I'm looking at sunrise and a few other higher end names. However,I have a question on the install. The install is being done from the inside which is fine. The contractor said the new windows have a full perimeter foam wrap and the installer said it's very difficult to inject foam when their is a foam wrap on the window..is this true? If not, how cam foam be injected if there is a foam wrap? I guess he means there is not enough depth for the foam?