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Ask the Experts!

9 July 2008

“WINDOWS: I have 15 double hung windows in my 1906 home. I wish to remove the weights, insulate the cavities, have the sashes plowed and line the jambs on the old single pane windows. I also plan on installing new storm windows that actually fit the windows they should. I am hoping this will make a noticeable difference in comfort and heating bills. Do you think my plan is a worthwhile one in terms of comfort and energy savings?” – Tom

What did our experts say?

Yes, retrofitting the existing sashes is worthwhile in terms of comfort and energy savings.  The weight pockets should be filled with a spray foam insulation.  This can be done by drilling small holes in the jamb about every 4″.  Start at the bottom hole and inject foam until it starts coming out of the hole above it.  Continue this process until you reach the top.

Answer provided by Paul Morin, Senior Building Analyst at the Center for Energy and Environment.

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