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Posts Tagged ‘thermopanes’

Old windows are so worth saving and so much a part of a house’s style and character.

Unfortunately, many old houses have lost their windows after manufacturers claimed thermopaned windows offered such superior

Wood planing the bottom edge of the storm window

Wood planing the bottom edge of the storm window

energy effeciency. Civil engineers from the University of Vermont, The Vermont Energy Investment Corp., and the U.S. Army Cold Regions Research and Engineering Laboratory (James et. al, 1996) presented evidence that the savings of removing old windows and replacing with thermopanes is so small, that it may take over 80 years to recoup the investment – longer if the original windows are properly maintained. A well-maintained original wood sash or casement window with storm window offers many other advantages, including the ability to abate a larger amount of ambient and street noise due to the larger distance between each pane. Original windows will also last a lifetime if properly maintained. This justifies repairing the existing window when needed. Sedovic and Gottheif’s report (at traditional-building.com) addresses many of the overblown claims made by replacement window manufacturers and the advantages of well maintained historic windows.

There are also security issues with “vinyl” windows, since they are not as strong as wood frames. Vinyl framed windows cannot normally be painted

Brass fastener

Brass fastener

either, further detracting from the original character of your home. This is to say nothing of the fact that once you are on the “replacement window” schedule, you can expect to have to replace the thermopanes once the gas escapes and the moisture infiltrates the unit resulting in a lovely “fogged window”.

I guess it is really not necessary for me to directly state my abhorence for vinyl windows, especially since the POs installed a couple of them. I can’t wait for a few of them to start “popping” so I have a reason beyond aesthetics to get rid of them and have custom antique sash windows installed.

Anyways, instead of replacing a wonderful old Queen Anne divided-top window with stained glass, I decided to repair it and have a custom milled storm window made by Hoffmeyer Mills located in Sebringville Ontario. The mill still uses the original machinery dating back to the 1870s. They told me that the storm was one of the largest made in recent memory at the mill and

Installed and in keeping with the look of the original windows

Installed and in keeping with the look of the original windows

their work, using traditional mortise and tenoned joinery, was excellent. Given the ambient noise of urban life, I requested that the window be glazed with 4 or 5 mm glass. The mill requested specific measurements and it only took a small number of runs with the hand planer to get a perfect fit. I used a simple compressible foam weatherstripping and antique styled brass fasteners and interior latch locks to hold the window in place. The result is no drafts whatsoever and I cannot even hear a delivery truck rolling by while reading the paper. Well worth it.

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