[Greenbuilding] insulating around windows... best practice

[Reuben Deumling]

I like backer rod. My method has evolved into stuffing the appropriate
diameter backer rod from the outside and from the inside around the
perimeter of the window. Done carefully I convince myself that I'm creating
some dead air space in between the two foam layers.
Are there better ways of doing this?
I am aware of and used to use a foam gun. But I never can seem to make sure
to clean the gun when I'm done and so the next time I have to buy the
expensive acetone cleaner and take the damn thing apart again. Which is one
of the reasons I've switched to backer rod.

Thanks.
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