Insulating void left by replacing pulley windows
I posted here a year ago about replacing original windows in a landmarked Brooklyn house:
https://www.greenbuildingadvisor.com/question/windows-that-reflect-infrared-only-when-its-hot
(btw, my old account has been corrupted somehow; I’d love to get some tech support)
A year later, we have closed, moved in, gotten permits, and fabrication has begun. The new windows are double-hung (the landmark commission won’t allow anything else) wood windows by Pella.
I asked my contractor (whom I love so far and seems very knowledgeable) about what will happen to the compartments within the frames that currently house the pulleys and weights. His response:
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I'm curious about the different approaches your builder plans for different floors, but it probably has to do with scope of work--removing finishes in some areas but not others, etc.. One-part canned foam is the standard these days for insulating the gap between windows and framing, but in an airtight cavity, fiberglass, mineral wool or other fluffy insulation would work just as well. Flashing tape will help make the cavity airtight. If they are using canned foam, everyone learns the hard way not to overfill the gap, or the expanding foam will bow the windows.