djenkins6 wrote:

Most of the winter it's ok but we get some condensation on inside of
walls on the very cold days, and the fact when we get a windy day the
side of the house receiving the winter wind stays cold. Would 1" foam
in the gap be enough to make the walls warm enough not to condense?
would filling the air gap cause problems - e.g trapping moisture and
actually make things worse by making somewhere for mold to grow and
stopping the wind drying the inside of the wall.

Can you build, or plant, a wind break on the outside?