It is possible to nail window flanges over the foam if you are careful not to nail too deep and compress. Some builders use a wood shim directly behind the window flange.
If you are using brickmold on the windowsfor acasing, the load is spread out enough to not compress the foam. Brickmold is for bricks though. a Casing is better for Hardi, IMO.
In warm climates it is best to add this faom on the exterior, but in cold climates, it is best to use it on the interior side of the wall
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