You can also observe from cracking whether cracks are due to typical
stone stress fractures, or associated with a buried but corroding steel
reinforcing bar. 





QUINN EVANS | ARCHITECTS

Ilene R. Tyler, FAIA, FAPT

219 1/2 N. Main Street
Ann Arbor, MI  48104
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www.quinnevans.com
v 734.663.5888
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----------------------------------------------------------------------

Date:    Mon, 20 Jun 2005 09:56:44 -0400
From:    "Judith E. Selwyn" <[log in to unmask]>
Subject: Re: ID Cast Stone vs natural?

The simple answer is yes.  Sometimes it takes a second glance.  Most of
the thirties stuff was made to look like limestone.  In unweathered
(sheltered) areas it almost always develops a yellow cast and some black
crusting.  In exposed areas, it gets more aggregate exposed.


Dr. Judith E. Selwyn
Preservation Technology Associates, Inc.
2 Center Plaza, Suite 400
Boston, MA 02108

617 598-2255
fax 617 227-5535
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----- Original Message -----
From: "John Callan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, June 19, 2005 2:34 PM
Subject: [BP] ID Cast Stone vs natural?


> Are there any readily observable differences between good 1930's cast 
> stone and natural stone?
>
> -jc
>

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