compound that did too.
>
> Rudy
>
>
> -----Original Message-----
> From: The listserv where the buildings do the talking
> [mailto:[log in to unmask]] On Behalf Of Hammarberg,
> Eric
> Sent: Tuesday, January 26, 2010 1:01 PM
> To: [log in to unmask]
> Subject: Re: [BP] Should have built it with wood
>
> Actually the mold grows on the sheetrock paper facing (food source), not the
> gypsum
>
> Eric Hammarberg, Assoc. AIA
> Vice President
> Thornton Tomasetti
> 51 Madison Avenue
> New York, NY 10010
> T 917.661.7800 F 917.661.7801
> D 917.661.8160
> [log in to unmask]
> www.ThorntonTomasetti.com
>
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