[MassHistPres] insulating/sealing of sash weight channels

[wwheelwright at juno.com]

Can someone speak to the issue or direct me to a website that can make
recommendations and discuss alternatives for the insulating of the sash
weight channels on double hung windows?  And make recommendations as to
removal of the weights and replacing them with jamb liners?  These
windows are circa 1950 with two weights on two pulleys.    The interior
trim has been removed so there is access to the weights and channels. 
There is approx. 1.5 inches of unused clearance between the weights and
the trim that could accomodate insualtion, such as rigid foam and a
sealant. I've searched my listserve files on window renovation and can't
find anything that speaks specifically to this issue. Thanks.
Susie Wheelwright
Sherborn Historical Commission
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