A few questions for you then some of my comments.

What is significant about the windows? What are the significant attributes
of the windows? What age are the windows? Building? What repairs are
reversible?
Your answers should help guide you through the following morass.

1.  None - the windows would have leaked at the time
of construction, and hence the leaking is significant. -- Most buildings
need to function and service the tenants in a livable environment.

2.  Application of a sealant bead around the perimeter
of the sash to frame junction, thus preventing the
operation of the sashes. -- Sounds worth considering if opening the sashes
is not important or significant.

3.  Modification of the framing members by addition of
new beads containing gaskets to provide an internal
air seal. -- Not sure I understand enough but sounds worth considering. What
kind of modifications are necessary?

4.  Installation of a second line of glazing on the
inside of the windows to provide the primary
waterproofing and air infiltration seal. -- If the windows leak air and
water this would not be a good idea. Water will accumulate behind the
exterior windows and allow water within wall section. This is not a good
idea.

How about exterior overglazing?


Eric Hammarberg
Associate Director of Preservation
Senior Project Director
LZA Technology
641 Avenue of the Americas
New York, NY 10011-2014
Telephone: 212.741.1300 extension: 1016
Mobile: 917.439.3537
Fax: 212.989.2040
email:  [log in to unmask]


-----Original Message-----
From: david west [mailto:[log in to unmask]]
Sent: Thursday, May 24, 2001 5:12 PM
To: [log in to unmask]
Subject: A poll on the philosophy of intervention


A question on philosophy.

If I have double hung aluminium framed windows which
are significant fabric, and contribute to the
significance of the building, how much intervention is
acceptable to stop any leaks?

1.  None - the windows would have leaked at the time
of construction, and hence the leaking is significant.

2.  Application of a sealant bead around the perimeter
of the sash to frame junction, thus preventing the
operation of the sashes.

3.  Modification of the framing members by addition of
new beads containing gaskets to provide an internal
air seal.

4.  Installation of a second line of glazing on the
inside of the windows to provide the primary
waterproofing and air infiltration seal.

All insights would be appreciated.
All insights will be acknowledged.

david

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