True cavity wall construction is generally a post WWII technology. If the
building is 100-years old there may be a few voids but the collar joint
should mostly be filled with mortar. If you have a true cavity wall, I would
suspect problems or a unique condition. I suggest looking into it further.

Eric Hammarberg
Associate Director of Preservation
Associate
LZA Technology
641 Avenue of the Americas
New York, NY 10011-2014
Telephone: 917.661.8160 (Direct)
Mobile: 917.439.3537
Fax: 917.661.8161 (Direct)
email:  [log in to unmask]


-----Original Message-----
From: J.A. Drew Diaz [mailto:[log in to unmask]]
Sent: Thursday, November 14, 2002 11:34 AM
To: [log in to unmask]
Subject: Re: Cavity Wall Construction


Surveying a building in NYC- maybe 100 yrs old corner of 58th & Lex.
the client is convinced that the outside wythe is separating from the
inner double brick and in danger of collapsing on 58th St.
I explain that no that's just a cavity wall construction, that's how
it's done-
He asks why and I'm really not sure...
Why is it done that way???

Drew

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