Tuff-R instead of fiberglass......
yeah, that's true. boxes can be moved or extended, and window jambs
can be extended (often lumberyards will sell a stock molding called
parting stop that measures 1/2" by 3/4" which can be used to extend the
jambs), but that amounts to work too. if you work with a building
inspector, he'll doubtlessly have an opinion.
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