According to Susan M. Escherich's article on Gypsum Block and Tile in Twentieth Century Building Materials (a great resource), gypsum block loses compressive strength when saturated, but can regain it if it is allowed to dry out.
We can expect to find gypsum block on interiors as fireproofing for structural steel and as partition walls (as stated in earlier posts).
Generally, gypsum (as in Plaster of Paris) is not considered stable for exterior applications-- it degrades when wet (it is essentially water soluble) and produces soluble gypsum salts.
-Mary
-----Original Message-----
From: The listserv where the buildings do the talking [mailto:[log in to unmask]] On Behalf Of Dave Follett
Sent: Tuesday, January 26, 2010 11:14 AM
To: [log in to unmask]
Subject: Re: [BP] Should have built it with would
Well just going by free information on the internet... they don't make
it easy to find out whats even in Gypsum Paste besides Gypsum. I
wonder if its a "proprietary" thing by manufacturer, or if my surfing
skills are insufficient. Anyone know whats in this stuff?
On Tue, Jan 26, 2010 at 12:26 PM, <[log in to unmask]> wrote:
> In a message dated 1/26/2010 12:15:07 P.M. Eastern Standard Time,
> [log in to unmask] writes:
>
> But it's definitely a gut job to remove the gypsum blocks, which surely have
> absorbed a lot of moisture.
>
> Yeah, like, why is this, scientifically? Why would wetting/drying (or is it
> just wetting?) destroy the bond of all the little teeny tiny particles? And
> how did they stick together to begin with?
>
> c
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