I have heard of similar mortars but no firsthand experience.
Hey, what ASTM does this comply with?
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
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-----Original Message-----
From: The listserv that doubts.
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Sent: Wednesday, September 05, 2007 11:27 AM
To: [log in to unmask]
Subject: [BP] Another mortar
Have just had a pointing mortar from a NYC mid-C19 manufacturing loft
building analysed. I thought it might be lime putty pigmented with brick
dust.
Turns out to be chalk (+/-90%), an organic binder, probably animal glue (+/-
5%) and a red mineral pigment, likely red ochre, and traces of silaca dust.
Like a distemper paint but very heavy on the solids.
It was used in the brownstone section of the facade, where the joints were
fine. The brownstone arrises were in very good shape. Much of the mortar was
firmly in place, although it was easy to scrape out, as crumbs. I did not
investigate the bedding mortar which was about an inch back and clearly
harder and not pigmented, as one would expect.
Am interested to know whether any of you have come across this mix and have
tried to imitate it. It would be very breathable and has a good bright
color.
Christopher Tavener
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