Window Insulation for 100 year old glass


A friend of my mine owns a century old victorian that still has much of the original glass. The glass has actually sagged so the bottom is thicker than the top. She feels that the they have historical value and doesn't want to tamper too much with the house as it is worth about 900k. Any suggestions *other* than cheap plastic to improve the insulation window performance?
Thanks in advance.
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SoCal wrote:

How about "expensive" plastic?
Make removable inside storms using plexiglass. Another notch up and get real glass insiders.
Jim
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TOH show had a company that installs new jams that seal around and lock more securely.
Exterior storms although inconvenient were used in historic district
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While a common belief, it's almost certainly not true that the thickness difference at the bottom is owing to glass "sagging" from age...see the following
http://www.sciencenews.org/pages/sn_arc98/5_30_98/fob3.htm
That piece of trivia aside, I commend the thought of not desecrating a possibly historic house both from the possible financial ramifications but moreso even from the simply "it's the right thing" to do standpoint.
I'd investigate what is apropos for the specific area and house and go that route. As someone else noted, external storms are certainly not unheard of. If the house is in a conservation district, they undoubtedly have guidelines -- if not, restricted, even so it is likely they will be happy to point you in reasonable directions.
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Another spot to read about 'glass flow' is the urban legends newsgroup- alt.folklore.urban It's in their FAQ- http://groups.google.com/group/alt.folklore.urban/browse_frm/thread/106e1dd0e2a01f4c/c428d10c3c5b07fc?lnk=st&q=&rnum=1#c428d10c3c5b07fc

She can buy expensive plastic. In the 70's, when oil was expensive, there were a million businesses that installed 'inside storms' - basically a plastic/lexan with magnetic edges which stuck to the thin magnets they installed on the inside. It gave an invisible third pane that went up and down easily, and stored easily.
There must still be some of these businesses around. [and if there aren't, it isn't brain surgery to do it yourself]
Jim
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