Window air sealing
Hello! My insulation contractor used low expansion foam to insulate/air seal around the windows. He recessed the foam 2-3 inches from the inside. I am wondering, would it be a good idea to still install backer rod and caulk in the gap on the inside? Basically, would this be a wise way to improve the longevity of the air seal by doubling up, or might it cause a risk by creating a cavity between the foam and backer rod, should moisture manage to find a way in?
I am located in North Dakota in climate zone 6.
I would very much appreciate any advice!