At first I was thinking you might be able to slide multiple 1/4" diameter
rods and plates into the mortar joints if they are 1/4" or wider but
probably are not.
Finally, I agree with the anchors and plugs. The problem is that the
dutchman plugs will need to be from a new source because the material loss
from core drilling will be too great for filling in the holes later -
typically 1/4" all around so your cores are 1/2" diameter too small. Also,
the anchors should only be about 3/8"-1/2" diameter so you would not be
coring for these anyway. Generally, a glue line of more than 1/6" too big
visually and not good for adhesives or mortars. We did several hundred plug
dutchmans on the black granite at the Chrysler Building. You can see them
but they look okay. Better than unit replacement and cost a lot less too!
Eric Hammarberg
Interim 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: John Callan [mailto:[log in to unmask]]
Sent: Saturday, May 10, 2003 8:50 AM
To: [log in to unmask]
Subject: Re: Stuck on yuu
Mitch,
Ralph makes a great deal of sense. Its best to do damage that we know how to
repair with traditional building materials and methods, rather than
introducing new materials and new problems. But don't send the plugs to the
archives, keep them at the site. Try to keep a record of what you did at the
site. Maybe send a sample and a record to the archives, but let's face it,
when the time comes to plug the hole there will be a mason and he will do
what he thinks is best, without any research...unless there's an architect
running the show...in which case the mason will do what he thinks is best
without any research...or he'll do what the architect tells him, which will
have no research behind it, and the mason will be doing it just so he can
later say, "hey! I just did what the architect told me to do!"
-jc
On Friday, May 9, 2003, at 05:18 PM, Ralph Walter wrote:
In a message dated 5/9/2003 5:07:00 PM Eastern Daylight Time,
[log in to unmask] writes:
local granite - gneiss - capitol. A question has been raised regarding
adhesives and stone. The designers have been instructed not to drill into
the stone and are now looking at adhesives. Are there any adhesives which
could be used to attach
various various cameras and devices to stone and which could be cleaned up
at some date prehaps way in the futures with nary a trace? No, I didn't
think so. My view is to design the system so the stone would be not drilled
or glued at all and to limit attachments to more repairable plaster
surfaces.
Mitch,
Advise you try getting The Histo Presto Mafia to consider allowing the stone
to be drilled after all, on the theory that the holes can be plugged with
stone later. It may also buy the Histo Presto Mafia valuable brownie points
with the Security Police, who are likely to be a lot more powerful than a
bunch of old house huggers. Besides which, anything you mount in plaster is
subject to the plaster deteriorating.
Better yet, get the bolt holes cored into the stone, so that the cores can
be saved (of course the State Archives will save these 1/2" diameter stone
dowels forever, never break them, never throw them out, etc. etc) and
reinstalled (in epoxy!) just as soon as the cameras (that will be outdated
in 5 minutes) are removed because John Ashcroft has made the world safe for
Republicanism.
Uhhh...is this drilling being done into exposed interior plaster or exposed
exterior stone?
Ralph
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