I believe the material originally matched but as we had discussed a while back on pinheads, concrete holds dirt, probably much more that glazed terra cotta and it would be very difficult to develop a color in anticipation of how much dirt it would collect. Best to ask Theo or Tim Allenbrook (he is with Wiss Janney now).
 
I'm sure accelerated age testing has been done on fiberglass but it greatly depends on the quality of fabrication and installation.
 

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]

 

From: The Listserv that makes holes in Manhattan schist for free! [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Monday, June 04, 2007 2:04 PM
To: [log in to unmask]
Subject: Re: [BP] Gothic building - terra cotta substitute - color change

In a message dated 6/4/2007 1:37:11 PM Eastern Daylight Time, [log in to unmask] writes:
I believe they are replacement units of precast concrete (or cast stone), not terra cotta. Concrete does not weather like glazed terra cotta.
The presumption is that Theo or Jim Fitch or whoever originally installed material in matching colors.  But that prediction has proved faulty, perhaps because there was little history in this ... application(!)*  Does that sound right?
 
More recently, have there been aging tests on fiberglass cornices, GFRC, etc?  Or are we still flying blind? 
 
Christopher
 
*And, a tip o' the Hatlo hat to Steve St. 



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