Well - these sound-proof windows are being put onto a home that is built out of concrete blocks with rebar and filled with cement. We will have insulation and then drywall put up. In MIL's house, the home is constructed the same way, but she does not have the sound-proof windows. We do not hear the airplanes except hubby says it is a very muffled sound. Thunder, we do not hear, only feel or the windows might shake. Come to think of it, we have not had a good thunderstorm since we got the new windows on her house last year. The windows we are getting are newly designed for airport traffic areas.